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

functionality to libc and update TODO.

c/src/exec/libcsupport/src/Makefile.am

@@ -29,7 +29,7 @@ TERMIOS_C_FILES = cfgetispeed.c cfgetospeed.c cfsetispeed.c cfsetospeed.c \
     termiosreserveresources.c
 
 SYSTEM_CALL_C_FILES = open.c close.c read.c write.c lseek.c ioctl.c mkdir.c \
-    mknod.c mkfifo.c rmdir.c chdir.c chmod.c fchmod.c chown.c link.c \
+    mknod.c mkfifo.c rmdir.c chdir.c chmod.c fchdir.c fchmod.c chown.c link.c \
     unlink.c umask.c ftruncate.c utime.c fstat.c fcntl.c fpathconf.c \
     getdents.c fsync.c fdatasync.c pipe.c dup.c dup2.c symlink.c readlink.c \
     creat.c

c/src/exec/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.

c/src/exec/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;
+}
+

c/src/lib/libc/Makefile.am

@@ -29,7 +29,7 @@ TERMIOS_C_FILES = cfgetispeed.c cfgetospeed.c cfsetispeed.c cfsetospeed.c \
     termiosreserveresources.c
 
 SYSTEM_CALL_C_FILES = open.c close.c read.c write.c lseek.c ioctl.c mkdir.c \
-    mknod.c mkfifo.c rmdir.c chdir.c chmod.c fchmod.c chown.c link.c \
+    mknod.c mkfifo.c rmdir.c chdir.c chmod.c fchdir.c fchmod.c chown.c link.c \
     unlink.c umask.c ftruncate.c utime.c fstat.c fcntl.c fpathconf.c \
     getdents.c fsync.c fdatasync.c pipe.c dup.c dup2.c symlink.c readlink.c \
     creat.c

c/src/lib/libc/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.

c/src/lib/libc/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;
+}
+