/*
 * Copyright (c) 2004, 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 assertion:
 *
 * If the calling thread is the last thread in the process, 
 * the effect are as if an implicit call to exit(0) had been made.
 
 * The steps are:
 *
 * -> main creates a thread.
 * -> this thread forks(). The new process contains only 1 thread.
 * -> the thread in the new process calls pthread_exit(non-0 value).
 * -> main process joins the child process and checks the behavior 
 *     is as if exit(0) had been called.
 *     The checked items are:
 *       -> the return value.
 *       -> the atexit() routines have been called.
  */
 
 
 /* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
 #define _POSIX_C_SOURCE 200112L
 
 /* Some routines are part of the XSI Extensions */
#ifndef WITHOUT_XOPEN
 #define _XOPEN_SOURCE	600
#endif

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

 #include <sched.h>
 #include <semaphore.h>
 #include <errno.h>
 #include <assert.h>
 #include <sys/wait.h>
 #include <sys/mman.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 cases  *****************************************/
/********************************************************************************************/

#include "threads_scenarii.c"

/* This file will define the following objects:
 * scenarii: array of struct __scenario type.
 * NSCENAR : macro giving the total # of scenarii
 * scenar_init(): function to call before use the scenarii array.
 * scenar_fini(): function to call after end of use of the scenarii array.
 */

/********************************************************************************************/
/***********************************    Real Test   *****************************************/
/********************************************************************************************/

/* This will be used to control that atexit() has been called */
int * ctl;
long mf;

void clnp(void)
{
	*ctl = 1;
}

/* Thread routine */
void * threaded (void * arg)
{
	int ret = 0;
	
	pid_t pid, chk;
	int status;
	
	if (mf > 0)
		*ctl = 0;
	
	pid = fork();
	if (pid == (pid_t)-1)
	{
		UNRESOLVED(errno, "Failed to fork()");
	}
	if (pid == 0)
	{
		/* children */
		if (mf > 0)
		{
			ret = atexit(clnp);
			if (ret != 0)  {  UNRESOLVED(ret, "Failed to register atexit function");  }
		}
		
		/* exit the last (and only) thread */
		pthread_exit(&ret);
		
		FAILED("pthread_exit() did not terminate the process when there was only 1 thread"); 
	}
	
	/* Only the parent process goes this far */
	chk = waitpid(pid, &status, 0);
	if (chk != pid)
	{
		output("Expected pid: %i. Got %i\n", (int)pid, (int)chk);
		UNRESOLVED(errno, "Waitpid failed"); 
	}
	
	if (WIFSIGNALED(status))
	{ 
		output("Child process killed with signal %d\n",WTERMSIG(status)); 
		UNRESOLVED( -1 , "Child process was killed"); 
	}
	
	if (WIFEXITED(status))
	{
		ret = WEXITSTATUS(status);
	}
	else
	{
		UNRESOLVED( -1, "Child process was neither killed nor exited");
	}
	
	if (ret != 0)
	{
		output("Exit status was: %i\n", ret);
		FAILED("The child process did not exit with 0 status.");
	}
	
	if (mf > 0)
		if (*ctl != 1)
			FAILED("pthread_exit() in the last thread did not execute atexit() routines");
	
	
	/* Signal we're done (especially in case of a detached thread) */
	do { ret = sem_post(&scenarii[sc].sem); }
	while ((ret == -1) && (errno == EINTR));
	if (ret == -1)  {  UNRESOLVED(errno, "Failed to wait for the semaphore");  }
	
	return NULL;
}

/* Main routine */
int main (int argc, char *argv[])
{
	int ret=0;
	pthread_t child;
	
	mf =sysconf(_SC_MAPPED_FILES);
	
	output_init();
	
	scenar_init();
	
	/* We want to share some memory with the child process */
	if (mf> 0)
	{
		/* We will place the test data in a mmaped file */
		char filename[] = "/tmp/pthread_exit_6-1-XXXXXX";
		size_t sz;
		void * mmaped;
		int fd;
		char * tmp;
		
		/* We now create the temp files */
		fd = mkstemp(filename);
		if (fd == -1)
		{ UNRESOLVED(errno, "Temporary file could not be created"); }
		
		/* and make sure the file will be deleted when closed */
		unlink(filename);
		
		#if VERBOSE > 1
		output("Temp file created (%s).\n", filename);
		#endif
		
		sz= (size_t)sysconf(_SC_PAGESIZE);
		
		tmp = calloc(1, sz);
		if (tmp == NULL)
		{ UNRESOLVED(errno, "Memory allocation failed"); }
		
		/* Write the data to the file.  */
		if (write (fd, tmp, sz) != (ssize_t) sz)
		{ UNRESOLVED(sz, "Writting to the file failed"); }
		
		free(tmp);
		
		/* Now we can map the file in memory */
		mmaped = mmap(NULL, sz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
		if (mmaped == MAP_FAILED)
		{ UNRESOLVED(errno, "mmap failed"); }
		
		ctl = (int *) mmaped;
		
		/* Our datatest structure is now in shared memory */
		#if VERBOSE > 1
		output("Testdata allocated in shared memory.\n");
		#endif
	}
	
	for (sc=0; sc < NSCENAR; sc++)
	{
		#if VERBOSE > 0
		output("-----\n");
		output("Starting test with scenario (%i): %s\n", sc, scenarii[sc].descr);
		#endif
		
		ret = pthread_create(&child, &scenarii[sc].ta, threaded, &ctl);
		switch (scenarii[sc].result)
		{
			case 0: /* Operation was expected to succeed */
				if (ret != 0)  {  UNRESOLVED(ret, "Failed to create this thread");  }
				break;
			
			case 1: /* Operation was expected to fail */
				if (ret == 0)  {  UNRESOLVED(-1, "An error was expected but the thread creation succeeded");  }
				break;
			
			case 2: /* We did not know the expected result */
			default:
				#if VERBOSE > 0
				if (ret == 0)
					{ output("Thread has been created successfully for this scenario\n"); }
				else
					{ output("Thread creation failed with the error: %s\n", strerror(ret)); }
				#endif
		}
		if (ret == 0) /* The new thread is running */
		{
			if (scenarii[sc].detached == 0)
			{
				ret = pthread_join(child, NULL);
				if (ret != 0)  {  UNRESOLVED(ret, "Unable to join a thread");  }
			}
			else
			{
				/* Just wait for the thread to terminate */
				do { ret = sem_wait(&scenarii[sc].sem); }
				while ((ret == -1) && (errno == EINTR));
				if (ret == -1)  {  UNRESOLVED(errno, "Failed to wait for the semaphore");  }
			}
		}
	}
	
	scenar_fini();
	#if VERBOSE > 0
	output("-----\n");
	output("All test data destroyed\n");
	output("Test PASSED\n");
	#endif
	
	PASSED;
}