socket_bind.c

   1 #include <sys/types.h>
   2 #include <sys/param.h>
   3 #include <sys/socket.h>
   4 #include <netinet/in.h>
   5 #include "byte.h"
   6 #include "socket.h"
   7
   8 int socket_bind4(int s,char ip[4],uint16 port)
   9 {
  10   struct sockaddr_in sa;
  11
  12   byte_zero(&sa,sizeof sa);
  13   sa.sin_family = AF_INET;
  14   uint16_pack_big((char *) &sa.sin_port,port);
  15   byte_copy((char *) &sa.sin_addr,4,ip);
  16
  17   return bind(s,(struct sockaddr *) &sa,sizeof sa);
  18 }
  19
  20 int socket_bind4_reuse(int s,char ip[4],uint16 port)
  21 {
  22   int opt = 1;
  23   setsockopt(s,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof opt);
  24   return socket_bind4(s,ip,port);
  25 }
  26
  27 void socket_tryreservein(int s,int size)
  28 {
  29   while (size >= 1024) {
  30     if (setsockopt(s,SOL_SOCKET,SO_RCVBUF,&size,sizeof size) == 0) return;
  31     size -= (size >> 5);
  32   }
  33 }