#include 	<signal.h>
#include	<sys/types.h>
#include	<sys/wait.h>
#include	<stdio.h>
#include 	<stdlib.h>
#include 	<math.h>
#define 	BUFFSIZE 256

int contaPari=0, contaDispari=0, isDone=0;

void stopReceiver(int signal) {
    if(signal==SIGTERM){
        printf("Ricevuti %i pari ed %i dispari\n", contaPari, contaDispari);
        isDone = 1;
    }  
}

void contaSegnali(int signal){   
    if(signal==SIGHUP) {
        contaPari++;
    } else if (signal==SIGINT){
        contaDispari++;
    }
}

void generator(pid_t receiver) {   
    double randomUniform;
    int i, buffer[BUFFSIZE],r1;
    float r;
    
    /* controllo di parita' e invio del segnale  */
    for(i=0; i<BUFFSIZE; i++) {
	r=(float)rand()/RAND_MAX; r1=floor(r*BUFFSIZE);
	//printf("r=%f R1=%d\n",r,r1);
        if(r1 % 2 == 0) {
            kill(receiver, SIGHUP);
        } else {
            kill(receiver, SIGINT);
        }
        usleep(1e6); 
    }
    kill(receiver, SIGTERM); /* fine */
    
}

void receiver() {
	/* inizializzazione delle sigaction */
	struct sigaction count_action, stop_action;

	count_action.sa_flags=0;
	stop_action.sa_flags=0;
	sigemptyset(&count_action.sa_mask);
	sigemptyset(&stop_action.sa_mask);

	count_action.sa_handler=contaSegnali;
	stop_action.sa_handler=stopReceiver;

    /* registrazione dei signal handler */
	sigaction(SIGHUP, &count_action, NULL);
	sigaction(SIGINT, &count_action, NULL);
        sigaction(SIGTERM, &stop_action, NULL);
    
    	while(!isDone);/* busy wait */
}

int main() {
//segnali-esempio.c
	pid_t pid = fork();
	if( pid == 0 ) {
	    receiver();
	} else {
	    sleep(1);
	    generator(pid);
	    waitpid(pid, NULL, 0);
	}
     return 0;
}