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 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 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 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