mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-14 04:18:48 +08:00
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/* Copyright (C) 1998, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 2, or (at your option) any
|
|
later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
/* derived from a function in touch.c */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
#undef utime
|
|
|
|
#include <sys/types.h>
|
|
|
|
#ifdef HAVE_UTIME_H
|
|
# include <utime.h>
|
|
#endif
|
|
|
|
#if !HAVE_UTIMES_NULL
|
|
# include <sys/stat.h>
|
|
# include <fcntl.h>
|
|
#endif
|
|
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
#include "full-write.h"
|
|
#include "safe-read.h"
|
|
|
|
/* Some systems (even some that do have <utime.h>) don't declare this
|
|
structure anywhere. */
|
|
#ifndef HAVE_STRUCT_UTIMBUF
|
|
struct utimbuf
|
|
{
|
|
long actime;
|
|
long modtime;
|
|
};
|
|
#endif
|
|
|
|
/* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
|
|
interpret it to set the access and modification times of FILE to
|
|
the current time. Return 0 if successful, -1 if not. */
|
|
|
|
static int
|
|
utime_null (const char *file)
|
|
{
|
|
#if HAVE_UTIMES_NULL
|
|
return utimes (file, 0);
|
|
#else
|
|
int fd;
|
|
char c;
|
|
int status = 0;
|
|
struct stat st;
|
|
int saved_errno = 0;
|
|
|
|
fd = open (file, O_RDWR);
|
|
if (fd < 0
|
|
|| fstat (fd, &st) < 0
|
|
|| safe_read (fd, &c, sizeof c) == SAFE_READ_ERROR
|
|
|| lseek (fd, (off_t) 0, SEEK_SET) < 0
|
|
|| full_write (fd, &c, sizeof c) != sizeof c
|
|
/* Maybe do this -- it's necessary on SunOS 4.1.3 with some combination
|
|
of patches, but that system doesn't use this code: it has utimes.
|
|
|| fsync (fd) < 0
|
|
*/
|
|
|| (st.st_size == 0 && ftruncate (fd, st.st_size) < 0))
|
|
{
|
|
saved_errno = errno;
|
|
status = -1;
|
|
}
|
|
|
|
if (0 <= fd)
|
|
{
|
|
if (close (fd) < 0)
|
|
status = -1;
|
|
|
|
/* If there was a prior failure, use the saved errno value.
|
|
But if the only failure was in the close, don't change errno. */
|
|
if (saved_errno)
|
|
errno = saved_errno;
|
|
}
|
|
|
|
return status;
|
|
#endif
|
|
}
|
|
|
|
int
|
|
rpl_utime (const char *file, const struct utimbuf *times)
|
|
{
|
|
if (times)
|
|
return utime (file, times);
|
|
|
|
return utime_null (file);
|
|
}
|