forked from Imagelibrary/rtems
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @brief Read Value of a Symbolic Link
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* @ingroup libcsupport
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*/
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/*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <unistd.h>
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#include <rtems/libio_.h>
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/**
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* POSIX 1003.1b - X.X.X - XXX
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*/
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ssize_t readlink( const char *__restrict path, char *__restrict buf,
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size_t bufsize )
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{
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ssize_t rv = 0;
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rtems_filesystem_eval_path_context_t ctx;
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int eval_flags = RTEMS_FS_FOLLOW_HARD_LINK;
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const rtems_filesystem_location_info_t *currentloc =
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rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
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const rtems_filesystem_operations_table *ops = currentloc->mt_entry->ops;
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mode_t type = rtems_filesystem_location_type( currentloc );
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if ( S_ISLNK( type ) ) {
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rv = (*ops->readlink_h)( currentloc, buf, bufsize );
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} else {
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rtems_filesystem_eval_path_error( &ctx, EINVAL );
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rv = -1;
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}
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rtems_filesystem_eval_path_cleanup( &ctx );
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return rv;
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}
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