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@OARcorp.com)
  + Jennifer Averett (jennifer@OARcorp.com)
  + Steve "Mr Mount" Salitasc (salitasc@OARcorp.com)
  + Kerwin Wade (wade@OARcorp.com)

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.

1 files changed, 73 insertions, 5 deletions

diff --git a/cpukit/libcsupport/src/opendir.c b/cpukit/libcsupport/src/opendir.c
index e303eb28e5..f0e9488684 100644
--- a/cpukit/libcsupport/src/opendir.c
+++ b/cpukit/libcsupport/src/opendir.c
@@ -1,17 +1,85 @@
 /*
  *  opendir() - POSIX 1003.1b - XXX
  *
- *  $Id$
+ *  This was copied from Newlib 1.8.0.
+ *
+ *  
+ * Copyright (c) 1983 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	5.11 (Berkeley) 2/23/91";
+#endif /* LIBC_SCCS and not lint */
+
 #include <dirent.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <unistd.h>
 
-DIR *opendir(
-  const char *name
-)
+/*
+ * open a directory.
+ */
+DIR *
+opendir(name)
+	const char *name;
 {
-  return NULL;
+	register DIR *dirp;
+	register int fd;
+
+	if ((fd = open(name, 0)) == -1)
+		return NULL;
+	if (fcntl(fd, F_SETFD, 1) == -1 ||
+	    (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
+		close (fd);
+		return NULL;
+	}
+	/*
+	 * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
+	 * 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()
+	 */
+	dirp->dd_buf = malloc (512);
+	dirp->dd_len = 512;
+
+	if (dirp->dd_buf == NULL) {
+		close (fd);
+		return NULL;
+	}
+	dirp->dd_fd = fd;
+	dirp->dd_loc = 0;
+	dirp->dd_seek = 0;
+	/*
+	 * Set up seek point for rewinddir.
+	 */
+	return dirp;
 }