imfs_chown.c

来自「RTEMS (Real-Time Executive for Multiproc」· C语言 代码 · 共 57 行

/*
 *  IMFS_chown
 *
 *  This routine is the implementation of the chown() system 
 *  call for the IMFS.
 *
 *  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.rtems.com/license/LICENSE.
 *
 *  $Id: imfs_chown.c,v 1.6.2.1 2003/09/04 18:47:02 joel Exp $
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>
#include <rtems/libio_.h>
#include <rtems/seterr.h>
#include "imfs.h"

int IMFS_chown(
  rtems_filesystem_location_info_t  *pathloc,       /* IN */
  uid_t                              owner,         /* IN */
  gid_t                              group          /* IN */
)
{
  IMFS_jnode_t  *jnode;
#if defined(RTEMS_POSIX_API)
  uid_t          st_uid;
#endif

  jnode = (IMFS_jnode_t *) pathloc->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 ) )
    rtems_set_errno_and_return_minus_one( EPERM );
#endif

  jnode->st_uid = owner;
  jnode->st_gid = group;

  IMFS_update_ctime( jnode );

  return 0;
}