1/*
2 * Copyright (C) 2012 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 PORTABILITY_H_included
18#define PORTABILITY_H_included
19
20#if defined(__APPLE__)
21
22// Mac OS.
23#include <AvailabilityMacros.h> // For MAC_OS_X_VERSION_MAX_ALLOWED
24
25#include <libkern/OSByteOrder.h>
26#define bswap_16 OSSwapInt16
27#define bswap_32 OSSwapInt32
28#define bswap_64 OSSwapInt64
29
30#include <crt_externs.h>
31#define environ (*_NSGetEnviron())
32
33// Mac OS has a 64-bit off_t and no 32-bit compatibility cruft.
34#define flock64 flock
35#define ftruncate64 ftruncate
36#define isnanf __inline_isnanf
37#define lseek64 lseek
38#define pread64 pread
39#define pwrite64 pwrite
40
41// TODO: Darwin appears to have an fdatasync syscall.
42static inline int fdatasync(int fd) { return fsync(fd); }
43
44// For Linux-compatible sendfile(3).
45#include <sys/socket.h>
46#include <sys/types.h>
47static inline ssize_t sendfile(int out_fd, int in_fd, off_t* offset, size_t count) {
48  off_t in_out_count = count;
49  int result = sendfile(in_fd, out_fd, *offset, &in_out_count, NULL, 0);
50  if (result == -1) {
51    return -1;
52  }
53  return in_out_count;
54}
55
56// For mincore(3).
57#define _DARWIN_C_SOURCE
58#include <sys/mman.h>
59#undef _DARWIN_C_SOURCE
60static inline int mincore(void* addr, size_t length, unsigned char* vec) {
61  return mincore(addr, length, reinterpret_cast<char*>(vec));
62}
63
64// For statfs(3).
65#include <sys/param.h>
66#include <sys/mount.h>
67
68#else
69
70// Bionic or glibc.
71
72#include <byteswap.h>
73#include <sys/sendfile.h>
74#include <sys/statvfs.h>
75
76#endif
77
78#include <netdb.h>
79#if defined(__BIONIC__)
80extern "C" int android_getaddrinfofornet(const char*, const char*, const struct addrinfo*, unsigned, unsigned, struct addrinfo**);
81#else
82static inline int android_getaddrinfofornet(const char* hostname, const char* servname,
83    const struct addrinfo* hints, unsigned /*netid*/, unsigned /*mark*/, struct addrinfo** res) {
84  return getaddrinfo(hostname, servname, hints, res);
85}
86#endif
87
88#if defined(__GLIBC__) && !defined(__LP64__)
89
90#include <unistd.h>
91
92// 32 bit GLIBC hardcodes a "long int" as the return type for
93// TEMP_FAILURE_RETRY so the return value here gets truncated for
94// functions that return 64 bit types.
95#undef TEMP_FAILURE_RETRY
96#define TEMP_FAILURE_RETRY(exp) ({         \
97    __typeof__(exp) _rc;                   \
98    do {                                   \
99        _rc = (exp);                       \
100    } while (_rc == -1 && errno == EINTR); \
101    _rc; })
102
103#endif  // __GLIBC__ && !__LP64__
104
105#endif  // PORTABILITY_H_included
106