#include <netinet/in.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <errno.h>

#include "close.h" /* better use unistd.h ? */
#include "error.h"
#include "ndelay.h"
#include "socket_if.h"

#ifndef EAFNOSUPPORT
  #define EAFNOSUPPORT EINVAL
#endif

/**
  @file socket_udp.c
  @authors djb, fefe, feh
  @ref ucspi-tcp6
  @brief setup a UDP message socket
*/

int socket_udp6(void)
{
  int s = socket(AF_INET6, SOCK_DGRAM, 0);
  if (s != -1)
    if (ndelay_on(s) == -1) {
      close(s);
      return -1;
    }

  return s;
}

int socket_udp4(void)
{
  int s = socket(AF_INET, SOCK_DGRAM, 0);
  if (s != -1)
    if (ndelay_on(s) == -1) {
      close(s);
      return -1;
    }

  return s;
}

int socket_udp(void)
{
  int s = socket(AF_INET6, SOCK_DGRAM, 0);
  if (s == -1)
    if (errno == EINVAL || errno == EAFNOSUPPORT || errno == EPROTO || errno == EPROTONOSUPPORT)
      s = socket(AF_INET, SOCK_DGRAM, 0);

  if (s != -1)
    if (ndelay_on(s) == -1) {
      close(s);
      return -1;
    }

  return s;
}