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92 lines
2.2 KiB
92 lines
2.2 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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/* |
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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 <stdbool.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 <cutils/ashmem.h> |
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#include <utils/Compat.h> |
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#ifndef __unused |
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#define __unused __attribute__((__unused__)) |
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#endif |
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int ashmem_create_region(const char *ignored __unused, size_t size) |
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{ |
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char template[PATH_MAX]; |
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snprintf(template, sizeof(template), "/tmp/android-ashmem-%d-XXXXXXXXX", getpid()); |
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int fd = mkstemp(template); |
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if (fd == -1) return -1; |
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unlink(template); |
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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 __unused, int prot __unused) |
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{ |
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return 0; |
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} |
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int ashmem_pin_region(int fd __unused, size_t offset __unused, size_t len __unused) |
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{ |
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return 0 /*ASHMEM_NOT_PURGED*/; |
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} |
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int ashmem_unpin_region(int fd __unused, size_t offset __unused, size_t len __unused) |
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{ |
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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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int result = fstat(fd, &buf); |
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if (result == -1) { |
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return -1; |
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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 -1; |
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} |
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return buf.st_size; |
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}
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