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      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 (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 /*
     30  * fdopendir, dirfd -- C library extension routines
     31  *
     32  * We use lmalloc()/lfree() rather than malloc()/free() in
     33  * order to allow opendir()/readdir()/closedir() to be called
     34  * while holding internal libc locks.
     35  */
     36 
     37 #pragma weak _fdopendir = fdopendir
     38 
     39 #include "lint.h"
     40 #include <mtlib.h>
     41 #include <dirent.h>
     42 #include <sys/stat.h>
     43 #include <fcntl.h>
     44 #include <stdlib.h>
     45 #include <unistd.h>
     46 #include <errno.h>
     47 #include "libc.h"
     48 
     49 DIR *
     50 fdopendir(int fd)
     51 {
     52 	private_DIR *pdirp = lmalloc(sizeof (*pdirp));
     53 	DIR *dirp = (DIR *)pdirp;
     54 	void *buf = lmalloc(DIRBUF);
     55 	int error = 0;
     56 	struct stat64 sbuf;
     57 
     58 	if (pdirp == NULL || buf == NULL)
     59 		goto fail;
     60 	/*
     61 	 * POSIX mandated behavior
     62 	 * close on exec if using file descriptor
     63 	 */
     64 	if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
     65 		goto fail;
     66 	if (fstat64(fd, &sbuf) < 0)
     67 		goto fail;
     68 	if ((sbuf.st_mode & S_IFMT) != S_IFDIR) {
     69 		error = ENOTDIR;
     70 		goto fail;
     71 	}
     72 	dirp->dd_buf = buf;
     73 	dirp->dd_fd = fd;
     74 	dirp->dd_loc = 0;
     75 	dirp->dd_size = 0;
     76 	(void) mutex_init(&pdirp->dd_lock, USYNC_THREAD, NULL);
     77 	return (dirp);
     78 
     79 fail:
     80 	if (pdirp != NULL)
     81 		lfree(pdirp, sizeof (*pdirp));
     82 	if (buf != NULL)
     83 		lfree(buf, DIRBUF);
     84 	if (error)
     85 		errno = error;
     86 	return (NULL);
     87 }
     88 
     89 int
     90 dirfd(DIR *dirp)
     91 {
     92 	return (dirp->dd_fd);
     93 }
     94