dashboard: CPU, memory, diskIO and traffic on the footer (#15950)

* dashboard: footer, deep state update * dashboard: resolve asset path * dashboard: prevent state update on every reconnection * dashboard: fix linter issue * dashboard, cmd: minor UI fix, include commit hash * dashboard: gitCommit renamed to commit * dashboard: move the geth version to the right, make commit optional * dashboard: memory, traffic and CPU on footer * dashboard: fix merge * dashboard: CPU, diskIO on footer * dashboard: rename variables, use group declaration * dashboard: docs
2018-01-23 22:51:04 +02:00
parent ec96216d16
commit 05ade19302
111 changed files with 13162 additions and 3158 deletions
--- a/vendor/github.com/elastic/gosigar/CHANGELOG.md
+++ b/vendor/github.com/elastic/gosigar/CHANGELOG.md
@ -0,0 +1,102 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+
+### Fixed
+
+### Changed
+
+### Deprecated
+
+## [0.8.0]
+
+### Added
+- Added partial `getrusage` support for Windows to retrieve system CPU time and user CPU time. #95
+- Added full `getrusage` support for Unix. #95
+
+## [0.7.0]
+
+### Added
+- Added method stubs for process handling for operating system that are not supported
+  by gosigar. All methods return `ErrNotImplemented` on such systems. #88
+
+### Fixed
+- Fix freebsd build by using the common version of Get(pid). #91
+
+### Changed
+- Fixed issues in cgroup package by adding missing error checks and closing
+  file handles. #92
+
+## [0.6.0]
+
+### Added
+- Added method stubs to enable compilation for operating systems that are not
+  supported by gosigar. All methods return `ErrNotImplemented` on these unsupported
+  operating systems. #83
+- FreeBSD returns `ErrNotImplemented` for `ProcTime.Get`. #83
+
+### Changed
+- OpenBSD returns `ErrNotImplemented` for `ProcTime.Get` instead of `nil`. #83
+- Fixed incorrect `Mem.Used` calculation under linux. #82
+- Fixed `ProcState` on Linux and FreeBSD when process names contain parentheses. #81
+
+### Removed
+- Remove NetBSD build from sigar_unix.go as it is not supported by gosigar. #83
+
+## [0.5.0]
+
+### Changed
+- Fixed Trim environment variables when comparing values in the test suite. #79
+- Make `kern_procargs` more robust under darwin when we cannot retrieve
+  all the information about a process. #78
+
+## [0.4.0]
+
+### Changed
+- Fixed Windows issue that caused a hang during `init()` if WMI wasn't ready. #74
+
+## [0.3.0]
+
+### Added
+- Read `MemAvailable` value for kernel 3.14+ #71
+
+## [0.2.0]
+
+### Added
+- Added `ErrCgroupsMissing` to indicate that /proc/cgroups is missing which is
+  an indicator that cgroups were disabled at compile time. #64
+
+### Changed
+- Changed `cgroup.SupportedSubsystems()` to honor the "enabled" column in the
+  /proc/cgroups file. #64
+
+## [0.1.0]
+
+### Added
+- Added `CpuList` implementation for Windows that returns CPU timing information
+  on a per CPU basis. #55
+- Added `Uptime` implementation for Windows. #55
+- Added `Swap` implementation for Windows based on page file metrics. #55
+- Added support to `github.com/gosigar/sys/windows` for querying and enabling
+  privileges in a process token.
+- Added utility code for interfacing with linux NETLINK_INET_DIAG. #60
+- Added `ProcEnv` for getting a process's environment variables. #61
+
+### Changed
+- Changed several `OpenProcess` calls on Windows to request the lowest possible
+  access privileges. #50
+- Removed cgo usage from Windows code.
+- Added OS version checks to `ProcArgs.Get` on Windows because the
+  `Win32_Process` WMI query is not available prior to Windows vista. On XP and
+  Windows 2003, this method returns `ErrNotImplemented`. #55
+
+### Fixed
+- Fixed value of `Mem.ActualFree` and `Mem.ActualUsed` on Windows. #49
+- Fixed `ProcTime.StartTime` on Windows to report value in milliseconds since
+  Unix epoch. #51
+- Fixed `ProcStatus.PPID` value is wrong on Windows. #55
+- Fixed `ProcStatus.Username` error on Windows XP #56
--- a/vendor/github.com/elastic/gosigar/LICENSE
+++ b/vendor/github.com/elastic/gosigar/LICENSE
@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+
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+   "Contribution" shall mean any work of authorship, including
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+   to that Work or Derivative Works thereof, that is intentionally
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+   communication on electronic mailing lists, source code control systems,
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+   "Contributor" shall mean Licensor and any individual or Legal Entity
+   on behalf of whom a Contribution has been received by Licensor and
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+   or contributory patent infringement, then any patent licenses
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+4. Redistribution. You may reproduce and distribute copies of the
+   Work or Derivative Works thereof in any medium, with or without
+   modifications, and in Source or Object form, provided that You
+   meet the following conditions:
+
+   (a) You must give any other recipients of the Work or
+       Derivative Works a copy of this License; and
+
+   (b) You must cause any modified files to carry prominent notices
+       stating that You changed the files; and
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+   (c) You must retain, in the Source form of any Derivative Works
+       that You distribute, all copyright, patent, trademark, and
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+       notices within Derivative Works that You distribute, alongside
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+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
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+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
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+   file or class name and description of purpose be included on the
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+limitations under the License.
--- a/vendor/github.com/elastic/gosigar/NOTICE
+++ b/vendor/github.com/elastic/gosigar/NOTICE
@ -0,0 +1,9 @@
+Copyright (c) [2009-2011] VMware, Inc. All Rights Reserved. 
+
+This product is licensed to you under the Apache License, Version 2.0 (the "License").  
+You may not use this product except in compliance with the License.  
+
+This product includes a number of subcomponents with
+separate copyright notices and license terms. Your use of these
+subcomponents is subject to the terms and conditions of the 
+subcomponent's license, as noted in the LICENSE file.
--- a/vendor/github.com/elastic/gosigar/README.md
+++ b/vendor/github.com/elastic/gosigar/README.md
@ -0,0 +1,57 @@
+# Go sigar [![Build Status](https://travis-ci.org/elastic/gosigar.svg?branch=master)](https://travis-ci.org/elastic/gosigar) [![Build status](https://ci.appveyor.com/api/projects/status/4yh6sa7u97ek5uib/branch/master?svg=true)](https://ci.appveyor.com/project/elastic-beats/gosigar/branch/master)
+
+
+## Overview
+
+Go sigar is a golang implementation of the
+[sigar API](https://github.com/hyperic/sigar).  The Go version of
+sigar has a very similar interface, but is being written from scratch
+in pure go/cgo, rather than cgo bindings for libsigar.
+
+## Test drive
+
+    $ go get github.com/elastic/gosigar
+    $ cd $GOPATH/src/github.com/elastic/gosigar/examples/ps
+    $ go build
+    $ ./ps
+
+## Supported platforms
+
+The features vary by operating system.
+
+| Feature         | Linux | Darwin | Windows | OpenBSD | FreeBSD |
+|-----------------|:-----:|:------:|:-------:|:-------:|:-------:|
+| Cpu             |   X   |    X   |    X    |    X    |    X    |
+| CpuList         |   X   |    X   |         |    X    |    X    |
+| FDUsage         |   X   |        |         |         |    X    |
+| FileSystemList  |   X   |    X   |    X    |    X    |    X    |
+| FileSystemUsage |   X   |    X   |    X    |    X    |    X    |
+| LoadAverage     |   X   |    X   |         |    X    |    X    |
+| Mem             |   X   |    X   |    X    |    X    |    X    |
+| ProcArgs        |   X   |    X   |    X    |         |    X    |
+| ProcEnv         |   X   |    X   |         |         |    X    |
+| ProcExe         |   X   |    X   |         |         |    X    |
+| ProcFDUsage     |   X   |        |         |         |    X    |
+| ProcList        |   X   |    X   |    X    |         |    X    |
+| ProcMem         |   X   |    X   |    X    |         |    X    |
+| ProcState       |   X   |    X   |    X    |         |    X    |
+| ProcTime        |   X   |    X   |    X    |         |    X    |
+| Swap            |   X   |    X   |         |    X    |    X    |
+| Uptime          |   X   |    X   |         |    X    |    X    |
+
+## OS Specific Notes
+
+### FreeBSD
+
+Mount both `linprocfs` and `procfs` for compatability. Consider adding these
+mounts to your `/etc/fstab` file so they are mounted automatically at boot.
+
+```
+sudo mount -t procfs proc /proc
+sudo mkdir -p /compat/linux/proc
+sudo mount -t linprocfs /dev/null /compat/linux/proc
+```
+
+## License
+
+Apache 2.0
--- a/vendor/github.com/elastic/gosigar/Vagrantfile
+++ b/vendor/github.com/elastic/gosigar/Vagrantfile
@ -0,0 +1,25 @@
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "hashicorp/precise64"
+  config.vm.provision "shell", inline: "mkdir -p /home/vagrant/go"
+  config.vm.synced_folder ".", "/home/vagrant/go/src/github.com/cloudfoundry/gosigar"
+  config.vm.provision "shell", inline: "chown -R vagrant:vagrant /home/vagrant/go"
+  install_go = <<-BASH
+  set -e
+
+if [ ! -d "/usr/local/go" ]; then
+	cd /tmp && wget https://storage.googleapis.com/golang/go1.3.3.linux-amd64.tar.gz
+	cd /usr/local
+	tar xvzf /tmp/go1.3.3.linux-amd64.tar.gz
+	echo 'export GOPATH=/home/vagrant/go; export PATH=/usr/local/go/bin:$PATH:$GOPATH/bin' >> /home/vagrant/.bashrc
+fi
+export GOPATH=/home/vagrant/go
+export PATH=/usr/local/go/bin:$PATH:$GOPATH/bin
+/usr/local/go/bin/go get -u github.com/onsi/ginkgo/ginkgo
+/usr/local/go/bin/go get -u github.com/onsi/gomega;
+BASH
+  config.vm.provision "shell", inline: 'apt-get install -y git-core'
+  config.vm.provision "shell", inline: install_go
+end
--- a/vendor/github.com/elastic/gosigar/codecov.yml
+++ b/vendor/github.com/elastic/gosigar/codecov.yml
@ -0,0 +1,21 @@
+# Enable coverage report message for diff on commit
+coverage:
+  status:
+    project: off
+    patch:
+      default:
+        # basic
+        target: auto
+        threshold: null
+        base: auto
+        # advanced
+        branches: null
+        if_no_uploads: error
+        if_not_found: success
+        if_ci_failed: error
+        only_pulls: false
+        flags: null
+        paths: null
+
+# Disable comments on Pull Requests
+comment: false
--- a/vendor/github.com/elastic/gosigar/concrete_sigar.go
+++ b/vendor/github.com/elastic/gosigar/concrete_sigar.go
@ -0,0 +1,83 @@
+package gosigar
+
+import (
+	"time"
+)
+
+type ConcreteSigar struct{}
+
+func (c *ConcreteSigar) CollectCpuStats(collectionInterval time.Duration) (<-chan Cpu, chan<- struct{}) {
+	// samplesCh is buffered to 1 value to immediately return first CPU sample
+	samplesCh := make(chan Cpu, 1)
+
+	stopCh := make(chan struct{})
+
+	go func() {
+		var cpuUsage Cpu
+
+		// Immediately provide non-delta value.
+		// samplesCh is buffered to 1 value, so it will not block.
+		cpuUsage.Get()
+		samplesCh <- cpuUsage
+
+		ticker := time.NewTicker(collectionInterval)
+
+		for {
+			select {
+			case <-ticker.C:
+				previousCpuUsage := cpuUsage
+
+				cpuUsage.Get()
+
+				select {
+				case samplesCh <- cpuUsage.Delta(previousCpuUsage):
+				default:
+					// Include default to avoid channel blocking
+				}
+
+			case <-stopCh:
+				return
+			}
+		}
+	}()
+
+	return samplesCh, stopCh
+}
+
+func (c *ConcreteSigar) GetLoadAverage() (LoadAverage, error) {
+	l := LoadAverage{}
+	err := l.Get()
+	return l, err
+}
+
+func (c *ConcreteSigar) GetMem() (Mem, error) {
+	m := Mem{}
+	err := m.Get()
+	return m, err
+}
+
+func (c *ConcreteSigar) GetSwap() (Swap, error) {
+	s := Swap{}
+	err := s.Get()
+	return s, err
+}
+
+func (c *ConcreteSigar) GetFileSystemUsage(path string) (FileSystemUsage, error) {
+	f := FileSystemUsage{}
+	err := f.Get(path)
+	return f, err
+}
+
+func (c *ConcreteSigar) GetFDUsage() (FDUsage, error) {
+	fd := FDUsage{}
+	err := fd.Get()
+	return fd, err
+}
+
+// GetRusage return the resource usage of the process
+// Possible params: 0 = RUSAGE_SELF, 1 = RUSAGE_CHILDREN, 2 = RUSAGE_THREAD
+func (c *ConcreteSigar) GetRusage(who int) (Rusage, error) {
+	r := Rusage{}
+	err := r.Get(who)
+	return r, err
+}
--- a/vendor/github.com/elastic/gosigar/sigar_darwin.go
+++ b/vendor/github.com/elastic/gosigar/sigar_darwin.go
@ -0,0 +1,494 @@
+// Copyright (c) 2012 VMware, Inc.
+
+package gosigar
+
+/*
+#include <stdlib.h>
+#include <sys/sysctl.h>
+#include <sys/mount.h>
+#include <mach/mach_init.h>
+#include <mach/mach_host.h>
+#include <mach/host_info.h>
+#include <libproc.h>
+#include <mach/processor_info.h>
+#include <mach/vm_map.h>
+*/
+import "C"
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"os/user"
+	"runtime"
+	"strconv"
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+func (self *LoadAverage) Get() error {
+	avg := []C.double{0, 0, 0}
+
+	C.getloadavg(&avg[0], C.int(len(avg)))
+
+	self.One = float64(avg[0])
+	self.Five = float64(avg[1])
+	self.Fifteen = float64(avg[2])
+
+	return nil
+}
+
+func (self *Uptime) Get() error {
+	tv := syscall.Timeval32{}
+
+	if err := sysctlbyname("kern.boottime", &tv); err != nil {
+		return err
+	}
+
+	self.Length = time.Since(time.Unix(int64(tv.Sec), int64(tv.Usec)*1000)).Seconds()
+
+	return nil
+}
+
+func (self *Mem) Get() error {
+	var vmstat C.vm_statistics_data_t
+
+	if err := sysctlbyname("hw.memsize", &self.Total); err != nil {
+		return err
+	}
+
+	if err := vm_info(&vmstat); err != nil {
+		return err
+	}
+
+	kern := uint64(vmstat.inactive_count) << 12
+	self.Free = uint64(vmstat.free_count) << 12
+
+	self.Used = self.Total - self.Free
+	self.ActualFree = self.Free + kern
+	self.ActualUsed = self.Used - kern
+
+	return nil
+}
+
+type xsw_usage struct {
+	Total, Avail, Used uint64
+}
+
+func (self *Swap) Get() error {
+	sw_usage := xsw_usage{}
+
+	if err := sysctlbyname("vm.swapusage", &sw_usage); err != nil {
+		return err
+	}
+
+	self.Total = sw_usage.Total
+	self.Used = sw_usage.Used
+	self.Free = sw_usage.Avail
+
+	return nil
+}
+
+func (self *Cpu) Get() error {
+	var count C.mach_msg_type_number_t = C.HOST_CPU_LOAD_INFO_COUNT
+	var cpuload C.host_cpu_load_info_data_t
+
+	status := C.host_statistics(C.host_t(C.mach_host_self()),
+		C.HOST_CPU_LOAD_INFO,
+		C.host_info_t(unsafe.Pointer(&cpuload)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return fmt.Errorf("host_statistics error=%d", status)
+	}
+
+	self.User = uint64(cpuload.cpu_ticks[C.CPU_STATE_USER])
+	self.Sys = uint64(cpuload.cpu_ticks[C.CPU_STATE_SYSTEM])
+	self.Idle = uint64(cpuload.cpu_ticks[C.CPU_STATE_IDLE])
+	self.Nice = uint64(cpuload.cpu_ticks[C.CPU_STATE_NICE])
+
+	return nil
+}
+
+func (self *CpuList) Get() error {
+	var count C.mach_msg_type_number_t
+	var cpuload *C.processor_cpu_load_info_data_t
+	var ncpu C.natural_t
+
+	status := C.host_processor_info(C.host_t(C.mach_host_self()),
+		C.PROCESSOR_CPU_LOAD_INFO,
+		&ncpu,
+		(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return fmt.Errorf("host_processor_info error=%d", status)
+	}
+
+	// jump through some cgo casting hoops and ensure we properly free
+	// the memory that cpuload points to
+	target := C.vm_map_t(C.mach_task_self_)
+	address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
+	defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))
+
+	// the body of struct processor_cpu_load_info
+	// aka processor_cpu_load_info_data_t
+	var cpu_ticks [C.CPU_STATE_MAX]uint32
+
+	// copy the cpuload array to a []byte buffer
+	// where we can binary.Read the data
+	size := int(ncpu) * binary.Size(cpu_ticks)
+	buf := C.GoBytes(unsafe.Pointer(cpuload), C.int(size))
+
+	bbuf := bytes.NewBuffer(buf)
+
+	self.List = make([]Cpu, 0, ncpu)
+
+	for i := 0; i < int(ncpu); i++ {
+		cpu := Cpu{}
+
+		err := binary.Read(bbuf, binary.LittleEndian, &cpu_ticks)
+		if err != nil {
+			return err
+		}
+
+		cpu.User = uint64(cpu_ticks[C.CPU_STATE_USER])
+		cpu.Sys = uint64(cpu_ticks[C.CPU_STATE_SYSTEM])
+		cpu.Idle = uint64(cpu_ticks[C.CPU_STATE_IDLE])
+		cpu.Nice = uint64(cpu_ticks[C.CPU_STATE_NICE])
+
+		self.List = append(self.List, cpu)
+	}
+
+	return nil
+}
+
+func (self *FDUsage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *FileSystemList) Get() error {
+	num, err := syscall.Getfsstat(nil, C.MNT_NOWAIT)
+	if err != nil {
+		return err
+	}
+
+	buf := make([]syscall.Statfs_t, num)
+
+	_, err = syscall.Getfsstat(buf, C.MNT_NOWAIT)
+	if err != nil {
+		return err
+	}
+
+	fslist := make([]FileSystem, 0, num)
+
+	for i := 0; i < num; i++ {
+		fs := FileSystem{}
+
+		fs.DirName = bytePtrToString(&buf[i].Mntonname[0])
+		fs.DevName = bytePtrToString(&buf[i].Mntfromname[0])
+		fs.SysTypeName = bytePtrToString(&buf[i].Fstypename[0])
+
+		fslist = append(fslist, fs)
+	}
+
+	self.List = fslist
+
+	return err
+}
+
+func (self *ProcList) Get() error {
+	n := C.proc_listpids(C.PROC_ALL_PIDS, 0, nil, 0)
+	if n <= 0 {
+		return syscall.EINVAL
+	}
+	buf := make([]byte, n)
+	n = C.proc_listpids(C.PROC_ALL_PIDS, 0, unsafe.Pointer(&buf[0]), n)
+	if n <= 0 {
+		return syscall.ENOMEM
+	}
+
+	var pid int32
+	num := int(n) / binary.Size(pid)
+	list := make([]int, 0, num)
+	bbuf := bytes.NewBuffer(buf)
+
+	for i := 0; i < num; i++ {
+		if err := binary.Read(bbuf, binary.LittleEndian, &pid); err != nil {
+			return err
+		}
+		if pid == 0 {
+			continue
+		}
+
+		list = append(list, int(pid))
+	}
+
+	self.List = list
+
+	return nil
+}
+
+func (self *ProcState) Get(pid int) error {
+	info := C.struct_proc_taskallinfo{}
+
+	if err := task_info(pid, &info); err != nil {
+		return err
+	}
+
+	self.Name = C.GoString(&info.pbsd.pbi_comm[0])
+
+	switch info.pbsd.pbi_status {
+	case C.SIDL:
+		self.State = RunStateIdle
+	case C.SRUN:
+		self.State = RunStateRun
+	case C.SSLEEP:
+		self.State = RunStateSleep
+	case C.SSTOP:
+		self.State = RunStateStop
+	case C.SZOMB:
+		self.State = RunStateZombie
+	default:
+		self.State = RunStateUnknown
+	}
+
+	self.Ppid = int(info.pbsd.pbi_ppid)
+
+	self.Pgid = int(info.pbsd.pbi_pgid)
+
+	self.Tty = int(info.pbsd.e_tdev)
+
+	self.Priority = int(info.ptinfo.pti_priority)
+
+	self.Nice = int(info.pbsd.pbi_nice)
+
+	// Get process username. Fallback to UID if username is not available.
+	uid := strconv.Itoa(int(info.pbsd.pbi_uid))
+	user, err := user.LookupId(uid)
+	if err == nil && user.Username != "" {
+		self.Username = user.Username
+	} else {
+		self.Username = uid
+	}
+
+	return nil
+}
+
+func (self *ProcMem) Get(pid int) error {
+	info := C.struct_proc_taskallinfo{}
+
+	if err := task_info(pid, &info); err != nil {
+		return err
+	}
+
+	self.Size = uint64(info.ptinfo.pti_virtual_size)
+	self.Resident = uint64(info.ptinfo.pti_resident_size)
+	self.PageFaults = uint64(info.ptinfo.pti_faults)
+
+	return nil
+}
+
+func (self *ProcTime) Get(pid int) error {
+	info := C.struct_proc_taskallinfo{}
+
+	if err := task_info(pid, &info); err != nil {
+		return err
+	}
+
+	self.User =
+		uint64(info.ptinfo.pti_total_user) / uint64(time.Millisecond)
+
+	self.Sys =
+		uint64(info.ptinfo.pti_total_system) / uint64(time.Millisecond)
+
+	self.Total = self.User + self.Sys
+
+	self.StartTime = (uint64(info.pbsd.pbi_start_tvsec) * 1000) +
+		(uint64(info.pbsd.pbi_start_tvusec) / 1000)
+
+	return nil
+}
+
+func (self *ProcArgs) Get(pid int) error {
+	var args []string
+
+	argv := func(arg string) {
+		args = append(args, arg)
+	}
+
+	err := kern_procargs(pid, nil, argv, nil)
+
+	self.List = args
+
+	return err
+}
+
+func (self *ProcEnv) Get(pid int) error {
+	if self.Vars == nil {
+		self.Vars = map[string]string{}
+	}
+
+	env := func(k, v string) {
+		self.Vars[k] = v
+	}
+
+	return kern_procargs(pid, nil, nil, env)
+}
+
+func (self *ProcExe) Get(pid int) error {
+	exe := func(arg string) {
+		self.Name = arg
+	}
+
+	return kern_procargs(pid, exe, nil, nil)
+}
+
+func (self *ProcFDUsage) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+// wrapper around sysctl KERN_PROCARGS2
+// callbacks params are optional,
+// up to the caller as to which pieces of data they want
+func kern_procargs(pid int,
+	exe func(string),
+	argv func(string),
+	env func(string, string)) error {
+
+	mib := []C.int{C.CTL_KERN, C.KERN_PROCARGS2, C.int(pid)}
+	argmax := uintptr(C.ARG_MAX)
+	buf := make([]byte, argmax)
+	err := sysctl(mib, &buf[0], &argmax, nil, 0)
+	if err != nil {
+		return nil
+	}
+
+	bbuf := bytes.NewBuffer(buf)
+	bbuf.Truncate(int(argmax))
+
+	var argc int32
+	binary.Read(bbuf, binary.LittleEndian, &argc)
+
+	path, err := bbuf.ReadBytes(0)
+	if err != nil {
+		return fmt.Errorf("Error reading the argv[0]: %v", err)
+	}
+	if exe != nil {
+		exe(string(chop(path)))
+	}
+
+	// skip trailing \0's
+	for {
+		c, err := bbuf.ReadByte()
+		if err != nil {
+			return fmt.Errorf("Error skipping nils: %v", err)
+		}
+		if c != 0 {
+			bbuf.UnreadByte()
+			break // start of argv[0]
+		}
+	}
+
+	for i := 0; i < int(argc); i++ {
+		arg, err := bbuf.ReadBytes(0)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return fmt.Errorf("Error reading args: %v", err)
+		}
+		if argv != nil {
+			argv(string(chop(arg)))
+		}
+	}
+
+	if env == nil {
+		return nil
+	}
+
+	delim := []byte{61} // "="
+
+	for {
+		line, err := bbuf.ReadBytes(0)
+		if err == io.EOF || line[0] == 0 {
+			break
+		}
+		if err != nil {
+			return fmt.Errorf("Error reading args: %v", err)
+		}
+		pair := bytes.SplitN(chop(line), delim, 2)
+
+		if len(pair) != 2 {
+			return fmt.Errorf("Error reading process information for PID: %d", pid)
+		}
+
+		env(string(pair[0]), string(pair[1]))
+	}
+
+	return nil
+}
+
+// XXX copied from zsyscall_darwin_amd64.go
+func sysctl(mib []C.int, old *byte, oldlen *uintptr,
+	new *byte, newlen uintptr) (err error) {
+	var p0 unsafe.Pointer
+	p0 = unsafe.Pointer(&mib[0])
+	_, _, e1 := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(p0),
+		uintptr(len(mib)),
+		uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)),
+		uintptr(unsafe.Pointer(new)), uintptr(newlen))
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+func vm_info(vmstat *C.vm_statistics_data_t) error {
+	var count C.mach_msg_type_number_t = C.HOST_VM_INFO_COUNT
+
+	status := C.host_statistics(
+		C.host_t(C.mach_host_self()),
+		C.HOST_VM_INFO,
+		C.host_info_t(unsafe.Pointer(vmstat)),
+		&count)
+
+	if status != C.KERN_SUCCESS {
+		return fmt.Errorf("host_statistics=%d", status)
+	}
+
+	return nil
+}
+
+// generic Sysctl buffer unmarshalling
+func sysctlbyname(name string, data interface{}) (err error) {
+	val, err := syscall.Sysctl(name)
+	if err != nil {
+		return err
+	}
+
+	buf := []byte(val)
+
+	switch v := data.(type) {
+	case *uint64:
+		*v = *(*uint64)(unsafe.Pointer(&buf[0]))
+		return
+	}
+
+	bbuf := bytes.NewBuffer([]byte(val))
+	return binary.Read(bbuf, binary.LittleEndian, data)
+}
+
+func task_info(pid int, info *C.struct_proc_taskallinfo) error {
+	size := C.int(unsafe.Sizeof(*info))
+	ptr := unsafe.Pointer(info)
+
+	n := C.proc_pidinfo(C.int(pid), C.PROC_PIDTASKALLINFO, 0, ptr, size)
+	if n != size {
+		return fmt.Errorf("Could not read process info for pid %d", pid)
+	}
+
+	return nil
+}
--- a/vendor/github.com/elastic/gosigar/sigar_format.go
+++ b/vendor/github.com/elastic/gosigar/sigar_format.go
@ -0,0 +1,126 @@
+// Copyright (c) 2012 VMware, Inc.
+
+package gosigar
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"strconv"
+	"time"
+)
+
+// Go version of apr_strfsize
+func FormatSize(size uint64) string {
+	ord := []string{"K", "M", "G", "T", "P", "E"}
+	o := 0
+	buf := new(bytes.Buffer)
+	w := bufio.NewWriter(buf)
+
+	if size < 973 {
+		fmt.Fprintf(w, "%3d ", size)
+		w.Flush()
+		return buf.String()
+	}
+
+	for {
+		remain := size & 1023
+		size >>= 10
+
+		if size >= 973 {
+			o++
+			continue
+		}
+
+		if size < 9 || (size == 9 && remain < 973) {
+			remain = ((remain * 5) + 256) / 512
+			if remain >= 10 {
+				size++
+				remain = 0
+			}
+
+			fmt.Fprintf(w, "%d.%d%s", size, remain, ord[o])
+			break
+		}
+
+		if remain >= 512 {
+			size++
+		}
+
+		fmt.Fprintf(w, "%3d%s", size, ord[o])
+		break
+	}
+
+	w.Flush()
+	return buf.String()
+}
+
+func FormatPercent(percent float64) string {
+	return strconv.FormatFloat(percent, 'f', -1, 64) + "%"
+}
+
+func (self *FileSystemUsage) UsePercent() float64 {
+	b_used := (self.Total - self.Free) / 1024
+	b_avail := self.Avail / 1024
+	utotal := b_used + b_avail
+	used := b_used
+
+	if utotal != 0 {
+		u100 := used * 100
+		pct := u100 / utotal
+		if u100%utotal != 0 {
+			pct += 1
+		}
+		return (float64(pct) / float64(100)) * 100.0
+	}
+
+	return 0.0
+}
+
+func (self *Uptime) Format() string {
+	buf := new(bytes.Buffer)
+	w := bufio.NewWriter(buf)
+	uptime := uint64(self.Length)
+
+	days := uptime / (60 * 60 * 24)
+
+	if days != 0 {
+		s := ""
+		if days > 1 {
+			s = "s"
+		}
+		fmt.Fprintf(w, "%d day%s, ", days, s)
+	}
+
+	minutes := uptime / 60
+	hours := minutes / 60
+	hours %= 24
+	minutes %= 60
+
+	fmt.Fprintf(w, "%2d:%02d", hours, minutes)
+
+	w.Flush()
+	return buf.String()
+}
+
+func (self *ProcTime) FormatStartTime() string {
+	if self.StartTime == 0 {
+		return "00:00"
+	}
+	start := time.Unix(int64(self.StartTime)/1000, 0)
+	format := "Jan02"
+	if time.Since(start).Seconds() < (60 * 60 * 24) {
+		format = "15:04"
+	}
+	return start.Format(format)
+}
+
+func (self *ProcTime) FormatTotal() string {
+	t := self.Total / 1000
+	ss := t % 60
+	t /= 60
+	mm := t % 60
+	t /= 60
+	hh := t % 24
+	return fmt.Sprintf("%02d:%02d:%02d", hh, mm, ss)
+}
--- a/vendor/github.com/elastic/gosigar/sigar_freebsd.go
+++ b/vendor/github.com/elastic/gosigar/sigar_freebsd.go
@ -0,0 +1,108 @@
+// Copied and modified from sigar_linux.go.
+
+package gosigar
+
+import (
+	"io/ioutil"
+	"strconv"
+	"strings"
+	"unsafe"
+)
+
+/*
+#include <sys/param.h>
+#include <sys/mount.h>
+#include <sys/ucred.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <time.h>
+*/
+import "C"
+
+func init() {
+	system.ticks = uint64(C.sysconf(C._SC_CLK_TCK))
+
+	Procd = "/compat/linux/proc"
+
+	getLinuxBootTime()
+}
+
+func getMountTableFileName() string {
+	return Procd + "/mtab"
+}
+
+func (self *Uptime) Get() error {
+	ts := C.struct_timespec{}
+
+	if _, err := C.clock_gettime(C.CLOCK_UPTIME, &ts); err != nil {
+		return err
+	}
+
+	self.Length = float64(ts.tv_sec) + 1e-9*float64(ts.tv_nsec)
+
+	return nil
+}
+
+func (self *FDUsage) Get() error {
+	val := C.uint32_t(0)
+	sc := C.size_t(4)
+
+	name := C.CString("kern.openfiles")
+	_, err := C.sysctlbyname(name, unsafe.Pointer(&val), &sc, nil, 0)
+	C.free(unsafe.Pointer(name))
+	if err != nil {
+		return err
+	}
+	self.Open = uint64(val)
+
+	name = C.CString("kern.maxfiles")
+	_, err = C.sysctlbyname(name, unsafe.Pointer(&val), &sc, nil, 0)
+	C.free(unsafe.Pointer(name))
+	if err != nil {
+		return err
+	}
+	self.Max = uint64(val)
+
+	self.Unused = self.Max - self.Open
+
+	return nil
+}
+
+func (self *ProcFDUsage) Get(pid int) error {
+	err := readFile("/proc/"+strconv.Itoa(pid)+"/rlimit", func(line string) bool {
+		if strings.HasPrefix(line, "nofile") {
+			fields := strings.Fields(line)
+			if len(fields) == 3 {
+				self.SoftLimit, _ = strconv.ParseUint(fields[1], 10, 64)
+				self.HardLimit, _ = strconv.ParseUint(fields[2], 10, 64)
+			}
+			return false
+		}
+		return true
+	})
+	if err != nil {
+		return err
+	}
+
+	// linprocfs only provides this information for this process (self).
+	fds, err := ioutil.ReadDir(procFileName(pid, "fd"))
+	if err != nil {
+		return err
+	}
+	self.Open = uint64(len(fds))
+
+	return nil
+}
+
+func parseCpuStat(self *Cpu, line string) error {
+	fields := strings.Fields(line)
+
+	self.User, _ = strtoull(fields[1])
+	self.Nice, _ = strtoull(fields[2])
+	self.Sys, _ = strtoull(fields[3])
+	self.Idle, _ = strtoull(fields[4])
+	return nil
+}
--- a/vendor/github.com/elastic/gosigar/sigar_interface.go
+++ b/vendor/github.com/elastic/gosigar/sigar_interface.go
@ -0,0 +1,197 @@
+package gosigar
+
+import (
+	"time"
+)
+
+type ErrNotImplemented struct {
+	OS string
+}
+
+func (e ErrNotImplemented) Error() string {
+	return "not implemented on " + e.OS
+}
+
+func IsNotImplemented(err error) bool {
+	switch err.(type) {
+	case ErrNotImplemented, *ErrNotImplemented:
+		return true
+	default:
+		return false
+	}
+}
+
+type Sigar interface {
+	CollectCpuStats(collectionInterval time.Duration) (<-chan Cpu, chan<- struct{})
+	GetLoadAverage() (LoadAverage, error)
+	GetMem() (Mem, error)
+	GetSwap() (Swap, error)
+	GetFileSystemUsage(string) (FileSystemUsage, error)
+	GetFDUsage() (FDUsage, error)
+	GetRusage(who int) (Rusage, error)
+}
+
+type Cpu struct {
+	User    uint64
+	Nice    uint64
+	Sys     uint64
+	Idle    uint64
+	Wait    uint64
+	Irq     uint64
+	SoftIrq uint64
+	Stolen  uint64
+}
+
+func (cpu *Cpu) Total() uint64 {
+	return cpu.User + cpu.Nice + cpu.Sys + cpu.Idle +
+		cpu.Wait + cpu.Irq + cpu.SoftIrq + cpu.Stolen
+}
+
+func (cpu Cpu) Delta(other Cpu) Cpu {
+	return Cpu{
+		User:    cpu.User - other.User,
+		Nice:    cpu.Nice - other.Nice,
+		Sys:     cpu.Sys - other.Sys,
+		Idle:    cpu.Idle - other.Idle,
+		Wait:    cpu.Wait - other.Wait,
+		Irq:     cpu.Irq - other.Irq,
+		SoftIrq: cpu.SoftIrq - other.SoftIrq,
+		Stolen:  cpu.Stolen - other.Stolen,
+	}
+}
+
+type LoadAverage struct {
+	One, Five, Fifteen float64
+}
+
+type Uptime struct {
+	Length float64
+}
+
+type Mem struct {
+	Total      uint64
+	Used       uint64
+	Free       uint64
+	ActualFree uint64
+	ActualUsed uint64
+}
+
+type Swap struct {
+	Total uint64
+	Used  uint64
+	Free  uint64
+}
+
+type CpuList struct {
+	List []Cpu
+}
+
+type FDUsage struct {
+	Open   uint64
+	Unused uint64
+	Max    uint64
+}
+
+type FileSystem struct {
+	DirName     string
+	DevName     string
+	TypeName    string
+	SysTypeName string
+	Options     string
+	Flags       uint32
+}
+
+type FileSystemList struct {
+	List []FileSystem
+}
+
+type FileSystemUsage struct {
+	Total     uint64
+	Used      uint64
+	Free      uint64
+	Avail     uint64
+	Files     uint64
+	FreeFiles uint64
+}
+
+type ProcList struct {
+	List []int
+}
+
+type RunState byte
+
+const (
+	RunStateSleep   = 'S'
+	RunStateRun     = 'R'
+	RunStateStop    = 'T'
+	RunStateZombie  = 'Z'
+	RunStateIdle    = 'D'
+	RunStateUnknown = '?'
+)
+
+type ProcState struct {
+	Name      string
+	Username  string
+	State     RunState
+	Ppid      int
+	Pgid      int
+	Tty       int
+	Priority  int
+	Nice      int
+	Processor int
+}
+
+type ProcMem struct {
+	Size        uint64
+	Resident    uint64
+	Share       uint64
+	MinorFaults uint64
+	MajorFaults uint64
+	PageFaults  uint64
+}
+
+type ProcTime struct {
+	StartTime uint64
+	User      uint64
+	Sys       uint64
+	Total     uint64
+}
+
+type ProcArgs struct {
+	List []string
+}
+
+type ProcEnv struct {
+	Vars map[string]string
+}
+
+type ProcExe struct {
+	Name string
+	Cwd  string
+	Root string
+}
+
+type ProcFDUsage struct {
+	Open      uint64
+	SoftLimit uint64
+	HardLimit uint64
+}
+
+type Rusage struct {
+	Utime    time.Duration
+	Stime    time.Duration
+	Maxrss   int64
+	Ixrss    int64
+	Idrss    int64
+	Isrss    int64
+	Minflt   int64
+	Majflt   int64
+	Nswap    int64
+	Inblock  int64
+	Oublock  int64
+	Msgsnd   int64
+	Msgrcv   int64
+	Nsignals int64
+	Nvcsw    int64
+	Nivcsw   int64
+}
--- a/vendor/github.com/elastic/gosigar/sigar_linux.go
+++ b/vendor/github.com/elastic/gosigar/sigar_linux.go
@ -0,0 +1,84 @@
+// Copyright (c) 2012 VMware, Inc.
+
+package gosigar
+
+import (
+	"io/ioutil"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+func init() {
+	system.ticks = 100 // C.sysconf(C._SC_CLK_TCK)
+
+	Procd = "/proc"
+
+	getLinuxBootTime()
+}
+
+func getMountTableFileName() string {
+	return "/etc/mtab"
+}
+
+func (self *Uptime) Get() error {
+	sysinfo := syscall.Sysinfo_t{}
+
+	if err := syscall.Sysinfo(&sysinfo); err != nil {
+		return err
+	}
+
+	self.Length = float64(sysinfo.Uptime)
+
+	return nil
+}
+
+func (self *FDUsage) Get() error {
+	return readFile(Procd+"/sys/fs/file-nr", func(line string) bool {
+		fields := strings.Fields(line)
+		if len(fields) == 3 {
+			self.Open, _ = strconv.ParseUint(fields[0], 10, 64)
+			self.Unused, _ = strconv.ParseUint(fields[1], 10, 64)
+			self.Max, _ = strconv.ParseUint(fields[2], 10, 64)
+		}
+		return false
+	})
+}
+
+func (self *ProcFDUsage) Get(pid int) error {
+	err := readFile(procFileName(pid, "limits"), func(line string) bool {
+		if strings.HasPrefix(line, "Max open files") {
+			fields := strings.Fields(line)
+			if len(fields) == 6 {
+				self.SoftLimit, _ = strconv.ParseUint(fields[3], 10, 64)
+				self.HardLimit, _ = strconv.ParseUint(fields[4], 10, 64)
+			}
+			return false
+		}
+		return true
+	})
+	if err != nil {
+		return err
+	}
+	fds, err := ioutil.ReadDir(procFileName(pid, "fd"))
+	if err != nil {
+		return err
+	}
+	self.Open = uint64(len(fds))
+	return nil
+}
+
+func parseCpuStat(self *Cpu, line string) error {
+	fields := strings.Fields(line)
+
+	self.User, _ = strtoull(fields[1])
+	self.Nice, _ = strtoull(fields[2])
+	self.Sys, _ = strtoull(fields[3])
+	self.Idle, _ = strtoull(fields[4])
+	self.Wait, _ = strtoull(fields[5])
+	self.Irq, _ = strtoull(fields[6])
+	self.SoftIrq, _ = strtoull(fields[7])
+	self.Stolen, _ = strtoull(fields[8])
+
+	return nil
+}
--- a/vendor/github.com/elastic/gosigar/sigar_linux_common.go
+++ b/vendor/github.com/elastic/gosigar/sigar_linux_common.go
@ -0,0 +1,468 @@
+// Copyright (c) 2012 VMware, Inc.
+
+// +build freebsd linux
+
+package gosigar
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+var system struct {
+	ticks uint64
+	btime uint64
+}
+
+var Procd string
+
+func getLinuxBootTime() {
+	// grab system boot time
+	readFile(Procd+"/stat", func(line string) bool {
+		if strings.HasPrefix(line, "btime") {
+			system.btime, _ = strtoull(line[6:])
+			return false // stop reading
+		}
+		return true
+	})
+}
+
+func (self *LoadAverage) Get() error {
+	line, err := ioutil.ReadFile(Procd + "/loadavg")
+	if err != nil {
+		return nil
+	}
+
+	fields := strings.Fields(string(line))
+
+	self.One, _ = strconv.ParseFloat(fields[0], 64)
+	self.Five, _ = strconv.ParseFloat(fields[1], 64)
+	self.Fifteen, _ = strconv.ParseFloat(fields[2], 64)
+
+	return nil
+}
+
+func (self *Mem) Get() error {
+
+	table, err := parseMeminfo()
+	if err != nil {
+		return err
+	}
+
+	self.Total, _ = table["MemTotal"]
+	self.Free, _ = table["MemFree"]
+	buffers, _ := table["Buffers"]
+	cached, _ := table["Cached"]
+
+	if available, ok := table["MemAvailable"]; ok {
+		// MemAvailable is in /proc/meminfo (kernel 3.14+)
+		self.ActualFree = available
+	} else {
+		self.ActualFree = self.Free + buffers + cached
+	}
+
+	self.Used = self.Total - self.Free
+	self.ActualUsed = self.Total - self.ActualFree
+
+	return nil
+}
+
+func (self *Swap) Get() error {
+
+	table, err := parseMeminfo()
+	if err != nil {
+		return err
+	}
+	self.Total, _ = table["SwapTotal"]
+	self.Free, _ = table["SwapFree"]
+
+	self.Used = self.Total - self.Free
+	return nil
+}
+
+func (self *Cpu) Get() error {
+	return readFile(Procd+"/stat", func(line string) bool {
+		if len(line) > 4 && line[0:4] == "cpu " {
+			parseCpuStat(self, line)
+			return false
+		}
+		return true
+
+	})
+}
+
+func (self *CpuList) Get() error {
+	capacity := len(self.List)
+	if capacity == 0 {
+		capacity = 4
+	}
+	list := make([]Cpu, 0, capacity)
+
+	err := readFile(Procd+"/stat", func(line string) bool {
+		if len(line) > 3 && line[0:3] == "cpu" && line[3] != ' ' {
+			cpu := Cpu{}
+			parseCpuStat(&cpu, line)
+			list = append(list, cpu)
+		}
+		return true
+	})
+
+	self.List = list
+
+	return err
+}
+
+func (self *FileSystemList) Get() error {
+	capacity := len(self.List)
+	if capacity == 0 {
+		capacity = 10
+	}
+	fslist := make([]FileSystem, 0, capacity)
+
+	err := readFile(getMountTableFileName(), func(line string) bool {
+		fields := strings.Fields(line)
+
+		fs := FileSystem{}
+		fs.DevName = fields[0]
+		fs.DirName = fields[1]
+		fs.SysTypeName = fields[2]
+		fs.Options = fields[3]
+
+		fslist = append(fslist, fs)
+
+		return true
+	})
+
+	self.List = fslist
+
+	return err
+}
+
+func (self *ProcList) Get() error {
+	dir, err := os.Open(Procd)
+	if err != nil {
+		return err
+	}
+	defer dir.Close()
+
+	const readAllDirnames = -1 // see os.File.Readdirnames doc
+
+	names, err := dir.Readdirnames(readAllDirnames)
+	if err != nil {
+		return err
+	}
+
+	capacity := len(names)
+	list := make([]int, 0, capacity)
+
+	for _, name := range names {
+		if name[0] < '0' || name[0] > '9' {
+			continue
+		}
+		pid, err := strconv.Atoi(name)
+		if err == nil {
+			list = append(list, pid)
+		}
+	}
+
+	self.List = list
+
+	return nil
+}
+
+func (self *ProcState) Get(pid int) error {
+	data, err := readProcFile(pid, "stat")
+	if err != nil {
+		return err
+	}
+
+	// Extract the comm value with is surrounded by parentheses.
+	lIdx := bytes.Index(data, []byte("("))
+	rIdx := bytes.LastIndex(data, []byte(")"))
+	if lIdx < 0 || rIdx < 0 || lIdx >= rIdx || rIdx+2 >= len(data) {
+		return fmt.Errorf("failed to extract comm for pid %d from '%v'", pid, string(data))
+	}
+	self.Name = string(data[lIdx+1 : rIdx])
+
+	// Extract the rest of the fields that we are interested in.
+	fields := bytes.Fields(data[rIdx+2:])
+	if len(fields) <= 36 {
+		return fmt.Errorf("expected more stat fields for pid %d from '%v'", pid, string(data))
+	}
+
+	interests := bytes.Join([][]byte{
+		fields[0],  // state
+		fields[1],  // ppid
+		fields[2],  // pgrp
+		fields[4],  // tty_nr
+		fields[15], // priority
+		fields[16], // nice
+		fields[36], // processor (last processor executed on)
+	}, []byte(" "))
+
+	var state string
+	_, err = fmt.Fscan(bytes.NewBuffer(interests),
+		&state,
+		&self.Ppid,
+		&self.Pgid,
+		&self.Tty,
+		&self.Priority,
+		&self.Nice,
+		&self.Processor,
+	)
+	if err != nil {
+		return fmt.Errorf("failed to parse stat fields for pid %d from '%v': %v", pid, string(data), err)
+	}
+	self.State = RunState(state[0])
+
+	// Read /proc/[pid]/status to get the uid, then lookup uid to get username.
+	status, err := getProcStatus(pid)
+	if err != nil {
+		return fmt.Errorf("failed to read process status for pid %d: %v", pid, err)
+	}
+	uids, err := getUIDs(status)
+	if err != nil {
+		return fmt.Errorf("failed to read process status for pid %d: %v", pid, err)
+	}
+	user, err := user.LookupId(uids[0])
+	if err == nil {
+		self.Username = user.Username
+	} else {
+		self.Username = uids[0]
+	}
+
+	return nil
+}
+
+func (self *ProcMem) Get(pid int) error {
+	contents, err := readProcFile(pid, "statm")
+	if err != nil {
+		return err
+	}
+
+	fields := strings.Fields(string(contents))
+
+	size, _ := strtoull(fields[0])
+	self.Size = size << 12
+
+	rss, _ := strtoull(fields[1])
+	self.Resident = rss << 12
+
+	share, _ := strtoull(fields[2])
+	self.Share = share << 12
+
+	contents, err = readProcFile(pid, "stat")
+	if err != nil {
+		return err
+	}
+
+	fields = strings.Fields(string(contents))
+
+	self.MinorFaults, _ = strtoull(fields[10])
+	self.MajorFaults, _ = strtoull(fields[12])
+	self.PageFaults = self.MinorFaults + self.MajorFaults
+
+	return nil
+}
+
+func (self *ProcTime) Get(pid int) error {
+	contents, err := readProcFile(pid, "stat")
+	if err != nil {
+		return err
+	}
+
+	fields := strings.Fields(string(contents))
+
+	user, _ := strtoull(fields[13])
+	sys, _ := strtoull(fields[14])
+	// convert to millis
+	self.User = user * (1000 / system.ticks)
+	self.Sys = sys * (1000 / system.ticks)
+	self.Total = self.User + self.Sys
+
+	// convert to millis
+	self.StartTime, _ = strtoull(fields[21])
+	self.StartTime /= system.ticks
+	self.StartTime += system.btime
+	self.StartTime *= 1000
+
+	return nil
+}
+
+func (self *ProcArgs) Get(pid int) error {
+	contents, err := readProcFile(pid, "cmdline")
+	if err != nil {
+		return err
+	}
+
+	bbuf := bytes.NewBuffer(contents)
+
+	var args []string
+
+	for {
+		arg, err := bbuf.ReadBytes(0)
+		if err == io.EOF {
+			break
+		}
+		args = append(args, string(chop(arg)))
+	}
+
+	self.List = args
+
+	return nil
+}
+
+func (self *ProcEnv) Get(pid int) error {
+	contents, err := readProcFile(pid, "environ")
+	if err != nil {
+		return err
+	}
+
+	if self.Vars == nil {
+		self.Vars = map[string]string{}
+	}
+
+	pairs := bytes.Split(contents, []byte{0})
+	for _, kv := range pairs {
+		parts := bytes.SplitN(kv, []byte{'='}, 2)
+		if len(parts) != 2 {
+			continue
+		}
+
+		key := string(bytes.TrimSpace(parts[0]))
+		if key == "" {
+			continue
+		}
+
+		self.Vars[key] = string(bytes.TrimSpace(parts[1]))
+	}
+
+	return nil
+}
+
+func (self *ProcExe) Get(pid int) error {
+	fields := map[string]*string{
+		"exe":  &self.Name,
+		"cwd":  &self.Cwd,
+		"root": &self.Root,
+	}
+
+	for name, field := range fields {
+		val, err := os.Readlink(procFileName(pid, name))
+
+		if err != nil {
+			return err
+		}
+
+		*field = val
+	}
+
+	return nil
+}
+
+func parseMeminfo() (map[string]uint64, error) {
+	table := map[string]uint64{}
+
+	err := readFile(Procd+"/meminfo", func(line string) bool {
+		fields := strings.Split(line, ":")
+
+		if len(fields) != 2 {
+			return true // skip on errors
+		}
+
+		num := strings.TrimLeft(fields[1], " ")
+		val, err := strtoull(strings.Fields(num)[0])
+		if err != nil {
+			return true // skip on errors
+		}
+		table[fields[0]] = val * 1024 //in bytes
+
+		return true
+	})
+	return table, err
+}
+
+func readFile(file string, handler func(string) bool) error {
+	contents, err := ioutil.ReadFile(file)
+	if err != nil {
+		return err
+	}
+
+	reader := bufio.NewReader(bytes.NewBuffer(contents))
+
+	for {
+		line, _, err := reader.ReadLine()
+		if err == io.EOF {
+			break
+		}
+		if !handler(string(line)) {
+			break
+		}
+	}
+
+	return nil
+}
+
+func strtoull(val string) (uint64, error) {
+	return strconv.ParseUint(val, 10, 64)
+}
+
+func procFileName(pid int, name string) string {
+	return Procd + "/" + strconv.Itoa(pid) + "/" + name
+}
+
+func readProcFile(pid int, name string) ([]byte, error) {
+	path := procFileName(pid, name)
+	contents, err := ioutil.ReadFile(path)
+
+	if err != nil {
+		if perr, ok := err.(*os.PathError); ok {
+			if perr.Err == syscall.ENOENT {
+				return nil, syscall.ESRCH
+			}
+		}
+	}
+
+	return contents, err
+}
+
+// getProcStatus reads /proc/[pid]/status which contains process status
+// information in human readable form.
+func getProcStatus(pid int) (map[string]string, error) {
+	status := make(map[string]string, 42)
+	path := filepath.Join(Procd, strconv.Itoa(pid), "status")
+	err := readFile(path, func(line string) bool {
+		fields := strings.SplitN(line, ":", 2)
+		if len(fields) == 2 {
+			status[fields[0]] = strings.TrimSpace(fields[1])
+		}
+
+		return true
+	})
+	return status, err
+}
+
+// getUIDs reads the "Uid" value from status and splits it into four values --
+// real, effective, saved set, and  file system UIDs.
+func getUIDs(status map[string]string) ([]string, error) {
+	uidLine, ok := status["Uid"]
+	if !ok {
+		return nil, fmt.Errorf("Uid not found in proc status")
+	}
+
+	uidStrs := strings.Fields(uidLine)
+	if len(uidStrs) != 4 {
+		return nil, fmt.Errorf("Uid line ('%s') did not contain four values", uidLine)
+	}
+
+	return uidStrs, nil
+}
--- a/vendor/github.com/elastic/gosigar/sigar_openbsd.go
+++ b/vendor/github.com/elastic/gosigar/sigar_openbsd.go
@ -0,0 +1,418 @@
+// Copyright (c) 2016 Jasper Lievisse Adriaanse <j@jasper.la>.
+
+// +build openbsd
+
+package gosigar
+
+/*
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/mount.h>
+#include <sys/sched.h>
+#include <sys/swap.h>
+#include <stdlib.h>
+#include <unistd.h>
+*/
+import "C"
+
+//import "github.com/davecgh/go-spew/spew"
+
+import (
+	"runtime"
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+type Uvmexp struct {
+	pagesize           uint32
+	pagemask           uint32
+	pageshift          uint32
+	npages             uint32
+	free               uint32
+	active             uint32
+	inactive           uint32
+	paging             uint32
+	wired              uint32
+	zeropages          uint32
+	reserve_pagedaemon uint32
+	reserve_kernel     uint32
+	anonpages          uint32
+	vnodepages         uint32
+	vtextpages         uint32
+	freemin            uint32
+	freetarg           uint32
+	inactarg           uint32
+	wiredmax           uint32
+	anonmin            uint32
+	vtextmin           uint32
+	vnodemin           uint32
+	anonminpct         uint32
+	vtextmi            uint32
+	npct               uint32
+	vnodeminpct        uint32
+	nswapdev           uint32
+	swpages            uint32
+	swpginuse          uint32
+	swpgonly           uint32
+	nswget             uint32
+	nanon              uint32
+	nanonneeded        uint32
+	nfreeanon          uint32
+	faults             uint32
+	traps              uint32
+	intrs              uint32
+	swtch              uint32
+	softs              uint32
+	syscalls           uint32
+	pageins            uint32
+	obsolete_swapins   uint32
+	obsolete_swapouts  uint32
+	pgswapin           uint32
+	pgswapout          uint32
+	forks              uint32
+	forks_ppwait       uint32
+	forks_sharevm      uint32
+	pga_zerohit        uint32
+	pga_zeromiss       uint32
+	zeroaborts         uint32
+	fltnoram           uint32
+	fltnoanon          uint32
+	fltpgwait          uint32
+	fltpgrele          uint32
+	fltrelck           uint32
+	fltrelckok         uint32
+	fltanget           uint32
+	fltanretry         uint32
+	fltamcopy          uint32
+	fltnamap           uint32
+	fltnomap           uint32
+	fltlget            uint32
+	fltget             uint32
+	flt_anon           uint32
+	flt_acow           uint32
+	flt_obj            uint32
+	flt_prcopy         uint32
+	flt_przero         uint32
+	pdwoke             uint32
+	pdrevs             uint32
+	pdswout            uint32
+	pdfreed            uint32
+	pdscans            uint32
+	pdanscan           uint32
+	pdobscan           uint32
+	pdreact            uint32
+	pdbusy             uint32
+	pdpageouts         uint32
+	pdpending          uint32
+	pddeact            uint32
+	pdreanon           uint32
+	pdrevnode          uint32
+	pdrevtext          uint32
+	fpswtch            uint32
+	kmapent            uint32
+}
+
+type Bcachestats struct {
+	numbufs        uint64
+	numbufpages    uint64
+	numdirtypages  uint64
+	numcleanpages  uint64
+	pendingwrites  uint64
+	pendingreads   uint64
+	numwrites      uint64
+	numreads       uint64
+	cachehits      uint64
+	busymapped     uint64
+	dmapages       uint64
+	highpages      uint64
+	delwribufs     uint64
+	kvaslots       uint64
+	kvaslots_avail uint64
+}
+
+type Swapent struct {
+	se_dev      C.dev_t
+	se_flags    int32
+	se_nblks    int32
+	se_inuse    int32
+	se_priority int32
+	sw_path     []byte
+}
+
+func (self *FileSystemList) Get() error {
+	num, err := syscall.Getfsstat(nil, C.MNT_NOWAIT)
+	if err != nil {
+		return err
+	}
+
+	buf := make([]syscall.Statfs_t, num)
+
+	_, err = syscall.Getfsstat(buf, C.MNT_NOWAIT)
+	if err != nil {
+		return err
+	}
+
+	fslist := make([]FileSystem, 0, num)
+
+	for i := 0; i < num; i++ {
+		fs := FileSystem{}
+
+		fs.DirName = bytePtrToString(&buf[i].F_mntonname[0])
+		fs.DevName = bytePtrToString(&buf[i].F_mntfromname[0])
+		fs.SysTypeName = bytePtrToString(&buf[i].F_fstypename[0])
+
+		fslist = append(fslist, fs)
+	}
+
+	self.List = fslist
+
+	return err
+}
+
+func (self *FileSystemUsage) Get(path string) error {
+	stat := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &stat)
+	if err != nil {
+		return err
+	}
+
+	self.Total = uint64(stat.F_blocks) * uint64(stat.F_bsize)
+	self.Free = uint64(stat.F_bfree) * uint64(stat.F_bsize)
+	self.Avail = uint64(stat.F_bavail) * uint64(stat.F_bsize)
+	self.Used = self.Total - self.Free
+	self.Files = stat.F_files
+	self.FreeFiles = stat.F_ffree
+
+	return nil
+}
+
+func (self *FDUsage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *LoadAverage) Get() error {
+	avg := []C.double{0, 0, 0}
+
+	C.getloadavg(&avg[0], C.int(len(avg)))
+
+	self.One = float64(avg[0])
+	self.Five = float64(avg[1])
+	self.Fifteen = float64(avg[2])
+
+	return nil
+}
+
+func (self *Uptime) Get() error {
+	tv := syscall.Timeval{}
+	mib := [2]int32{C.CTL_KERN, C.KERN_BOOTTIME}
+
+	n := uintptr(0)
+	// First we determine how much memory we'll need to pass later on (via `n`)
+	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	// Now perform the actual sysctl(3) call, storing the result in tv
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, uintptr(unsafe.Pointer(&tv)), uintptr(unsafe.Pointer(&n)), 0, 0)
+
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	self.Length = time.Since(time.Unix(int64(tv.Sec), int64(tv.Usec)*1000)).Seconds()
+
+	return nil
+}
+
+func (self *Mem) Get() error {
+	n := uintptr(0)
+
+	var uvmexp Uvmexp
+	mib := [2]int32{C.CTL_VM, C.VM_UVMEXP}
+	n = uintptr(0)
+	// First we determine how much memory we'll need to pass later on (via `n`)
+	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, uintptr(unsafe.Pointer(&uvmexp)), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	var bcachestats Bcachestats
+	mib3 := [3]int32{C.CTL_VFS, C.VFS_GENERIC, C.VFS_BCACHESTAT}
+	n = uintptr(0)
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib3[0])), 3, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib3[0])), 3, uintptr(unsafe.Pointer(&bcachestats)), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	self.Total = uint64(uvmexp.npages) << uvmexp.pageshift
+	self.Used = uint64(uvmexp.npages-uvmexp.free) << uvmexp.pageshift
+	self.Free = uint64(uvmexp.free) << uvmexp.pageshift
+
+	self.ActualFree = self.Free + (uint64(bcachestats.numbufpages) << uvmexp.pageshift)
+	self.ActualUsed = self.Used - (uint64(bcachestats.numbufpages) << uvmexp.pageshift)
+
+	return nil
+}
+
+func (self *Swap) Get() error {
+	nswap := C.swapctl(C.SWAP_NSWAP, unsafe.Pointer(uintptr(0)), 0)
+
+	// If there are no swap devices, nothing to do here.
+	if nswap == 0 {
+		return nil
+	}
+
+	swdev := make([]Swapent, nswap)
+
+	rnswap := C.swapctl(C.SWAP_STATS, unsafe.Pointer(&swdev[0]), nswap)
+	if rnswap == 0 {
+		return nil
+	}
+
+	for i := 0; i < int(nswap); i++ {
+		if swdev[i].se_flags&C.SWF_ENABLE == 2 {
+			self.Used = self.Used + uint64(swdev[i].se_inuse/(1024/C.DEV_BSIZE))
+			self.Total = self.Total + uint64(swdev[i].se_nblks/(1024/C.DEV_BSIZE))
+		}
+	}
+
+	self.Free = self.Total - self.Used
+
+	return nil
+}
+
+func (self *Cpu) Get() error {
+	load := [C.CPUSTATES]C.long{C.CP_USER, C.CP_NICE, C.CP_SYS, C.CP_INTR, C.CP_IDLE}
+
+	mib := [2]int32{C.CTL_KERN, C.KERN_CPTIME}
+	n := uintptr(0)
+	// First we determine how much memory we'll need to pass later on (via `n`)
+	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, uintptr(unsafe.Pointer(&load)), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	self.User = uint64(load[0])
+	self.Nice = uint64(load[1])
+	self.Sys = uint64(load[2])
+	self.Irq = uint64(load[3])
+	self.Idle = uint64(load[4])
+
+	return nil
+}
+
+func (self *CpuList) Get() error {
+	mib := [2]int32{C.CTL_HW, C.HW_NCPU}
+	var ncpu int
+
+	n := uintptr(0)
+	// First we determine how much memory we'll need to pass later on (via `n`)
+	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	// Now perform the actual sysctl(3) call, storing the result in ncpu
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 2, uintptr(unsafe.Pointer(&ncpu)), uintptr(unsafe.Pointer(&n)), 0, 0)
+
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	load := [C.CPUSTATES]C.long{C.CP_USER, C.CP_NICE, C.CP_SYS, C.CP_INTR, C.CP_IDLE}
+
+	self.List = make([]Cpu, ncpu)
+	for curcpu := range self.List {
+		sysctlCptime(ncpu, curcpu, &load)
+		fillCpu(&self.List[curcpu], load)
+	}
+
+	return nil
+}
+
+func (self *ProcList) Get() error {
+	return nil
+}
+
+func (self *ProcArgs) Get(pid int) error {
+	return nil
+}
+
+func (self *ProcEnv) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *ProcState) Get(pid int) error {
+	return nil
+}
+
+func (self *ProcMem) Get(pid int) error {
+	return nil
+}
+
+func (self *ProcTime) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *ProcExe) Get(pid int) error {
+	return nil
+}
+
+func (self *ProcFDUsage) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func fillCpu(cpu *Cpu, load [C.CPUSTATES]C.long) {
+	cpu.User = uint64(load[0])
+	cpu.Nice = uint64(load[1])
+	cpu.Sys = uint64(load[2])
+	cpu.Irq = uint64(load[3])
+	cpu.Idle = uint64(load[4])
+}
+
+func sysctlCptime(ncpu int, curcpu int, load *[C.CPUSTATES]C.long) error {
+	var mib []int32
+
+	// Use the correct mib based on the number of CPUs and fill out the
+	// current CPU number in case of SMP. (0 indexed cf. self.List)
+	if ncpu == 0 {
+		mib = []int32{C.CTL_KERN, C.KERN_CPTIME}
+	} else {
+		mib = []int32{C.CTL_KERN, C.KERN_CPTIME2, int32(curcpu)}
+	}
+
+	len := len(mib)
+
+	n := uintptr(0)
+	// First we determine how much memory we'll need to pass later on (via `n`)
+	_, _, errno := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), uintptr(len), 0, uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	_, _, errno = syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), uintptr(len), uintptr(unsafe.Pointer(load)), uintptr(unsafe.Pointer(&n)), 0, 0)
+	if errno != 0 || n == 0 {
+		return nil
+	}
+
+	return nil
+}
--- a/vendor/github.com/elastic/gosigar/sigar_stub.go
+++ b/vendor/github.com/elastic/gosigar/sigar_stub.go
@ -0,0 +1,71 @@
+// +build !darwin,!freebsd,!linux,!openbsd,!windows
+
+package gosigar
+
+import (
+	"runtime"
+)
+
+func (c *Cpu) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (l *LoadAverage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (m *Mem) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (s *Swap) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (f *FDUsage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcTime) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *FileSystemUsage) Get(path string) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *CpuList) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcState) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcExe) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcMem) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcFDUsage) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcEnv) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcList) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (p *ProcArgs) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *Rusage) Get(int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
--- a/vendor/github.com/elastic/gosigar/sigar_unix.go
+++ b/vendor/github.com/elastic/gosigar/sigar_unix.go
@ -0,0 +1,69 @@
+// Copyright (c) 2012 VMware, Inc.
+
+// +build darwin freebsd linux
+
+package gosigar
+
+import (
+	"syscall"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+func (self *FileSystemUsage) Get(path string) error {
+	stat := syscall.Statfs_t{}
+	err := syscall.Statfs(path, &stat)
+	if err != nil {
+		return err
+	}
+
+	self.Total = uint64(stat.Blocks) * uint64(stat.Bsize)
+	self.Free = uint64(stat.Bfree) * uint64(stat.Bsize)
+	self.Avail = uint64(stat.Bavail) * uint64(stat.Bsize)
+	self.Used = self.Total - self.Free
+	self.Files = stat.Files
+	self.FreeFiles = uint64(stat.Ffree)
+
+	return nil
+}
+
+func (r *Rusage) Get(who int) error {
+	ru, err := getResourceUsage(who)
+	if err != nil {
+		return err
+	}
+
+	uTime := convertRtimeToDur(ru.Utime)
+	sTime := convertRtimeToDur(ru.Stime)
+
+	r.Utime = uTime
+	r.Stime = sTime
+	r.Maxrss = int64(ru.Maxrss)
+	r.Ixrss = int64(ru.Ixrss)
+	r.Idrss = int64(ru.Idrss)
+	r.Isrss = int64(ru.Isrss)
+	r.Minflt = int64(ru.Minflt)
+	r.Majflt = int64(ru.Majflt)
+	r.Nswap = int64(ru.Nswap)
+	r.Inblock = int64(ru.Inblock)
+	r.Oublock = int64(ru.Oublock)
+	r.Msgsnd = int64(ru.Msgsnd)
+	r.Msgrcv = int64(ru.Msgrcv)
+	r.Nsignals = int64(ru.Nsignals)
+	r.Nvcsw = int64(ru.Nvcsw)
+	r.Nivcsw = int64(ru.Nivcsw)
+
+	return nil
+}
+
+func getResourceUsage(who int) (unix.Rusage, error) {
+	r := unix.Rusage{}
+	err := unix.Getrusage(who, &r)
+
+	return r, err
+}
+
+func convertRtimeToDur(t unix.Timeval) time.Duration {
+	return time.Duration(t.Nano())
+}
--- a/vendor/github.com/elastic/gosigar/sigar_util.go
+++ b/vendor/github.com/elastic/gosigar/sigar_util.go
@ -0,0 +1,22 @@
+// Copyright (c) 2012 VMware, Inc.
+
+package gosigar
+
+import (
+	"unsafe"
+)
+
+func bytePtrToString(ptr *int8) string {
+	bytes := (*[10000]byte)(unsafe.Pointer(ptr))
+
+	n := 0
+	for bytes[n] != 0 {
+		n++
+	}
+
+	return string(bytes[0:n])
+}
+
+func chop(buf []byte) []byte {
+	return buf[0 : len(buf)-1]
+}
--- a/vendor/github.com/elastic/gosigar/sigar_windows.go
+++ b/vendor/github.com/elastic/gosigar/sigar_windows.go
@ -0,0 +1,437 @@
+// Copyright (c) 2012 VMware, Inc.
+
+package gosigar
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/StackExchange/wmi"
+	"github.com/elastic/gosigar/sys/windows"
+	"github.com/pkg/errors"
+)
+
+// Win32_Process represents a process on the Windows operating system. If
+// additional fields are added here (that match the Windows struct) they will
+// automatically be populated when calling getWin32Process.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa394372(v=vs.85).aspx
+type Win32_Process struct {
+	CommandLine string
+}
+
+// Win32_OperatingSystem WMI class represents a Windows-based operating system
+// installed on a computer.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa394239(v=vs.85).aspx
+type Win32_OperatingSystem struct {
+	LastBootUpTime time.Time
+}
+
+var (
+	// version is Windows version of the host OS.
+	version = windows.GetWindowsVersion()
+
+	// processQueryLimitedInfoAccess is set to PROCESS_QUERY_INFORMATION for Windows
+	// 2003 and XP where PROCESS_QUERY_LIMITED_INFORMATION is unknown. For all newer
+	// OS versions it is set to PROCESS_QUERY_LIMITED_INFORMATION.
+	processQueryLimitedInfoAccess = windows.PROCESS_QUERY_LIMITED_INFORMATION
+
+	// bootTime is the time when the OS was last booted. This value may be nil
+	// on operating systems that do not support the WMI query used to obtain it.
+	bootTime     *time.Time
+	bootTimeLock sync.Mutex
+)
+
+func init() {
+	if !version.IsWindowsVistaOrGreater() {
+		// PROCESS_QUERY_LIMITED_INFORMATION cannot be used on 2003 or XP.
+		processQueryLimitedInfoAccess = syscall.PROCESS_QUERY_INFORMATION
+	}
+}
+
+func (self *LoadAverage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *FDUsage) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *ProcEnv) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *ProcExe) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *ProcFDUsage) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
+func (self *Uptime) Get() error {
+	// Minimum supported OS is Windows Vista.
+	if !version.IsWindowsVistaOrGreater() {
+		return ErrNotImplemented{runtime.GOOS}
+	}
+
+	bootTimeLock.Lock()
+	defer bootTimeLock.Unlock()
+	if bootTime == nil {
+		os, err := getWin32OperatingSystem()
+		if err != nil {
+			return errors.Wrap(err, "failed to get boot time using WMI")
+		}
+		bootTime = &os.LastBootUpTime
+	}
+
+	self.Length = time.Since(*bootTime).Seconds()
+	return nil
+}
+
+func (self *Mem) Get() error {
+	memoryStatusEx, err := windows.GlobalMemoryStatusEx()
+	if err != nil {
+		return errors.Wrap(err, "GlobalMemoryStatusEx failed")
+	}
+
+	self.Total = memoryStatusEx.TotalPhys
+	self.Free = memoryStatusEx.AvailPhys
+	self.Used = self.Total - self.Free
+	self.ActualFree = self.Free
+	self.ActualUsed = self.Used
+	return nil
+}
+
+func (self *Swap) Get() error {
+	memoryStatusEx, err := windows.GlobalMemoryStatusEx()
+	if err != nil {
+		return errors.Wrap(err, "GlobalMemoryStatusEx failed")
+	}
+
+	self.Total = memoryStatusEx.TotalPageFile
+	self.Free = memoryStatusEx.AvailPageFile
+	self.Used = self.Total - self.Free
+	return nil
+}
+
+func (self *Cpu) Get() error {
+	idle, kernel, user, err := windows.GetSystemTimes()
+	if err != nil {
+		return errors.Wrap(err, "GetSystemTimes failed")
+	}
+
+	// CPU times are reported in milliseconds by gosigar.
+	self.Idle = uint64(idle / time.Millisecond)
+	self.Sys = uint64(kernel / time.Millisecond)
+	self.User = uint64(user / time.Millisecond)
+	return nil
+}
+
+func (self *CpuList) Get() error {
+	cpus, err := windows.NtQuerySystemProcessorPerformanceInformation()
+	if err != nil {
+		return errors.Wrap(err, "NtQuerySystemProcessorPerformanceInformation failed")
+	}
+
+	self.List = make([]Cpu, 0, len(cpus))
+	for _, cpu := range cpus {
+		self.List = append(self.List, Cpu{
+			Idle: uint64(cpu.IdleTime / time.Millisecond),
+			Sys:  uint64(cpu.KernelTime / time.Millisecond),
+			User: uint64(cpu.UserTime / time.Millisecond),
+		})
+	}
+	return nil
+}
+
+func (self *FileSystemList) Get() error {
+	drives, err := windows.GetLogicalDriveStrings()
+	if err != nil {
+		return errors.Wrap(err, "GetLogicalDriveStrings failed")
+	}
+
+	for _, drive := range drives {
+		dt, err := windows.GetDriveType(drive)
+		if err != nil {
+			return errors.Wrapf(err, "GetDriveType failed")
+		}
+
+		self.List = append(self.List, FileSystem{
+			DirName:  drive,
+			DevName:  drive,
+			TypeName: dt.String(),
+		})
+	}
+	return nil
+}
+
+// Get retrieves a list of all process identifiers (PIDs) in the system.
+func (self *ProcList) Get() error {
+	pids, err := windows.EnumProcesses()
+	if err != nil {
+		return errors.Wrap(err, "EnumProcesses failed")
+	}
+
+	// Convert uint32 PIDs to int.
+	self.List = make([]int, 0, len(pids))
+	for _, pid := range pids {
+		self.List = append(self.List, int(pid))
+	}
+	return nil
+}
+
+func (self *ProcState) Get(pid int) error {
+	var errs []error
+
+	var err error
+	self.Name, err = getProcName(pid)
+	if err != nil {
+		errs = append(errs, errors.Wrap(err, "getProcName failed"))
+	}
+
+	self.State, err = getProcStatus(pid)
+	if err != nil {
+		errs = append(errs, errors.Wrap(err, "getProcStatus failed"))
+	}
+
+	self.Ppid, err = getParentPid(pid)
+	if err != nil {
+		errs = append(errs, errors.Wrap(err, "getParentPid failed"))
+	}
+
+	self.Username, err = getProcCredName(pid)
+	if err != nil {
+		errs = append(errs, errors.Wrap(err, "getProcCredName failed"))
+	}
+
+	if len(errs) > 0 {
+		errStrs := make([]string, 0, len(errs))
+		for _, e := range errs {
+			errStrs = append(errStrs, e.Error())
+		}
+		return errors.New(strings.Join(errStrs, "; "))
+	}
+	return nil
+}
+
+// getProcName returns the process name associated with the PID.
+func getProcName(pid int) (string, error) {
+	handle, err := syscall.OpenProcess(processQueryLimitedInfoAccess, false, uint32(pid))
+	if err != nil {
+		return "", errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	filename, err := windows.GetProcessImageFileName(handle)
+	if err != nil {
+		return "", errors.Wrapf(err, "GetProcessImageFileName failed for pid=%v", pid)
+	}
+
+	return filepath.Base(filename), nil
+}
+
+// getProcStatus returns the status of a process.
+func getProcStatus(pid int) (RunState, error) {
+	handle, err := syscall.OpenProcess(processQueryLimitedInfoAccess, false, uint32(pid))
+	if err != nil {
+		return RunStateUnknown, errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	var exitCode uint32
+	err = syscall.GetExitCodeProcess(handle, &exitCode)
+	if err != nil {
+		return RunStateUnknown, errors.Wrapf(err, "GetExitCodeProcess failed for pid=%v")
+	}
+
+	if exitCode == 259 { //still active
+		return RunStateRun, nil
+	}
+	return RunStateSleep, nil
+}
+
+// getParentPid returns the parent process ID of a process.
+func getParentPid(pid int) (int, error) {
+	handle, err := syscall.OpenProcess(processQueryLimitedInfoAccess, false, uint32(pid))
+	if err != nil {
+		return RunStateUnknown, errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	procInfo, err := windows.NtQueryProcessBasicInformation(handle)
+	if err != nil {
+		return 0, errors.Wrapf(err, "NtQueryProcessBasicInformation failed for pid=%v", pid)
+	}
+
+	return int(procInfo.InheritedFromUniqueProcessID), nil
+}
+
+func getProcCredName(pid int) (string, error) {
+	handle, err := syscall.OpenProcess(syscall.PROCESS_QUERY_INFORMATION, false, uint32(pid))
+	if err != nil {
+		return "", errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	// Find process token via win32.
+	var token syscall.Token
+	err = syscall.OpenProcessToken(handle, syscall.TOKEN_QUERY, &token)
+	if err != nil {
+		return "", errors.Wrapf(err, "OpenProcessToken failed for pid=%v", pid)
+	}
+
+	// Find the token user.
+	tokenUser, err := token.GetTokenUser()
+	if err != nil {
+		return "", errors.Wrapf(err, "GetTokenInformation failed for pid=%v", pid)
+	}
+
+	// Close token to prevent handle leaks.
+	err = token.Close()
+	if err != nil {
+		return "", errors.Wrapf(err, "failed while closing process token handle for pid=%v", pid)
+	}
+
+	// Look up domain account by SID.
+	account, domain, _, err := tokenUser.User.Sid.LookupAccount("")
+	if err != nil {
+		sid, sidErr := tokenUser.User.Sid.String()
+		if sidErr != nil {
+			return "", errors.Wrapf(err, "failed while looking up account name for pid=%v", pid)
+		}
+		return "", errors.Wrapf(err, "failed while looking up account name for SID=%v of pid=%v", sid, pid)
+	}
+
+	return fmt.Sprintf(`%s\%s`, domain, account), nil
+}
+
+func (self *ProcMem) Get(pid int) error {
+	handle, err := syscall.OpenProcess(processQueryLimitedInfoAccess|windows.PROCESS_VM_READ, false, uint32(pid))
+	if err != nil {
+		return errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	counters, err := windows.GetProcessMemoryInfo(handle)
+	if err != nil {
+		return errors.Wrapf(err, "GetProcessMemoryInfo failed for pid=%v", pid)
+	}
+
+	self.Resident = uint64(counters.WorkingSetSize)
+	self.Size = uint64(counters.PrivateUsage)
+	return nil
+}
+
+func (self *ProcTime) Get(pid int) error {
+	cpu, err := getProcTimes(pid)
+	if err != nil {
+		return err
+	}
+
+	// Windows epoch times are expressed as time elapsed since midnight on
+	// January 1, 1601 at Greenwich, England. This converts the Filetime to
+	// unix epoch in milliseconds.
+	self.StartTime = uint64(cpu.CreationTime.Nanoseconds() / 1e6)
+
+	// Convert to millis.
+	self.User = uint64(windows.FiletimeToDuration(&cpu.UserTime).Nanoseconds() / 1e6)
+	self.Sys = uint64(windows.FiletimeToDuration(&cpu.KernelTime).Nanoseconds() / 1e6)
+	self.Total = self.User + self.Sys
+
+	return nil
+}
+
+func getProcTimes(pid int) (*syscall.Rusage, error) {
+	handle, err := syscall.OpenProcess(processQueryLimitedInfoAccess, false, uint32(pid))
+	if err != nil {
+		return nil, errors.Wrapf(err, "OpenProcess failed for pid=%v", pid)
+	}
+	defer syscall.CloseHandle(handle)
+
+	var cpu syscall.Rusage
+	if err := syscall.GetProcessTimes(handle, &cpu.CreationTime, &cpu.ExitTime, &cpu.KernelTime, &cpu.UserTime); err != nil {
+		return nil, errors.Wrapf(err, "GetProcessTimes failed for pid=%v", pid)
+	}
+
+	return &cpu, nil
+}
+
+func (self *ProcArgs) Get(pid int) error {
+	// The minimum supported client for Win32_Process is Windows Vista.
+	if !version.IsWindowsVistaOrGreater() {
+		return ErrNotImplemented{runtime.GOOS}
+	}
+
+	process, err := getWin32Process(int32(pid))
+	if err != nil {
+		return errors.Wrapf(err, "ProcArgs failed for pid=%v", pid)
+	}
+
+	self.List = []string{process.CommandLine}
+	return nil
+}
+
+func (self *FileSystemUsage) Get(path string) error {
+	freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes, err := windows.GetDiskFreeSpaceEx(path)
+	if err != nil {
+		return errors.Wrap(err, "GetDiskFreeSpaceEx failed")
+	}
+
+	self.Total = totalNumberOfBytes
+	self.Free = totalNumberOfFreeBytes
+	self.Used = self.Total - self.Free
+	self.Avail = freeBytesAvailable
+	return nil
+}
+
+// getWin32Process gets information about the process with the given process ID.
+// It uses a WMI query to get the information from the local system.
+func getWin32Process(pid int32) (Win32_Process, error) {
+	var dst []Win32_Process
+	query := fmt.Sprintf("WHERE ProcessId = %d", pid)
+	q := wmi.CreateQuery(&dst, query)
+	err := wmi.Query(q, &dst)
+	if err != nil {
+		return Win32_Process{}, fmt.Errorf("could not get Win32_Process %s: %v", query, err)
+	}
+	if len(dst) < 1 {
+		return Win32_Process{}, fmt.Errorf("could not get Win32_Process %s: Process not found", query)
+	}
+	return dst[0], nil
+}
+
+func getWin32OperatingSystem() (Win32_OperatingSystem, error) {
+	var dst []Win32_OperatingSystem
+	q := wmi.CreateQuery(&dst, "")
+	err := wmi.Query(q, &dst)
+	if err != nil {
+		return Win32_OperatingSystem{}, errors.Wrap(err, "wmi query for Win32_OperatingSystem failed")
+	}
+	if len(dst) != 1 {
+		return Win32_OperatingSystem{}, errors.New("wmi query for Win32_OperatingSystem failed")
+	}
+	return dst[0], nil
+}
+
+func (self *Rusage) Get(who int) error {
+	if who != 0 {
+		return ErrNotImplemented{runtime.GOOS}
+	}
+
+	pid := os.Getpid()
+	cpu, err := getProcTimes(pid)
+	if err != nil {
+		return err
+	}
+
+	self.Utime = windows.FiletimeToDuration(&cpu.UserTime)
+	self.Stime = windows.FiletimeToDuration(&cpu.KernelTime)
+
+	return nil
+}
--- a/vendor/github.com/elastic/gosigar/sys/windows/doc.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/doc.go
@ -0,0 +1,2 @@
+// Package windows contains various Windows system call.
+package windows
--- a/vendor/github.com/elastic/gosigar/sys/windows/ntquery.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/ntquery.go
@ -0,0 +1,132 @@
+// +build windows
+
+package windows
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"runtime"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"github.com/pkg/errors"
+)
+
+// On both 32-bit and 64-bit systems NtQuerySystemInformation expects the
+// size of SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION to be 48.
+const sizeofSystemProcessorPerformanceInformation = 48
+
+// ProcessBasicInformation is an equivalent representation of
+// PROCESS_BASIC_INFORMATION in the Windows API.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684280(v=vs.85).aspx
+type ProcessBasicInformation struct {
+	ExitStatus                   uint
+	PebBaseAddress               uintptr
+	AffinityMask                 uint
+	BasePriority                 uint
+	UniqueProcessID              uint
+	InheritedFromUniqueProcessID uint
+}
+
+// NtQueryProcessBasicInformation queries basic information about the process
+// associated with the given handle (provided by OpenProcess). It uses the
+// NtQueryInformationProcess function to collect the data.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684280(v=vs.85).aspx
+func NtQueryProcessBasicInformation(handle syscall.Handle) (ProcessBasicInformation, error) {
+	var processBasicInfo ProcessBasicInformation
+	processBasicInfoPtr := (*byte)(unsafe.Pointer(&processBasicInfo))
+	size := uint32(unsafe.Sizeof(processBasicInfo))
+	ntStatus, _ := _NtQueryInformationProcess(handle, 0, processBasicInfoPtr, size, nil)
+	if ntStatus != 0 {
+		return ProcessBasicInformation{}, errors.Errorf("NtQueryInformationProcess failed, NTSTATUS=0x%X", ntStatus)
+	}
+
+	return processBasicInfo, nil
+}
+
+// SystemProcessorPerformanceInformation contains CPU performance information
+// for a single CPU.
+type SystemProcessorPerformanceInformation struct {
+	IdleTime   time.Duration // Amount of time spent idle.
+	KernelTime time.Duration // Kernel time does NOT include time spent in idle.
+	UserTime   time.Duration // Amount of time spent executing in user mode.
+}
+
+// _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION is an equivalent representation of
+// SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION in the Windows API. This struct is
+// used internally with NtQuerySystemInformation call and is not exported. The
+// exported equivalent is SystemProcessorPerformanceInformation.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724509(v=vs.85).aspx
+type _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION struct {
+	IdleTime   int64
+	KernelTime int64
+	UserTime   int64
+	Reserved1  [2]int64
+	Reserved2  uint32
+}
+
+// NtQuerySystemProcessorPerformanceInformation queries CPU performance
+// information for each CPU. It uses the NtQuerySystemInformation function to
+// collect the SystemProcessorPerformanceInformation.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724509(v=vs.85).aspx
+func NtQuerySystemProcessorPerformanceInformation() ([]SystemProcessorPerformanceInformation, error) {
+	// NTSTATUS code for success.
+	// https://msdn.microsoft.com/en-us/library/cc704588.aspx
+	const STATUS_SUCCESS = 0
+
+	// From the _SYSTEM_INFORMATION_CLASS enum.
+	// http://processhacker.sourceforge.net/doc/ntexapi_8h.html#ad5d815b48e8f4da1ef2eb7a2f18a54e0
+	const systemProcessorPerformanceInformation = 8
+
+	// Create a buffer large enough to hold an entry for each processor.
+	b := make([]byte, runtime.NumCPU()*sizeofSystemProcessorPerformanceInformation)
+
+	// Query the performance information. Note that this function uses 0 to
+	// indicate success. Most other Windows functions use non-zero for success.
+	var returnLength uint32
+	ntStatus, _ := _NtQuerySystemInformation(systemProcessorPerformanceInformation, &b[0], uint32(len(b)), &returnLength)
+	if ntStatus != STATUS_SUCCESS {
+		return nil, errors.Errorf("NtQuerySystemInformation failed, NTSTATUS=0x%X, bufLength=%v, returnLength=%v", ntStatus, len(b), returnLength)
+	}
+
+	return readSystemProcessorPerformanceInformationBuffer(b)
+}
+
+// readSystemProcessorPerformanceInformationBuffer reads from a buffer
+// containing SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION data. The buffer should
+// contain one entry for each CPU.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724509(v=vs.85).aspx
+func readSystemProcessorPerformanceInformationBuffer(b []byte) ([]SystemProcessorPerformanceInformation, error) {
+	n := len(b) / sizeofSystemProcessorPerformanceInformation
+	r := bytes.NewReader(b)
+
+	rtn := make([]SystemProcessorPerformanceInformation, 0, n)
+	for i := 0; i < n; i++ {
+		_, err := r.Seek(int64(i*sizeofSystemProcessorPerformanceInformation), io.SeekStart)
+		if err != nil {
+			return nil, errors.Wrapf(err, "failed to seek to cpuN=%v in buffer", i)
+		}
+
+		times := make([]uint64, 3)
+		for j := range times {
+			err := binary.Read(r, binary.LittleEndian, &times[j])
+			if err != nil {
+				return nil, errors.Wrapf(err, "failed reading cpu times for cpuN=%v", i)
+			}
+		}
+
+		idleTime := time.Duration(times[0] * 100)
+		kernelTime := time.Duration(times[1] * 100)
+		userTime := time.Duration(times[2] * 100)
+
+		rtn = append(rtn, SystemProcessorPerformanceInformation{
+			IdleTime:   idleTime,
+			KernelTime: kernelTime - idleTime, // Subtract out idle time from kernel time.
+			UserTime:   userTime,
+		})
+	}
+
+	return rtn, nil
+}
--- a/vendor/github.com/elastic/gosigar/sys/windows/privileges.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/privileges.go
@ -0,0 +1,272 @@
+// +build windows
+
+package windows
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"runtime"
+	"strings"
+	"sync"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sys/windows"
+)
+
+// Cache of privilege names to LUIDs.
+var (
+	privNames     = make(map[string]int64)
+	privNameMutex sync.Mutex
+)
+
+const (
+	// SeDebugPrivilege is the name of the privilege used to debug programs.
+	SeDebugPrivilege = "SeDebugPrivilege"
+)
+
+// Errors returned by AdjustTokenPrivileges.
+const (
+	ERROR_NOT_ALL_ASSIGNED syscall.Errno = 1300
+)
+
+// Attribute bits for privileges.
+const (
+	_SE_PRIVILEGE_ENABLED_BY_DEFAULT uint32 = 0x00000001
+	_SE_PRIVILEGE_ENABLED            uint32 = 0x00000002
+	_SE_PRIVILEGE_REMOVED            uint32 = 0x00000004
+	_SE_PRIVILEGE_USED_FOR_ACCESS    uint32 = 0x80000000
+)
+
+// Privilege contains information about a single privilege associated with a
+// Token.
+type Privilege struct {
+	LUID             int64  `json:"-"` // Locally unique identifier (guaranteed only until the system is restarted).
+	Name             string `json:"-"`
+	EnabledByDefault bool   `json:"enabled_by_default,omitempty"`
+	Enabled          bool   `json:"enabled"`
+	Removed          bool   `json:"removed,omitempty"`
+	Used             bool   `json:"used,omitempty"`
+}
+
+func (p Privilege) String() string {
+	var buf bytes.Buffer
+	buf.WriteString(p.Name)
+	buf.WriteString("=(")
+
+	opts := make([]string, 0, 4)
+	if p.EnabledByDefault {
+		opts = append(opts, "Default")
+	}
+	if p.Enabled {
+		opts = append(opts, "Enabled")
+	}
+	if !p.EnabledByDefault && !p.Enabled {
+		opts = append(opts, "Disabled")
+	}
+	if p.Removed {
+		opts = append(opts, "Removed")
+	}
+	if p.Used {
+		opts = append(opts, "Used")
+	}
+
+	buf.WriteString(strings.Join(opts, ", "))
+	buf.WriteString(")")
+
+	// Example: SeDebugPrivilege=(Default, Enabled)
+	return buf.String()
+}
+
+// User represent the information about a Windows account.
+type User struct {
+	SID     string
+	Account string
+	Domain  string
+	Type    uint32
+}
+
+func (u User) String() string {
+	return fmt.Sprintf(`User:%v\%v, SID:%v, Type:%v`, u.Domain, u.Account, u.SID, u.Type)
+}
+
+// DebugInfo contains general debug info about the current process.
+type DebugInfo struct {
+	OSVersion    Version              // OS version info.
+	Arch         string               // Architecture of the machine.
+	NumCPU       int                  // Number of CPUs.
+	User         User                 // User that this process is running as.
+	ProcessPrivs map[string]Privilege // Privileges held by the process.
+}
+
+func (d DebugInfo) String() string {
+	bytes, _ := json.Marshal(d)
+	return string(bytes)
+}
+
+// LookupPrivilegeName looks up a privilege name given a LUID value.
+func LookupPrivilegeName(systemName string, luid int64) (string, error) {
+	buf := make([]uint16, 256)
+	bufSize := uint32(len(buf))
+	err := _LookupPrivilegeName(systemName, &luid, &buf[0], &bufSize)
+	if err != nil {
+		return "", errors.Wrapf(err, "LookupPrivilegeName failed for luid=%v", luid)
+	}
+
+	return syscall.UTF16ToString(buf), nil
+}
+
+// mapPrivileges maps privilege names to LUID values.
+func mapPrivileges(names []string) ([]int64, error) {
+	var privileges []int64
+	privNameMutex.Lock()
+	defer privNameMutex.Unlock()
+	for _, name := range names {
+		p, ok := privNames[name]
+		if !ok {
+			err := _LookupPrivilegeValue("", name, &p)
+			if err != nil {
+				return nil, errors.Wrapf(err, "LookupPrivilegeValue failed on '%v'", name)
+			}
+			privNames[name] = p
+		}
+		privileges = append(privileges, p)
+	}
+	return privileges, nil
+}
+
+// EnableTokenPrivileges enables the specified privileges in the given
+// Token. The token must have TOKEN_ADJUST_PRIVILEGES access. If the token
+// does not already contain the privilege it cannot be enabled.
+func EnableTokenPrivileges(token syscall.Token, privileges ...string) error {
+	privValues, err := mapPrivileges(privileges)
+	if err != nil {
+		return err
+	}
+
+	var b bytes.Buffer
+	binary.Write(&b, binary.LittleEndian, uint32(len(privValues)))
+	for _, p := range privValues {
+		binary.Write(&b, binary.LittleEndian, p)
+		binary.Write(&b, binary.LittleEndian, uint32(_SE_PRIVILEGE_ENABLED))
+	}
+
+	success, err := _AdjustTokenPrivileges(token, false, &b.Bytes()[0], uint32(b.Len()), nil, nil)
+	if !success {
+		return err
+	}
+	if err == ERROR_NOT_ALL_ASSIGNED {
+		return errors.Wrap(err, "error not all privileges were assigned")
+	}
+
+	return nil
+}
+
+// GetTokenPrivileges returns a list of privileges associated with a token.
+// The provided token must have at a minimum TOKEN_QUERY access. This is a
+// wrapper around the GetTokenInformation function.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa446671(v=vs.85).aspx
+func GetTokenPrivileges(token syscall.Token) (map[string]Privilege, error) {
+	// Determine the required buffer size.
+	var size uint32
+	syscall.GetTokenInformation(token, syscall.TokenPrivileges, nil, 0, &size)
+
+	// This buffer will receive a TOKEN_PRIVILEGE structure.
+	b := bytes.NewBuffer(make([]byte, size))
+	err := syscall.GetTokenInformation(token, syscall.TokenPrivileges, &b.Bytes()[0], uint32(b.Len()), &size)
+	if err != nil {
+		return nil, errors.Wrap(err, "GetTokenInformation failed")
+	}
+
+	var privilegeCount uint32
+	err = binary.Read(b, binary.LittleEndian, &privilegeCount)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to read PrivilegeCount")
+	}
+
+	rtn := make(map[string]Privilege, privilegeCount)
+	for i := 0; i < int(privilegeCount); i++ {
+		var luid int64
+		err = binary.Read(b, binary.LittleEndian, &luid)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to read LUID value")
+		}
+
+		var attributes uint32
+		err = binary.Read(b, binary.LittleEndian, &attributes)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to read attributes")
+		}
+
+		name, err := LookupPrivilegeName("", luid)
+		if err != nil {
+			return nil, errors.Wrapf(err, "LookupPrivilegeName failed for LUID=%v", luid)
+		}
+
+		rtn[name] = Privilege{
+			LUID:             luid,
+			Name:             name,
+			EnabledByDefault: (attributes & _SE_PRIVILEGE_ENABLED_BY_DEFAULT) > 0,
+			Enabled:          (attributes & _SE_PRIVILEGE_ENABLED) > 0,
+			Removed:          (attributes & _SE_PRIVILEGE_REMOVED) > 0,
+			Used:             (attributes & _SE_PRIVILEGE_USED_FOR_ACCESS) > 0,
+		}
+	}
+
+	return rtn, nil
+}
+
+// GetTokenUser returns the User associated with the given Token.
+func GetTokenUser(token syscall.Token) (User, error) {
+	tokenUser, err := token.GetTokenUser()
+	if err != nil {
+		return User{}, errors.Wrap(err, "GetTokenUser failed")
+	}
+
+	var user User
+	user.SID, err = tokenUser.User.Sid.String()
+	if err != nil {
+		return user, errors.Wrap(err, "ConvertSidToStringSid failed")
+	}
+
+	user.Account, user.Domain, user.Type, err = tokenUser.User.Sid.LookupAccount("")
+	if err != nil {
+		return user, errors.Wrap(err, "LookupAccountSid failed")
+	}
+
+	return user, nil
+}
+
+// GetDebugInfo returns general debug info about the current process.
+func GetDebugInfo() (*DebugInfo, error) {
+	h, err := windows.GetCurrentProcess()
+	if err != nil {
+		return nil, err
+	}
+
+	var token syscall.Token
+	err = syscall.OpenProcessToken(syscall.Handle(h), syscall.TOKEN_QUERY, &token)
+	if err != nil {
+		return nil, err
+	}
+
+	privs, err := GetTokenPrivileges(token)
+	if err != nil {
+		return nil, err
+	}
+
+	user, err := GetTokenUser(token)
+	if err != nil {
+		return nil, err
+	}
+
+	return &DebugInfo{
+		User:         user,
+		ProcessPrivs: privs,
+		OSVersion:    GetWindowsVersion(),
+		Arch:         runtime.GOARCH,
+		NumCPU:       runtime.NumCPU(),
+	}, nil
+}
--- a/vendor/github.com/elastic/gosigar/sys/windows/syscall_windows.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/syscall_windows.go
@ -0,0 +1,385 @@
+package windows
+
+import (
+	"fmt"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"github.com/pkg/errors"
+)
+
+var (
+	sizeofUint32                  = 4
+	sizeofProcessEntry32          = uint32(unsafe.Sizeof(ProcessEntry32{}))
+	sizeofProcessMemoryCountersEx = uint32(unsafe.Sizeof(ProcessMemoryCountersEx{}))
+	sizeofMemoryStatusEx          = uint32(unsafe.Sizeof(MemoryStatusEx{}))
+)
+
+// Process-specific access rights. Others are declared in the syscall package.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684880(v=vs.85).aspx
+const (
+	PROCESS_QUERY_LIMITED_INFORMATION uint32 = 0x1000
+	PROCESS_VM_READ                   uint32 = 0x0010
+)
+
+// MAX_PATH is the maximum length for a path in Windows.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
+const MAX_PATH = 260
+
+// DriveType represents a type of drive (removable, fixed, CD-ROM, RAM disk, or
+// network drive).
+type DriveType uint32
+
+// Drive types as returned by GetDriveType.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364939(v=vs.85).aspx
+const (
+	DRIVE_UNKNOWN DriveType = iota
+	DRIVE_NO_ROOT_DIR
+	DRIVE_REMOVABLE
+	DRIVE_FIXED
+	DRIVE_REMOTE
+	DRIVE_CDROM
+	DRIVE_RAMDISK
+)
+
+func (dt DriveType) String() string {
+	names := map[DriveType]string{
+		DRIVE_UNKNOWN:     "unknown",
+		DRIVE_NO_ROOT_DIR: "invalid",
+		DRIVE_REMOVABLE:   "removable",
+		DRIVE_FIXED:       "fixed",
+		DRIVE_REMOTE:      "remote",
+		DRIVE_CDROM:       "cdrom",
+		DRIVE_RAMDISK:     "ramdisk",
+	}
+
+	name, found := names[dt]
+	if !found {
+		return "unknown DriveType value"
+	}
+	return name
+}
+
+// Flags that can be used with CreateToolhelp32Snapshot.
+const (
+	TH32CS_INHERIT      uint32 = 0x80000000 // Indicates that the snapshot handle is to be inheritable.
+	TH32CS_SNAPHEAPLIST uint32 = 0x00000001 // Includes all heaps of the process specified in th32ProcessID in the snapshot.
+	TH32CS_SNAPMODULE   uint32 = 0x00000008 // Includes all modules of the process specified in th32ProcessID in the snapshot.
+	TH32CS_SNAPMODULE32 uint32 = 0x00000010 // Includes all 32-bit modules of the process specified in th32ProcessID in the snapshot when called from a 64-bit process.
+	TH32CS_SNAPPROCESS  uint32 = 0x00000002 // Includes all processes in the system in the snapshot.
+	TH32CS_SNAPTHREAD   uint32 = 0x00000004 // Includes all threads in the system in the snapshot.
+)
+
+// ProcessEntry32 is an equivalent representation of PROCESSENTRY32 in the
+// Windows API. It contains a process's information. Do not modify or reorder.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684839(v=vs.85).aspx
+type ProcessEntry32 struct {
+	size              uint32
+	CntUsage          uint32
+	ProcessID         uint32
+	DefaultHeapID     uintptr
+	ModuleID          uint32
+	CntThreads        uint32
+	ParentProcessID   uint32
+	PriorityClassBase int32
+	Flags             uint32
+	exeFile           [MAX_PATH]uint16
+}
+
+// ExeFile returns the name of the executable file for the process. It does
+// not contain the full path.
+func (p ProcessEntry32) ExeFile() string {
+	return syscall.UTF16ToString(p.exeFile[:])
+}
+
+func (p ProcessEntry32) String() string {
+	return fmt.Sprintf("{CntUsage:%v ProcessID:%v DefaultHeapID:%v ModuleID:%v "+
+		"CntThreads:%v ParentProcessID:%v PriorityClassBase:%v Flags:%v ExeFile:%v",
+		p.CntUsage, p.ProcessID, p.DefaultHeapID, p.ModuleID, p.CntThreads,
+		p.ParentProcessID, p.PriorityClassBase, p.Flags, p.ExeFile())
+}
+
+// MemoryStatusEx is an equivalent representation of MEMORYSTATUSEX in the
+// Windows API. It contains information about the current state of both physical
+// and virtual memory, including extended memory.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa366770
+type MemoryStatusEx struct {
+	length               uint32
+	MemoryLoad           uint32
+	TotalPhys            uint64
+	AvailPhys            uint64
+	TotalPageFile        uint64
+	AvailPageFile        uint64
+	TotalVirtual         uint64
+	AvailVirtual         uint64
+	AvailExtendedVirtual uint64
+}
+
+// ProcessMemoryCountersEx is an equivalent representation of
+// PROCESS_MEMORY_COUNTERS_EX in the Windows API.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684874(v=vs.85).aspx
+type ProcessMemoryCountersEx struct {
+	cb                         uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uintptr
+	WorkingSetSize             uintptr
+	QuotaPeakPagedPoolUsage    uintptr
+	QuotaPagedPoolUsage        uintptr
+	QuotaPeakNonPagedPoolUsage uintptr
+	QuotaNonPagedPoolUsage     uintptr
+	PagefileUsage              uintptr
+	PeakPagefileUsage          uintptr
+	PrivateUsage               uintptr
+}
+
+// GetLogicalDriveStrings returns a list of drives in the system.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364975(v=vs.85).aspx
+func GetLogicalDriveStrings() ([]string, error) {
+	// Determine the size of the buffer required to receive all drives.
+	bufferLength, err := _GetLogicalDriveStringsW(0, nil)
+	if err != nil {
+		return nil, errors.Wrap(err, "GetLogicalDriveStringsW failed to get buffer length")
+	}
+	if bufferLength < 0 {
+		return nil, errors.New("GetLogicalDriveStringsW returned an invalid buffer length")
+	}
+
+	buffer := make([]uint16, bufferLength)
+	_, err = _GetLogicalDriveStringsW(uint32(len(buffer)), &buffer[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "GetLogicalDriveStringsW failed")
+	}
+
+	// Split the uint16 slice at null-terminators.
+	var startIdx int
+	var drivesUTF16 [][]uint16
+	for i, value := range buffer {
+		if value == 0 {
+			drivesUTF16 = append(drivesUTF16, buffer[startIdx:i])
+			startIdx = i + 1
+		}
+	}
+
+	// Convert the utf16 slices to strings.
+	drives := make([]string, 0, len(drivesUTF16))
+	for _, driveUTF16 := range drivesUTF16 {
+		if len(driveUTF16) > 0 {
+			drives = append(drives, syscall.UTF16ToString(driveUTF16))
+		}
+	}
+
+	return drives, nil
+}
+
+// GlobalMemoryStatusEx retrieves information about the system's current usage
+// of both physical and virtual memory.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa366589(v=vs.85).aspx
+func GlobalMemoryStatusEx() (MemoryStatusEx, error) {
+	memoryStatusEx := MemoryStatusEx{length: sizeofMemoryStatusEx}
+	err := _GlobalMemoryStatusEx(&memoryStatusEx)
+	if err != nil {
+		return MemoryStatusEx{}, errors.Wrap(err, "GlobalMemoryStatusEx failed")
+	}
+
+	return memoryStatusEx, nil
+}
+
+// GetProcessMemoryInfo retrieves information about the memory usage of the
+// specified process.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms683219(v=vs.85).aspx
+func GetProcessMemoryInfo(handle syscall.Handle) (ProcessMemoryCountersEx, error) {
+	processMemoryCountersEx := ProcessMemoryCountersEx{cb: sizeofProcessMemoryCountersEx}
+	err := _GetProcessMemoryInfo(handle, &processMemoryCountersEx, processMemoryCountersEx.cb)
+	if err != nil {
+		return ProcessMemoryCountersEx{}, errors.Wrap(err, "GetProcessMemoryInfo failed")
+	}
+
+	return processMemoryCountersEx, nil
+}
+
+// GetProcessImageFileName Retrieves the name of the executable file for the
+// specified process.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms683217(v=vs.85).aspx
+func GetProcessImageFileName(handle syscall.Handle) (string, error) {
+	buffer := make([]uint16, MAX_PATH)
+	_, err := _GetProcessImageFileName(handle, &buffer[0], uint32(len(buffer)))
+	if err != nil {
+		return "", errors.Wrap(err, "GetProcessImageFileName failed")
+	}
+
+	return syscall.UTF16ToString(buffer), nil
+}
+
+// GetSystemTimes retrieves system timing information. On a multiprocessor
+// system, the values returned are the sum of the designated times across all
+// processors. The returned kernel time does not include the system idle time.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724400(v=vs.85).aspx
+func GetSystemTimes() (idle, kernel, user time.Duration, err error) {
+	var idleTime, kernelTime, userTime syscall.Filetime
+	err = _GetSystemTimes(&idleTime, &kernelTime, &userTime)
+	if err != nil {
+		return 0, 0, 0, errors.Wrap(err, "GetSystemTimes failed")
+	}
+
+	idle = FiletimeToDuration(&idleTime)
+	kernel = FiletimeToDuration(&kernelTime) // Kernel time includes idle time so we subtract it out.
+	user = FiletimeToDuration(&userTime)
+
+	return idle, kernel - idle, user, nil
+}
+
+// FiletimeToDuration converts a Filetime to a time.Duration. Do not use this
+// method to convert a Filetime to an actual clock time, for that use
+// Filetime.Nanosecond().
+func FiletimeToDuration(ft *syscall.Filetime) time.Duration {
+	n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
+	return time.Duration(n * 100)
+}
+
+// GetDriveType Determines whether a disk drive is a removable, fixed, CD-ROM,
+// RAM disk, or network drive. A trailing backslash is required on the
+// rootPathName.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364939
+func GetDriveType(rootPathName string) (DriveType, error) {
+	rootPathNamePtr, err := syscall.UTF16PtrFromString(rootPathName)
+	if err != nil {
+		return DRIVE_UNKNOWN, errors.Wrapf(err, "UTF16PtrFromString failed for rootPathName=%v", rootPathName)
+	}
+
+	dt, err := _GetDriveType(rootPathNamePtr)
+	if err != nil {
+		return DRIVE_UNKNOWN, errors.Wrapf(err, "GetDriveType failed for rootPathName=%v", rootPathName)
+	}
+
+	return dt, nil
+}
+
+// EnumProcesses retrieves the process identifier for each process object in the
+// system. This function can return a max of 65536 PIDs. If there are more
+// processes than that then this will not return them all.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms682629(v=vs.85).aspx
+func EnumProcesses() ([]uint32, error) {
+	enumProcesses := func(size int) ([]uint32, error) {
+		var (
+			pids         = make([]uint32, size)
+			sizeBytes    = len(pids) * sizeofUint32
+			bytesWritten uint32
+		)
+
+		err := _EnumProcesses(&pids[0], uint32(sizeBytes), &bytesWritten)
+
+		pidsWritten := int(bytesWritten) / sizeofUint32
+		if int(bytesWritten)%sizeofUint32 != 0 || pidsWritten > len(pids) {
+			return nil, errors.Errorf("EnumProcesses returned an invalid bytesWritten value of %v", bytesWritten)
+		}
+		pids = pids[:pidsWritten]
+
+		return pids, err
+	}
+
+	// Retry the EnumProcesses call with larger arrays if needed.
+	size := 2048
+	var pids []uint32
+	for tries := 0; tries < 5; tries++ {
+		var err error
+		pids, err = enumProcesses(size)
+		if err != nil {
+			return nil, errors.Wrap(err, "EnumProcesses failed")
+		}
+
+		if len(pids) < size {
+			break
+		}
+
+		// Increase the size the pids array and retry the enumProcesses call
+		// because the array wasn't large enough to hold all of the processes.
+		size *= 2
+	}
+
+	return pids, nil
+}
+
+// GetDiskFreeSpaceEx retrieves information about the amount of space that is
+// available on a disk volume, which is the total amount of space, the total
+// amount of free space, and the total amount of free space available to the
+// user that is associated with the calling thread.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364937(v=vs.85).aspx
+func GetDiskFreeSpaceEx(directoryName string) (freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes uint64, err error) {
+	directoryNamePtr, err := syscall.UTF16PtrFromString(directoryName)
+	if err != nil {
+		return 0, 0, 0, errors.Wrapf(err, "UTF16PtrFromString failed for directoryName=%v", directoryName)
+	}
+
+	err = _GetDiskFreeSpaceEx(directoryNamePtr, &freeBytesAvailable, &totalNumberOfBytes, &totalNumberOfFreeBytes)
+	if err != nil {
+		return 0, 0, 0, err
+	}
+
+	return freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes, nil
+}
+
+// CreateToolhelp32Snapshot takes a snapshot of the specified processes, as well
+// as the heaps, modules, and threads used by these processes.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms682489(v=vs.85).aspx
+func CreateToolhelp32Snapshot(flags, pid uint32) (syscall.Handle, error) {
+	h, err := _CreateToolhelp32Snapshot(flags, pid)
+	if err != nil {
+		return syscall.InvalidHandle, err
+	}
+	if h == syscall.InvalidHandle {
+		return syscall.InvalidHandle, syscall.GetLastError()
+	}
+
+	return h, nil
+}
+
+// Process32First retrieves information about the first process encountered in a
+// system snapshot.
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684834
+func Process32First(handle syscall.Handle) (ProcessEntry32, error) {
+	processEntry32 := ProcessEntry32{size: sizeofProcessEntry32}
+	err := _Process32First(handle, &processEntry32)
+	if err != nil {
+		return ProcessEntry32{}, errors.Wrap(err, "Process32First failed")
+	}
+
+	return processEntry32, nil
+}
+
+// Process32Next retrieves information about the next process recorded in a
+// system snapshot. When there are no more processes to iterate then
+// syscall.ERROR_NO_MORE_FILES is returned (use errors.Cause() to unwrap).
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms684836
+func Process32Next(handle syscall.Handle) (ProcessEntry32, error) {
+	processEntry32 := ProcessEntry32{size: sizeofProcessEntry32}
+	err := _Process32Next(handle, &processEntry32)
+	if err != nil {
+		return ProcessEntry32{}, errors.Wrap(err, "Process32Next failed")
+	}
+
+	return processEntry32, nil
+}
+
+// Use "GOOS=windows go generate -v -x ." to generate the source.
+
+// Add -trace to enable debug prints around syscalls.
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go
+
+// Windows API calls
+//sys   _GlobalMemoryStatusEx(buffer *MemoryStatusEx) (err error) = kernel32.GlobalMemoryStatusEx
+//sys   _GetLogicalDriveStringsW(bufferLength uint32, buffer *uint16) (length uint32, err error) = kernel32.GetLogicalDriveStringsW
+//sys   _GetProcessMemoryInfo(handle syscall.Handle, psmemCounters *ProcessMemoryCountersEx, cb uint32) (err error) = psapi.GetProcessMemoryInfo
+//sys   _GetProcessImageFileName(handle syscall.Handle, outImageFileName *uint16, size uint32) (length uint32, err error) = psapi.GetProcessImageFileNameW
+//sys   _GetSystemTimes(idleTime *syscall.Filetime, kernelTime *syscall.Filetime, userTime *syscall.Filetime) (err error) = kernel32.GetSystemTimes
+//sys   _GetDriveType(rootPathName *uint16) (dt DriveType, err error) = kernel32.GetDriveTypeW
+//sys   _EnumProcesses(processIds *uint32, sizeBytes uint32, bytesReturned *uint32) (err error) = psapi.EnumProcesses
+//sys   _GetDiskFreeSpaceEx(directoryName *uint16, freeBytesAvailable *uint64, totalNumberOfBytes *uint64, totalNumberOfFreeBytes *uint64) (err error) = kernel32.GetDiskFreeSpaceExW
+//sys   _Process32First(handle syscall.Handle, processEntry32 *ProcessEntry32) (err error) = kernel32.Process32FirstW
+//sys   _Process32Next(handle syscall.Handle, processEntry32 *ProcessEntry32) (err error) = kernel32.Process32NextW
+//sys   _CreateToolhelp32Snapshot(flags uint32, processID uint32) (handle syscall.Handle, err error) = kernel32.CreateToolhelp32Snapshot
+//sys   _NtQuerySystemInformation(systemInformationClass uint32, systemInformation *byte, systemInformationLength uint32, returnLength *uint32) (ntstatus uint32, err error) = ntdll.NtQuerySystemInformation
+//sys   _NtQueryInformationProcess(processHandle syscall.Handle, processInformationClass uint32, processInformation *byte, processInformationLength uint32, returnLength *uint32) (ntstatus uint32, err error) = ntdll.NtQueryInformationProcess
+//sys   _LookupPrivilegeName(systemName string, luid *int64, buffer *uint16, size *uint32) (err error) = advapi32.LookupPrivilegeNameW
+//sys   _LookupPrivilegeValue(systemName string, name string, luid *int64) (err error) = advapi32.LookupPrivilegeValueW
+//sys   _AdjustTokenPrivileges(token syscall.Token, releaseAll bool, input *byte, outputSize uint32, output *byte, requiredSize *uint32) (success bool, err error) [true] = advapi32.AdjustTokenPrivileges
--- a/vendor/github.com/elastic/gosigar/sys/windows/version.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/version.go
@ -0,0 +1,43 @@
+// +build windows
+
+package windows
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// Version identifies a Windows version by major, minor, and build number.
+type Version struct {
+	Major int
+	Minor int
+	Build int
+}
+
+// GetWindowsVersion returns the Windows version information. Applications not
+// manifested for Windows 8.1 or Windows 10 will return the Windows 8 OS version
+// value (6.2).
+//
+// For a table of version numbers see:
+// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724833(v=vs.85).aspx
+func GetWindowsVersion() Version {
+	// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724439(v=vs.85).aspx
+	ver, err := syscall.GetVersion()
+	if err != nil {
+		// GetVersion should never return an error.
+		panic(fmt.Errorf("GetVersion failed: %v", err))
+	}
+
+	return Version{
+		Major: int(ver & 0xFF),
+		Minor: int(ver >> 8 & 0xFF),
+		Build: int(ver >> 16),
+	}
+}
+
+// IsWindowsVistaOrGreater returns true if the Windows version is Vista or
+// greater.
+func (v Version) IsWindowsVistaOrGreater() bool {
+	// Vista is 6.0.
+	return v.Major >= 6 && v.Minor >= 0
+}
--- a/vendor/github.com/elastic/gosigar/sys/windows/zsyscall_windows.go
+++ b/vendor/github.com/elastic/gosigar/sys/windows/zsyscall_windows.go
@ -0,0 +1,260 @@
+// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package windows
+
+import "unsafe"
+import "syscall"
+
+var _ unsafe.Pointer
+
+var (
+	modkernel32 = syscall.NewLazyDLL("kernel32.dll")
+	modpsapi    = syscall.NewLazyDLL("psapi.dll")
+	modntdll    = syscall.NewLazyDLL("ntdll.dll")
+	modadvapi32 = syscall.NewLazyDLL("advapi32.dll")
+
+	procGlobalMemoryStatusEx      = modkernel32.NewProc("GlobalMemoryStatusEx")
+	procGetLogicalDriveStringsW   = modkernel32.NewProc("GetLogicalDriveStringsW")
+	procGetProcessMemoryInfo      = modpsapi.NewProc("GetProcessMemoryInfo")
+	procGetProcessImageFileNameW  = modpsapi.NewProc("GetProcessImageFileNameW")
+	procGetSystemTimes            = modkernel32.NewProc("GetSystemTimes")
+	procGetDriveTypeW             = modkernel32.NewProc("GetDriveTypeW")
+	procEnumProcesses             = modpsapi.NewProc("EnumProcesses")
+	procGetDiskFreeSpaceExW       = modkernel32.NewProc("GetDiskFreeSpaceExW")
+	procProcess32FirstW           = modkernel32.NewProc("Process32FirstW")
+	procProcess32NextW            = modkernel32.NewProc("Process32NextW")
+	procCreateToolhelp32Snapshot  = modkernel32.NewProc("CreateToolhelp32Snapshot")
+	procNtQuerySystemInformation  = modntdll.NewProc("NtQuerySystemInformation")
+	procNtQueryInformationProcess = modntdll.NewProc("NtQueryInformationProcess")
+	procLookupPrivilegeNameW      = modadvapi32.NewProc("LookupPrivilegeNameW")
+	procLookupPrivilegeValueW     = modadvapi32.NewProc("LookupPrivilegeValueW")
+	procAdjustTokenPrivileges     = modadvapi32.NewProc("AdjustTokenPrivileges")
+)
+
+func _GlobalMemoryStatusEx(buffer *MemoryStatusEx) (err error) {
+	r1, _, e1 := syscall.Syscall(procGlobalMemoryStatusEx.Addr(), 1, uintptr(unsafe.Pointer(buffer)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetLogicalDriveStringsW(bufferLength uint32, buffer *uint16) (length uint32, err error) {
+	r0, _, e1 := syscall.Syscall(procGetLogicalDriveStringsW.Addr(), 2, uintptr(bufferLength), uintptr(unsafe.Pointer(buffer)), 0)
+	length = uint32(r0)
+	if length == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetProcessMemoryInfo(handle syscall.Handle, psmemCounters *ProcessMemoryCountersEx, cb uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetProcessMemoryInfo.Addr(), 3, uintptr(handle), uintptr(unsafe.Pointer(psmemCounters)), uintptr(cb))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetProcessImageFileName(handle syscall.Handle, outImageFileName *uint16, size uint32) (length uint32, err error) {
+	r0, _, e1 := syscall.Syscall(procGetProcessImageFileNameW.Addr(), 3, uintptr(handle), uintptr(unsafe.Pointer(outImageFileName)), uintptr(size))
+	length = uint32(r0)
+	if length == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetSystemTimes(idleTime *syscall.Filetime, kernelTime *syscall.Filetime, userTime *syscall.Filetime) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetSystemTimes.Addr(), 3, uintptr(unsafe.Pointer(idleTime)), uintptr(unsafe.Pointer(kernelTime)), uintptr(unsafe.Pointer(userTime)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetDriveType(rootPathName *uint16) (dt DriveType, err error) {
+	r0, _, e1 := syscall.Syscall(procGetDriveTypeW.Addr(), 1, uintptr(unsafe.Pointer(rootPathName)), 0, 0)
+	dt = DriveType(r0)
+	if dt == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _EnumProcesses(processIds *uint32, sizeBytes uint32, bytesReturned *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procEnumProcesses.Addr(), 3, uintptr(unsafe.Pointer(processIds)), uintptr(sizeBytes), uintptr(unsafe.Pointer(bytesReturned)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _GetDiskFreeSpaceEx(directoryName *uint16, freeBytesAvailable *uint64, totalNumberOfBytes *uint64, totalNumberOfFreeBytes *uint64) (err error) {
+	r1, _, e1 := syscall.Syscall6(procGetDiskFreeSpaceExW.Addr(), 4, uintptr(unsafe.Pointer(directoryName)), uintptr(unsafe.Pointer(freeBytesAvailable)), uintptr(unsafe.Pointer(totalNumberOfBytes)), uintptr(unsafe.Pointer(totalNumberOfFreeBytes)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _Process32First(handle syscall.Handle, processEntry32 *ProcessEntry32) (err error) {
+	r1, _, e1 := syscall.Syscall(procProcess32FirstW.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(processEntry32)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _Process32Next(handle syscall.Handle, processEntry32 *ProcessEntry32) (err error) {
+	r1, _, e1 := syscall.Syscall(procProcess32NextW.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(processEntry32)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _CreateToolhelp32Snapshot(flags uint32, processID uint32) (handle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procCreateToolhelp32Snapshot.Addr(), 2, uintptr(flags), uintptr(processID), 0)
+	handle = syscall.Handle(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _NtQuerySystemInformation(systemInformationClass uint32, systemInformation *byte, systemInformationLength uint32, returnLength *uint32) (ntstatus uint32, err error) {
+	r0, _, e1 := syscall.Syscall6(procNtQuerySystemInformation.Addr(), 4, uintptr(systemInformationClass), uintptr(unsafe.Pointer(systemInformation)), uintptr(systemInformationLength), uintptr(unsafe.Pointer(returnLength)), 0, 0)
+	ntstatus = uint32(r0)
+	if ntstatus == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _NtQueryInformationProcess(processHandle syscall.Handle, processInformationClass uint32, processInformation *byte, processInformationLength uint32, returnLength *uint32) (ntstatus uint32, err error) {
+	r0, _, e1 := syscall.Syscall6(procNtQueryInformationProcess.Addr(), 5, uintptr(processHandle), uintptr(processInformationClass), uintptr(unsafe.Pointer(processInformation)), uintptr(processInformationLength), uintptr(unsafe.Pointer(returnLength)), 0)
+	ntstatus = uint32(r0)
+	if ntstatus == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _LookupPrivilegeName(systemName string, luid *int64, buffer *uint16, size *uint32) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(systemName)
+	if err != nil {
+		return
+	}
+	return __LookupPrivilegeName(_p0, luid, buffer, size)
+}
+
+func __LookupPrivilegeName(systemName *uint16, luid *int64, buffer *uint16, size *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLookupPrivilegeNameW.Addr(), 4, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(luid)), uintptr(unsafe.Pointer(buffer)), uintptr(unsafe.Pointer(size)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _LookupPrivilegeValue(systemName string, name string, luid *int64) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(systemName)
+	if err != nil {
+		return
+	}
+	var _p1 *uint16
+	_p1, err = syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return
+	}
+	return __LookupPrivilegeValue(_p0, _p1, luid)
+}
+
+func __LookupPrivilegeValue(systemName *uint16, name *uint16, luid *int64) (err error) {
+	r1, _, e1 := syscall.Syscall(procLookupPrivilegeValueW.Addr(), 3, uintptr(unsafe.Pointer(systemName)), uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(luid)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func _AdjustTokenPrivileges(token syscall.Token, releaseAll bool, input *byte, outputSize uint32, output *byte, requiredSize *uint32) (success bool, err error) {
+	var _p0 uint32
+	if releaseAll {
+		_p0 = 1
+	} else {
+		_p0 = 0
+	}
+	r0, _, e1 := syscall.Syscall6(procAdjustTokenPrivileges.Addr(), 6, uintptr(token), uintptr(_p0), uintptr(unsafe.Pointer(input)), uintptr(outputSize), uintptr(unsafe.Pointer(output)), uintptr(unsafe.Pointer(requiredSize)))
+	success = r0 != 0
+	if true {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}