mirror of
https://github.com/coreutils/coreutils.git
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106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* Copyright (C) 1998, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* derived from a function in touch.c */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#undef utime
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#include <sys/types.h>
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#ifdef HAVE_UTIME_H
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# include <utime.h>
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#endif
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#if !HAVE_UTIMES_NULL
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# include <sys/stat.h>
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# include <fcntl.h>
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#endif
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#include <unistd.h>
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#include <errno.h>
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#include "full-write.h"
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#include "safe-read.h"
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/* Some systems (even some that do have <utime.h>) don't declare this
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structure anywhere. */
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#ifndef HAVE_STRUCT_UTIMBUF
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struct utimbuf
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{
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long actime;
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long modtime;
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};
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#endif
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/* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
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interpret it to set the access and modification times of FILE to
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the current time. Return 0 if successful, -1 if not. */
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static int
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utime_null (const char *file)
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{
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#if HAVE_UTIMES_NULL
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return utimes (file, 0);
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#else
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int fd;
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char c;
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int status = 0;
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struct stat st;
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int saved_errno = 0;
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fd = open (file, O_RDWR);
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if (fd < 0
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|| fstat (fd, &st) < 0
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|| safe_read (fd, &c, sizeof c) == SAFE_READ_ERROR
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|| lseek (fd, (off_t) 0, SEEK_SET) < 0
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|| full_write (fd, &c, sizeof c) != sizeof c
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/* Maybe do this -- it's necessary on SunOS 4.1.3 with some combination
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of patches, but that system doesn't use this code: it has utimes.
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|| fsync (fd) < 0
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*/
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|| (st.st_size == 0 && ftruncate (fd, st.st_size) < 0))
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{
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saved_errno = errno;
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status = -1;
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}
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if (0 <= fd)
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{
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if (close (fd) < 0)
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status = -1;
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/* If there was a prior failure, use the saved errno value.
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But if the only failure was in the close, don't change errno. */
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if (saved_errno)
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errno = saved_errno;
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}
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return status;
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#endif
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}
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int
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rpl_utime (const char *file, const struct utimbuf *times)
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{
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if (times)
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return utime (file, times);
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return utime_null (file);
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}
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