#include<stdio.h>
#include<signal.h>
#include <stdarg.h>

void intermithandler(int signumber);
void continuehandler(int signumber);
void terminatehandler(int signumber);

int main(void)
{
    	char buffer[100];

    	if(signal(SIGINT,&terminatehandler)==SIG_ERR)
    	{
        	printf("Couldn’t register signal handler! \n");
    	}
    	if(signal(SIGTSTP,&terminatehandler)==SIG_ERR)
    	{
        	printf("Couldn’t register signal handler! \n");
    	}
    	if(signal(SIGCONT,&continuehandler)==SIG_ERR)
    	{
        	printf("Couldn’t register signal handler! \n");
    	}
    	if(signal(SIGTERM,&terminatehandler)==SIG_ERR)
    	{
        	printf("Couldn’t register signal handler! \n");
    	}
    
    	printf("Pid of This Process:%6d.", getpid());

    	for( ; ; )
    	{
        	fgets(buffer,sizeof(buffer),stdin);
        	if(strcmp(buffer,"intermit\n")==0)
        	{
            		raise(SIGINT);
        	}
        	else if(strcmp(buffer,"stop\n")==0)
        	{
            		raise(SIGTSTP);
		}
		else if(strcmp(buffer,"continue\n")==0)
		{
    			raise(SIGCONT);
		}
		else if(strcmp(buffer,"quit\n")==0)
		{
    			raise(SIGTERM);
		}
        	else
        	{
            		printf("Your input is: %s\n\n",buffer);
        	}
     	}
     	return 0;
}

void intermithandler(int signumber)
{
   	printf("signal %d.;\n",signumber);
}

void continuehandler(int sinnumber)
{
   	printf("Continue code.\n");
}
void terminatehandler(int signumber)
{
	printf("signal SIGTERM.\n");
    	return;
}