#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <semaphore.h>

#define MIN_N 1
#define MAX_N 15
#define MIN_M 5
#define MAX_M 20

#define SEMAPHORE_NAME "/gate"
#define SHM_NAME "/houses"

#define ERR(source)                                     \
    do                                                  \
    {                                                   \
        fprintf(stderr, "%s:%d\n", __FILE__, __LINE__); \
        perror(source);                                 \
        kill(0, SIGKILL);                               \
        exit(EXIT_FAILURE);                             \
    } while (0)

void usage(char* program_name)
{
    fprintf(stderr, "Usage: \n");
    fprintf(stderr, "\t%s n m\n", program_name);
    fprintf(stderr, "\t  n - number of townhouses, %d <= n <= %d\n", MIN_N, MAX_N);
    fprintf(stderr, "\t  m - number of nobles, %d <= m <= %d\n", MIN_M, MAX_M);
    exit(EXIT_FAILURE);
}

void ms_sleep(unsigned int milli)
{
    time_t sec = (int)(milli / 1000);
    milli = milli - (sec * 1000);
    struct timespec ts = {0};
    ts.tv_sec = sec;
    ts.tv_nsec = milli * 1000000L;
    if (nanosleep(&ts, &ts))
        ERR("nanosleep");
}

int main(int argc, char** argv) 
{ 
    usage(argv[0]);
}