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/*
 *  IMFS file change mode routine.
 *
 *  COPYRIGHT (c) 1989-1999.
 *  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: imfs_fchmod.c,v 1.2 2001-09-27 12:01:15 chris Exp $
 */
 
#include <errno.h>
 
#include "libio_.h"
#include "imfs.h"
 
int IMFS_fchmod(
  rtems_filesystem_location_info_t *loc,
  mode_t                            mode
)
{
  IMFS_jnode_t  *jnode;
#if defined(RTEMS_POSIX_API)
  uid_t          st_uid;
#endif
 
  jnode = loc->node_access;
 
  /*
   *  Verify I am the owner of the node or the super user.
   */
#if defined(RTEMS_POSIX_API)
  st_uid = geteuid();
 
  if ( ( st_uid != jnode->st_uid ) && ( st_uid != 0 ) )
    set_errno_and_return_minus_one( EPERM );
#endif
 
  /*
   * Change only the RWX permissions on the jnode to mode.
   */
  if ( mode & (~ (S_IRWXU | S_IRWXG | S_IRWXO ) ) )
    set_errno_and_return_minus_one( EPERM );
 
  jnode->st_mode &= ~(S_IRWXU | S_IRWXG | S_IRWXO);
  jnode->st_mode |= mode;
 
  IMFS_update_ctime( jnode );
 
  return 0;
}