125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/* $OpenBSD: opendir.c,v 1.30 2016/09/21 04:38:56 guenther Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "telldir.h"
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static DIR *__fdopendir(int fd);
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/*
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* Open a directory specified by name.
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*/
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DIR *
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opendir(const char *name)
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{
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DIR *dirp;
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int fd;
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if ((fd = open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) == -1)
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return (NULL);
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dirp = __fdopendir(fd);
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if (dirp == NULL)
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close(fd);
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return (dirp);
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}
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DEF_WEAK(opendir);
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/*
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* Open a directory specified by file descriptor.
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*/
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DIR *
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fdopendir(int fd)
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{
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DIR *dirp;
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int flags;
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if ((flags = fcntl(fd, F_GETFL)) == -1)
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return (NULL);
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if ((flags & O_ACCMODE) != O_RDONLY && (flags & O_ACCMODE) != O_RDWR) {
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errno = EBADF;
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return (NULL);
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}
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dirp = __fdopendir(fd);
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if (dirp != NULL) {
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/* Record current offset for immediate telldir() */
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dirp->dd_bufpos = dirp->dd_curpos = lseek(fd, 0, SEEK_CUR);
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/*
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* POSIX doesn't require fdopendir() to set
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* FD_CLOEXEC, so it's okay for this to fail.
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*/
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(void)fcntl(fd, F_SETFD, FD_CLOEXEC);
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}
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return (dirp);
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}
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DEF_WEAK(fdopendir);
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static DIR *
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__fdopendir(int fd)
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{
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DIR *dirp;
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struct stat sb;
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int pageoffset;
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if (fstat(fd, &sb))
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return (NULL);
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if (!S_ISDIR(sb.st_mode)) {
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errno = ENOTDIR;
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return (NULL);
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}
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if ((dirp = malloc(sizeof(DIR))) == NULL)
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return (NULL);
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pageoffset = getpagesize() - 1;
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dirp->dd_len = ((int)sb.st_blksize * 4 + pageoffset) & ~pageoffset;
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dirp->dd_buf = malloc(dirp->dd_len);
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if (dirp->dd_buf == NULL) {
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free(dirp);
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return (NULL);
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}
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dirp->dd_size = 0;
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dirp->dd_loc = 0;
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dirp->dd_fd = fd;
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dirp->dd_lock = NULL;
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dirp->dd_curpos = 0;
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dirp->dd_bufpos = 0;
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return (dirp);
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}
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