Support silent mode for service registrations on win32

Using -s when registering a service will now suppress
the application eventlog entries stating that the service
is starting and started.

MauMau

doc/src/sgml/ref/pg_ctl-ref.sgml

@@ -117,6 +117,7 @@ PostgreSQL documentation
    </arg>
    <arg>-w</arg>
    <arg>-t <replaceable>seconds</replaceable></arg>
+   <arg>-s</arg>
    <arg>-o <replaceable>options</replaceable></arg>
   </cmdsynopsis>
 

src/bin/pg_ctl/pg_ctl.c

@@ -163,6 +163,9 @@ write_eventlog(int level, const char *line)
 {
 	static HANDLE evtHandle = INVALID_HANDLE_VALUE;
 
+	if (silent_mode && level == EVENTLOG_INFORMATION_TYPE)
+		return;
+
 	if (evtHandle == INVALID_HANDLE_VALUE)
 	{
 		evtHandle = RegisterEventSource(NULL, "PostgreSQL");
@@ -1276,6 +1279,9 @@ pgwin32_CommandLine(bool registration)
 		/* concatenate */
 		sprintf(cmdLine + strlen(cmdLine), " -t %d", wait_seconds);
 
+	if (registration && silent_mode)
+		strcat(cmdLine, " -s");
+
 	if (post_opts)
 	{
 		strcat(cmdLine, " ");