//
// Written for Computer Networks and Systems lab classes
// AUTHOR : Sergiusz Warga

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

void child_task() {
    execl("/usr/bin/cal", "cal", "2021", NULL);
}

int main() {
    pid_t pid;
    int status;

    pid = fork();

    if (pid == -1) {    // If something went wrong.
        perror("Fork: ");
        exit(EXIT_FAILURE);
    }

    if (pid == 0) {     // If this is a child process.
        child_task();
        exit(EXIT_SUCCESS);
    }

    wait(&status);
    return 0;
}