1 | /* Copyright (C) 2007-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <fcntl.h> |
19 | #include <kernel-features.h> |
20 | #include <sysdep.h> |
21 | |
22 | #define posix_fallocate static internal_fallocate |
23 | #include <sysdeps/posix/posix_fallocate.c> |
24 | #undef posix_fallocate |
25 | |
26 | /* The alpha architecture introduced the fallocate system call in |
27 | 2.6.33-rc1, so we still need the fallback code. */ |
28 | #if !defined __ASSUME_FALLOCATE && defined __NR_fallocate |
29 | static int __have_fallocate; |
30 | #endif |
31 | |
32 | |
33 | /* Reserve storage for the data of the file associated with FD. */ |
34 | int |
35 | posix_fallocate (int fd, __off_t offset, __off_t len) |
36 | { |
37 | #ifdef __NR_fallocate |
38 | # ifndef __ASSUME_FALLOCATE |
39 | if (__glibc_likely (__have_fallocate >= 0)) |
40 | # endif |
41 | { |
42 | INTERNAL_SYSCALL_DECL (err); |
43 | # ifdef INTERNAL_SYSCALL_TYPES |
44 | int res = INTERNAL_SYSCALL_TYPES (fallocate, err, 4, int, fd, |
45 | int, 0, off_t, offset, |
46 | off_t, len); |
47 | # else |
48 | int res = INTERNAL_SYSCALL (fallocate, err, 4, fd, 0, offset, len); |
49 | # endif |
50 | |
51 | if (! INTERNAL_SYSCALL_ERROR_P (res, err)) |
52 | return 0; |
53 | |
54 | # ifndef __ASSUME_FALLOCATE |
55 | if (__glibc_unlikely (INTERNAL_SYSCALL_ERRNO (res, err) == ENOSYS)) |
56 | __have_fallocate = -1; |
57 | else |
58 | # endif |
59 | if (INTERNAL_SYSCALL_ERRNO (res, err) != EOPNOTSUPP) |
60 | return INTERNAL_SYSCALL_ERRNO (res, err); |
61 | } |
62 | #endif |
63 | |
64 | return internal_fallocate (fd, offset, len); |
65 | } |
66 | weak_alias (posix_fallocate, posix_fallocate64) |
67 | |