1/** @file 2 Open a directory. 3 4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 Copyright (c) 1983, 1993 14 The Regents of the University of California. All rights reserved. 15 16 Redistribution and use in source and binary forms, with or without 17 modification, are permitted provided that the following conditions 18 are met: 19 1. Redistributions of source code must retain the above copyright 20 notice, this list of conditions and the following disclaimer. 21 2. Redistributions in binary form must reproduce the above copyright 22 notice, this list of conditions and the following disclaimer in the 23 documentation and/or other materials provided with the distribution. 24 3. Neither the name of the University nor the names of its contributors 25 may be used to endorse or promote products derived from this software 26 without specific prior written permission. 27 28 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 SUCH DAMAGE. 39 40 NetBSD: opendir.c,v 1.33 2008/01/10 09:49:04 elad Exp 41 opendir.c 8.7 (Berkeley) 12/10/94 42**/ 43#include <sys/cdefs.h> 44 45#include <namespace.h> 46#include <reentrant.h> 47#include <extern.h> 48#include <sys/param.h> 49//#include <sys/mount.h> 50#include <sys/stat.h> 51 52#include <assert.h> 53#include <dirent.h> 54#include <errno.h> 55#include <fcntl.h> 56#include <stdlib.h> 57#include <string.h> 58#include <unistd.h> 59 60#define MAXITERATIONS 100 61 62/* 63 * Open a directory. 64 */ 65DIR * 66opendir(const char *name) 67{ 68 _DIAGASSERT(name != NULL); 69 70 return (__opendir2(name, DTF_HIDEW|DTF_NODUP)); 71} 72 73DIR * 74__opendir2(const char *name, int flags) 75{ 76 DIR *dirp = NULL; 77 int fd; 78 int serrno; 79 struct stat sb; 80 int incr; 81 82 _DIAGASSERT(name != NULL); 83 84 if ((fd = open(name, O_RDONLY | O_NONBLOCK, 0)) == -1 || 85 fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) 86 goto error; 87 if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) { 88 errno = ENOTDIR; 89 goto error; 90 } 91 if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) 92 goto error; 93 dirp->dd_buf = NULL; 94 95 /* 96 * If the machine's page size is an exact multiple of DIRBLKSIZ, 97 * use a buffer that is cluster boundary aligned. 98 * Hopefully this can be a big win someday by allowing page trades 99 * to user space to be done by getdirentries() 100 */ 101 incr = DIRBLKSIZ; 102 103 dirp->dd_len = incr; 104 dirp->dd_buf = malloc((size_t)dirp->dd_len); 105 if (dirp->dd_buf == NULL) 106 goto error; 107 dirp->dd_seek = 0; 108 flags &= ~DTF_REWIND; 109 110 dirp->dd_loc = 0; 111 dirp->dd_fd = fd; 112 dirp->dd_flags = flags; 113 114 /* 115 * Set up seek point for rewinddir. 116 */ 117#ifdef _REENTRANT 118 if (__isthreaded) { 119 if ((dirp->dd_lock = malloc(sizeof(mutex_t))) == NULL) 120 goto error; 121 mutex_init((mutex_t *)dirp->dd_lock, NULL); 122 } 123#endif 124 dirp->dd_internal = NULL; 125 return (dirp); 126error: 127 serrno = errno; 128 if (dirp && dirp->dd_buf) 129 free(dirp->dd_buf); 130 if (dirp) 131 free(dirp); 132 if (fd != -1) 133 (void)close(fd); 134 errno = serrno; 135 return NULL; 136} 137