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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;
}