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opendir.c revision 1.1.2.2 
      1  1.1.2.2  perry /*	$NetBSD: opendir.c,v 1.1.2.2 1999/06/21 13:38:00 perry Exp $	*/
      2  1.1.2.2  perry 
      3  1.1.2.2  perry /*
      4  1.1.2.2  perry  * Copyright (c) 1983, 1993
      5  1.1.2.2  perry  *	The Regents of the University of California.  All rights reserved.
      6  1.1.2.2  perry  *
      7  1.1.2.2  perry  * Redistribution and use in source and binary forms, with or without
      8  1.1.2.2  perry  * modification, are permitted provided that the following conditions
      9  1.1.2.2  perry  * are met:
     10  1.1.2.2  perry  * 1. Redistributions of source code must retain the above copyright
     11  1.1.2.2  perry  *    notice, this list of conditions and the following disclaimer.
     12  1.1.2.2  perry  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1.2.2  perry  *    notice, this list of conditions and the following disclaimer in the
     14  1.1.2.2  perry  *    documentation and/or other materials provided with the distribution.
     15  1.1.2.2  perry  * 3. All advertising materials mentioning features or use of this software
     16  1.1.2.2  perry  *    must display the following acknowledgement:
     17  1.1.2.2  perry  *	This product includes software developed by the University of
     18  1.1.2.2  perry  *	California, Berkeley and its contributors.
     19  1.1.2.2  perry  * 4. Neither the name of the University nor the names of its contributors
     20  1.1.2.2  perry  *    may be used to endorse or promote products derived from this software
     21  1.1.2.2  perry  *    without specific prior written permission.
     22  1.1.2.2  perry  *
     23  1.1.2.2  perry  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1.2.2  perry  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1.2.2  perry  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1.2.2  perry  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1.2.2  perry  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1.2.2  perry  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1.2.2  perry  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1.2.2  perry  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1.2.2  perry  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1.2.2  perry  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1.2.2  perry  * SUCH DAMAGE.
     34  1.1.2.2  perry  */
     35  1.1.2.2  perry 
     36  1.1.2.2  perry #include <sys/param.h>
     37  1.1.2.2  perry #include <sys/mount.h>
     38  1.1.2.2  perry #include <sys/stat.h>
     39  1.1.2.2  perry 
     40  1.1.2.2  perry #include <dirent.h>
     41  1.1.2.2  perry #include <errno.h>
     42  1.1.2.2  perry #include <fcntl.h>
     43  1.1.2.2  perry #include <stdlib.h>
     44  1.1.2.2  perry #include <string.h>
     45  1.1.2.2  perry #include <unistd.h>
     46  1.1.2.2  perry 
     47  1.1.2.2  perry /*
     48  1.1.2.2  perry  * Open a directory.
     49  1.1.2.2  perry  */
     50  1.1.2.2  perry DIR *
     51  1.1.2.2  perry opendir(name)
     52  1.1.2.2  perry 	const char *name;
     53  1.1.2.2  perry {
     54  1.1.2.2  perry 	DIR *dirp;
     55  1.1.2.2  perry 	int fd;
     56  1.1.2.2  perry 	struct stat sb;
     57  1.1.2.2  perry 
     58  1.1.2.2  perry 	if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1)
     59  1.1.2.2  perry 		return (NULL);
     60  1.1.2.2  perry 	if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) {
     61  1.1.2.2  perry 		errno = ENOTDIR;
     62  1.1.2.2  perry 		close(fd);
     63  1.1.2.2  perry 		return (NULL);
     64  1.1.2.2  perry 	}
     65  1.1.2.2  perry 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
     66  1.1.2.2  perry 	    (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
     67  1.1.2.2  perry 		close(fd);
     68  1.1.2.2  perry 		return (NULL);
     69  1.1.2.2  perry 	}
     70  1.1.2.2  perry 
     71  1.1.2.2  perry 	/*
     72  1.1.2.2  perry 	 * Determine whether this directory is the top of a union stack.
     73  1.1.2.2  perry 	 * (Never is on a ramdisk)
     74  1.1.2.2  perry 	 */
     75  1.1.2.2  perry 	{
     76  1.1.2.2  perry 		dirp->dd_len = DIRBLKSIZ;
     77  1.1.2.2  perry 		dirp->dd_buf = malloc((size_t)dirp->dd_len);
     78  1.1.2.2  perry 		if (dirp->dd_buf == NULL) {
     79  1.1.2.2  perry 			free(dirp);
     80  1.1.2.2  perry 			close (fd);
     81  1.1.2.2  perry 			return (NULL);
     82  1.1.2.2  perry 		}
     83  1.1.2.2  perry 		dirp->dd_seek = 0;
     84  1.1.2.2  perry 	}
     85  1.1.2.2  perry 
     86  1.1.2.2  perry 	dirp->dd_loc = 0;
     87  1.1.2.2  perry 	dirp->dd_fd = fd;
     88  1.1.2.2  perry 	dirp->dd_flags = DTF_HIDEW;
     89  1.1.2.2  perry 
     90  1.1.2.2  perry 	/*
     91  1.1.2.2  perry 	 * Set up seek point for rewinddir.
     92  1.1.2.2  perry 	 */
     93  1.1.2.2  perry 	dirp->dd_rewind = telldir(dirp);
     94  1.1.2.2  perry 
     95  1.1.2.2  perry 	return (dirp);
     96  1.1.2.2  perry }
     97