SlirpCb
Slirp *slirp_new(const SlirpConfig *cfg, const SlirpCb *callbacks,
const char *vdomainname, const SlirpCb *callbacks,
static const struct SlirpCb slirp_cbs = {
typedef Slirp *(*slirp_new_p_t)(const SlirpConfig *, const SlirpCb *, void *);