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/**
* @file
*
* @brief RTEMS Extend Heap via Sbrk
* @ingroup MallocSupport
*/
/*
* Copyright (c) 2012 embedded brains GmbH. All rights reserved.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#include <rtems/malloc.h>
#include "malloc_p.h"
static ptrdiff_t RTEMS_Malloc_Sbrk_amount;
void rtems_heap_set_sbrk_amount( ptrdiff_t sbrk_amount )
{
RTEMS_Malloc_Sbrk_amount = sbrk_amount;
}
void *rtems_heap_extend_via_sbrk(
Heap_Control *heap,
size_t alloc_size
)
{
ptrdiff_t sbrk_amount = RTEMS_Malloc_Sbrk_amount;
ptrdiff_t sbrk_size = (ptrdiff_t) alloc_size;
ptrdiff_t misaligned = sbrk_amount != 0 ? sbrk_size % sbrk_amount : 0;
void *return_this = NULL;
if ( misaligned != 0 ) {
sbrk_size += sbrk_amount - misaligned;
}
if ( sbrk_size > 0 && sbrk_amount > 0 ) {
void *area_begin = sbrk( sbrk_size );
if ( area_begin != (void *) -1 ) {
bool ok = _Protected_heap_Extend( heap, area_begin, sbrk_size );
if ( ok ) {
return_this = _Protected_heap_Allocate( heap, alloc_size );
} else {
sbrk( -sbrk_size );
}
}
}
return return_this;
}
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