DNS/dnscache/sockaddr_inについて、ここに記述してください。
/usr/include/netinet/in.h
/* Socket address, internet style. */
struct sockaddr_in {
uint8_t sin_len;
sa_family_t sin_family;
in_port_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
----
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "byte.h"
#include "socket.h"
int socket_recv4(int s,char *buf,int len,char ip[4],uint16 *port)
{
struct sockaddr_in sa;
int dummy = sizeof sa;
int r;
r = recvfrom(s,buf,len,0,(struct sockaddr *) &sa,&dummy);
if (r == -1) return -1;
byte_copy(ip,4,(char *) &sa.sin_addr);
uint16_unpack_big((char *) &sa.sin_port,port);
return r;
} 