104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 2007 The Android Open Source Project
|
|
*
|
|
* 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
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#define LOG_TAG "NativeHandle"
|
|
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <android/log.h>
|
|
#include <cutils/native_handle.h>
|
|
|
|
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) {
|
|
return NULL;
|
|
}
|
|
|
|
size_t mallocSize = sizeof(native_handle_t) + (sizeof(int) * (numFds + numInts));
|
|
native_handle_t* h = malloc(mallocSize);
|
|
if (h) {
|
|
h->version = sizeof(native_handle_t);
|
|
h->numFds = numFds;
|
|
h->numInts = numInts;
|
|
}
|
|
return h;
|
|
}
|
|
|
|
native_handle_t* native_handle_clone(const native_handle_t* handle)
|
|
{
|
|
native_handle_t* clone = native_handle_create(handle->numFds, handle->numInts);
|
|
int i;
|
|
|
|
for (i = 0; i < handle->numFds; i++) {
|
|
clone->data[i] = dup(handle->data[i]);
|
|
if (clone->data[i] < 0) {
|
|
clone->numFds = i;
|
|
native_handle_close(clone);
|
|
native_handle_delete(clone);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
memcpy(&clone->data[handle->numFds], &handle->data[handle->numFds],
|
|
sizeof(int) * handle->numInts);
|
|
|
|
return clone;
|
|
}
|
|
|
|
int native_handle_delete(native_handle_t* h)
|
|
{
|
|
if (h) {
|
|
if (h->version != sizeof(native_handle_t))
|
|
return -EINVAL;
|
|
free(h);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int native_handle_close(const native_handle_t* h)
|
|
{
|
|
if (h->version != sizeof(native_handle_t))
|
|
return -EINVAL;
|
|
|
|
const int numFds = h->numFds;
|
|
int i;
|
|
for (i=0 ; i<numFds ; i++) {
|
|
close(h->data[i]);
|
|
}
|
|
return 0;
|
|
}
|