+ * Do not spin if connect() fails immediately (!)

[adns.git] / src / poll.c

diff --git a/src/poll.c b/src/poll.c
index 6183e4667503e84fabac9f26d08f762fc79606f0..35d08555c86c4223f36868ecb086453503d4e156 100644 (file)
--- a/src/poll.c
+++ b/src/poll.c
@@ -3,7 +3,12 @@
  * - wrappers for poll(2)
  */
 /*
- *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
+ *  This file is
+ *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ *  It is part of adns, which is
+ *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ *    Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
  *  
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -21,18 +26,19 @@
  */
 
 #include <limits.h>
+#include <string.h>
 
 #include "internal.h"
 
 #ifdef HAVE_POLL
 
-int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io,
-                   const struct timeval *now) {
+int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io,
+                   int *timeout_io, const struct timeval *now) {
   struct timeval tv_nowbuf, tv_tobuf, *tv_to;
   int space, found, timeout_ms, r;
   struct pollfd fds_tmp[MAX_POLLFDS];
 
-  adns__consistency(ads,cc_entex);
+  adns__consistency(ads,0,cc_entex);
 
   if (timeout_io) {
     adns__must_gettimeofday(ads,&now,&tv_nowbuf);
@@ -72,7 +78,7 @@ int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeo
   }
   r= 0;
 xit:
-  adns__consistency(ads,cc_entex);
+  adns__consistency(ads,0,cc_entex);
   return r;
 }
 
@@ -80,13 +86,46 @@ void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
                    const struct timeval *now) {
   struct timeval tv_buf;
 
-  adns__consistency(ads,cc_entex);
+  adns__consistency(ads,0,cc_entex);
   adns__must_gettimeofday(ads,&now,&tv_buf);
   if (now) {
     adns__timeouts(ads, 1, 0,0, *now);
     adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0);
   }
-  adns__consistency(ads,cc_entex);
+  adns__consistency(ads,0,cc_entex);
+}
+
+int adns_wait_poll(adns_state ads,
+                  adns_query *query_io,
+                  adns_answer **answer_r,
+                  void **context_r) {
+  int r, nfds, to;
+  struct pollfd fds[MAX_POLLFDS];
+  
+  adns__consistency(ads,0,cc_entex);
+
+  for (;;) {
+    r= adns__internal_check(ads,query_io,answer_r,context_r);
+    if (r != EAGAIN) goto xit;
+    nfds= MAX_POLLFDS; to= -1;
+    adns_beforepoll(ads,fds,&nfds,&to,0);
+    r= poll(fds,nfds,to);
+    if (r == -1) {
+      if (errno == EINTR) {
+       if (ads->iflags & adns_if_eintr) { r= EINTR; goto xit; }
+      } else {
+       adns__diag(ads,-1,0,"poll failed in wait: %s",strerror(errno));
+       adns_globalsystemfailure(ads);
+      }
+    } else {
+      assert(r >= 0);
+      adns_afterpoll(ads,fds,nfds,0);
+    }
+  }
+
+ xit:
+  adns__consistency(ads,0,cc_entex);
+  return r;
 }
 
 #endif