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98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (c) 2012 Chris Johns (chrisj@rtems.org)
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* Copyright (c) 2017 Gedare Bloom (gedare@rtems.org)
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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 <rtems.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <rtems/posix/mmanimpl.h>
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#include <rtems/posix/shmimpl.h>
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int munmap(void *addr, size_t len)
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{
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mmap_mapping *mapping;
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rtems_chain_node *node;
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/*
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* Clear errno.
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*/
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errno = 0;
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/*
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* Length cannot be 0.
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*/
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if ( len == 0 ) {
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errno = EINVAL;
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return -1;
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}
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/* Check for illegal addresses. Watch out for address wrap. */
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if (addr + len < addr) {
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errno = EINVAL;
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return -1;
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}
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mmap_mappings_lock_obtain();
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node = rtems_chain_first (&mmap_mappings);
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while ( !rtems_chain_is_tail( &mmap_mappings, node )) {
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mapping = (mmap_mapping*) node;
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if ( ( addr >= mapping->addr ) &&
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( addr < ( mapping->addr + mapping->len )) ) {
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rtems_chain_extract_unprotected( node );
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/* FIXME: generally need a way to clean-up the backing object, but
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* currently it only matters for MAP_SHARED shm objects. */
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if ( mapping->shm != NULL ) {
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POSIX_Shm_Attempt_delete(mapping->shm);
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}
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/* only free the mapping address for non-fixed mapping */
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if (( mapping->flags & MAP_FIXED ) != MAP_FIXED ) {
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/* only free the mapping address for non-shared mapping, because we
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* re-use the mapping address across all of the shared mappings, and
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* it is memory managed independently... */
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if (( mapping->flags & MAP_SHARED ) != MAP_SHARED ) {
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free( mapping->addr );
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}
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}
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free( mapping );
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break;
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}
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node = rtems_chain_next( node );
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}
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mmap_mappings_lock_release( );
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return 0;
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}
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