Example

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


int counter = 0;
int pid;


void handler (int sig) {
/*  counter++;
    printf ("pid do handler= %d, counter= %d \n", getpid(), counter);
    sleep(1);*/
    return;
}


int main() {
    int i;
    int status;

    signal(SIGUSR2, handler);

    if (fork()==0){
        for (i=0;i<5;i++) {
            kill (getppid(), SIGUSR2);
            printf("sent SIGUSR2 to parent\n");
            WSTOPSIG(1);
            sleep (2);
        }
        exit(0);
    }

    /*while ((pid = waitpid(-1, &status, 0) ) > 0 ) {
        if (..............................) printf("pai esperou por filho %d parado pelo sinal %d\n",
        pid, ..........................................);
        ......................................);
    }*/
//  exit(0);
}