97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char sccsid[] = "from: @(#)opendir.c 8.2 (Berkeley) 2/12/94";*/
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static char rcsid[] = "$Id: opendir.c,v 1.4 1994/09/15 10:48:51 pk Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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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 <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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/*
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* open a directory.
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*/
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DIR *
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opendir(name)
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const char *name;
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{
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struct stat statb;
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register DIR *dirp;
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register int fd;
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register int pagesz;
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if ((fd = open(name, 0)) == -1)
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return NULL;
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if (fstat(fd, &statb) || !S_ISDIR(statb.st_mode)) {
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errno = ENOTDIR;
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close (fd);
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return NULL;
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}
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1 ||
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(dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
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close (fd);
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return NULL;
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}
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/*
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* If the machine's page size is an exact multiple of DIRBLKSIZ,
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* use a buffer that is cluster boundary aligned.
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* Hopefully this can be a big win someday by allowing page trades
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* to user space to be done by getdirentries()
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*/
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if (((pagesz = getpagesize()) % DIRBLKSIZ) == 0)
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dirp->dd_len = pagesz;
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else
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dirp->dd_len = DIRBLKSIZ;
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dirp->dd_buf = malloc(dirp->dd_len);
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if (dirp->dd_buf == NULL) {
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close (fd);
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return NULL;
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}
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dirp->dd_fd = fd;
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dirp->dd_loc = 0;
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dirp->dd_seek = 0;
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/*
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* Set up seek point for rewinddir.
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*/
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dirp->dd_rewind = telldir(dirp);
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return dirp;
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}
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