futimens.c

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/* Change access and modification times of open file.  Linux version.
   Copyright (C) 2007 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <sysdep.h>


/* Change the access time of the file associated with FD to TSP[0] and
   the modification time of FILE to TSP[1].

   Starting with 2.6.22 the Linux kernel has the utimensat syscall which
   can be used to implement futimens.  */
int
futimens (int fd, const struct timespec tsp[2])
{
#ifdef __NR_utimensat
  return INLINE_SYSCALL (utimensat, 4, fd, NULL, tsp, 0);
#else
  __set_errno (ENOSYS);
  return -1;
#endif
}
#ifndef __NR_utimensat
stub_warning (futimens)
# include <stub-tag.h>
#endif