74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/****************************************************************************
|
|
* libs/libc/signal/sig_altstack.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sigaltstack
|
|
*
|
|
* Description:
|
|
* The sigaltstack() function allows a process to define and examine the
|
|
* state of an alternate stack for signal handlers for the current thread.
|
|
* Signals that have been explicitly declared to execute on the alternate
|
|
* stack shall be delivered on the alternate stack.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int sigaltstack(FAR const stack_t *ss, FAR stack_t *oss)
|
|
{
|
|
if (ss)
|
|
{
|
|
if (ss->ss_flags & SS_DISABLE)
|
|
{
|
|
goto out;
|
|
}
|
|
|
|
if (ss->ss_size < MINSIGSTKSZ)
|
|
{
|
|
set_errno(ENOMEM);
|
|
return ERROR;
|
|
}
|
|
|
|
/* not support SS_ONSTACK now */
|
|
|
|
set_errno(EINVAL);
|
|
return ERROR;
|
|
}
|
|
|
|
out:
|
|
if (oss)
|
|
{
|
|
memset(oss, 0, sizeof(*oss));
|
|
oss->ss_flags = SS_DISABLE;
|
|
}
|
|
|
|
return OK;
|
|
}
|