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/*
* mmap() - POSIX 1003.1b 6.3.1 - map pages of memory
*
* COPYRIGHT (c) 2012.
* Chris Johns (chrisj@rtems.org)
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/mman.h>
#include "mmap-internal.h"
int munmap(
void *addr, size_t len
)
{
mmap_mapping* mapping;
rtems_chain_node* node;
/*
* Clear errno.
*/
errno = 0;
/*
* Length cannot be 0.
*/
if ( len == 0 ) {
errno = EINVAL;
return -1;
}
/*
* Obtain the mmap lock. Sets errno on failure.
*/
if ( !mmap_mappings_lock_obtain( ))
return -1;
node = rtems_chain_first (&mmap_mappings);
while ( !rtems_chain_is_tail( &mmap_mappings, node )) {
/*
* If the map is fixed see if this address is already mapped. At this
* point in time if there is an overlap in the mappings we return an
* error.
*/
mapping = (mmap_mapping*) node;
if ( ( addr >= mapping->addr ) &&
( addr < ( mapping->addr + mapping->len )) ) {
rtems_chain_extract( node );
if (( mapping->flags & MAP_FIXED ) != MAP_FIXED ) {
free( mapping->addr );
free( mapping );
}
break;
}
node = rtems_chain_next( node );
}
mmap_mappings_lock_release( );
return 0;
}
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