gen/FreeBSD/rewinddir.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)rewinddir.c 8.1 (Berkeley) 6/8/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include "namespace.h"
  37 #include <sys/types.h>
  38 #include <dirent.h>
  39 #include <pthread.h>
  40 #include <unistd.h>
  41 #include "un-namespace.h"
  42
  43 #include "libc_private.h"
  44 #include "telldir.h"
  45
  46 void
  47 rewinddir(DIR *dirp)
  48 {
  49
  50         if (__isthreaded)
  51                 _pthread_mutex_lock(&dirp->dd_lock);
  52         dirp->dd_flags &= ~(__DTF_SKIPREAD | __DTF_ATEND); /* current contents are invalid */
  53         if (dirp->dd_flags & __DTF_READALL)
  54                 _filldir(dirp, false);
  55         else {
  56                 (void) lseek(dirp->dd_fd, 0, SEEK_SET);
  57 #if __DARWIN_64_BIT_INO_T
  58                 dirp->dd_td->seekoff = 0;
  59 #else /* !__DARWIN_64_BIT_INO_T */
  60                 dirp->dd_seek = 0;
  61 #endif /* __DARWIN_64_BIT_INO_T */
  62         }
  63         dirp->dd_loc = 0;
  64         _reclaim_telldir(dirp);
  65         if (__isthreaded)
  66                 _pthread_mutex_unlock(&dirp->dd_lock);
  67 }