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
29static int __have_fallocate;
30#endif
31
32
33/* Reserve storage for the data of the file associated with FD. */
34int
35posix_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}
66weak_alias (posix_fallocate, posix_fallocate64)
67