forked from Imagelibrary/rtems
baef823cd5
Check iop reference count in close() and return -1 with errno set to EBUSY in case the file descriptor is still in use. Update #3132.
70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/**
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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.
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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 <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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