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 /*
28 * fdopendir, dirfd -- C library extension routines
29 *
30 * We use lmalloc()/lfree() rather than malloc()/free() in
31 * order to allow opendir()/readdir()/closedir() to be called
32 * while holding internal libc locks.
33 */
34
35 #pragma weak _fdopendir = fdopendir
36
37 #include "lint.h"
38 #include <mtlib.h>
39 #include <dirent.h>
40 #include <sys/stat.h>
41 #include <fcntl.h>
42 #include <stdlib.h>
43 #include <unistd.h>
44 #include <errno.h>
45 #include "libc.h"
46
47 DIR *
fdopendir(int fd)48 fdopendir(int fd)
49 {
50 private_DIR *pdirp = lmalloc(sizeof (*pdirp));
51 DIR *dirp = (DIR *)pdirp;
52 void *buf = lmalloc(DIRBUF);
53 int error = 0;
54 struct stat64 sbuf;
55
56 if (pdirp == NULL || buf == NULL)
57 goto fail;
58 /*
59 * POSIX mandated behavior
60 * close on exec if using file descriptor
61 */
62 if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
63 goto fail;
64 if (fstat64(fd, &sbuf) < 0)
65 goto fail;
66 if ((sbuf.st_mode & S_IFMT) != S_IFDIR) {
67 error = ENOTDIR;
68 goto fail;
69 }
70 dirp->dd_buf = buf;
71 dirp->dd_fd = fd;
72 dirp->dd_loc = 0;
73 dirp->dd_size = 0;
74 (void) mutex_init(&pdirp->dd_lock, USYNC_THREAD, NULL);
75 return (dirp);
76
77 fail:
78 if (pdirp != NULL)
79 lfree(pdirp, sizeof (*pdirp));
80 if (buf != NULL)
81 lfree(buf, DIRBUF);
82 if (error)
83 errno = error;
84 return (NULL);
85 }
86
87 int
dirfd(DIR * dirp)88 dirfd(DIR *dirp)
89 {
90 return (dirp->dd_fd);
91 }
92