mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* futimes -- change access and modification times of open file. Linux version.
|
|
Copyright (C) 2002, 2003, 2005 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <sysdep.h>
|
|
#include <string.h>
|
|
#include <utime.h>
|
|
#include <sys/time.h>
|
|
#include <stdio-common/_itoa.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "kernel-features.h"
|
|
|
|
/* Change the access time of FILE to TVP[0] and
|
|
the modification time of FILE to TVP[1], but do not follow symlinks.
|
|
|
|
The Linux kernel has no futimes() syscall so we use the /proc
|
|
filesystem. */
|
|
int
|
|
__futimes (int fd, const struct timeval tvp[2])
|
|
{
|
|
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);
|
|
|
|
int result;
|
|
#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 + (tvp[0].tv_usec + 500000) / 1000000;
|
|
buf.modtime = tvp[1].tv_sec + (tvp[1].tv_usec + 500000) / 1000000;
|
|
}
|
|
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 (INLINE_SYSCALL (fcntl, 3, fd, F_GETFD, 0) != -1)
|
|
__set_errno (ENOSYS);
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
weak_alias (__futimes, futimes)
|