Avoid wait-for-tick on single-message connections

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

diff --git a/src/src/exim.c b/src/src/exim.c
index eb1d83416151583f64e6ed6c01054e9ad5ce96e6..e15d5e4760d252557d471c5e4e53b645e1f45b19 100644 (file)
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -211,6 +211,19 @@ exit(1);
 }
 
 
+/***********************************************
+*            Handler for SIGSEGV               *
+***********************************************/
+
+static void
+segv_handler(int sig)
+{
+log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
+signal(SIGSEGV, SIG_DFL);
+kill(getpid(), sig);
+}
+
+
 /*************************************************
 *             Handler for SIGUSR1                *
 *************************************************/
@@ -431,9 +444,10 @@ function prepares for the time when things are faster - and it also copes with
 clocks that go backwards.
 
 Arguments:
-  tgt_tv       A timeval which was used to create uniqueness; its usec field
+  prev_tv      A timeval which was used to create uniqueness; its usec field
                  has been rounded down to the value of the resolution.
                  We want to be sure the current time is greater than this.
+                On return, updated to current (rounded down).
   resolution   The resolution that was used to divide the microseconds
                  (1 for maildir, larger for message ids)
 
@@ -441,7 +455,7 @@ Returns:       nothing
 */
 
 void
-exim_wait_tick(struct timeval * tgt_tv, int resolution)
+exim_wait_tick(struct timeval * prev_tv, int resolution)
 {
 struct timeval now_tv;
 long int now_true_usec;
@@ -450,13 +464,13 @@ exim_gettime(&now_tv);
 now_true_usec = now_tv.tv_usec;
 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 
-while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
+while (exim_tvcmp(&now_tv, prev_tv) <= 0)
   {
   struct itimerval itval;
   itval.it_interval.tv_sec = 0;
   itval.it_interval.tv_usec = 0;
-  itval.it_value.tv_sec = tgt_tv->tv_sec - now_tv.tv_sec;
-  itval.it_value.tv_usec = tgt_tv->tv_usec + resolution - now_true_usec;
+  itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
+  itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
 
   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
   negative value for the microseconds is possible only in the case when "now"
@@ -474,7 +488,7 @@ while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
     if (!f.running_in_test_harness)
       {
       debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
-        tgt_tv->tv_sec, (long) tgt_tv->tv_usec,
+        prev_tv->tv_sec, (long) prev_tv->tv_usec,
                now_tv.tv_sec, (long) now_tv.tv_usec);
       debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
         itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
@@ -490,6 +504,7 @@ while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
   now_true_usec = now_tv.tv_usec;
   now_tv.tv_usec = (now_true_usec/resolution) * resolution;
   }
+*prev_tv = now_tv;
 }
 
 
@@ -1631,7 +1646,6 @@ BOOL list_queue = FALSE;
 BOOL list_options = FALSE;
 BOOL list_config = FALSE;
 BOOL local_queue_only;
-BOOL more = TRUE;
 BOOL one_msg_action = FALSE;
 BOOL opt_D_used = FALSE;
 BOOL queue_only_set = FALSE;
@@ -1805,7 +1819,8 @@ descriptive text. */
 
 process_info = store_get(PROCESS_INFO_SIZE, TRUE);     /* tainted */
 set_process_info("initializing");
-os_restarting_signal(SIGUSR1, usr1_handler);
+os_restarting_signal(SIGUSR1, usr1_handler);           /* exiwhat */
+signal(SIGSEGV, segv_handler);                         /* log faults */
 
 /* If running in a dockerized environment, the TERM signal is only
 delegated to the PID 1 if we request it by setting an signal handler */
@@ -5464,15 +5479,15 @@ that SIG_IGN works. */
 
 if (!f.synchronous_delivery)
   {
-  #ifdef SA_NOCLDWAIT
+#ifdef SA_NOCLDWAIT
   struct sigaction act;
   act.sa_handler = SIG_IGN;
   sigemptyset(&(act.sa_mask));
   act.sa_flags = SA_NOCLDWAIT;
   sigaction(SIGCHLD, &act, NULL);
-  #else
+#else
   signal(SIGCHLD, SIG_IGN);
-  #endif
+#endif
   }
 
 /* Save the current store pool point, for resetting at the start of
@@ -5484,7 +5499,7 @@ real_sender_address = sender_address;
 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
 collapsed). */
 
-while (more)
+for (BOOL more = TRUE; more; )
   {
   rmark reset_point = store_mark();
   message_id[0] = 0;
@@ -5526,10 +5541,10 @@ while (more)
       /* Now get the data for the message */
 
       more = receive_msg(extract_recipients);
-      if (message_id[0] == 0)
+      if (!message_id[0])
         {
        cancel_cutthrough_connection(TRUE, US"receive dropped");
-        if (more) goto moreloop;
+        if (more) goto MORELOOP;
         smtp_log_no_mail();               /* Log no mail if configured */
         exim_exit(EXIT_FAILURE);
         }
@@ -5695,7 +5710,7 @@ while (more)
     for real; when reading the headers of a message for filter testing,
     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
 
-    if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
+    if (!message_id[0]) exim_exit(EXIT_FAILURE);
     }  /* Non-SMTP message reception */
 
   /* If this is a filter testing run, there are headers in store, but
@@ -5888,11 +5903,11 @@ while (more)
   finished subprocesses here, in case there are lots of messages coming in
   from the same source. */
 
-  #ifndef SIG_IGN_WORKS
+#ifndef SIG_IGN_WORKS
   while (waitpid(-1, NULL, WNOHANG) > 0);
-  #endif
+#endif
 
-moreloop:
+MORELOOP:
   return_path = sender_address = NULL;
   authenticated_sender = NULL;
   deliver_localpart_orig = NULL;