Makefile, cmd/geth: support building Android archives

cmd/geth/library_android.go

@@ -0,0 +1,56 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+// Contains specialized code for running Geth on Android.
+
+package main
+
+// #include <android/log.h>
+// #cgo LDFLAGS: -llog
+import "C"
+import (
+	"bufio"
+	"os"
+)
+
+func init() {
+	// Redirect the standard output and error to logcat
+	oldStdout, oldStderr := os.Stdout, os.Stderr
+
+	outRead, outWrite, _ := os.Pipe()
+	errRead, errWrite, _ := os.Pipe()
+
+	os.Stdout = outWrite
+	os.Stderr = errWrite
+
+	go func() {
+		scanner := bufio.NewScanner(outRead)
+		for scanner.Scan() {
+			line := scanner.Text()
+			C.__android_log_write(C.ANDROID_LOG_INFO, C.CString("Stdout"), C.CString(line))
+			oldStdout.WriteString(line + "\n")
+		}
+	}()
+
+	go func() {
+		scanner := bufio.NewScanner(errRead)
+		for scanner.Scan() {
+			line := scanner.Text()
+			C.__android_log_write(C.ANDROID_LOG_INFO, C.CString("Stderr"), C.CString(line))
+			oldStderr.WriteString(line + "\n")
+		}
+	}()
+}