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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief RTEMS Extend Heap via Sbrk
* @ingroup MallocSupport
*/
/*
* Copyright (c) 2012 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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