static void sigint_handler(int signo) //Ana Filipa da Cruz Fernandes e Helder Alexandre Santos Moreira
{
    signal(SIGINT, SIG_IGN);
    if (pid_child != -1) {
        kill(pid_child,SIGKILL);
        printf("\n");
    }
    else write(STDOUT_FILENO,"\nmsh_v6>>",9);

    pid_child = -1;

    signal(SIGINT, sigint_handler);
}

if(signal(SIGINT, sigint_handler) < 0)
        return 1;