X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fevent.c;h=29d50a0cf6e8817476d4a300f400e1a99e85e1b0;hp=a1641c630a1d0307d62fffc6f6e6c61e39a3844d;hb=d00d4b99046ceb395e4ca22c97cd8aa0942f115a;hpb=2953d358511ac5d196362f6b339c010d4e9cae3e

diff --git a/src/event.c b/src/event.c
index a1641c6..29d50a0 100644
--- a/src/event.c
+++ b/src/event.c
@@ -6,10 +6,10 @@
  */
 /*
  *  This file is
- *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
  *
  *  It is part of adns, which is
- *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
  *    Copyright (C) 1999 Tony Finch <dot@dotat.at>
  *  
  *  This program is free software; you can redistribute it and/or modify
@@ -54,11 +54,18 @@ static void tcp_close(adns_state ads) {
 
 void adns__tcp_broken(adns_state ads, const char *what, const char *why) {
   int serv;
+  adns_query qu;
   
   assert(ads->tcpstate == server_connecting || ads->tcpstate == server_ok);
   serv= ads->tcpserver;
   if (what) adns__warn(ads,serv,0,"TCP connection failed: %s: %s",what,why);
 
+  if (ads->tcpstate == server_connecting) {
+    /* Counts as a retry for all the queries waiting for TCP. */
+    for (qu= ads->tcpw.head; qu; qu= qu->next)
+      qu->retries++;
+  }
+
   tcp_close(ads);
   ads->tcpstate= server_broken;
   ads->tcpserver= (serv+1)%ads->nservers;
@@ -143,6 +150,17 @@ void adns__must_gettimeofday(adns_state ads, const struct timeval **now_io,
   return;
 }
 
+static void inter_immed(struct timeval **tv_io, struct timeval *tvbuf) {
+  struct timeval *rbuf;
+
+  if (!tv_io) return;
+
+  rbuf= *tv_io;
+  if (!rbuf) { *tv_io= rbuf= tvbuf; }
+
+  timerclear(rbuf);
+}
+    
 static void inter_maxto(struct timeval **tv_io, struct timeval *tvbuf,
 			struct timeval maxto) {
   struct timeval *rbuf;
@@ -185,12 +203,7 @@ static void timeouts_queue(adns_state ads, int act,
     if (!timercmp(&now,&qu->timeout,>)) {
       inter_maxtoabs(tv_io,tvbuf,now,qu->timeout);
     } else {
-      if (!act) {
-	tvbuf->tv_sec= 0;
-	tvbuf->tv_usec= 0;
-	*tv_io= tvbuf;
-	return;
-      }
+      if (!act) { inter_immed(tv_io,tvbuf); return; }
       LIST_UNLINK(*queue,qu);
       if (qu->state != query_tosend) {
 	adns__query_fail(qu,adns_s_timeout);
@@ -210,6 +223,7 @@ static void tcp_events(adns_state ads, int act,
   for (;;) {
     switch (ads->tcpstate) {
     case server_broken:
+      if (!act) { inter_immed(tv_io,tvbuf); return; }
       for (qu= ads->tcpw.head; qu; qu= nqu) {
 	nqu= qu->next;
 	assert(qu->state == query_tcpw);
@@ -221,6 +235,7 @@ static void tcp_events(adns_state ads, int act,
       ads->tcpstate= server_disconnected;
     case server_disconnected: /* fall through */
       if (!ads->tcpw.head) return;
+      if (!act) { inter_immed(tv_io,tvbuf); return; }
       adns__tcp_tryconnect(ads,now);
       break;
     case server_ok:
@@ -231,7 +246,7 @@ static void tcp_events(adns_state ads, int act,
 	timevaladd(&ads->tcptimeout,TCPIDLEMS);
       }
     case server_connecting: /* fall through */
-      if (!timercmp(&now,&ads->tcptimeout,>)) {
+      if (!act || !timercmp(&now,&ads->tcptimeout,>)) {
 	inter_maxtoabs(tv_io,tvbuf,now,ads->tcptimeout);
 	return;
       } {
@@ -253,6 +268,7 @@ static void tcp_events(adns_state ads, int act,
       abort();
     }
   }
+  return;
 }
 
 void adns__timeouts(adns_state ads, int act,
@@ -295,6 +311,7 @@ int adns__pollfds(adns_state ads, struct pollfd pollfds_buf[MAX_POLLFDS]) {
 
   switch (ads->tcpstate) {
   case server_disconnected:
+  case server_broken:
     return 1;
   case server_connecting:
     pollfds_buf[1].events= POLLOUT;
@@ -318,12 +335,13 @@ int adns_processreadable(adns_state ads, int fd, const struct timeval *now) {
 
   switch (ads->tcpstate) {
   case server_disconnected:
+  case server_broken:
   case server_connecting:
     break;
   case server_ok:
     if (fd != ads->tcpsocket) break;
     assert(!ads->tcprecv_skip);
-    for (;;) {
+    do {
       if (ads->tcprecv.used >= ads->tcprecv_skip+2) {
 	dgramlen= ((ads->tcprecv.buf[ads->tcprecv_skip]<<8) |
 	           ads->tcprecv.buf[ads->tcprecv_skip+1]);
@@ -357,9 +375,9 @@ int adns_processreadable(adns_state ads, int fd, const struct timeval *now) {
 	  if (errno_resources(errno)) { r= errno; goto xit; }
 	}
 	adns__tcp_broken(ads,"read",r?strerror(errno):"closed");
-	r= 0; goto xit;
       }
-    } /* never reached */
+    } while (ads->tcpstate == server_ok);
+    r= 0; goto xit;
   default:
     abort();
   }
@@ -415,6 +433,7 @@ int adns_processwriteable(adns_state ads, int fd, const struct timeval *now) {
 
   switch (ads->tcpstate) {
   case server_disconnected:
+  case server_broken:
     break;
   case server_connecting:
     if (fd != ads->tcpsocket) break;
@@ -437,8 +456,8 @@ int adns_processwriteable(adns_state ads, int fd, const struct timeval *now) {
       r= 0; goto xit;
     } /* not reached */
   case server_ok:
-    if (!(ads->tcpsend.used && fd == ads->tcpsocket)) break;
-    for (;;) {
+    if (fd != ads->tcpsocket) break;
+    while (ads->tcpsend.used) {
       adns__sigpipe_protect(ads);
       r= write(ads->tcpsocket,ads->tcpsend.buf,ads->tcpsend.used);
       adns__sigpipe_unprotect(ads);
@@ -452,7 +471,9 @@ int adns_processwriteable(adns_state ads, int fd, const struct timeval *now) {
 	ads->tcpsend.used -= r;
 	memmove(ads->tcpsend.buf,ads->tcpsend.buf+r,ads->tcpsend.used);
       }
-    } /* not reached */
+    }
+    r= 0;
+    goto xit;
   default:
     abort();
   }
@@ -466,6 +487,7 @@ int adns_processexceptional(adns_state ads, int fd, const struct timeval *now) {
   adns__consistency(ads,0,cc_entex);
   switch (ads->tcpstate) {
   case server_disconnected:
+  case server_broken:
     break;
   case server_connecting:
   case server_ok:
@@ -531,8 +553,8 @@ void adns_beforeselect(adns_state ads, int *maxfd_io, fd_set *readfds_io,
   if (tv_mod && (!*tv_mod || (*tv_mod)->tv_sec || (*tv_mod)->tv_usec)) {
     /* The caller is planning to sleep. */
     adns__must_gettimeofday(ads,&now,&tv_nowbuf);
-    if (!now) goto xit;
-    adns__timeouts(ads, 1, tv_mod,tv_tobuf, *now);
+    if (!now) { inter_immed(tv_mod,tv_tobuf); goto xit; }
+    adns__timeouts(ads, 0, tv_mod,tv_tobuf, *now);
   }
 
   npollfds= adns__pollfds(ads,pollfds);
@@ -586,6 +608,7 @@ void adns_globalsystemfailure(adns_state ads) {
     adns__tcp_broken(ads,0,0);
     break;
   case server_disconnected:
+  case server_broken:
     break;
   default:
     abort();
@@ -609,7 +632,7 @@ int adns_processany(adns_state ads) {
    * likely just to want to do a read on one or two fds anyway.
    */
   npollfds= adns__pollfds(ads,pollfds);
-  for (i=0; i<npollfds; i++) pollfds[i].revents= pollfds[i].events;
+  for (i=0; i<npollfds; i++) pollfds[i].revents= pollfds[i].events & ~POLLPRI;
   adns__fdevents(ads,
 		 pollfds,npollfds,
 		 0,0,0,0,
@@ -665,6 +688,7 @@ int adns_wait(adns_state ads,
     maxfd= 0; tvp= 0;
     FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
     adns_beforeselect(ads,&maxfd,&readfds,&writefds,&exceptfds,&tvp,&tvbuf,0);
+    assert(tvp);
     rsel= select(maxfd,&readfds,&writefds,&exceptfds,tvp);
     if (rsel==-1) {
       if (errno == EINTR) {