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/* $OpenBSD: opendir.c,v 1.15 2005/10/10 17:37:43 espie 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/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* Open a directory.
*/
DIR *
opendir(const char *name)
{
return (__opendir2(name, DTF_NODUP));
}
DIR *
__opendir2(const char *name, int flags)
{
DIR *dirp;
int fd;
struct stat sb;
int pagesz;
int incr;
if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1)
return (NULL);
if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) {
close(fd);
errno = ENOTDIR;
return (NULL);
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
(dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
close(fd);
return (NULL);
}
/*
* If the machine's page size is an exact multiple of DIRBLKSIZ,
* use a buffer that is cluster boundary aligned.
* Hopefully this can be a big win someday by allowing page trades
* to user space to be done by getdirentries()
*/
if (((pagesz = getpagesize()) % DIRBLKSIZ) == 0)
incr = pagesz;
else
incr = DIRBLKSIZ;
dirp->dd_len = incr;
dirp->dd_buf = malloc(dirp->dd_len);
if (dirp->dd_buf == NULL) {
free(dirp);
close (fd);
return (NULL);
}
dirp->dd_seek = 0;
dirp->dd_loc = 0;
dirp->dd_fd = fd;
dirp->dd_flags = flags;
/*
* Set up seek point for rewinddir.
*/
dirp->dd_rewind = telldir(dirp);
return (dirp);
}
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