forked from Imagelibrary/rtems
89 lines
2.5 KiB
C
89 lines
2.5 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 Change Directory
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* @ingroup libcsupport
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*/
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/*
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* COPYRIGHT (c) 1989-2011.
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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 & Co. KG
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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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* compatible with SVr4, 4.4BSD and X/OPEN - Change Directory
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*/
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int fchdir( int fd )
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{
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int rv = 0;
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rtems_libio_t *iop;
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struct stat st;
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rtems_filesystem_location_info_t loc;
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st.st_mode = 0;
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st.st_uid = 0;
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st.st_gid = 0;
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LIBIO_GET_IOP( fd, iop );
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rtems_filesystem_instance_lock( &iop->pathinfo );
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rv = (*iop->pathinfo.handlers->fstat_h)( &iop->pathinfo, &st );
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if ( rv == 0 ) {
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bool access_ok = rtems_filesystem_check_access(
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RTEMS_FS_PERMS_EXEC,
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st.st_mode,
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st.st_uid,
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st.st_gid
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);
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if ( access_ok ) {
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rtems_filesystem_location_clone( &loc, &iop->pathinfo );
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} else {
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errno = EACCES;
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rv = -1;
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}
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}
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rtems_filesystem_instance_unlock( &iop->pathinfo );
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rtems_libio_iop_drop( iop );
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if ( rv == 0 ) {
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rv = rtems_filesystem_chdir( &loc );
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}
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return rv;
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}
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