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97 lines
2.3 KiB
97 lines
2.3 KiB
/*
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* Copyright (C) 2008 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/ashmem.h>
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/*
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* Implementation of the user-space ashmem API for the simulator, which lacks
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* an ashmem-enabled kernel. See ashmem-dev.c for the real ashmem-based version.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <utils/Compat.h>
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static bool ashmem_validate_stat(int fd, struct stat* buf) {
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int result = fstat(fd, buf);
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if (result == -1) {
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return false;
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}
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/*
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* Check if this is an "ashmem" region.
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* TODO: This is very hacky, and can easily break.
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* We need some reliable indicator.
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*/
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if (!(buf->st_nlink == 0 && S_ISREG(buf->st_mode))) {
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errno = ENOTTY;
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return false;
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}
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return true;
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}
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int ashmem_valid(int fd) {
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struct stat buf;
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return ashmem_validate_stat(fd, &buf);
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}
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int ashmem_create_region(const char* /*ignored*/, size_t size) {
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char pattern[PATH_MAX];
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snprintf(pattern, sizeof(pattern), "/tmp/android-ashmem-%d-XXXXXXXXX", getpid());
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int fd = mkstemp(pattern);
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if (fd == -1) return -1;
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unlink(pattern);
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if (TEMP_FAILURE_RETRY(ftruncate(fd, size)) == -1) {
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close(fd);
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return -1;
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}
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return fd;
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}
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int ashmem_set_prot_region(int /*fd*/, int /*prot*/) {
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return 0;
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}
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int ashmem_pin_region(int /*fd*/, size_t /*offset*/, size_t /*len*/) {
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return 0 /*ASHMEM_NOT_PURGED*/;
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}
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int ashmem_unpin_region(int /*fd*/, size_t /*offset*/, size_t /*len*/) {
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return 0 /*ASHMEM_IS_UNPINNED*/;
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}
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int ashmem_get_size_region(int fd)
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{
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struct stat buf;
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if (!ashmem_validate_stat(fd, &buf)) {
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return -1;
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}
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return buf.st_size;
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}
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