/*
* 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:
*
* pthread_atfork registers the 'prepare' handler to be called before fork() 
* processing in the context of the fork() calling thread.
*
* pthread_atfork registers the 'parent' handler to be called after fork() 
* processing in the context of the fork() calling thread in the parent process.
*
* pthread_atfork registers the 'child' handler to be called after fork() 
* processing in the context of the fork() calling thread in the child process. 


* The steps are:
* -> Create a new thread
* -> Call pthread_atfork from the main thread.
* -> Child thread forks.
* -> Check that the handlers have been called, and in the context of the 
*    calling thread.

* The test fails if the thread executing the handlers is not the one expected,
* or if the handlers are not executed.

*/


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

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

#include <sys/wait.h>
#include <errno.h>


/******************************************************************************/
/***************************   Test framework   *******************************/
/******************************************************************************/
#include "testfrmw.h"
#include "testfrmw.c" 
/* 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.
 */

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

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

pthread_t threads[ 3 ];
pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
pthread_t ch;

/* at fork handlers */
void prepare( void )
{
	threads[ 0 ] = pthread_self();
}

void parent( void )
{
	threads[ 1 ] = pthread_self();
}

void child( void )
{
	threads[ 2 ] = pthread_self();
}


/* Thread function */
void * threaded( void * arg )
{
	int ret, status;
	pid_t child, ctl;

	/* Wait main thread has registered the handler */
	ret = pthread_mutex_lock( &mtx );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to lock mutex" );
	}

	ret = pthread_mutex_unlock( &mtx );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to unlock mutex" );
	}

	/* fork */
	child = fork();

	if ( child == ( pid_t ) - 1 )
	{
		UNRESOLVED( errno, "Failed to fork" );
	}

	/* child */
	if ( child == ( pid_t ) 0 )
	{
		if ( !pthread_equal( ch, threads[ 0 ] ) )
		{
			FAILED( "prepare handler was not called in the thread s context" );
		}

		if ( !pthread_equal( pthread_self(), threads[ 2 ] ) )
		{
			FAILED( "child handler was not called in the thread s context" );
		}

		/* We're done */
		exit( PTS_PASS );
	}

	if ( !pthread_equal( ch, threads[ 0 ] ) )
	{
		FAILED( "prepare handler was not called in the thread s context" );
	}

	if ( !pthread_equal( pthread_self(), threads[ 1 ] ) )
	{
		FAILED( "parent handler was not called in the thread s context" );
	}

	/* Parent joins the child */
	ctl = waitpid( child, &status, 0 );

	if ( ctl != child )
	{
		UNRESOLVED( errno, "Waitpid returned the wrong PID" );
	}

	if ( ( !WIFEXITED( status ) ) || ( WEXITSTATUS( status ) != PTS_PASS ) )
	{
		FAILED( "Child exited abnormally" );
	}

	/* quit */
	return NULL;
}

/* The main test function. */
int main( int argc, char * argv[] )
{
	int ret;

	/* Initialize output */
	output_init();

	ret = pthread_mutex_lock( &mtx );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to lock mutex" );
	}

	ret = pthread_create( &ch, NULL, threaded, NULL );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to create a thread" );
	}

	/* Register the handlers */
	ret = pthread_atfork( prepare, parent, child );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to register the atfork handlers" );
	}

	/* Let the child go on */
	ret = pthread_mutex_unlock( &mtx );

	if ( ret != 0 )
	{
		UNRESOLVED( ret, "Failed to unlock mutex" );
	}

	ret = pthread_join( ch, NULL );

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

	/* Test passed */
#if VERBOSE > 0

	output( "Test passed\n" );

#endif

	PASSED;
}