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.
fdatasync(int fd)42 static 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>
sendfile(int out_fd,int in_fd,off_t * offset,size_t count)47 static 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
mincore(void * addr,size_t length,unsigned char * vec)60 static 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 #define f_frsize f_bsize // TODO: close enough?
68
69 #else
70
71 // Bionic or glibc.
72
73 #include <byteswap.h>
74 #include <sys/sendfile.h>
75
76 // For statfs(3).
77 #include <sys/vfs.h> // Bionic doesn't have <sys/statvfs.h>
78
79 #endif
80
81 #endif // PORTABILITY_H_included
82