141 lines
3.1 KiB
C++
141 lines
3.1 KiB
C++
/*
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* Copyright (C) 2016 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 <utils/ashmem.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdio.h>
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#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
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# include <fcntl.h>
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# include <stdlib.h>
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# include <unistd.h>
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#endif
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#if defined(WIN32)
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#include <io.h>
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#include <Windows.h>
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#include <Winbase.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#endif
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#ifdef ANDROID
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# include <sys/ioctl.h>
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# include <sys/stat.h>
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# include <memory.h>
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# include <linux/ashmem.h>
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# define ASHMEM_DEVICE "/dev/ashmem"
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#endif
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namespace utils {
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#ifdef ANDROID
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static int __ashmem_open() {
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int ret;
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struct stat st;
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int fd = open(ASHMEM_DEVICE, O_RDWR);
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if (fd < 0) {
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return fd;
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}
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ret = fstat(fd, &st);
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if (ret < 0) {
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int save_errno = errno;
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close(fd);
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errno = save_errno;
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return ret;
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}
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if (!S_ISCHR(st.st_mode) || !st.st_rdev) {
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close(fd);
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errno = ENOTTY;
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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_create_region(const char *name, size_t size) {
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int ret, save_errno;
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int fd = __ashmem_open();
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if (fd < 0) {
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return fd;
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}
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if (name) {
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char buf[ASHMEM_NAME_LEN] = {0};
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strlcpy(buf, name, sizeof(buf));
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ret = ioctl(fd, ASHMEM_SET_NAME, buf);
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if (ret < 0) {
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goto error;
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}
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}
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ret = ioctl(fd, ASHMEM_SET_SIZE, size);
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if (ret < 0) {
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goto error;
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}
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return fd;
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error:
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save_errno = errno;
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close(fd);
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errno = save_errno;
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return ret;
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}
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#elif defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
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int ashmem_create_region(const char*, size_t size) {
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char template_path[512];
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snprintf(template_path, sizeof(template_path), "/tmp/filament-ashmem-%d-XXXXXXXXX", getpid());
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int fd = mkstemp(template_path);
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if (fd == -1) return -1;
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unlink(template_path);
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if (ftruncate(fd, (off_t)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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#else
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int ashmem_create_region(const char*, size_t size) {
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char template_path[512];
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snprintf(template_path, sizeof(template_path), "/tmp/filament-ashmem-%lu-XXXXXXXXX",
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GetCurrentProcessId());
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const char* tmpPath = _mktemp(template_path);
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int fd = _open(tmpPath, _O_BINARY);
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if (fd == -1) return -1;
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unlink(template_path);
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if (_chsize(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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#endif
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} // namespace utils
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