libcsupport/src/unlink.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Remove an Existing Link
0007  *  @ingroup libcsupport
0008  */
0009
0010 /*
0011  *  COPYRIGHT (c) 1989-1999.
0012  *  On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037 #include "config.h"
0038 #endif
0039
0040 #include <unistd.h>
0041
0042 #include <rtems/libio_.h>
0043
0044 /**
0045  *  POSIX 1003.1b - 5.5.1 - Remove an existing link
0046  */
0047 int unlink( const char *path )
0048 {
0049   int rv = 0;
0050   rtems_filesystem_eval_path_context_t ctx;
0051   int eval_flags = RTEMS_FS_REJECT_TERMINAL_DOT;
0052   rtems_filesystem_location_info_t parentloc;
0053   int parent_eval_flags = RTEMS_FS_PERMS_WRITE
0054     | RTEMS_FS_PERMS_EXEC
0055     | RTEMS_FS_FOLLOW_LINK;
0056   const rtems_filesystem_location_info_t *currentloc =
0057     rtems_filesystem_eval_path_start_with_parent(
0058       &ctx,
0059       path,
0060       eval_flags,
0061       &parentloc,
0062       parent_eval_flags
0063     );
0064
0065   if ( !rtems_filesystem_location_is_instance_root( currentloc ) ) {
0066     const rtems_filesystem_operations_table *ops = currentloc->mt_entry->ops;
0067
0068     rv = (*ops->rmnod_h)( &parentloc, currentloc );
0069   } else {
0070     rtems_filesystem_eval_path_error( &ctx, EBUSY );
0071     rv = -1;
0072   }
0073
0074   rtems_filesystem_eval_path_cleanup_with_parent( &ctx, &parentloc );
0075
0076   return rv;
0077 }
0078
0079 #if defined(RTEMS_NEWLIB)
0080
0081 #include <reent.h>
0082
0083 /**
0084  *  This is the Newlib dependent reentrant version of unlink().
0085  */
0086 int _unlink_r(
0087   struct _reent *ptr RTEMS_UNUSED,
0088   const char    *path
0089 )
0090 {
0091   return unlink( path );
0092 }
0093 #endif