* readfds, writefds, exceptfds and maxfd may not be 0.
*/
+struct pollfd *adns_pollfds(adns_state, struct pollfd *buf, int *len_io, int *timeout);
+/* Like adns_interest, but for use with poll(2). The return value
+ * will be a pointer to an array of struct pollfd, one for each of
+ * adns's fds, and *len_io will be set to the number of file
+ * descriptors.
+ *
+ * Each descriptor's entry will have a revents==0, and events will be
+ * a combination of one or more of POLLIN, POLLOUT and POLLERR.
+ *
+ * *timeout will be adjusted to ensure that it is no more than the
+ * desired timeout (with the usual rule for poll that <0 stands for
+ * infinity). *timeout may be 0 in which case no timeout information
+ * will be returned.
+ *
+ * If *len_io is nonnegative then adns_pollfds will write to buffer
+ * provided by the caller in buf. If it is too small then *len_io
+ * will be updated to say how large it would have needed to be and
+ * adns_pollfds will fail with ENOSPC.
+ *
+ * If *len_io is -1 then buf should be 0, and adns_pollfds will use some
+ * memory belonging to the adns_state, which may be overwritten on subsequent
+ * calls.
+ *
+ * When you come out of poll(2), you should probably call adns_callback
+ * with maxfd==-1.
+ *
+ * On systems without poll(2) this function will return ENOSYS.
+ */
+
/* Example expected/legal calling sequences:
* adns_init
* adns_submit 1
inter_maxtoabs(tv_io,tvbuf,now,qu->timeout);
}
}
-}
+}
+
+static void checkfds(adns_state ads, int *maxfd,
+ fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+ int avail, struct pollfd *buf, int *count_r) {
+ int count;
+
+ count= 0;
+ inter_addfd(ads->udpsocket,maxfd,readfds);
+ poll_addfd(ads->udpsocket,avail,buf,&count,POLLIN);
+
+ switch (ads->tcpstate) {
+ case server_disconnected:
+ break;
+ case server_connecting:
+ inter_addfd(ads->tcpsocket,maxfd,writefds);
+ poll_addfd(ads->tcpsocket,avail,buf,&count,POLLOUT);
+ break;
+ case server_ok:
+ inter_addfd(ads->tcpsocket,maxfd,readfds);
+ inter_addfd(ads->tcpsocket,maxfd,exceptfds);
+ if (ads->tcpsend.used) inter_addfd(ads->tcpsocket,maxfd,writefds);
+ poll_addfd(ads->tcpsocket,avail,buf,&count,
+ ads->tcpsend.used ? POLLIN|POLLOUT : POLLIN);
+ break;
+ default:
+ abort();
+ }
+}
+
+struct pollfd *adns_pollfds(adns_state ads, struct pollfd *buf,
+ int *len_io, int *timeout_io) {
+ struct timeval now, tvbuf, *tvp;
+ int timeout;
+
+ r= gettimeofday(&now,0);
+ if (r) return 0;
+
+ timeout= *timeout_io;
+ if (timeout < 0) {
+ tvtop= 0;
+ } else {
+ tvbuf.tv_sec= now.tv_sec + (timeout/1000);
+ tvbuf.tv_usec= now.tv_usec + (timeout%1000)*1000;
+ if (tvbuf.tv_sec >= 1000000) {
+ tvbuf.tv_sec += 1;
+ tvbuf.tv_usec -= 1000000;
+ }
+ tvp= &tvbuf;
+ }
+ checktimouts(ads,now,&tvp,&tvbuf);
+
+ if (tvp) {
+ assert(tvbuf.tv_sec<INT_MAX/1000);
+ *timeout_io= (tvp->tv_sec - now.tv_sec)*1000 + (tvp->tv_usec - now.tv_usec)/1000;
+ } else {
+ *timeout_io= -1;
+ }
+
+ avail= *len_io;
+ if (avail == -1) {
+ buf= ads->pollfdsbuf;
+ avail= 2;
+ if (!buf) {
+ buf= ads->pollfdsbuf= malloc(sizeof(struct pollfd)*avail);
+ if (!buf) return 0;
+ }
+ }
+ checkfds(ads, 0,0,0,0, avail,buf,len_io);
+ if (*len_io > avail) { errno= ENOSPC; return 0; }
+
+ return buf;
+}
void adns_interest(adns_state ads, int *maxfd,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
} else {
checktimeouts(ads,now,tv_io,tvbuf);
}
-
- inter_addfd(maxfd,readfds,ads->udpsocket);
- switch (ads->tcpstate) {
- case server_disconnected:
- break;
- case server_connecting:
- inter_addfd(maxfd,writefds,ads->tcpsocket);
- break;
- case server_ok:
- inter_addfd(maxfd,readfds,ads->tcpsocket);
- inter_addfd(maxfd,exceptfds,ads->tcpsocket);
- if (ads->tcpsend.used) inter_addfd(maxfd,writefds,ads->tcpsocket);
- break;
- default:
- abort();
- }
+ checkfds(ads, maxfd,readfds,writefds,exceptfds, 0,0,0);
}
/* Callback procedures - these do the real work of reception and timeout, etc. */