cap_connect
error = cap_connect(capnet, fd, res->ai_addr, res->ai_addrlen);
int cap_connect(cap_channel_t *chan, int s, const struct sockaddr *name,
error = cap_connect(capnet, s, res->ai_addr,
error = cap_connect(capnet, s, (struct sockaddr *)&connaddr,
ret = cap_connect(chan, capfd, (struct sockaddr *)&ipv4, sizeof(ipv4));