/* delayed_kill.c -- sleep briefly, then send a signal to the target pid */#include <signal.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h> int main(int argc, char *argv[]) {    if (argc < 4) {        fprintf(stderr, "usage: delayed_kill <delay_ms> <pid> <signal>\n");        return 1;    }     int delay_ms = atoi(argv[1]);    pid_t pid = (pid_t)atoi(argv[2]);    int signal_number = atoi(argv[3]);     if (delay_ms > 0) {        usleep((useconds_t)delay_ms * 1000u);    }     return kill(pid, signal_number) == 0 ? 0 : 1;}