93 lines
2.7 KiB
C++
93 lines
2.7 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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#include <cutils/native_handle.h>
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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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native_handle_t* native_handle_init(char* storage, int numFds, int numInts) {
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if ((uintptr_t) storage % alignof(native_handle_t)) {
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errno = EINVAL;
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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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if (numFds < 0 || numInts < 0 || numFds > NATIVE_HANDLE_MAX_FDS ||
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numInts > NATIVE_HANDLE_MAX_INTS) {
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errno = EINVAL;
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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 = static_cast<native_handle_t*>(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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native_handle_t* clone = native_handle_create(handle->numFds, handle->numInts);
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if (clone == NULL) return NULL;
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for (int 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] == -1) {
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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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if (h) {
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if (h->version != sizeof(native_handle_t)) 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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if (h->version != sizeof(native_handle_t)) return -EINVAL;
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int saved_errno = errno;
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const int numFds = h->numFds;
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for (int i = 0; i < numFds; ++i) {
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close(h->data[i]);
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}
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errno = saved_errno;
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return 0;
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}
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