Don't intercept SIGQUIT as a signal to trigger failover; that's what

postmaster uses for immediate shutdown. Trap SIGUSR1 as the preferred
signal for that.

Per report by Fujii Masao and subsequent discussion on -hackers.

diff --git a/contrib/pg_standby/pg_standby.c b/contrib/pg_standby/pg_standby.c
index 66b4dc4502c9a147592297e25278e77e7af42fdf..8b95682c7533e57c5435b04535904ef0d54bdca3 100644 (file)
--- a/contrib/pg_standby/pg_standby.c
+++ b/contrib/pg_standby/pg_standby.c
@@ -451,14 +451,36 @@ sighandler(int sig)
    signaled = true;
 }
 
+/* We don't want SIGQUIT to core dump */
+static void
+sigquit_handler(int sig)
+{
+   signal(SIGINT, SIG_DFL);
+   kill(getpid(), SIGINT);
+}
+
+
 /*------------ MAIN ----------------------------------------*/
 int
 main(int argc, char **argv)
 {
    int         c;
 
-   (void) signal(SIGINT, sighandler);
-   (void) signal(SIGQUIT, sighandler);
+   /*
+    * You can send SIGUSR1 to trigger failover.
+    *
+    * Postmaster uses SIGQUIT to request immediate shutdown. The default
+    * action is to core dump, but we don't want that, so trap it and
+    * commit suicide without core dump.
+    *
+    * We used to use SIGINT and SIGQUIT to trigger failover, but that
+    * turned out to be a bad idea because postmaster uses SIGQUIT to
+    * request immediate shutdown. We still trap SIGINT, but that may
+    * change in a future release.
+    */
+   (void) signal(SIGUSR1, sighandler);
+   (void) signal(SIGINT, sighandler); /* deprecated, use SIGUSR1 */
+   (void) signal(SIGQUIT, sigquit_handler);
 
    while ((c = getopt(argc, argv, "cdk:lr:s:t:w:")) != -1)
    {