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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* futimes -- change access and modification times of open file. Linux version.
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Copyright (C) 2002-2013 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, see
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<http://www.gnu.org/licenses/>. */
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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 <time.h>
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#include <utime.h>
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#include <sys/time.h>
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#include <_itoa.h>
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#include <fcntl.h>
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#include <kernel-features.h>
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#if defined __NR_utimensat && !defined __ASSUME_UTIMENSAT
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static int miss_utimensat;
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#endif
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/* Change the access time of the file associated with FD to TVP[0] and
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the modification time of FILE to TVP[1].
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Starting with 2.6.22 the Linux kernel has the utimensat syscall which
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can be used to implement futimes. Earlier kernels have no futimes()
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syscall so we use the /proc 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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/* The utimensat system call expects timespec not timeval. */
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struct timespec ts[2];
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if (tvp != NULL)
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{
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if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
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|| tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
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{
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__set_errno (EINVAL);
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return -1;
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}
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TIMEVAL_TO_TIMESPEC (&tvp[0], &ts[0]);
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TIMEVAL_TO_TIMESPEC (&tvp[1], &ts[1]);
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}
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#ifdef __ASSUME_UTIMENSAT
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return INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
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#else
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int result;
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# ifdef __NR_utimensat
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if (!__builtin_expect (miss_utimensat, 0))
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{
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result = INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
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if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
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return result;
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miss_utimensat = 1;
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}
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# endif
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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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# 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;
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buf.modtime = tvp[1].tv_sec;
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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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#endif
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}
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weak_alias (__futimes, futimes)
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