Route program_id to program entrypoint

sdk/src/native_program.rs

@@ -1,12 +1,16 @@
 use account::KeyedAccount;
+use pubkey::Pubkey;
 
 // All native programs export a symbol named process()
 pub const ENTRYPOINT: &str = "process";
 
 // Native program ENTRYPOINT prototype
-pub type Entrypoint =
-    unsafe extern "C" fn(keyed_accounts: &mut [KeyedAccount], data: &[u8], tick_height: u64)
-        -> bool;
+pub type Entrypoint = unsafe extern "C" fn(
+    program_id: &Pubkey,
+    keyed_accounts: &mut [KeyedAccount],
+    data: &[u8],
+    tick_height: u64,
+) -> bool;
 
 // Convenience macro to define the native program entrypoint.  Supply a fn to this macro that
 // conforms to the `Entrypoint` type signature.
@@ -14,8 +18,13 @@ pub type Entrypoint =
 macro_rules! solana_entrypoint(
     ($entrypoint:ident) => (
         #[no_mangle]
-        pub extern "C" fn process(keyed_accounts: &mut [KeyedAccount], data: &[u8], tick_height: u64) -> bool {
-            return $entrypoint(keyed_accounts, data, tick_height);
+        pub extern "C" fn process(
+            program_id: &Pubkey,
+            keyed_accounts: &mut [KeyedAccount],
+            data: &[u8],
+            tick_height: u64
+        ) -> bool {
+            return $entrypoint(program_id, keyed_accounts, data, tick_height);
         }
     )
 );