socket_bind.c

/* Public domain, from djbdns-1.05. */

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

int socket_bind4(int s,char ip[4],uint16 port)
{
  struct sockaddr_in sa;

  byte_zero((void*)&sa,sizeof sa);
  sa.sin_family = AF_INET;
  uint16_pack_big((char *) &sa.sin_port,port);
  byte_copy((char *) &sa.sin_addr,4,ip);

  return bind(s,(struct sockaddr *) &sa,sizeof sa);
}

int socket_bind4_reuse(int s,char ip[4],uint16 port)
{
  int opt = 1;
  setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof opt);
  return socket_bind4(s,ip,port);
}

void socket_tryreservein(int s,int size)
{
  while (size >= 1024) {
    if (setsockopt(s,SOL_SOCKET,SO_RCVBUF,&size,sizeof size) == 0) return;
    size -= (size >> 5);
  }
}