Patch from Chris Johns <cjohns@cybertec.com.au> to add fchdir()

functionality to libc and update TODO.

2 files changed, 72 insertions, 0 deletions

diff --git a/cpukit/libcsupport/src/TODO b/cpukit/libcsupport/src/TODO
index 9d894688d9..38cb012326 100644
--- a/cpukit/libcsupport/src/TODO
+++ b/cpukit/libcsupport/src/TODO
@@ -9,3 +9,6 @@
   See device_lseek() for an example of where this would be nice.
 
 + Fix strerror() so it prints all error numbers.
+
++ Check the node allocation coment in the fchdir call.
++ Add an interface somewhere for this call.
\ No newline at end of file
diff --git a/cpukit/libcsupport/src/fchdir.c b/cpukit/libcsupport/src/fchdir.c
new file mode 100644
index 0000000000..99380514df
--- /dev/null
+++ b/cpukit/libcsupport/src/fchdir.c
@@ -0,0 +1,69 @@
+/*
+ *  fchdir() - compatible with SVr4, 4.4BSD and X/OPEN - Change Directory
+ *
+ *  COPYRIGHT (c) 1989-2000.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  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 <sys/stat.h>
+#include <errno.h>
+
+#include <rtems.h>
+#include <rtems/libio.h>
+#include "libio_.h"
+
+int fchdir(
+  int       fd
+)
+{
+  rtems_libio_t *iop;
+  
+  rtems_libio_check_fd( fd );
+  iop = rtems_libio_iop( fd );
+  rtems_libio_check_is_open(iop);
+
+  /*
+   *  Now process the fchmod().
+   */
+
+  rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );
+
+  /*
+   * Verify you can change directory into this node.
+   */
+
+  if ( !iop->pathinfo.ops ) {
+    set_errno_and_return_minus_one( ENOTSUP );
+  }
+
+  if ( !iop->pathinfo.ops->node_type ) {
+    set_errno_and_return_minus_one( ENOTSUP );
+  }
+
+  if (  (*iop->pathinfo.ops->node_type)( &iop->pathinfo ) !=
+                                          RTEMS_FILESYSTEM_DIRECTORY ) {
+    set_errno_and_return_minus_one( ENOTDIR );
+  }
+  
+  rtems_filesystem_freenode( &rtems_filesystem_current );
+
+  /*
+   * FIXME : I feel there should be another call to
+   *         actually take into account the extra reference to
+   *         this node which we are making here. I can
+   *         see the freenode interface but do not see
+   *         allocnode node interface. It maybe node_type.
+   */
+  
+  rtems_filesystem_current = iop->pathinfo;
+  
+  return 0;
+}
+