Review uses of IsUnderPostmaster, change some tests to look at

whereToSendOutput instead because they are really inquiring about
the correct client communication protocol.  Update some comments.
This is pointing towards supporting regular FE/BE client protocol
in a standalone backend, per discussion a month or so back.

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.363 2004/01/27 00:45:26 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.364 2004/01/28 21:02:40 tgl Exp $
  *
  * NOTES
  *
@@ -2697,6 +2697,10 @@ SubPostmasterMain(int argc, char* argv[])
 	/* Do this sooner rather than later... */
 	IsUnderPostmaster = true;	/* we are a postmaster subprocess now */
 
+	/* In EXEC case we will not have inherited these settings */
+	IsPostmasterEnvironment = true;
+	whereToSendOutput = None;
+
 	/* Setup global context */
 	MemoryContextInit();
 	InitializeGUCOptions();
@@ -2994,6 +2998,14 @@ SSDataBaseInit(int xlop)
 	IsUnderPostmaster = true;		/* we are a postmaster subprocess
 									 * now */
 
+#ifdef EXEC_BACKEND
+	/* In EXEC case we will not have inherited these settings */
+	IsPostmasterEnvironment = true;
+	whereToSendOutput = None;
+#endif
+
+	MyProcPid = getpid();		/* reset MyProcPid */
+
 	/* Lose the postmaster's on-exit routines and port connections */
 	on_exit_reset();