izziv9.c

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>

char sign;
int energy;

void moreEnergy() {
    energy += 10;
    printf("Juhu! Nova energija! (%d).\n", energy);
}

void changeSign() {
    sign = sign == '.' ? '*' : '.';
}

void newProcess() {
    int child = fork();
    if(child == 0) {
        sleep((energy % 7) + 1);
        int status = (42 * energy) % 128;
        printf("Izhodni status childa: %d\n", status);
        exit(status);
    }
    else if(child > 0)
        printf("PID fork childa: %d\n", child);
}

void killZombie() {
    int status;
    wait(&status);
    if(WIFEXITED(status)) {
        status = WEXITSTATUS(status);
        printf("Status zombija: %d\n", status);
    }
}

int main(int argc, char* argv[]) {
    signal(SIGTERM, moreEnergy);
    signal(SIGUSR1, changeSign);
    signal(SIGUSR2, newProcess);
    signal(SIGCHLD, killZombie);

    printf("PID: %d\n", getpid());

    energy = argc == 1 ? 42 : atoi(argv[1]);
    sign = '.';

    while(energy > 0) {
        printf("%c", sign);
        fflush(0);
        sleep(1);
        energy--;
    }

    printf("\nOut of energy!\n");
    return 0;
}