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Merge "Add native_handle_init"

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Chia-I Wu 2016-10-13 22:18:11 +00:00 • committed by Gerrit Code Review
commit d790aae4bc
2 changed files with 29 additions and 0 deletions
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15
include/cutils/native_handle.h
View file

@ -17,10 +17,17 @@
#ifndef NATIVE_HANDLE_H_ #ifndef NATIVE_HANDLE_H_
#define NATIVE_HANDLE_H_ #define NATIVE_HANDLE_H_
#include <stdalign.h>
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {
#endif #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 typedef struct native_handle
{ {
int version; /* sizeof(native_handle_t) */ int version; /* sizeof(native_handle_t) */
@ -46,6 +53,14 @@ typedef struct native_handle
*/ */
int native_handle_close(const native_handle_t* h); 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 * native_handle_create

14
libcutils/native_handle.c
View file

@ -28,6 +28,20 @@
static const int kMaxNativeFds = 1024; static const int kMaxNativeFds = 1024;
static const int kMaxNativeInts = 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) native_handle_t* native_handle_create(int numFds, int numInts)
{ {
if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) { if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) {