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 * readdir_r -- C library extension routine 32 */ 33 34 #include <sys/feature_tests.h> 35 36 #if !defined(_LP64) 37 #pragma weak _readdir64_r = readdir64_r 38 #endif 39 40 #include "lint.h" 41 #include "libc.h" 42 #include <mtlib.h> 43 #include <unistd.h> 44 #include <dirent.h> 45 #include <string.h> 46 #include <limits.h> 47 #include <errno.h> 48 49 #ifdef _LP64 50 51 /* 52 * POSIX.1c standard version of the thread function readdir_r. 53 */ 54 55 int 56 readdir_r(DIR *dirp, dirent_t *entry, dirent_t **result) 57 { 58 private_DIR *pdirp = (private_DIR *)dirp; 59 dirent_t *dp; /* -> directory data */ 60 int saveloc = 0; 61 62 lmutex_lock(&pdirp->dd_lock); 63 if (dirp->dd_size != 0) { 64 dp = (dirent_t *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 65 saveloc = dirp->dd_loc; /* save for possible EOF */ 66 dirp->dd_loc += (int)dp->d_reclen; 67 } 68 69 if (dirp->dd_loc >= dirp->dd_size) 70 dirp->dd_loc = dirp->dd_size = 0; 71 72 if (dirp->dd_size == 0 && /* refill buffer */ 73 (dirp->dd_size = getdents(dirp->dd_fd, 74 (dirent_t *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) { 75 if (dirp->dd_size == 0) { /* This means EOF */ 76 dirp->dd_loc = saveloc; /* so save for telldir */ 77 lmutex_unlock(&pdirp->dd_lock); 78 *result = NULL; 79 return (0); 80 } 81 lmutex_unlock(&pdirp->dd_lock); 82 *result = NULL; 83 return (errno); /* error */ 84 } 85 86 dp = (dirent_t *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 87 (void) memcpy(entry, dp, (size_t)dp->d_reclen); 88 lmutex_unlock(&pdirp->dd_lock); 89 *result = entry; 90 return (0); 91 } 92 93 #else /* _LP64 */ 94 95 /* 96 * POSIX.1c standard version of the thr function readdir_r. 97 * Large file version. 98 */ 99 100 int 101 readdir64_r(DIR *dirp, dirent64_t *entry, dirent64_t **result) 102 { 103 private_DIR *pdirp = (private_DIR *)(uintptr_t)dirp; 104 dirent64_t *dp64; /* -> directory data */ 105 int saveloc = 0; 106 107 lmutex_lock(&pdirp->dd_lock); 108 if (dirp->dd_size != 0) { 109 dp64 = (dirent64_t *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 110 /* was converted by readdir and needs to be reversed */ 111 if (dp64->d_ino == (ino64_t)-1) { 112 dirent_t *dp32; /* -> 32 bit directory data */ 113 114 dp32 = (dirent_t *)(&dp64->d_off); 115 dp64->d_ino = (ino64_t)dp32->d_ino; 116 dp64->d_off = (off64_t)dp32->d_off; 117 dp64->d_reclen = (unsigned short)(dp32->d_reclen + 118 ((char *)&dp64->d_off - (char *)dp64)); 119 } 120 saveloc = dirp->dd_loc; /* save for possible EOF */ 121 dirp->dd_loc += (int)dp64->d_reclen; 122 } 123 124 if (dirp->dd_loc >= dirp->dd_size) 125 dirp->dd_loc = dirp->dd_size = 0; 126 127 if (dirp->dd_size == 0 && /* refill buffer */ 128 (dirp->dd_size = getdents64(dirp->dd_fd, 129 (dirent64_t *)(uintptr_t)dirp->dd_buf, DIRBUF)) <= 0) { 130 if (dirp->dd_size == 0) { /* This means EOF */ 131 dirp->dd_loc = saveloc; /* so save for telldir */ 132 lmutex_unlock(&pdirp->dd_lock); 133 *result = NULL; 134 return (0); 135 } 136 lmutex_unlock(&pdirp->dd_lock); 137 *result = NULL; 138 return (errno); /* error */ 139 } 140 141 dp64 = (dirent64_t *)(uintptr_t)&dirp->dd_buf[dirp->dd_loc]; 142 (void) memcpy(entry, dp64, (size_t)dp64->d_reclen); 143 *result = entry; 144 lmutex_unlock(&pdirp->dd_lock); 145 return (0); 146 } 147 148 /* 149 * POSIX.1c standard version of the function readdir_r. 150 * User gets it via static readdir_r from header file. 151 */ 152 153 int 154 __posix_readdir_r(DIR *dirp, dirent_t *entry, dirent_t **result) 155 { 156 int error; 157 dirent64_t *dp64; 158 struct { 159 dirent64_t dirent64; 160 char chars[MAXNAMLEN]; 161 } buf; 162 163 error = readdir64_r(dirp, (dirent64_t *)&buf, &dp64); 164 if (error != 0 || dp64 == NULL) { 165 *result = NULL; 166 return (error); 167 } 168 169 if (dp64->d_ino > SIZE_MAX || 170 (uint64_t)dp64->d_off > (uint64_t)UINT32_MAX) { 171 *result = NULL; 172 return (EOVERFLOW); 173 } 174 175 entry->d_ino = (ino_t)dp64->d_ino; 176 entry->d_off = (off_t)dp64->d_off; 177 entry->d_reclen = (unsigned short)((((char *)entry->d_name - 178 (char *)entry) + strlen(dp64->d_name) + 1 + 3) & ~3); 179 (void) strcpy(entry->d_name, dp64->d_name); 180 *result = entry; 181 return (0); 182 } 183 184 /* 185 * POSIX.1c Draft-6 version of the function readdir_r. 186 * It was implemented by Solaris 2.3. 187 */ 188 189 dirent_t * 190 readdir_r(DIR *dirp, dirent_t *entry) 191 { 192 int error; 193 dirent_t *result; 194 195 if ((error = __posix_readdir_r(dirp, entry, &result)) != 0) 196 errno = error; 197 return (result); 198 } 199 200 #endif /* _LP64 */ 201