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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.

 *

 *  imfs_fchmod.c,v 1.7 2002/01/04 18:30:58 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_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 ) )

    rtems_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 ) ) )

    rtems_set_errno_and_return_minus_one( EPERM );

  /*

   * If we make a linear-file writeable, construct a block file

   * from it first.

   */

  if ( (jnode->type == IMFS_LINEAR_FILE) &&

       (mode & (S_IWUSR | S_IWGRP | S_IWOTH)) )

  {

    unsigned32 count = jnode->info.linearfile.size;

    const unsigned char *buffer = jnode->info.linearfile.direct;

    jnode->type = IMFS_MEMORY_FILE;

    jnode->info.file.size            = 0;

    jnode->info.file.indirect        = 0;

    jnode->info.file.doubly_indirect = 0;

    jnode->info.file.triply_indirect = 0;

    if (IMFS_memfile_write(jnode, 0, buffer, count) == -1)

       return(-1);

  }

  jnode->st_mode &= ~(S_IRWXU | S_IRWXG | S_IRWXO);

  jnode->st_mode |= mode;

  IMFS_update_ctime( jnode );

  return 0;

}