libcsupport/src/chdir.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup libio Internal Interface
0007  *
0008  * @brief POSIX 1003.1b - 5.2.1 - Change Current Working Directory
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2010.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  *  Modifications to support reference counting in the file system are
0016  *  Copyright (c) 2012 embedded brains GmbH & Co. KG
0017  *
0018  * Redistribution and use in source and binary forms, with or without
0019  * modification, are permitted provided that the following conditions
0020  * are met:
0021  * 1. Redistributions of source code must retain the above copyright
0022  *    notice, this list of conditions and the following disclaimer.
0023  * 2. Redistributions in binary form must reproduce the above copyright
0024  *    notice, this list of conditions and the following disclaimer in the
0025  *    documentation and/or other materials provided with the distribution.
0026  *
0027  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0028  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0029  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0030  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0031  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0032  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0033  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0034  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0035  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0036  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0037  * POSSIBILITY OF SUCH DAMAGE.
0038  */
0039
0040 #ifdef HAVE_CONFIG_H
0041 #include "config.h"
0042 #endif
0043
0044 #include <unistd.h>
0045
0046 #include <rtems/libio_.h>
0047
0048 int rtems_filesystem_chdir( rtems_filesystem_location_info_t *loc )
0049 {
0050   int rv = 0;
0051   rtems_filesystem_global_location_t *global_loc =
0052     rtems_filesystem_location_transform_to_global( loc );
0053   mode_t type = rtems_filesystem_location_type( &global_loc->location );
0054
0055   if ( S_ISDIR( type ) ) {
0056     rtems_filesystem_global_location_assign(
0057       &rtems_filesystem_current,
0058       global_loc
0059     );
0060   } else {
0061     rtems_filesystem_location_error( &global_loc->location, ENOTDIR );
0062     rtems_filesystem_global_location_release( global_loc, true );
0063     rv = -1;
0064   }
0065
0066   return rv;
0067 }
0068
0069 int chdir( const char *path )
0070 {
0071   int rv = 0;
0072   rtems_filesystem_eval_path_context_t ctx;
0073   int eval_flags = RTEMS_FS_PERMS_EXEC
0074     | RTEMS_FS_FOLLOW_LINK;
0075   rtems_filesystem_location_info_t pathloc;
0076
0077   rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
0078   rtems_filesystem_eval_path_extract_currentloc( &ctx, &pathloc );
0079   rv = rtems_filesystem_chdir( &pathloc );
0080   rtems_filesystem_eval_path_cleanup( &ctx );
0081
0082   return rv;
0083 }