#include <iostream>
#include <fcntl.h>
#include <sys/stat.h>
#include <semaphore.h>
#include <unistd.h>
#include <cstdlib>
#include <cstring>
#include <cerrno>

using namespace std;

static void usage(char *progname);

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

  if (argc != 2) usage(argv[0]);

  sem_t *sem;

  if ((sem = sem_open(argv[1],
		      O_CREAT | O_EXCL,
		      0660,
		      0)) == SEM_FAILED) {
    cerr << "Error creando el semaforo: " <<
      strerror(errno) << endl;
    return EXIT_FAILURE;
  }

  sem_close(sem);

  return EXIT_SUCCESS;
}

static void usage(char *progname) {
  cerr << "Uso: " << progname
       << " <nombresem> "
       << endl;
  exit(EXIT_FAILURE);
}