usr/src/lib/libbc/libc/gen/common/opendir.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1995, by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/param.h>
  30 #include <sys/stat.h>
  31 #include <dirent.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34
  35 /*
  36  * open a directory.
  37  */
  38 DIR *
  39 opendir(name)
  40         char *name;
  41 {
  42         register DIR *dirp;
  43         register int fd;
  44         struct stat sb;
  45         extern int errno;
  46         extern char *malloc();
  47         extern int open(), close(), fstat();
  48
  49         if ((fd = open(name, O_RDONLY | O_NDELAY)) == -1)
  50                 return (NULL);
  51         if (fstat(fd, &sb) == -1) {
  52                 (void) close(fd);
  53                 return (NULL);
  54         }
  55         if ((sb.st_mode & S_IFMT) != S_IFDIR) {
  56                 errno = ENOTDIR;
  57                 (void) close(fd);
  58                 return (NULL);
  59         }
  60         if (((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) ||
  61             ((dirp->dd_buf = malloc(sb.st_blksize)) == NULL)) {
  62                 if (dirp)
  63                         free(dirp);
  64                 (void) close(fd);
  65                 return (NULL);
  66         }
  67         dirp->dd_fd = fd;
  68         dirp->dd_loc = 0;
  69         dirp->dd_size = 0;
  70         dirp->dd_bsize = sb.st_blksize;
  71         dirp->dd_off = 0;
  72         (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
  73         return (dirp);
  74 }