lib/libc/sys/utimensat.c

   1 /*-
   2  * Copyright (c) 2015 Jilles Tjoelker
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include "namespace.h"
  31 #include <sys/stat.h>
  32
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <time.h>
  36 #include "un-namespace.h"
  37
  38 #include "libc_private.h"
  39
  40 int
  41 utimensat(int fd, const char *path, const struct timespec times[2], int flag)
  42 {
  43         struct timeval now, tv[2], *tvp;
  44         struct stat sb;
  45
  46         if (__getosreldate() >= 1100056)
  47                 return (__sys_utimensat(fd, path, times, flag));
  48
  49         if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) {
  50                 errno = EINVAL;
  51                 return (-1);
  52         }
  53         if (times == NULL || (times[0].tv_nsec == UTIME_NOW &&
  54             times[1].tv_nsec == UTIME_NOW))
  55                 tvp = NULL;
  56         else if (times[0].tv_nsec == UTIME_OMIT &&
  57             times[1].tv_nsec == UTIME_OMIT)
  58                 return (0);
  59         else {
  60                 if ((times[0].tv_nsec < 0 || times[0].tv_nsec > 999999999) &&
  61                     times[0].tv_nsec != UTIME_NOW &&
  62                     times[0].tv_nsec != UTIME_OMIT) {
  63                         errno = EINVAL;
  64                         return (-1);
  65                 }
  66                 if ((times[1].tv_nsec < 0 || times[1].tv_nsec > 999999999) &&
  67                     times[1].tv_nsec != UTIME_NOW &&
  68                     times[1].tv_nsec != UTIME_OMIT) {
  69                         errno = EINVAL;
  70                         return (-1);
  71                 }
  72                 tv[0].tv_sec = times[0].tv_sec;
  73                 tv[0].tv_usec = times[0].tv_nsec / 1000;
  74                 tv[1].tv_sec = times[1].tv_sec;
  75                 tv[1].tv_usec = times[1].tv_nsec / 1000;
  76                 tvp = tv;
  77                 if (times[0].tv_nsec == UTIME_OMIT ||
  78                     times[1].tv_nsec == UTIME_OMIT) {
  79                         if (fstatat(fd, path, &sb, flag) == -1)
  80                                 return (-1);
  81                         if (times[0].tv_nsec == UTIME_OMIT) {
  82                                 tv[0].tv_sec = sb.st_atim.tv_sec;
  83                                 tv[0].tv_usec = sb.st_atim.tv_nsec / 1000;
  84                         }
  85                         if (times[1].tv_nsec == UTIME_OMIT) {
  86                                 tv[1].tv_sec = sb.st_mtim.tv_sec;
  87                                 tv[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
  88                         }
  89                 }
  90                 if (times[0].tv_nsec == UTIME_NOW ||
  91                     times[1].tv_nsec == UTIME_NOW) {
  92                         if (gettimeofday(&now, NULL) == -1)
  93                                 return (-1);
  94                         if (times[0].tv_nsec == UTIME_NOW)
  95                                 tv[0] = now;
  96                         if (times[1].tv_nsec == UTIME_NOW)
  97                                 tv[1] = now;
  98                 }
  99         }
 100         if ((flag & AT_SYMLINK_NOFOLLOW) == 0)
 101                 return (futimesat(fd, path, tvp));
 102         else if ((flag & AT_SYMLINK_NOFOLLOW) != 0 &&
 103             (fd == AT_FDCWD || path[0] == '/'))
 104                 return (lutimes(path, tvp));
 105         else {
 106                 errno = ENOTSUP;
 107                 return (-1);
 108         }
 109 }