Only use the pipe chunking protocol if we know the syslogger should

be catching stderr output, and we are not ourselves the
syslogger. Otherwise, go directly to stderr.
Bug noticed by Tom Lane.
Backpatch as far as 8.0.

3 files changed, 20 insertions, 13 deletions

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 09485ed5f93..9bf5acbd5bc 100644
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.475.2.7 2007/02/11 15:12:48 mha Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.475.2.8 2007/07/19 19:14:54 adunstan Exp $
  *
  * NOTES
  *
@@ -211,8 +211,8 @@ static pid_t StartupPID = 0,
 			BgWriterPID = 0,
 			AutoVacPID = 0,
 			PgArchPID = 0,
-			PgStatPID = 0;
-pid_t			SysLoggerPID = 0; /* Needs to be accessed from elog.c */
+        	PgStatPID = 0,
+    		SysLoggerPID = 0;
 
 /* Startup/shutdown state */
 #define			NoShutdown		0
@@ -225,6 +225,7 @@ static bool FatalError = false; /* T if recovering from backend crash */
 
 bool		ClientAuthInProgress = false;		/* T during new-client
 												 * authentication */
+bool redirection_done = false; 
 
 /*
  * State for assigning random salts and cancel keys.
@@ -336,6 +337,7 @@ typedef struct
 	InheritableSocket pgStatPipe1;
 	pid_t		PostmasterPid;
 	TimestampTz PgStartTime;
+	bool        redirection_done;
 #ifdef WIN32
 	HANDLE		PostmasterHandle;
 	HANDLE		initial_signal_pipe;
@@ -3704,6 +3706,8 @@ save_backend_variables(BackendParameters * param, Port *port,
 	param->PostmasterPid = PostmasterPid;
 	param->PgStartTime = PgStartTime;
 
+	param->redirection_done = redirection_done;
+
 #ifdef WIN32
 	param->PostmasterHandle = PostmasterHandle;
 	write_duplicated_handle(&param->initial_signal_pipe,
@@ -3909,6 +3913,8 @@ restore_backend_variables(BackendParameters * param, Port *port)
 	PostmasterPid = param->PostmasterPid;
 	PgStartTime = param->PgStartTime;
 
+	redirection_done = param->redirection_done;
+
 #ifdef WIN32
 	PostmasterHandle = param->PostmasterHandle;
 	pgwin32_initial_signal_pipe = param->initial_signal_pipe;
diff --git a/src/backend/postmaster/syslogger.c b/src/backend/postmaster/syslogger.c
index 6cb3a48baff..2fb82c252f9 100644
--- a/src/backend/postmaster/syslogger.c
+++ b/src/backend/postmaster/syslogger.c
@@ -18,7 +18,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.20.2.2 2007/06/14 01:50:14 adunstan Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.20.2.3 2007/07/19 19:14:54 adunstan Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -79,11 +79,12 @@ bool		Log_truncate_on_rotation = false;
  */
 bool		am_syslogger = false;
 
+extern bool redirection_done;
+
 /*
  * Private state
  */
 static pg_time_t next_rotation_time;
-static bool redirection_done = false;
 static bool pipe_eof_seen = false;
 static FILE *syslogFile = NULL;
 static char *last_file_name = NULL;
@@ -573,14 +574,12 @@ syslogger_forkexec(void)
 		snprintf(numbuf[bufc++], 32, "%d", fileno(syslogFile));
 	else
 		strcpy(numbuf[bufc++], "-1");
-	snprintf(numbuf[bufc++], 32, "%d", (int) redirection_done);
 #else							/* WIN32 */
 	if (syslogFile != NULL)
 		snprintf(numbuf[bufc++], 32, "%ld",
 				 _get_osfhandle(_fileno(syslogFile)));
 	else
 		strcpy(numbuf[bufc++], "0");
-	snprintf(numbuf[bufc++], 32, "%d", (int) redirection_done);
 #endif   /* WIN32 */
 
 	/* Add to the arg list */
@@ -614,7 +613,6 @@ syslogger_parseArgs(int argc, char *argv[])
 		syslogFile = fdopen(fd, "a");
 		setvbuf(syslogFile, NULL, LBF_MODE, 0);
 	}
-	redirection_done = (bool) atoi(*argv++);
 #else							/* WIN32 */
 	fd = atoi(*argv++);
 	if (fd != 0)
@@ -626,7 +624,6 @@ syslogger_parseArgs(int argc, char *argv[])
 			setvbuf(syslogFile, NULL, LBF_MODE, 0);
 		}
 	}
-	redirection_done = (bool) atoi(*argv++);
 #endif   /* WIN32 */
 }
 #endif   /* EXEC_BACKEND */
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index c91531ee27c..5e1a807fd40 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -42,7 +42,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/error/elog.c,v 1.167.2.3 2007/06/14 01:50:14 adunstan Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/error/elog.c,v 1.167.2.4 2007/07/19 19:14:54 adunstan Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -75,7 +75,7 @@ ErrorContextCallback *error_context_stack = NULL;
 
 sigjmp_buf *PG_exception_stack = NULL;
 
-extern pid_t SysLoggerPID;
+extern bool redirection_done;
 
 /* GUC parameters */
 PGErrorVerbosity Log_error_verbosity = PGERROR_VERBOSE;
@@ -1706,11 +1706,15 @@ send_message_to_server_log(ErrorData *edata)
 		 * that's really a pipe to the syslogger process. Unless we're in the
 		 * postmaster, and the syslogger process isn't started yet.
 		 */
-		if ((!Redirect_stderr || am_syslogger || (!IsUnderPostmaster && SysLoggerPID==0)) && pgwin32_is_service())
+		if (pgwin32_is_service() && (!redirection_done || am_syslogger) )
 			write_eventlog(edata->elevel, buf.data);
 		else
 #endif
-			if (Redirect_stderr)
+			/* only use the chunking protocol if we know the syslogger should
+			 * be catching stderr output, and we are not ourselves the
+			 * syslogger. Otherwise, go directly to stderr.
+			 */
+			if (redirection_done && !am_syslogger)
 				write_pipe_chunks(fileno(stderr), buf.data, buf.len);
 			else
 				write(fileno(stderr), buf.data, buf.len);