Merge "Add native_handle_init" am: d790aae4bc (bf72cf21) · Commits · e / os / android_system_core

include/cutils/native_handle.h

+15 −0

Original line number	Diff line number	Diff line
		@@ -17,10 +17,17 @@
		#ifndef NATIVE_HANDLE_H_
		#define NATIVE_HANDLE_H_

		#include <stdalign.h>

		#ifdef __cplusplus
		extern "C" {
		#endif

		/* Declare a char array for use with native_handle_init */
		#define NATIVE_HANDLE_DECLARE_STORAGE(name, maxFds, maxInts) \
		alignas(native_handle_t) char name[ \
		sizeof(native_handle_t) + sizeof(int) * (maxFds + maxInts)]

		typedef struct native_handle
		{
		int version; /* sizeof(native_handle_t) */
		@@ -46,6 +53,14 @@ typedef struct native_handle
		*/
		int native_handle_close(const native_handle_t* h);

		/*
		* native_handle_init
		*
		* Initializes a native_handle_t from storage. storage must be declared with
		* NATIVE_HANDLE_DECLARE_STORAGE. numFds and numInts must not respectively
		* exceed maxFds and maxInts used to declare the storage.
		*/
		native_handle_t* native_handle_init(char* storage, int numFds, int numInts);

		/*
		* native_handle_create

+14 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,20 @@
		static const int kMaxNativeFds = 1024;
		static const int kMaxNativeInts = 1024;

		native_handle_t* native_handle_init(char* storage, int numFds, int numInts)
		{
		if ((uintptr_t) storage % alignof(native_handle_t)) {
		return NULL;
		}

		native_handle_t* handle = (native_handle_t*) storage;
		handle->version = sizeof(native_handle_t);
		handle->numFds = numFds;
		handle->numInts = numInts;

		return handle;
		}

		native_handle_t* native_handle_create(int numFds, int numInts)
		{
		if (numFds < 0 \|\| numInts < 0 \|\| numFds > kMaxNativeFds \|\| numInts > kMaxNativeInts) {