1 /* futimes -- change access and modification times of open file. Linux version.
2 Copyright (C) 2002,2003,2005,2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <stdio-common/_itoa.h>
28 #include <kernel-features.h>
30 /* Change the access time of FILE to TVP[0] and
31 the modification time of FILE to TVP[1], but do not follow symlinks.
33 The Linux kernel has no futimes() syscall so we use the /proc
36 __futimes (int fd
, const struct timeval tvp
[2])
38 static const char selffd
[] = "/proc/self/fd/";
39 char fname
[sizeof (selffd
) + 3 * sizeof (int)];
40 fname
[sizeof (fname
) - 1] = '\0';
41 char *cp
= _itoa_word ((unsigned int) fd
, fname
+ sizeof (fname
) - 1, 10, 0);
42 cp
= memcpy (cp
- sizeof (selffd
) + 1, selffd
, sizeof (selffd
) - 1);
46 result
= INLINE_SYSCALL (utimes
, 2, cp
, tvp
);
47 # ifndef __ASSUME_UTIMES
48 if (result
== -1 && errno
== ENOSYS
)
52 /* The utimes() syscall does not exist or is not available in the
53 used kernel. Use utime(). For this we have to convert to the
54 data format utime() expects. */
55 #ifndef __ASSUME_UTIMES
57 struct utimbuf
*times
;
62 buf
.actime
= tvp
[0].tv_sec
+ (tvp
[0].tv_usec
+ 500000) / 1000000;
63 buf
.modtime
= tvp
[1].tv_sec
+ (tvp
[1].tv_usec
+ 500000) / 1000000;
68 result
= INLINE_SYSCALL (utime
, 2, cp
, times
);
73 /* Check for errors that result from failing to find /proc.
74 This means we can't do futimes at all, so return ENOSYS
75 rather than some confusing error. */
79 if (tvp
== NULL
) /* Could be a path problem or a file problem. */
89 /* Validate the file descriptor by letting fcntl set errno to
90 EBADF if it's bogus. Otherwise it's a /proc issue. */
91 #if !defined __NR_fcntl && defined __NR_fcntl64
92 # define __NR_fcntl __NR_fcntl64
94 if (INLINE_SYSCALL (fcntl
, 3, fd
, F_GETFD
, 0) != -1)
101 weak_alias (__futimes
, futimes
)