forked from Imagelibrary/rtems
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
/**
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* @file
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*
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* @brief Change File Modes
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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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* 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 <sys/stat.h>
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#include <rtems/libio_.h>
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int rtems_filesystem_chmod(
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const rtems_filesystem_location_info_t *loc,
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mode_t mode
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)
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{
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const rtems_filesystem_mount_table_entry_t *mt_entry = loc->mt_entry;
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int rv;
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if ( mt_entry->writeable || rtems_filesystem_location_is_null( loc ) ) {
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struct stat st;
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memset( &st, 0, sizeof(st) );
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rv = (*loc->handlers->fstat_h)( loc, &st );
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if ( rv == 0 ) {
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uid_t uid = geteuid();
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if ( uid == 0 || st.st_uid == uid ) {
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mode_t mask = S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX;
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mode = (st.st_mode & ~mask) | (mode & mask);
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rv = (*mt_entry->ops->fchmod_h)( loc, mode );
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} else {
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errno = EPERM;
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rv = -1;
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}
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}
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} else {
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errno = EROFS;
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rv = -1;
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}
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return rv;
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}
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/**
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* POSIX 1003.1b 5.6.4 - Change File Modes
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*/
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int fchmod( int fd, mode_t mode )
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{
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int rv;
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rtems_libio_t *iop;
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rtems_libio_check_fd( fd );
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iop = rtems_libio_iop( fd );
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rtems_libio_check_is_open(iop);
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rtems_filesystem_instance_lock( &iop->pathinfo );
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rv = rtems_filesystem_chmod( &iop->pathinfo, mode );
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rtems_filesystem_instance_unlock( &iop->pathinfo );
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return rv;
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}
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