#include <signal.h>
#include <stdio.h>
#include <netinet/ip.h>
#define OFFSET(type, attr) printf("%s %d\n", #attr, &(((type*) 0)->attr))

int main() {
  OFFSET(struct sockaddr_in, sin_family);
  OFFSET(struct sockaddr_in, sin_port);
  OFFSET(struct sockaddr_in, sin_addr);
  printf("%d\n", sizeof(struct sockaddr_in));

  OFFSET(struct sigaction, sa_handler);
  OFFSET(struct sigaction, sa_mask);
  OFFSET(struct sigaction, sa_flags);
  OFFSET(struct sigaction, sa_restorer);
}