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, 111 insertions, 0 deletions

diff --git a/c/src/lib/libc/fcntl.c b/c/src/lib/libc/fcntl.c
new file mode 100644
index 0000000000..f6f33534ab
--- /dev/null
+++ b/c/src/lib/libc/fcntl.c
@@ -0,0 +1,111 @@
+/*
+ *   fcntl() - POSIX 1003.1b 6.5.2 - File Control
+ *
+ *  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 <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <rtems.h>
+#include "libio_.h"
+
+int fcntl(
+  int fd,
+  int cmd,
+  ...
+)
+{
+  va_list        ap;
+  rtems_libio_t *iop;
+  
+  va_start( ap, cmd );
+
+  /*
+   *  If this is not a file system based entity, it is an error.
+   */
+
+  if ( rtems_file_descriptor_type( fd ) )
+    set_errno_and_return_minus_one( EBADF );
+
+  /*
+   *  Now process the fcntl().
+   */
+
+  iop = rtems_libio_iop( fd );
+  rtems_libio_check_fd( fd );
+
+  /*
+   *  This switch should contain all the cases from POSIX.
+   */
+
+  switch ( cmd ) {
+    case F_DUPFD:        /* dup */
+      /*
+       *  This is how it appears that this case should work:
+       *
+       *     filedes2 = va_arg( ap, int )
+       *     if filedes2 is 0
+       *       duplicate fd into a new descriptor
+       *     else
+       *       duplicate fd into specified descriptor after error checking it
+       *
+       *  See dup2() in case we can eliminate stuff in there.
+       */
+      return -1;
+
+    case F_GETFD:        /* get f_flags */
+      if ( iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC )
+        return 1;
+      return 0;
+
+    case F_SETFD:        /* set f_flags */
+      /*
+       *  Interpret the third argument as the "close on exec()" flag.
+       *  If this argument is 1, then the file descriptor is to be closed
+       *  if a new process is exec()'ed.  Since RTEMS does not support
+       *  processes, then we can ignore this one except to make 
+       *  F_GETFD work.
+       */
+
+      if ( va_arg( ap, int ) )
+        iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC;
+      else
+        iop->flags &= ~LIBIO_FLAGS_CLOSE_ON_EXEC;
+      return 0;
+
+    case F_GETFL:        /* more flags (cloexec) */
+      return -1;
+
+    case F_SETFL:
+      return -1;
+
+    case F_GETLK:
+      return -1;
+
+    case F_SETLK:
+      return -1;
+
+    case F_SETLKW:
+      return -1;
+
+    case F_SETOWN:       /*  for sockets. */
+      return -1;
+
+    case F_GETOWN:       /*  for sockets. */
+      return -1;
+
+    default:
+      break;
+  }
+  return -1;
+}