#include <sys/types.h>
#ifndef __MINGW32__
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#include "socket.h"
#include "ndelay.h"
#include <errno.h>

int socket_tcp4(void) {
  int s;
#ifdef SOCK_NONBLOCK
  if ((s=socket(PF_INET,SOCK_STREAM|SOCK_NONBLOCK,IPPROTO_TCP))>-1 || errno!=EINVAL) return s;
#endif
  s=socket_tcp4b();
  if (s==-1) return -1;
  if (ndelay_on(s) == -1) { close(s); return -1; }
  return s;
}