socket_tcp.c

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#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include "close.h"         /* better use unistd.h ? */
#include "ndelay.h"
#include "socket_if.h"
#include "error.h"
 
#ifndef EAFNOSUPPORT
#define EAFNOSUPPORT EINVAL
#endif
 
int socket_tcp4(void)
{
  int s;
 
  s = socket(AF_INET,SOCK_STREAM,0);
  if (s != -1) 
    if (ndelay_on(s) == -1) { close(s); return -1; }
 
  return s;
}
 
int socket_tcp6(void)
{
  int s;
 
  s = socket(AF_INET6,SOCK_STREAM,0);
  if (s != -1) 
    if (ndelay_on(s) == -1) { close(s); return -1; }
 
  return s;
}
 
int socket_tcp(void)
{
  int s;
 
  s = socket(AF_INET6,SOCK_STREAM,0);
  if (s == -1) 
    if (errno == EINVAL || errno == EAFNOSUPPORT || errno == EPROTO || errno == EPROTONOSUPPORT) 
       s = socket(AF_INET,SOCK_STREAM,0);
 
  if (s != -1) 
    if (ndelay_on(s) == -1) { close(s); return -1; }
 
  return s;
}
 
int socket_tcpnodelay(int s)
{
  int opt = 1;
  return setsockopt(s,IPPROTO_TCP,1,&opt,sizeof(opt)); /* 1 == TCP_NODELAY */
}