73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/****************************************************************************
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* mm/kmm_heap/kmm_sbrk.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/mm/mm.h>
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#if defined(CONFIG_BUILD_KERNEL) && defined(__KERNEL__)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: kmm_sbrk
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*
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* Description:
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* The sbrk() function is used to change the amount of space allocated
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* for the calling process. The change is made by resetting the process's
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* break value and allocating the appropriate amount of space. The amount
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* of allocated space increases as the break value increases.
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*
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* The sbrk() function adds 'incr' bytes to the break value and changes
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* the allocated space accordingly. If incr is negative, the amount of
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* allocated space is decreased by incr bytes. The current value of the
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* program break is returned by sbrk(0).
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*
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* Input Parameters:
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* incr - Specifies the number of bytes to add or to remove from the
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* space allocated for the process.
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*
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* Returned Value:
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* Upon successful completion, sbrk() returns the prior break value.
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* Otherwise, it returns (void *)-1 and sets errno to indicate the
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* error:
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*
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* ENOMEM - The requested change would allocate more space than
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* allowed under system limits.
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* EAGAIN - The total amount of system memory available for allocation
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* to this process is temporarily insufficient. This may occur even
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* though the space requested was less than the maximum data segment
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* size.
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*
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****************************************************************************/
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FAR void *kmm_sbrk(intptr_t incr)
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{
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return mm_sbrk(&g_kmmheap, incr, UINTPTR_MAX);
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}
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#endif /* CONFIG_BUILD_KERNEL && __KERNEL__ */
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