b843791b61
HIDL requires file descriptors to be wrapped in native_handle_t. We want
a low overhead way to do that when the number of file descriptors is known
at compile time. Instead of
// wrap an fd in native_handle_t
native_handle_t* fd_handle = native_handle_create(1, 0);
if (!fd_handle) {
// clean up and return error
}
fd_handle->data[0] = fd;
hidl_cb(..., fd_handle);
native_handle_delete(fd_handle);
this change adds native_handle_init to allow for
// wrap an fd in native_handle_t
NATIVE_HANDLE_DECLARE_STORAGE(fd_storage, 1, 0);
native_handle_t* fd_handle = native_handle_init(fd_storage, 1, 0);
fd_handle->data[0] = fd;
hidl_cb(..., fd_handle);
Test: make libcutils
Bug: 32021609
Change-Id: If1fd07482243d37492fdea57c602a1b13c8953cc
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "NativeHandle"
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <android/log.h>
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#include <cutils/native_handle.h>
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static const int kMaxNativeFds = 1024;
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static const int kMaxNativeInts = 1024;
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native_handle_t* native_handle_init(char* storage, int numFds, int numInts)
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{
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if ((uintptr_t) storage % alignof(native_handle_t)) {
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return NULL;
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}
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native_handle_t* handle = (native_handle_t*) storage;
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handle->version = sizeof(native_handle_t);
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handle->numFds = numFds;
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handle->numInts = numInts;
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return handle;
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}
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native_handle_t* native_handle_create(int numFds, int numInts)
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{
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if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) {
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return NULL;
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}
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size_t mallocSize = sizeof(native_handle_t) + (sizeof(int) * (numFds + numInts));
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native_handle_t* h = malloc(mallocSize);
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if (h) {
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h->version = sizeof(native_handle_t);
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h->numFds = numFds;
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h->numInts = numInts;
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}
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return h;
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}
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native_handle_t* native_handle_clone(const native_handle_t* handle)
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{
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native_handle_t* clone = native_handle_create(handle->numFds, handle->numInts);
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int i;
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for (i = 0; i < handle->numFds; i++) {
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clone->data[i] = dup(handle->data[i]);
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if (clone->data[i] < 0) {
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clone->numFds = i;
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native_handle_close(clone);
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native_handle_delete(clone);
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return NULL;
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}
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}
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memcpy(&clone->data[handle->numFds], &handle->data[handle->numFds],
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sizeof(int) * handle->numInts);
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return clone;
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}
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int native_handle_delete(native_handle_t* h)
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{
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if (h) {
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if (h->version != sizeof(native_handle_t))
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return -EINVAL;
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free(h);
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}
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return 0;
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}
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int native_handle_close(const native_handle_t* h)
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{
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if (h->version != sizeof(native_handle_t))
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return -EINVAL;
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const int numFds = h->numFds;
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int i;
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for (i=0 ; i<numFds ; i++) {
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close(h->data[i]);
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}
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return 0;
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}
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