mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-13 08:40:07 +00:00
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* futimes -- change access and modification times of open file. Linux version.
|
|
Copyright (C) 2002-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <sysdep.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <utime.h>
|
|
#include <sys/time.h>
|
|
#include <_itoa.h>
|
|
#include <fcntl.h>
|
|
|
|
#include <kernel-features.h>
|
|
|
|
|
|
#if defined __NR_utimensat && !defined __ASSUME_UTIMENSAT
|
|
static int miss_utimensat;
|
|
#endif
|
|
|
|
/* Change the access time of the file associated with FD to TVP[0] and
|
|
the modification time of FILE to TVP[1].
|
|
|
|
Starting with 2.6.22 the Linux kernel has the utimensat syscall which
|
|
can be used to implement futimes. Earlier kernels have no futimes()
|
|
syscall so we use the /proc filesystem. */
|
|
int
|
|
__futimes (int fd, const struct timeval tvp[2])
|
|
{
|
|
/* The utimensat system call expects timespec not timeval. */
|
|
struct timespec ts[2];
|
|
if (tvp != NULL)
|
|
{
|
|
if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
|
|
|| tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
TIMEVAL_TO_TIMESPEC (&tvp[0], &ts[0]);
|
|
TIMEVAL_TO_TIMESPEC (&tvp[1], &ts[1]);
|
|
}
|
|
|
|
#ifdef __ASSUME_UTIMENSAT
|
|
return INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
|
|
#else
|
|
int result;
|
|
# ifdef __NR_utimensat
|
|
if (!__builtin_expect (miss_utimensat, 0))
|
|
{
|
|
result = INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
|
|
if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
|
|
return result;
|
|
|
|
miss_utimensat = 1;
|
|
}
|
|
# endif
|
|
|
|
static const char selffd[] = "/proc/self/fd/";
|
|
char fname[sizeof (selffd) + 3 * sizeof (int)];
|
|
fname[sizeof (fname) - 1] = '\0';
|
|
char *cp = _itoa_word ((unsigned int) fd, fname + sizeof (fname) - 1, 10, 0);
|
|
cp = memcpy (cp - sizeof (selffd) + 1, selffd, sizeof (selffd) - 1);
|
|
|
|
# ifdef __NR_utimes
|
|
result = INLINE_SYSCALL (utimes, 2, cp, tvp);
|
|
# ifndef __ASSUME_UTIMES
|
|
if (result == -1 && errno == ENOSYS)
|
|
# endif
|
|
# endif
|
|
{
|
|
/* The utimes() syscall does not exist or is not available in the
|
|
used kernel. Use utime(). For this we have to convert to the
|
|
data format utime() expects. */
|
|
# ifndef __ASSUME_UTIMES
|
|
struct utimbuf buf;
|
|
struct utimbuf *times;
|
|
|
|
if (tvp != NULL)
|
|
{
|
|
times = &buf;
|
|
buf.actime = tvp[0].tv_sec;
|
|
buf.modtime = tvp[1].tv_sec;
|
|
}
|
|
else
|
|
times = NULL;
|
|
|
|
result = INLINE_SYSCALL (utime, 2, cp, times);
|
|
# endif
|
|
}
|
|
|
|
if (result == -1)
|
|
/* Check for errors that result from failing to find /proc.
|
|
This means we can't do futimes at all, so return ENOSYS
|
|
rather than some confusing error. */
|
|
switch (errno)
|
|
{
|
|
case EACCES:
|
|
if (tvp == NULL) /* Could be a path problem or a file problem. */
|
|
break;
|
|
/*FALLTHROUGH*/
|
|
case ELOOP:
|
|
case ENAMETOOLONG:
|
|
case ENOTDIR:
|
|
__set_errno (ENOSYS);
|
|
break;
|
|
|
|
case ENOENT:
|
|
/* Validate the file descriptor by letting fcntl set errno to
|
|
EBADF if it's bogus. Otherwise it's a /proc issue. */
|
|
# if !defined __NR_fcntl && defined __NR_fcntl64
|
|
# define __NR_fcntl __NR_fcntl64
|
|
# endif
|
|
if (INLINE_SYSCALL (fcntl, 3, fd, F_GETFD, 0) != -1)
|
|
__set_errno (ENOSYS);
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
#endif
|
|
}
|
|
weak_alias (__futimes, futimes)
|