CrearSemFumadores.cpp

#include <fcntl.h>           /* For O_* constants */
#include <sys/stat.h>        /* For mode constants */
#include <semaphore.h>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cerrno>

using namespace std;

int
main(void) {
  const char *nombres[] = { "notabaco", "nopapel", "nocerilla" };
  sem_t *semaforos[3];

  for (long unsigned i = 0; i < 3; ++i) {
    semaforos[i] = sem_open(nombres[i],
                O_CREAT | O_EXCL,
                S_IRUSR | S_IWUSR  | S_IRGRP | S_IWGRP, 0);
    if (semaforos[i] == nullptr) {
      cerr << "Error creando los semaforos: " << strerror(errno) << endl;
    }

    sem_close(semaforos[i]);
  }

  return EXIT_SUCCESS;
}