1 | /* 64-bit preadv. |
2 | Copyright (C) 2012-2016 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <stddef.h> |
21 | #include <sys/param.h> |
22 | /* Hide the preadv64 declaration. */ |
23 | #define preadv64 __redirect_preadv64 |
24 | #include <sys/uio.h> |
25 | |
26 | #include <sysdep-cancel.h> |
27 | #include <sys/syscall.h> |
28 | #include <kernel-features.h> |
29 | |
30 | #ifndef __ASSUME_PREADV |
31 | static ssize_t __atomic_preadv_replacement (int, const struct iovec *, |
32 | int, off_t) internal_function; |
33 | #endif |
34 | |
35 | ssize_t |
36 | preadv (int fd, const struct iovec *vector, int count, off_t offset) |
37 | { |
38 | #ifdef __NR_preadv |
39 | ssize_t result; |
40 | |
41 | result = SYSCALL_CANCEL (preadv, fd, vector, count, offset); |
42 | # ifdef __ASSUME_PREADV |
43 | return result; |
44 | # endif |
45 | #endif |
46 | |
47 | #ifndef __ASSUME_PREADV |
48 | # ifdef __NR_preadv |
49 | if (result >= 0 || errno != ENOSYS) |
50 | return result; |
51 | # endif |
52 | |
53 | return __atomic_preadv_replacement (fd, vector, count, offset); |
54 | #endif |
55 | } |
56 | #undef preadv64 |
57 | strong_alias (preadv, preadv64) |
58 | |
59 | #ifndef __ASSUME_PREADV |
60 | # define PREADV static internal_function __atomic_preadv_replacement |
61 | # define PREAD __pread |
62 | # define OFF_T off_t |
63 | # include <sysdeps/posix/preadv.c> |
64 | #endif |
65 | |