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, 50 insertions, 5 deletions

diff --git a/c/src/exec/libcsupport/src/getdents.c b/c/src/exec/libcsupport/src/getdents.c
index 9b16d82409..91631843b7 100644
--- a/c/src/exec/libcsupport/src/getdents.c
+++ b/c/src/exec/libcsupport/src/getdents.c
@@ -1,14 +1,59 @@
 /*
- *  Just enough to make newlib return an error.
+ *  getdents() - Get Directory Entries
+ *
+ *  SVR4 and SVID extension required by Newlib readdir() family.
+ *
+ *  This routine will dd_len / (sizeof dirent) directory entries relative to
+ *  the current directory position index. These entries will be placed in
+ *  character array pointed to by -dd_buf-
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
  *
  *  $Id$
  */
 
+#include <errno.h>
+
+#include "libio_.h"
+
 int getdents(
-  int   fd,
-  void *buf,
-  int   len
+  int   dd_fd,
+  char *dd_buf,
+  int   dd_len
 )
 {
-  return -1;
+  rtems_libio_t                    *iop;
+  rtems_filesystem_location_info_t  loc;
+
+  /*
+   *  Get the file control block structure associated with the file descriptor
+   */
+
+  iop = rtems_libio_iop( dd_fd );
+
+  /*
+   *  Make sure we are working on a directory
+   */
+  loc = iop->pathinfo;
+  if ( !loc.ops->node_type )
+    set_errno_and_return_minus_one( ENOTSUP );
+    
+  if ( (*loc.ops->node_type)( &loc ) != RTEMS_FILESYSTEM_DIRECTORY )
+    set_errno_and_return_minus_one( ENOTDIR );
+
+  /*
+   *  Return the number of bytes that were actually transfered as a result
+   *  of the read attempt.
+   */
+
+  if ( !iop->handlers->read )
+    set_errno_and_return_minus_one( ENOTSUP );
+
+  return (*iop->handlers->read)( iop, dd_buf, dd_len  );
 }