tt_result_t tt_dns_create_ntv(IN ares_channel ch)
{
if (ch->nservers != 0) {
__dskt_t *dskt;
int i;
dskt = tt_malloc(sizeof(__dskt_t) * __DSKT_NUM(ch));
if (dskt == NULL) {
TT_ERROR("no mem for dns wov");
return TT_FAIL;
}
for (i = 0; i < __DSKT_NUM(ch); ++i) {
__dskt_init(&dskt[i], ch);
}
// save dskt in ch->sock_create_cb_data. note ares_dup()
// would copy the pointer, then two ares_channels would
// share same dskts, which is not expected, so must do a
// "deep copy" if ares_dup() is called
ares_set_socket_callback(ch, NULL, dskt);
}
ares_set_socket_functions(ch, &__dskt_itf, ch);
return TT_SUCCESS;
}
static ph_dns_channel_t *create_chan(void)
{
ph_dns_channel_t *chan;
struct ares_options opts;
int res;
pthread_mutexattr_t attr;
chan = ph_mem_alloc(mt.chan);
if (!chan) {
return NULL;
}
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&chan->chanlock, &attr);
pthread_mutexattr_destroy(&attr);
if (ph_ht_init(&chan->sock_map, 4, &sock_key, &ph_ht_ptr_val_def) != PH_OK) {
ph_panic("failed to init sock map");
}
memset(&opts, 0, sizeof(opts));
opts.sock_state_cb_data = chan;
opts.sock_state_cb = sock_state_cb;
opts.flags = ARES_FLAG_STAYOPEN;
res = ares_init_options(&chan->chan, &opts,
ARES_OPT_SOCK_STATE_CB|ARES_OPT_FLAGS);
if (res != ARES_SUCCESS) {
ph_panic("failed to ares_init_options: %s", ares_strerror(res));
}
ares_set_socket_callback(chan->chan, sock_create_cb, chan);
return chan;
}