source: rtems/c/src/lib/libc/opendir.c @ 32163db

4.104.114.84.95
Last change on this file since 32163db was 07a3253d, checked in by Joel Sherrill <joel.sherrill@…>, on 11/23/98 at 19:07:58

Added base version of file system infrastructure. This includes a major
overhaul of the RTEMS system call interface. This base file system is
the "In-Memory File System" aka IMFS.

The design and implementation was done by the following people:

+ Joel Sherrill (joel@…)
+ Jennifer Averett (jennifer@…)
+ Steve "Mr Mount" Salitasc (salitasc@…)
+ Kerwin Wade (wade@…)

PROBLEMS
========

+ It is VERY likely that merging this will break the UNIX port. This

can/will be fixed.

+ There is likely some reentrancy/mutual exclusion needed.

+ Eventually, there should be a "mini-IMFS" description table to

eliminate links, symlinks, etc to save memory. All you need to
have "classic RTEMS" functionality is technically directories
and device IO. All the rest could be left out to save memory.

  • Property mode set to 100644
File size: 2.8 KB
Line 
1/*
2 *  opendir() - POSIX 1003.1b - XXX
3 *
4 *  This was copied from Newlib 1.8.0.
5 *
6 * 
7 * Copyright (c) 1983 Regents of the University of California.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *      This product includes software developed by the University of
21 *      California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#if defined(LIBC_SCCS) && !defined(lint)
40static char sccsid[] = "@(#)opendir.c   5.11 (Berkeley) 2/23/91";
41#endif /* LIBC_SCCS and not lint */
42
43#include <dirent.h>
44#include <fcntl.h>
45#include <stdlib.h>
46#include <unistd.h>
47
48/*
49 * open a directory.
50 */
51DIR *
52opendir(name)
53        const char *name;
54{
55        register DIR *dirp;
56        register int fd;
57
58        if ((fd = open(name, 0)) == -1)
59                return NULL;
60        if (fcntl(fd, F_SETFD, 1) == -1 ||
61            (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
62                close (fd);
63                return NULL;
64        }
65        /*
66         * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
67         * buffer that it cluster boundary aligned.
68         * Hopefully this can be a big win someday by allowing page trades
69         * to user space to be done by getdirentries()
70         */
71        dirp->dd_buf = malloc (512);
72        dirp->dd_len = 512;
73
74        if (dirp->dd_buf == NULL) {
75                close (fd);
76                return NULL;
77        }
78        dirp->dd_fd = fd;
79        dirp->dd_loc = 0;
80        dirp->dd_seek = 0;
81        /*
82         * Set up seek point for rewinddir.
83         */
84        return dirp;
85}
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