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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
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/* Copyright (C) 2005 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 <fcntl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <utime.h>
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#include <sys/time.h>
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#include <sysdep.h>
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#include "kernel-features.h"
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/* Change the access time of FILE relative to FD to TVP[0] and
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the modification time of FILE to TVP[1]. */
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int
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futimesat (fd, file, tvp)
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int fd;
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const char *file;
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const struct timeval tvp[2];
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{
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char *buf = NULL;
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if (fd != AT_FDCWD && file[0] != '/')
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{
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size_t filelen = strlen (file);
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static const char procfd[] = "/proc/self/fd/%d/%s";
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/* Buffer for the path name we are going to use. It consists of
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- the string /proc/self/fd/
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- the file descriptor number
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- the file name provided.
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The final NUL is included in the sizeof. A bit of overhead
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due to the format elements compensates for possible negative
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numbers. */
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size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
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buf = alloca (buflen);
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__snprintf (buf, buflen, procfd, fd, file);
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file = buf;
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}
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int result;
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INTERNAL_SYSCALL_DECL (err);
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#ifdef __NR_utimes
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result = INTERNAL_SYSCALL (utimes, err, 2, file, tvp);
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if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
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return result;
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# ifndef __ASSUME_UTIMES
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if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
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goto fail;
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# endif
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#endif
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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 tmp;
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struct utimbuf *times;
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if (tvp != NULL)
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{
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times = &tmp;
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tmp.actime = tvp[0].tv_sec + tvp[0].tv_usec / 1000000;
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tmp.modtime = tvp[1].tv_sec + tvp[1].tv_usec / 1000000;
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}
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else
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times = NULL;
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result = INTERNAL_SYSCALL (utime, err, 2, file, times);
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if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
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return result;
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fail:
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#endif
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__atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);
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return -1;
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}
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