Compat.h revision cb3d65323d69ee1c101a1fa04e0d0e0929ef0f4f 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef __LIB_UTILS_COMPAT_H
18#define __LIB_UTILS_COMPAT_H
19
20#include <unistd.h>
21
22#if defined(__APPLE__)
23
24/* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */
25
26typedef off_t off64_t;
27
28static inline off64_t lseek64(int fd, off64_t offset, int whence) {
29    return lseek(fd, offset, whence);
30}
31
32static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) {
33    return pread(fd, buf, nbytes, offset);
34}
35
36#endif /* __APPLE__ */
37
38#if HAVE_PRINTF_ZD
39#  define ZD "%zd"
40#  define ZD_TYPE ssize_t
41#else
42#  define ZD "%ld"
43#  define ZD_TYPE long
44#endif
45
46/*
47 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
48 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
49 * not already defined, then define it here.
50 */
51#ifndef TEMP_FAILURE_RETRY
52/* Used to retry syscalls that can return EINTR. */
53#define TEMP_FAILURE_RETRY(exp) ({         \
54    typeof (exp) _rc;                      \
55    do {                                   \
56        _rc = (exp);                       \
57    } while (_rc == -1 && errno == EINTR); \
58    _rc; })
59#endif
60
61#endif /* __LIB_UTILS_COMPAT_H */
62