1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include "namespace.h" 33 #include <sys/param.h> 34 #include <dirent.h> 35 #include <errno.h> 36 #include <string.h> 37 #include <pthread.h> 38 #include "un-namespace.h" 39 40 #include "libc_private.h" 41 #include "gen-private.h" 42 #include "telldir.h" 43 44 #include "gen-compat.h" 45 46 /* 47 * get next entry in a directory. 48 */ 49 struct dirent * 50 _readdir_unlocked(DIR *dirp, int flags) 51 { 52 struct dirent *dp; 53 off_t initial_seek; 54 size_t initial_loc = 0; 55 ssize_t ret; 56 57 for (;;) { 58 if (dirp->dd_loc >= dirp->dd_size) { 59 if (dirp->dd_flags & __DTF_READALL) 60 return (NULL); 61 initial_loc = dirp->dd_loc; 62 dirp->dd_flags &= ~__DTF_SKIPREAD; 63 dirp->dd_loc = 0; 64 } 65 if (dirp->dd_loc == 0 && 66 !(dirp->dd_flags & (__DTF_READALL | __DTF_SKIPREAD))) { 67 dirp->dd_size = 0; 68 initial_seek = dirp->dd_seek; 69 ret = _getdirentries(dirp->dd_fd, 70 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 71 if (ret <= 0) 72 return (NULL); 73 dirp->dd_size = (size_t)ret; 74 _fixtelldir(dirp, initial_seek, initial_loc); 75 } 76 dirp->dd_flags &= ~__DTF_SKIPREAD; 77 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 78 if ((long)dp & 03L) /* bogus pointer check */ 79 return (NULL); 80 if (dp->d_reclen <= 0 || 81 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 82 return (NULL); 83 dirp->dd_loc += dp->d_reclen; 84 if (dp->d_ino == 0 && (flags & RDU_SKIP) != 0) 85 continue; 86 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 87 continue; 88 if (dp->d_namlen >= sizeof(dp->d_name) && 89 (flags & RDU_SHORT) != 0) 90 continue; 91 return (dp); 92 } 93 } 94 95 struct dirent * 96 readdir(DIR *dirp) 97 { 98 struct dirent *dp; 99 100 if (__isthreaded) 101 _pthread_mutex_lock(&dirp->dd_lock); 102 dp = _readdir_unlocked(dirp, RDU_SKIP); 103 if (__isthreaded) 104 _pthread_mutex_unlock(&dirp->dd_lock); 105 return (dp); 106 } 107 108 int 109 freebsd15_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result) 110 { 111 struct dirent *dp; 112 int saved_errno; 113 114 saved_errno = errno; 115 errno = 0; 116 if (__isthreaded) 117 _pthread_mutex_lock(&dirp->dd_lock); 118 dp = _readdir_unlocked(dirp, RDU_SKIP | RDU_SHORT); 119 if (dp != NULL) 120 memcpy(entry, dp, _GENERIC_DIRSIZ(dp)); 121 if (__isthreaded) 122 _pthread_mutex_unlock(&dirp->dd_lock); 123 124 if (errno != 0) { 125 if (dp == NULL) 126 return (errno); 127 } else 128 errno = saved_errno; 129 130 if (dp != NULL) 131 *result = entry; 132 else 133 *result = NULL; 134 135 return (0); 136 } 137 138 __sym_compat(readdir_r, freebsd15_readdir_r, FBSD_1.5); 139