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 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 /*
33 * telldir -- C library extension routine
34 */
35
36 #include <sys/isa_defs.h>
37
38 #if !defined(_LP64)
39 #pragma weak _telldir64 = telldir64
40 #endif
41 #pragma weak _telldir = telldir
42
43 #include "lint.h"
44 #include "libc.h"
45 #include <mtlib.h>
46 #include <dirent.h>
47 #include <errno.h>
48 #include <limits.h>
49 #include <fcntl.h>
50 #include <unistd.h>
51
52 #ifdef _LP64
53
54 long
telldir(DIR * dirp)55 telldir(DIR *dirp)
56 {
57 private_DIR *pdirp = (private_DIR *)dirp;
58 dirent_t *dp;
59 off_t off = 0;
60
61 lmutex_lock(&pdirp->dd_lock);
62 /* if at beginning of dir, return 0 */
63 if (lseek(dirp->dd_fd, 0, SEEK_CUR) != 0) {
64 dp = (dirent_t *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);
65 off = dp->d_off;
66 }
67 lmutex_unlock(&pdirp->dd_lock);
68 return (off);
69 }
70
71 #else
72
73 /*
74 * Note: Instead of making this function static, we reduce it to local
75 * scope in the mapfile. That allows the linker to prevent it from
76 * appearing in the .SUNW_dynsymsort section.
77 */
78 off64_t
telldir64(DIR * dirp)79 telldir64(DIR *dirp)
80 {
81 private_DIR *pdirp = (private_DIR *)(uintptr_t)dirp;
82 dirent64_t *dp64;
83 off64_t off = 0;
84
85 lmutex_lock(&pdirp->dd_lock);
86 /* if at beginning of dir, return 0 */
87 if (lseek64(dirp->dd_fd, 0, SEEK_CUR) != 0) {
88 dp64 = (dirent64_t *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);
89 /* was converted by readdir and needs to be reversed */
90 if (dp64->d_ino == (ino64_t)-1) {
91 dirent_t *dp32;
92
93 dp32 = (dirent_t *)((uintptr_t)dp64 + sizeof (ino64_t));
94 dp64->d_ino = (ino64_t)dp32->d_ino;
95 dp64->d_off = (off64_t)dp32->d_off;
96 dp64->d_reclen = (unsigned short)(dp32->d_reclen +
97 ((char *)&dp64->d_off - (char *)dp64));
98 }
99 off = dp64->d_off;
100 }
101 lmutex_unlock(&pdirp->dd_lock);
102 return (off);
103 }
104
105 long
telldir(DIR * dirp)106 telldir(DIR *dirp)
107 {
108 off64_t off;
109
110 off = telldir64(dirp);
111
112 /*
113 * Make sure that the offset fits in 32 bits.
114 */
115 if ((long)off != off && (uint64_t)off > (uint64_t)UINT32_MAX) {
116 errno = EOVERFLOW;
117 return (-1);
118 }
119 return ((long)off);
120 }
121
122 #endif /* _LP64 */
123