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


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

    if (argv[1] == NULL) {
        printf("Desired amount of child processes must be passed as argument! \n");
        exit(-1);
    }

    char *endp;
    int childQuantity = (int) strtol(argv[1], &endp, 0);
    if (*endp != 0) {
        printf("Conversion from value: %s of type string to value of type long failed! \n", argv[1]);
    }

    int returnStatus;
    pid_t pid;

    for (int i = 0; i < childQuantity; i++) {
        pid = fork();
        if (pid < 0) {
            printf("Fork failed its work! \n");
        }
        if (pid == 0) {
            sleep(1);
        }

        if (pid > 0) {
            waitpid(pid, &returnStatus, 0);
            if (returnStatus == 0) {
                printf("Child process: %d | Parent process: %d \n", getpid(), getppid());
                kill(pid, 2563);
                printf("The child process terminated normally. \n");
                exit(0);
            }
            if (returnStatus == 1) {
                printf("The child process terminated with an error!. \n");
            }
        }
    }

    return 0;
}