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/**
* @file
*
* @brief Allows calling process to examine action of a Specific Signal
* @ingroup POSIXAPI
*/
/*
* 3.3.4 Examine and Change Signal Action, P1003.1b-1993, p. 70
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* 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 <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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