forked from Imagelibrary/rtems
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/**
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* @file
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*
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* @brief Change Root Directory
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* @ingroup libcsupport
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*/
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/*
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* Author: fernando.ruiz@ctv.es
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*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* Modifications to support reference counting in the file system are
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* Copyright (c) 2012 embedded brains GmbH.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <unistd.h>
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#include <rtems/libio_.h>
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int chroot( const char *path )
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{
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int rv = 0;
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rtems_status_code sc = RTEMS_SUCCESSFUL;
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rtems_filesystem_eval_path_context_t ctx;
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int eval_flags = RTEMS_FS_PERMS_EXEC
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| RTEMS_FS_FOLLOW_LINK;
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rtems_filesystem_location_info_t loc;
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rtems_filesystem_global_location_t *new_current_loc;
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/*
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* We use the global environment for path evaluation. This makes it possible
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* to escape from a chroot environment referencing an unmounted file system.
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*/
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rtems_filesystem_eval_path_start_with_root_and_current(
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&ctx,
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path,
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strlen( path ),
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eval_flags,
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&rtems_global_user_env.root_directory,
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&rtems_global_user_env.current_directory
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);
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rtems_filesystem_eval_path_extract_currentloc( &ctx, &loc );
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new_current_loc = rtems_filesystem_location_transform_to_global( &loc );
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if ( !rtems_filesystem_global_location_is_null( new_current_loc ) ) {
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rtems_filesystem_global_location_t *new_root_loc =
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rtems_filesystem_global_location_obtain( &new_current_loc );
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mode_t type = rtems_filesystem_location_type( &new_root_loc->location );
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if ( S_ISDIR( type ) ) {
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sc = rtems_libio_set_private_env();
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if (sc == RTEMS_SUCCESSFUL) {
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rtems_filesystem_global_location_assign(
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&rtems_filesystem_root,
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new_root_loc
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);
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rtems_filesystem_global_location_assign(
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&rtems_filesystem_current,
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new_current_loc
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);
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} else {
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if (sc != RTEMS_UNSATISFIED) {
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errno = ENOMEM;
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}
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rv = -1;
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}
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} else {
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rtems_filesystem_location_error( &new_root_loc->location, ENOTDIR );
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rv = -1;
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}
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if ( rv != 0 ) {
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rtems_filesystem_global_location_release( new_root_loc, true );
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}
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} else {
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rv = -1;
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}
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rtems_filesystem_eval_path_cleanup( &ctx );
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if ( rv != 0 ) {
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rtems_filesystem_global_location_release( new_current_loc, false );
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}
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return rv;
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}
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