#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stddef.h>

static const char s_socketpath[] = "/tmp/test.sn.sock";

void die(int x, const char *s)
{
  perror(s);
  unlink(s_socketpath);
  exit(x);
}

int main()
{
  int ret;
  int s;
  struct sockaddr_un sock;
  char namebuf[256];
  socklen_t bufsize = sizeof(namebuf);

  namebuf[0] = 'a';
  namebuf[1] = 0;

  memset(&sock, 0, sizeof(sock));
  sock.sun_family = AF_UNIX;
  strcpy(sock.sun_path, s_socketpath);

  s = socket(AF_UNIX, SOCK_STREAM, PF_UNSPEC);
  if (s < 0) die(1, "socket");

  ret = bind(s, (struct sockaddr *)&sock, sizeof(sock));
  if (ret < 0) die(2, "bind");

  ret = getsockname(s, (struct sockaddr *)namebuf, &bufsize);
  {
    struct sockaddr_un *ss = (struct sockaddr_un *)namebuf;
    printf("> getsockname: %d, %d ('%s') vs %u/%u\n", ret, bufsize, namebuf, offsetof(struct sockaddr, sa_data) + strlen(ss->sun_path) + 1,sizeof(sock));
    printf("> ... %d vs %d, %s (%u)\n", ss->sun_family, AF_UNIX, ss->sun_path, strlen(ss->sun_path));
  }
  if (ret < 0) die(3, "getsockname");

  shutdown(s, SHUT_RDWR);
  close(s);

  unlink(s_socketpath);

  return 0;
}