This patch covers several to-do items that I had for libpgtcl:

* It works under both Tcl 7.6 and Tcl 8.0 now.  (The code claims to
  work under Tcl 7.5 as well, but I have no way to test that ---
  if anyone still cares, please check it with 7.5.)

* pg_listen suppresses extra LISTEN commands and correctly sends an
  UNLISTEN when the last listen request for a relation is cancelled.
  (Note this means it will not work with pre-6.4 backends, but that
  was true already because it depends on the current libpq, which
  only speaks protocol 2.0.)

* Added -error option to pg_result so that there's some way to find
  out what you did wrong ;-)

* Miscellaneous cleanups of code comments and overenthusiastic #includes.

BTW, I bumped the package version number from 1.2 to 1.3.  Is this
premature?  Does someone run around and do that routinely before
each pgsql release?

			regards, tom lane

src/interfaces/libpgtcl/libpgtcl.h

 /*-------------------------------------------------------------------------
  *
  * libpgtcl.h--
- *	  libpgtcl is a tcl package for front-ends to interface with pglite
- *	 It's the tcl equivalent of the old libpq C interface.
+ *
+ *	libpgtcl is a tcl package for front-ends to interface with PostgreSQL.
+ *	It's a Tcl wrapper for libpq.
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: libpgtcl.h,v 1.5 1998/09/01 04:39:53 momjian Exp $
+ * $Id: libpgtcl.h,v 1.6 1998/09/21 01:01:58 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */

src/interfaces/libpgtcl/pgtcl.c

@@ -2,14 +2,14 @@
  *
  * pgtcl.c--
  *
- *	  libpgtcl is a tcl package for front-ends to interface with pglite
- *	 It's the tcl equivalent of the old libpq C interface.
+ *	libpgtcl is a tcl package for front-ends to interface with PostgreSQL.
+ *	It's a Tcl wrapper for libpq.
  *
  * Copyright (c) 1994, Regents of the University of California
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/interfaces/libpgtcl/Attic/pgtcl.c,v 1.12 1998/09/01 04:39:55 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/interfaces/libpgtcl/Attic/pgtcl.c,v 1.13 1998/09/21 01:02:00 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -17,14 +17,13 @@
 #include <stdlib.h>
 
 #include "postgres.h"
-#include "tcl.h"
 #include "libpgtcl.h"
 #include "pgtclCmds.h"
 #include "pgtclId.h"
 
 /*
  * Pgtcl_Init
- *	  initialization package for the PGLITE Tcl package
+ *	  initialization package for the PGTCL Tcl package
  *
  */
 
@@ -35,7 +34,7 @@ Pgtcl_Init(Tcl_Interp * interp)
 	/*
 	 * finish off the ChannelType struct.  Much easier to do it here then
 	 * to guess where it might be by position in the struct.  This is
-	 * needed for Tcl7.6 and beyond, which have the getfileproc.
+	 * needed for Tcl7.6 *only*, which has the getfileproc.
 	 */
 #if HAVE_TCL_GETFILEPROC
 	Pg_ConnType.getFileProc = PgGetFileProc;
@@ -127,7 +126,7 @@ Pgtcl_Init(Tcl_Interp * interp)
 					  Pg_listen,
 					  (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
 
-	Tcl_PkgProvide(interp, "Pgtcl", "1.2");
+	Tcl_PkgProvide(interp, "Pgtcl", "1.3");
 
 	return TCL_OK;
 }

src/interfaces/libpgtcl/pgtclCmds.h

@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: pgtclCmds.h,v 1.11 1998/09/01 04:39:57 momjian Exp $
+ * $Id: pgtclCmds.h,v 1.12 1998/09/21 01:02:02 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -54,9 +54,10 @@ typedef struct Pg_ConnectionId_s
 
 	Pg_TclNotifies *notify_list;/* head of list of notify info */
 	int			notifier_running;		/* notify event source is live */
-
+	int			notifier_socket; /* PQsocket on which notifier is listening */
 }			Pg_ConnectionId;
 
+/* Values of res_copyStatus */
 #define RES_COPY_NONE	0
 #define RES_COPY_INPROGRESS 1
 #define RES_COPY_FIN	2

src/interfaces/libpgtcl/pgtclId.h

 /*-------------------------------------------------------------------------
-*
-* pgtclId.h--
-*	 useful routines to convert between strings and pointers
-*  Needed because everything in tcl is a string, but often, pointers
-*  to data structures are needed.
-*
-*
-* Copyright (c) 1994, Regents of the University of California
-*
-* $Id: pgtclId.h,v 1.8 1998/09/01 04:39:59 momjian Exp $
-*
-*-------------------------------------------------------------------------
-*/
+ *
+ * pgtclId.h--
+ *
+ *	Contains Tcl "channel" interface routines, plus useful routines
+ *	to convert between strings and pointers.  These are needed because
+ *	everything in Tcl is a string, but in C, pointers to data structures
+ *	are needed.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: pgtclId.h,v 1.9 1998/09/21 01:02:04 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
 
 extern void PgSetConnectionId(Tcl_Interp * interp, PGconn *conn);
 
@@ -32,8 +33,8 @@ extern void PgSetConnectionId(Tcl_Interp * interp, PGconn *conn);
 #define DRIVER_DEL_PROTO ClientData cData, Tcl_Interp *interp
 #endif
 
-extern PGconn *PgGetConnectionId(Tcl_Interp * interp, char *id, \
-				  Pg_ConnectionId **);
+extern PGconn *PgGetConnectionId(Tcl_Interp * interp, char *id,
+								 Pg_ConnectionId **);
 extern		PgDelConnectionId(DRIVER_DEL_PROTO);
 extern int	PgOutputProc(DRIVER_OUTPUT_PROTO);
 extern		PgInputProc(DRIVER_INPUT_PROTO);
@@ -46,8 +47,8 @@ extern void PgStopNotifyEventSource(Pg_ConnectionId * connid);
 extern void PgNotifyTransferEvents(Pg_ConnectionId * connid);
 extern void PgNotifyInterpDelete(ClientData clientData, Tcl_Interp * interp);
 
-/* GetFileProc is needed in Tcl 7.6 and later */
-#if (TCL_MAJOR_VERSION * 100 + TCL_MINOR_VERSION) >= 706
+/* GetFileProc is needed in Tcl 7.6 *only* ... it went away again in 8.0 */
+#if TCL_MAJOR_VERSION == 7 && TCL_MINOR_VERSION >= 6
 #define HAVE_TCL_GETFILEPROC 1
 #else
 #define HAVE_TCL_GETFILEPROC 0
@@ -55,7 +56,6 @@ extern void PgNotifyInterpDelete(ClientData clientData, Tcl_Interp * interp);
 
 #if HAVE_TCL_GETFILEPROC
 extern Tcl_File PgGetFileProc(ClientData cData, int direction);
-
 #endif
 
 extern Tcl_ChannelType Pg_ConnType;