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