mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-03 14:48:57 +00:00
55e2b2c608
- it succeeded on non-directories (see POSIX 5.1.2.4). - it hung on (non-open) named pipes. - it leaked memory if the second malloc() failed. - it didn't preserve errno across errors in close().
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)opendir.c 8.2 (Berkeley) 2/12/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
/*
|
|
* open a directory.
|
|
*/
|
|
DIR *
|
|
opendir(name)
|
|
const char *name;
|
|
{
|
|
register DIR *dirp;
|
|
register int fd;
|
|
int saved_errno;
|
|
struct stat sb;
|
|
|
|
if ((fd = open(name, O_RDONLY | O_NONBLOCK)) == -1)
|
|
return NULL;
|
|
dirp = NULL;
|
|
if (fstat(fd, &sb) != 0)
|
|
goto fail;
|
|
if (!S_ISDIR(sb.st_mode)) {
|
|
errno = ENOTDIR;
|
|
goto fail;
|
|
}
|
|
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
|
|
(dirp = malloc(sizeof(DIR))) == NULL)
|
|
goto fail;
|
|
/*
|
|
* If CLBYTES is an exact multiple of DIRBLKSIZ, use a CLBYTES
|
|
* buffer that it cluster boundary aligned.
|
|
* Hopefully this can be a big win someday by allowing page trades
|
|
* to user space to be done by getdirentries()
|
|
*/
|
|
if ((CLBYTES % DIRBLKSIZ) == 0) {
|
|
dirp->dd_buf = malloc(CLBYTES);
|
|
dirp->dd_len = CLBYTES;
|
|
} else {
|
|
dirp->dd_buf = malloc(DIRBLKSIZ);
|
|
dirp->dd_len = DIRBLKSIZ;
|
|
}
|
|
if (dirp->dd_buf == NULL)
|
|
goto fail;
|
|
dirp->dd_fd = fd;
|
|
dirp->dd_loc = 0;
|
|
dirp->dd_seek = 0;
|
|
/*
|
|
* Set up seek point for rewinddir.
|
|
*/
|
|
dirp->dd_rewind = telldir(dirp);
|
|
return dirp;
|
|
|
|
fail:
|
|
saved_errno = errno;
|
|
free(dirp);
|
|
close(fd);
|
|
errno = saved_errno;
|
|
return NULL;
|
|
}
|