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