//-------------------------------------------------------------------
//	datetest.cpp
//
//	This program uses the 'fork()', 'execve()' and 'waitpid()'	
//	functions to automate the testing of our 'date' algorithm,
//	provided 'secs2day' is located in your current directory. 
//
//	      compile using:  $ g++ datetest.cpp -o datetest
//	      execute using:  $ ./datetest
//
//	programmer: ALLAN CRUSE
//	written on: 23 FEB 2007
//-------------------------------------------------------------------

#include <time.h>	// for time()
#include <unistd.h>	// for fork(), execve() 
#include <stdio.h>	// for sprintf() 
#include <wait.h>	// for waitpid()

int main( int argc, char **argv )
{
	int	max_seconds = time( NULL );
	int	secs_in_day = 60 * 60 * 24;
	int	max_day = 1 + (max_seconds / secs_in_day);

	for (int day = 1; day <= max_day; day++)
		{
		int	seconds = day * secs_in_day;
		int	pid = fork();
		if ( pid == 0 )
			{
			char	arg0[ ] = "secs2day";
			char	arg1[ 20 ] = {0};
			char	*argv[ ] = { arg0, arg1, 0 };
			sprintf( arg1, "%d", seconds );
			execve( arg0, argv, NULL );
			}
		else	waitpid( pid, NULL, 0 );
		}
}