#include <sys/socket.h>

int socket_family(int fd) {
  struct sockaddr sockaddr = {};
  socklen_t len = sizeof(sockaddr);

  if (getsockname(fd, &sockaddr, &len) < 0)
    return -1;

  if (len < sizeof(sa_family_t))
    return -1;

  return sockaddr.sa_family;
}

int socket_type(int fd) {
  int type = 0;
  socklen_t len = sizeof(type);

  if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
    return -1;

  return type;
}

int socket_listening(int fd) {
  int accepting = 0;
  socklen_t len = sizeof(accepting);
  if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &len) < 0)
    return -1;
  return accepting;
}