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 2004 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 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 /* 34 * telldir -- C library extension routine 35 */ 36 37 #include <sys/isa_defs.h> 38 39 #if !defined(_LP64) 40 #pragma weak telldir64 = _telldir64 41 #endif 42 #pragma weak telldir = _telldir 43 44 #include "synonyms.h" 45 #include <mtlib.h> 46 #include <sys/types.h> 47 #include <dirent.h> 48 #include <thread.h> 49 #include <errno.h> 50 #include <limits.h> 51 #include <synch.h> 52 #include <fcntl.h> 53 #include <stdio.h> 54 #include <unistd.h> 55 #include <inttypes.h> 56 57 extern mutex_t _dirent_lock; 58 59 #ifdef _LP64 60 61 long 62 telldir(DIR *dirp) 63 { 64 struct dirent *dp; 65 off_t off = 0; 66 67 lmutex_lock(&_dirent_lock); 68 /* if at beginning of dir, return 0 */ 69 if (lseek(dirp->dd_fd, 0, SEEK_CUR) != 0) { 70 dp = (struct dirent *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]); 71 off = dp->d_off; 72 } 73 lmutex_unlock(&_dirent_lock); 74 return (off); 75 } 76 77 #else 78 79 static off64_t 80 telldir64(DIR *dirp) 81 { 82 struct dirent64 *dp64; 83 off64_t off = 0; 84 85 lmutex_lock(&_dirent_lock); 86 /* if at beginning of dir, return 0 */ 87 if (lseek64(dirp->dd_fd, 0, SEEK_CUR) != 0) { 88 dp64 = (struct dirent64 *) 89 (uintptr_t)(&dirp->dd_buf[dirp->dd_loc]); 90 /* was converted by readdir and needs to be reversed */ 91 if (dp64->d_ino == (ino64_t)-1) { 92 struct dirent *dp32; 93 94 dp32 = (struct dirent *) 95 ((uintptr_t)dp64 + sizeof (ino64_t)); 96 dp64->d_ino = (ino64_t)dp32->d_ino; 97 dp64->d_off = (off64_t)dp32->d_off; 98 dp64->d_reclen = (unsigned short)(dp32->d_reclen + 99 ((char *)&dp64->d_off - (char *)dp64)); 100 } 101 off = dp64->d_off; 102 } 103 lmutex_unlock(&_dirent_lock); 104 return (off); 105 } 106 107 long 108 telldir(DIR *dirp) 109 { 110 off64_t off; 111 112 off = telldir64(dirp); 113 114 /* 115 * Make sure that the offset fits in 32 bits. 116 */ 117 if ((long)off != off && 118 (uint64_t)off > (uint64_t)UINT32_MAX) { 119 errno = EOVERFLOW; 120 return (-1); 121 } 122 return ((long)off); 123 } 124 125 #endif /* _LP64 */ 126