Do not sleep for tiny periods, or hang trying to sleep for zero. Bug 1426

[exim.git] / src / src / exim.c

diff --git a/src/src/exim.c b/src/src/exim.c
index 09e9c1cba9159e2bc19ad791597c412e937801b6..51daa55760d4a2aa2a88139ad2bd6f3abf7d5b70 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -267,6 +267,10 @@ will wait for ever, so we panic in this instance. (There was a case of this
 when a bug in a function that calls milliwait() caused it to pass invalid data.
 That's when I added the check. :-)
 
+We assume it to be not worth sleeping for under 100us; this value will
+require revisiting as hardware advances.  This avoids the issue of
+a zero-valued timer setting meaning "never fire".
+
 Argument:  an itimerval structure containing the interval
 Returns:   nothing
 */
@@ -276,6 +280,9 @@ milliwait(struct itimerval *itval)
 {
 sigset_t sigmask;
 sigset_t old_sigmask;
+
+if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
+  return;
 (void)sigemptyset(&sigmask);                           /* Empty mask */
 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
@@ -399,9 +406,10 @@ if (exim_tvcmp(&now_tv, then_tv) <= 0)
     if (!running_in_test_harness)
       {
       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
-        then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
+        then_tv->tv_sec, (long) then_tv->tv_usec,
+               now_tv.tv_sec, (long) now_tv.tv_usec);
       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
-        itval.it_value.tv_usec);
+        (long) itval.it_value.tv_usec);
       }
     }
 
@@ -807,6 +815,9 @@ fprintf(f, "Support for:");
 #ifndef DISABLE_PRDR
   fprintf(f, " PRDR");
 #endif
+#ifndef DISABLE_OCSP
+  fprintf(f, " OCSP");
+#endif
 #ifdef EXPERIMENTAL_SPF
   fprintf(f, " Experimental_SPF");
 #endif
@@ -822,9 +833,6 @@ fprintf(f, "Support for:");
 #ifdef EXPERIMENTAL_DMARC
   fprintf(f, " Experimental_DMARC");
 #endif
-#ifdef EXPERIMENTAL_OCSP
-  fprintf(f, " Experimental_OCSP");
-#endif
 #ifdef EXPERIMENTAL_PROXY
   fprintf(f, " Experimental_Proxy");
 #endif