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102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* futimes -- change access and modification times of open file. Linux version.
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Copyright (C) 2002,2003,2005,2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include <sysdep.h>
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#include <string.h>
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#include <utime.h>
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#include <sys/time.h>
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#include <stdio-common/_itoa.h>
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#include <fcntl.h>
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#include <kernel-features.h>
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/* Change the access time of FILE to TVP[0] and
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the modification time of FILE to TVP[1], but do not follow symlinks.
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The Linux kernel has no futimes() syscall so we use the /proc
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filesystem. */
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int
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__futimes (int fd, const struct timeval tvp[2])
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{
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static const char selffd[] = "/proc/self/fd/";
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char fname[sizeof (selffd) + 3 * sizeof (int)];
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fname[sizeof (fname) - 1] = '\0';
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char *cp = _itoa_word ((unsigned int) fd, fname + sizeof (fname) - 1, 10, 0);
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cp = memcpy (cp - sizeof (selffd) + 1, selffd, sizeof (selffd) - 1);
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int result;
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#ifdef __NR_utimes
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result = INLINE_SYSCALL (utimes, 2, cp, tvp);
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# ifndef __ASSUME_UTIMES
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if (result == -1 && errno == ENOSYS)
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# endif
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#endif
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{
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/* The utimes() syscall does not exist or is not available in the
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used kernel. Use utime(). For this we have to convert to the
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data format utime() expects. */
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#ifndef __ASSUME_UTIMES
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struct utimbuf buf;
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struct utimbuf *times;
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if (tvp != NULL)
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{
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times = &buf;
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buf.actime = tvp[0].tv_sec + (tvp[0].tv_usec + 500000) / 1000000;
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buf.modtime = tvp[1].tv_sec + (tvp[1].tv_usec + 500000) / 1000000;
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}
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else
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times = NULL;
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result = INLINE_SYSCALL (utime, 2, cp, times);
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#endif
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}
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if (result == -1)
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/* Check for errors that result from failing to find /proc.
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This means we can't do futimes at all, so return ENOSYS
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rather than some confusing error. */
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switch (errno)
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{
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case EACCES:
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if (tvp == NULL) /* Could be a path problem or a file problem. */
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break;
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/*FALLTHROUGH*/
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case ELOOP:
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case ENAMETOOLONG:
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case ENOTDIR:
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__set_errno (ENOSYS);
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break;
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case ENOENT:
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/* Validate the file descriptor by letting fcntl set errno to
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EBADF if it's bogus. Otherwise it's a /proc issue. */
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#if !defined __NR_fcntl && defined __NR_fcntl64
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# define __NR_fcntl __NR_fcntl64
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#endif
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if (INLINE_SYSCALL (fcntl, 3, fd, F_GETFD, 0) != -1)
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__set_errno (ENOSYS);
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break;
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}
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return result;
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}
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weak_alias (__futimes, futimes)
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