summaryrefslogtreecommitdiffstats
path: root/include/utils/Compat.h
blob: 20a69207012084ac6ccb21a27b5d1e8e73bc4f07 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __LIB_UTILS_COMPAT_H
#define __LIB_UTILS_COMPAT_H

#include <unistd.h>

#if defined(__APPLE__)

/* Mac OS has always had a 64-bit off_t, so it doesn't have off64_t. */

typedef off_t off64_t;

static inline off64_t lseek64(int fd, off64_t offset, int whence) {
    return lseek(fd, offset, whence);
}

static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset) {
    return pread(fd, buf, nbytes, offset);
}

#endif /* __APPLE__ */

#if HAVE_PRINTF_ZD
#  define ZD "%zd"
#  define ZD_TYPE ssize_t
#else
#  define ZD "%ld"
#  define ZD_TYPE long
#endif

/*
 * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
 * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
 * not already defined, then define it here.
 */
#ifndef TEMP_FAILURE_RETRY
/* Used to retry syscalls that can return EINTR. */
#define TEMP_FAILURE_RETRY(exp) ({         \
    typeof (exp) _rc;                      \
    do {                                   \
        _rc = (exp);                       \
    } while (_rc == -1 && errno == EINTR); \
    _rc; })
#endif

#endif /* __LIB_UTILS_COMPAT_H */