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

int main(int argc, char **argv)
{
	pid_t newpid;
    long int timeout = 0;
    char *endptr;
    int status = 100;
    int i = 0;

    if (argc < 2) {
        fprintf(stderr, "Usage: %s <timeout> <command> [args...]\n", argv[0]);
        exit(1);
    }

    timeout = strtol (argv[1], &endptr, 10);
    if (*endptr != '\0') {
        fprintf(stderr, "ERROR: Failed to parse timeout.\n");
        exit(2);
    }

    newpid = fork();
    if (newpid < 0) { perror("fork"); exit(10); }
    else if (newpid == 0) {
        argv += 2;
        execvp(argv[0], argv);
        perror("execvp");
        exit(11);
    }
    while(--timeout >= 0) {
        for (i = 0; i < 10; ++i) {
            if (waitpid(newpid, &status, WNOHANG) == newpid)
                exit(status);
            usleep(100000);
        }
    }
    fprintf(stderr, "TIMEOUT: Kill process %d\n", newpid);
   	kill(newpid, SIGTERM);
    waitpid(newpid, &status, 0);
   	return status;
}