tools/build/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 #include <sys/stat.h>
  29
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #include <time.h>
  33
  34 #ifndef UTIME_NOW
  35 #define UTIME_NOW       -1
  36 #define UTIME_OMIT      -2
  37 #endif
  38
  39 int
  40 utimensat(int fd, const char *path, const struct timespec times[2], int flag)
  41 {
  42         struct timeval now, tv[2], *tvp;
  43         struct stat sb;
  44         int osreldate;
  45
  46         if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) {
  47                 errno = EINVAL;
  48                 return (-1);
  49         }
  50         if (times == NULL || (times[0].tv_nsec == UTIME_NOW &&
  51             times[1].tv_nsec == UTIME_NOW))
  52                 tvp = NULL;
  53         else if (times[0].tv_nsec == UTIME_OMIT &&
  54             times[1].tv_nsec == UTIME_OMIT)
  55                 return (0);
  56         else {
  57                 if ((times[0].tv_nsec < 0 || times[0].tv_nsec > 999999999) &&
  58                     times[0].tv_nsec != UTIME_NOW &&
  59                     times[0].tv_nsec != UTIME_OMIT) {
  60                         errno = EINVAL;
  61                         return (-1);
  62                 }
  63                 if ((times[1].tv_nsec < 0 || times[1].tv_nsec > 999999999) &&
  64                     times[1].tv_nsec != UTIME_NOW &&
  65                     times[1].tv_nsec != UTIME_OMIT) {
  66                         errno = EINVAL;
  67                         return (-1);
  68                 }
  69                 tv[0].tv_sec = times[0].tv_sec;
  70                 tv[0].tv_usec = times[0].tv_nsec / 1000;
  71                 tv[1].tv_sec = times[1].tv_sec;
  72                 tv[1].tv_usec = times[1].tv_nsec / 1000;
  73                 tvp = tv;
  74                 if (times[0].tv_nsec == UTIME_OMIT ||
  75                     times[1].tv_nsec == UTIME_OMIT) {
  76                         if (fstatat(fd, path, &sb, flag) == -1)
  77                                 return (-1);
  78                         if (times[0].tv_nsec == UTIME_OMIT) {
  79                                 tv[0].tv_sec = sb.st_atim.tv_sec;
  80                                 tv[0].tv_usec = sb.st_atim.tv_nsec / 1000;
  81                         }
  82                         if (times[1].tv_nsec == UTIME_OMIT) {
  83                                 tv[1].tv_sec = sb.st_mtim.tv_sec;
  84                                 tv[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
  85                         }
  86                 }
  87                 if (times[0].tv_nsec == UTIME_NOW ||
  88                     times[1].tv_nsec == UTIME_NOW) {
  89                         if (gettimeofday(&now, NULL) == -1)
  90                                 return (-1);
  91                         if (times[0].tv_nsec == UTIME_NOW)
  92                                 tv[0] = now;
  93                         if (times[1].tv_nsec == UTIME_NOW)
  94                                 tv[1] = now;
  95                 }
  96         }
  97         if ((flag & AT_SYMLINK_NOFOLLOW) == 0)
  98                 return (futimesat(fd, path, tvp));
  99         else if ((flag & AT_SYMLINK_NOFOLLOW) != 0 &&
 100             (fd == AT_FDCWD || path[0] == '/'))
 101                 return (lutimes(path, tvp));
 102         else {
 103                 errno = ENOTSUP;
 104                 return (-1);
 105         }
 106 }