#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <signal.h>

void sigHandler(int);
void user1(int);
void user2(int);
pid_t pid, ppid;

int main(int argc, char *argv[])
{

        signal(2, sigHandler);

        signal(SIGUSR1, user1);
        signal(SIGUSR2, user2);
        if((pid = fork()) < 0)
        {
                perror("fork failed");
                exit(1);
        }else if(!pid)
        {
                        printf("spawned child PID# %d\n", getpid());
                        while(1)
                        {
                                int n;
                                n = rand() %  2;
                                if(n == 1)
                                        kill(getpid(), SIGUSR1);
                                else
                                        kill(getpid(), SIGUSR2);
                                sleep(2);
                        }
        }else{
                printf("waiting...\n");
                pause();
        }
        return 0;
}

void sigHandler(int sigNum)
{
        sleep(1);
        printf("outta here.\n");
        exit(0);

}

void user1(int sigNum)
{
        printf("received a SIGUSR1 interrupt from process %d\n", getpid());

}

void user2(int sigNum)
{
        printf("received a SIGUSR2 interrupt from process %d\n", getpid());

}