/*
* Copyright (c) 2005, Bull S.A..  All rights reserved.
* Created by: Sebastien Decugis

* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.


* This sample test aims to check the following assertions:
*
* If the signal action was set with the signal() function, getting it into oact
then reinstalling it with act must be valid.

* The steps are:
* -> register a signal handler for SIGVTALRM with signal().
* -> check this signal handler works.
* -> change the signal handler with sigaction, saving old handler in oact.
* -> check the new signal handler works.
* -> set the old signal handler back
* -> check the old signal handler still works.

* The test fails if a signal handler does not work as expected.
*/


/* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
#define _POSIX_C_SOURCE 200112L

/******************************************************************************/
/*************************** standard includes ********************************/
/******************************************************************************/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <signal.h>
#include <errno.h>

/******************************************************************************/
/***************************   Test framework   *******************************/
/******************************************************************************/
/* This header is responsible for defining the following macros:
 * UNRESOLVED(ret, descr);  
 *    where descr is a description of the error and ret is an int 
 *   (error code for example)
 * FAILED(descr);
 *    where descr is a short text saying why the test has failed.
 * PASSED();
 *    No parameter.
 * 
 * Both three macros shall terminate the calling process.
 * The testcase shall not terminate in any other maneer.
 * 
 * The other file defines the functions
 * void output_init()
 * void output(char * string, ...)
 * 
 * Those may be used to output information.
 */
#include "posixtest.h"
#include <time.h>
#include <sys/types.h>

#ifdef __GNUC__ /* We are using GCC */

#define UNRESOLVED(x, s) \
 { output("Test %s unresolved: got %i (%s) on line %i (%s)\n", __FILE__, x, strerror(x), __LINE__, s); \
 	output_fini(); \
 	exit(PTS_UNRESOLVED); }

#define FAILED(s) \
 { output("Test %s FAILED: %s\n", __FILE__, s); \
 	output_fini(); \
 	exit(PTS_FAIL); }

#define PASSED \
  output_fini(); \
  exit(PTS_PASS);

#define UNTESTED(s) \
{	output("File %s cannot test: %s\n", __FILE__, s); \
	  output_fini(); \
  exit(PTS_UNTESTED); \
}

#else /* not using GCC */

#define UNRESOLVED(x, s) \
 { output("Test unresolved: got %i (%s) on line %i (%s)\n", x, strerror(x), __LINE__, s); \
  output_fini(); \
 	exit(PTS_UNRESOLVED); }

#define FAILED(s) \
 { output("Test FAILED: %s\n", s); \
  output_fini(); \
 	exit(PTS_FAIL); }

#define PASSED \
  output_fini(); \
  exit(PTS_PASS);

#define UNTESTED(s) \
{	output("Unable to test: %s\n", s); \
	  output_fini(); \
  exit(PTS_UNTESTED); \
}

#endif
void output_init()
{
	/* do nothing */
	return ;
}

void output( char * string, ... )
{
	va_list ap;
#ifndef PLOT_OUTPUT
	char *ts = "[??:??:??]";

	struct tm * now;
	time_t nw;
#endif

#ifndef PLOT_OUTPUT
	nw = time( NULL );
	now = localtime( &nw );

	if ( now == NULL )
		puts( ts );
	else
		printf( "[%2.2d:%2.2d:%2.2d]", now->tm_hour, now->tm_min, now->tm_sec );

#endif
	va_start( ap, string );

	vprintf( string, ap );

	va_end( ap );

}

void output_fini()
{
	/*do nothing */
	return ;
}

/******************************************************************************/
/**************************** Configuration ***********************************/
/******************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

#define SIGNAL SIGVTALRM

/******************************************************************************/
/***************************    Test case   ***********************************/
/******************************************************************************/

sig_atomic_t called = 1;

void handler_1( int sig )
{
	called++;
}

void handler_2( int sig )
{
	called--;
}

/* main function */
int main()
{
	int ret;

	struct sigaction sa, save;

	/* Initialize output */
	output_init();

	/* Register the signal handler with signal */

	if ( SIG_ERR == signal( SIGNAL, handler_1 ) )
	{
		UNRESOLVED( errno, "Failed to register signal handler with signal()" );
	}

	/* As whether signal handler is restored to default when executed
	is implementation defined, we cannot check it was registered here. */

	/* Set the new signal handler with sigaction*/
	sa.sa_flags = 0;

	sa.sa_handler = handler_2;

	ret = sigemptyset( &sa.sa_mask );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to empty signal set" );
	}

	/* Install the signal handler for SIGVTALRM */
	ret = sigaction( SIGNAL, &sa, &save );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to set signal handler" );
	}

	/* Check the signal handler has been set up */
	ret = raise( SIGNAL );

	if ( ret != 0 )
	{
		UNRESOLVED( ret , "Failed to raise the signal" );
	}

	if ( called != 0 )
	{
		FAILED( "handler not executed" );
	}

	/* Restore the first signal handler */
	ret = sigaction( SIGNAL, &save, 0 );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to set signal handler" );
	}

	/* Check the signal handler has been set up */
	ret = raise( SIGNAL );

	if ( ret != 0 )
	{
		UNRESOLVED( ret , "Failed to raise the signal" );
	}

	if ( called != 1 )
	{
		FAILED( "handler not executed" );
	}


	/* Test passed */
#if VERBOSE > 0

	output( "Test passed\n" );

#endif

	PASSED;
}
