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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Allows calling process to examine action of a Specific Signal
*/
/*
* 3.3.4 Examine and Change Signal Action, P1003.1b-1993, p. 70
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* 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 <pthread.h>
#include <signal.h>
#include <errno.h>
#include <rtems/posix/psignalimpl.h>
#include <rtems/seterr.h>
int sigaction(
int sig,
const struct sigaction *__restrict act,
struct sigaction *__restrict oact
)
{
Thread_queue_Context queue_context;
if ( !sig )
rtems_set_errno_and_return_minus_one( EINVAL );
if ( !is_valid_signo(sig) )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* Some signals cannot be ignored (P1003.1b-1993, pp. 70-72 and references.
*
* NOTE: Solaris documentation claims to "silently enforce" this which
* contradicts the POSIX specification.
*/
if ( sig == SIGKILL )
rtems_set_errno_and_return_minus_one( EINVAL );
_Thread_queue_Context_initialize( &queue_context );
_POSIX_signals_Acquire( &queue_context );
if ( oact )
*oact = _POSIX_signals_Vectors[ sig ];
/*
* Evaluate the new action structure and set the global signal vector
* appropriately.
*/
if ( act ) {
/*
* Unless the user is installing the default signal actions, then
* we can just copy the provided sigaction structure into the vectors.
*/
if ( act->sa_handler == SIG_DFL ) {
_POSIX_signals_Vectors[ sig ] = _POSIX_signals_Default_vectors[ sig ];
} else {
_POSIX_signals_Clear_process_signals( sig );
_POSIX_signals_Vectors[ sig ] = *act;
}
}
_POSIX_signals_Release( &queue_context );
return 0;
}
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