#include "main.h"

//======================================================================
/*
$ ps aux # a:all users, u:detailled, x:daemons // look at bash  PID


*/
//======================================================================
int main(int argc, char **argv)
{
	int ok;
	int value=100;
	printf("before fork, pid=%d, ppid=%d, value=%d (%p)\n",
			getpid(),getppid(),value,(void *)&value); 

	pid_t child=fork(); //>>>>>>>> CREATE CHILD >>>>>>>>>>>>>>>>>>>>>>>>
  
	switch(child)
	{
		case -1: perror("fork"); return EXIT_FAILURE; break;
		
		//############ CHILD CODE ######################################
		case 0 : 
			value+=10;
			printf("after fork in the child, child=%d, pid=%d, ppid=%d, value=%d (%p)\n",
					child,getpid(),getppid(),value,(void *)&value);
					
			sleep(10);					

			break;		
		
		//############ PARENT CODE #####################################
		default : 
		    value+=1000;
			printf("after fork in the parent, child=%d, pid=%d, ppid=%d, value=%d (%p)\n",
					child,getpid(),getppid(),value,(void *)&value);	
		
		
			int status;
		    pid_t p=waitpid(child,&status,0);	// PARENT MUST WAIT FOR HIS CHILD
								if(p==-1) { perror("waitpid");  return EXIT_FAILURE; }
								
					if (WIFEXITED(status)) 
					{
								printf(" Child ended normaly .\n"
										" Return code : %d.\n", WEXITSTATUS(status));
					}					
					if (WIFSIGNALED(status)) 
					{
								printf(" Child didn't end normaly.\n"
										" killed by signal : %d.\n", WTERMSIG(status));
					}
			break;
	}	
			
return EXIT_SUCCESS;
}
//^^^^^^^^^^^^^^^^^^^^^^^^^^ EOF ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^