Handle reading of startup packet and authentication exchange after forking

a new postmaster child process.  This should eliminate problems with
authentication blocking (e.g., ident, SSL init) and also reduce problems
with the accept queue filling up under heavy load.

The option to send elog output to a different file per backend (postgres -o)
has been disabled for now because the initialization would have to happen
in a different order and it's not clear we want to keep this anyway.

src/backend/tcop/postgres.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.222 2001/06/19 23:40:10 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.223 2001/06/20 18:07:55 petere Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -45,6 +45,7 @@
 #include "libpq/pqformat.h"
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
+#include "libpq/auth.h"
 #include "nodes/print.h"
 #include "optimizer/cost.h"
 #include "optimizer/planner.h"
@@ -1142,11 +1143,13 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[], const cha
 	 */
 	if (!IsUnderPostmaster)
 	{
+		SetProcessingMode(InitProcessing);
 		EnableExceptionHandling(true);
 		MemoryContextInit();
 	}
 
-	SetProcessingMode(InitProcessing);
+	if (IsUnderPostmaster)
+		ClientAuthentication(MyProcPort); /* might not return */
 
 	/*
 	 * Set default values for command-line options.
@@ -1567,13 +1570,11 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[], const cha
 								 * restart... */
 		}
 		pq_init();				/* initialize libpq at backend startup */
-		whereToSendOutput = Remote;
 		BaseInit();
 	}
 	else
 	{
 		/* interactive case: database name can be last arg on command line */
-		whereToSendOutput = Debug;
 		if (errs || argc - optind > 1)
 		{
 			fprintf(stderr, "%s: invalid command line arguments\nTry -? for help.\n", argv[0]);
@@ -1709,7 +1710,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[], const cha
 	if (!IsUnderPostmaster)
 	{
 		puts("\nPOSTGRES backend interactive interface ");
-		puts("$Revision: 1.222 $ $Date: 2001/06/19 23:40:10 $\n");
+		puts("$Revision: 1.223 $ $Date: 2001/06/20 18:07:55 $\n");
 	}
 
 	/*

src/backend/utils/error/elog.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/error/elog.c,v 1.86 2001/06/08 21:16:48 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/error/elog.c,v 1.87 2001/06/20 18:07:56 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -129,10 +129,6 @@ elog(int lev, const char *fmt,...)
 	/* size of the prefix needed for timestamp and pid, if enabled */
 	size_t		timestamp_size;
 
-	/* ignore debug msgs if noplace to send */
-	if (lev == DEBUG && Debugfile < 0)
-		return;
-
 	/* Save error str before calling any function that might change errno */
 	errorstr = useful_strerror(errno);
 
@@ -336,10 +332,9 @@ elog(int lev, const char *fmt,...)
 	/* syslog doesn't want a trailing newline, but other destinations do */
 	strcat(msg_buf, "\n");
 
-	/* Write to debug file, if open and enabled */
-	/* NOTE: debug file is typically pointed at stderr */
-	if (Debugfile >= 0 && Use_syslog <= 1)
-		write(Debugfile, msg_buf, strlen(msg_buf));
+	/* write to terminal */
+	if (Use_syslog <= 1 || whereToSendOutput == Debug)
+		write(2, msg_buf, strlen(msg_buf));
 
 	if (lev > DEBUG && whereToSendOutput == Remote)
 	{
@@ -371,17 +366,6 @@ elog(int lev, const char *fmt,...)
 		MemoryContextSwitchTo(oldcxt);
 	}
 
-	if (lev > DEBUG && whereToSendOutput != Remote)
-	{
-		/*
-		 * We are running as an interactive backend, so just send the
-		 * message to stderr.  But don't send a duplicate if Debugfile
-		 * write, above, already sent to stderr.
-		 */
-		if (Debugfile != fileno(stderr))
-			fputs(msg_buf, stderr);
-	}
-
 	/* done with the message, release space */
 	if (fmt_buf != fmt_fixedbuf)
 		free(fmt_buf);

src/backend/utils/init/miscinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.71 2001/06/14 01:09:22 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.72 2001/06/20 18:07:56 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -28,6 +28,7 @@
 
 #include "catalog/catname.h"
 #include "catalog/pg_shadow.h"
+#include "libpq/libpq-be.h"
 #include "miscadmin.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
@@ -279,6 +280,7 @@ SetCharSet()
 	int			i;
 	unsigned char FromChar,
 				ToChar;
+	char		ChTable[80];
 
 	for (i = 0; i < 128; i++)
 	{
@@ -286,11 +288,17 @@ SetCharSet()
 		RecodeBackTable[i] = i + 128;
 	}
 
+	if (IsUnderPostmaster)
+	{
+		GetCharSetByHost(ChTable, MyProcPort->raddr.in.sin_addr.s_addr, DataDir);
+		p = ChTable;
+	}
+	else
 		p = getenv("PG_RECODETABLE");
+
 	if (p && *p != '\0')
 	{
-		map_file = (char *) malloc((strlen(DataDir) +
-									strlen(p) + 2) * sizeof(char));
+		map_file = malloc(strlen(DataDir) +	strlen(p) + 2);
 		if (! map_file)
 			elog(FATAL, "out of memory");
 		sprintf(map_file, "%s/%s", DataDir, p);

src/include/libpq/auth.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: auth.h,v 1.16 2001/03/22 04:00:47 momjian Exp $
+ * $Id: auth.h,v 1.17 2001/06/20 18:07:56 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -21,7 +21,7 @@
  *----------------------------------------------------------------
  */
 
-void		be_recvauth(Port *port);
+void		ClientAuthentication(Port *port);
 
 #define PG_KRB4_VERSION "PGVER4.1"		/* at most KRB_SENDAUTH_VLEN chars */
 #define PG_KRB5_VERSION "PGVER5.1"