This commit was manufactured by cvs2git to create branch 'ecpg_big_bison'.

Sprout from master 2002-06-20 20:29:54 UTC Bruce Momjian <bruce@momjian.us> 'Update copyright to 2002.'
Delete:
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1 files changed, 0 insertions, 2715 deletions

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
deleted file mode 100644
index b578305b4c5..00000000000
--- a/src/backend/postmaster/pgstat.c
+++ /dev/null
@@ -1,2715 +0,0 @@
-/* ----------
- * pgstat.c
- *
- *	All the statistics collector stuff hacked up in one big, ugly file.
- *
- *	TODO:	- Separate collector, postmaster and backend stuff
- *			  into different files.
- *
- *			- Add some automatic call for pgstat vacuuming.
- *
- *			- Add a pgstat config column to pg_database, so this
- *			  entire thing can be enabled/disabled on a per db base.
- *			  Not to be done before 7.2 - requires catalog change and
- *			  thus an initdb and we might want to provide this as a
- *			  patch for 7.1.
- *
- *	Copyright (c) 2001, PostgreSQL Global Development Group
- *
- *	$Header: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v 1.21 2002/05/20 23:51:43 tgl Exp $
- * ----------
- */
-#include "postgres.h"
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <errno.h>
-#include <signal.h>
-
-#include "access/xact.h"
-#include "access/heapam.h"
-#include "catalog/catname.h"
-#include "catalog/pg_shadow.h"
-#include "catalog/pg_database.h"
-#include "libpq/pqsignal.h"
-#ifdef MULTIBYTE
-#include "mb/pg_wchar.h"
-#endif
-#include "miscadmin.h"
-#include "utils/memutils.h"
-#include "storage/backendid.h"
-#include "storage/ipc.h"
-#include "utils/rel.h"
-#include "utils/hsearch.h"
-#include "utils/ps_status.h"
-#include "utils/syscache.h"
-
-#include "pgstat.h"
-
-
-/* ----------
- * GUC parameters
- * ----------
- */
-bool		pgstat_collect_startcollector = true;
-bool		pgstat_collect_resetonpmstart = true;
-bool		pgstat_collect_querystring = false;
-bool		pgstat_collect_tuplelevel = false;
-bool		pgstat_collect_blocklevel = false;
-
-/* ----------
- * Local data
- * ----------
- */
-static int	pgStatSock = -1;
-static int	pgStatPipe[2];
-static struct sockaddr_in pgStatAddr;
-static int	pgStatPmPipe[2] = {-1, -1};
-
-static int	pgStatRunning = 0;
-static int	pgStatPid;
-
-static long pgStatNumMessages = 0;
-
-static bool pgStatRunningInCollector = FALSE;
-static int	pgStatTabstatAlloc = 0;
-static int	pgStatTabstatUsed = 0;
-static PgStat_MsgTabstat **pgStatTabstatMessages = NULL;
-static int	pgStatXactCommit = 0;
-static int	pgStatXactRollback = 0;
-
-
-static TransactionId pgStatDBHashXact = InvalidTransactionId;
-static HTAB *pgStatDBHash = NULL;
-static HTAB *pgStatBeDead = NULL;
-static PgStat_StatBeEntry *pgStatBeTable = NULL;
-static int	pgStatNumBackends = 0;
-
-static char pgStat_tmpfname[MAXPGPATH];
-static char pgStat_fname[MAXPGPATH];
-
-
-/* ----------
- * Local function forward declarations
- * ----------
- */
-static void pgstat_main(void);
-static void pgstat_recvbuffer(void);
-static void pgstat_die(SIGNAL_ARGS);
-
-static int	pgstat_add_backend(PgStat_MsgHdr *msg);
-static void pgstat_sub_backend(int procpid);
-static void pgstat_drop_database(Oid databaseid);
-static void pgstat_write_statsfile(void);
-static void pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
-					  PgStat_StatBeEntry **betab,
-					  int *numbackends);
-
-static void pgstat_setheader(PgStat_MsgHdr *hdr, int mtype);
-static void pgstat_send(void *msg, int len);
-
-static void pgstat_recv_bestart(PgStat_MsgBestart *msg, int len);
-static void pgstat_recv_beterm(PgStat_MsgBeterm *msg, int len);
-static void pgstat_recv_activity(PgStat_MsgActivity *msg, int len);
-static void pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len);
-static void pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len);
-static void pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len);
-static void pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len);
-
-
-/* ------------------------------------------------------------
- * Public functions called from postmaster follow
- * ------------------------------------------------------------
- */
-
-
-/* ----------
- * pgstat_init() -
- *
- *	Called from postmaster at startup. Create the resources required
- *	by the statistics collector process.
- *
- *	NOTE: failure exit from this routine causes the postmaster to abort.
- *	This is unfriendly and should not be done except in dire straits.
- *	Better to let the postmaster start with stats collection disabled.
- * ----------
- */
-int
-pgstat_init(void)
-{
-	int			alen;
-
-	/*
-	 * Force start of collector daemon if something to collect
-	 */
-	if (pgstat_collect_querystring || pgstat_collect_tuplelevel ||
-		pgstat_collect_blocklevel)
-		pgstat_collect_startcollector = true;
-
-	/*
-	 * Initialize the filenames for the status reports.
-	 */
-	snprintf(pgStat_tmpfname, MAXPGPATH,
-			 PGSTAT_STAT_TMPFILE, DataDir, getpid());
-	snprintf(pgStat_fname, MAXPGPATH,
-			 PGSTAT_STAT_FILENAME, DataDir);
-
-	/*
-	 * If we don't have to start a collector or should reset the collected
-	 * statistics on postmaster start, simply remove the file.
-	 */
-	if (!pgstat_collect_startcollector || pgstat_collect_resetonpmstart)
-		unlink(pgStat_fname);
-
-	/*
-	 * Nothing else required if collector will not get started
-	 */
-	if (!pgstat_collect_startcollector)
-		return 0;
-
-	/*
-	 * Create the UDP socket for sending and receiving statistic messages
-	 */
-	if ((pgStatSock = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
-	{
-		elog(LOG, "PGSTAT: socket() failed: %m");
-		goto startup_failed;
-	}
-
-	/*
-	 * Bind it to a kernel assigned port on localhost and get the assigned
-	 * port via getsockname().
-	 */
-	pgStatAddr.sin_family = AF_INET;
-	pgStatAddr.sin_port = htons(0);
-	inet_aton("127.0.0.1", &(pgStatAddr.sin_addr));
-	alen = sizeof(pgStatAddr);
-	if (bind(pgStatSock, (struct sockaddr *) & pgStatAddr, alen) < 0)
-	{
-		elog(LOG, "PGSTAT: bind(127.0.0.1) failed: %m");
-		goto startup_failed;
-	}
-	if (getsockname(pgStatSock, (struct sockaddr *) & pgStatAddr, &alen) < 0)
-	{
-		elog(LOG, "PGSTAT: getsockname() failed: %m");
-		goto startup_failed;
-	}
-
-	/*
-	 * Connect the socket to its own address.  This saves a few cycles by
-	 * not having to respecify the target address on every send. This also
-	 * provides a kernel-level check that only packets from this same
-	 * address will be received.
-	 */
-	if (connect(pgStatSock, (struct sockaddr *) & pgStatAddr, alen) < 0)
-	{
-		elog(LOG, "PGSTAT: connect() failed: %m");
-		goto startup_failed;
-	}
-
-	/*
-	 * Set the socket to non-blocking IO.  This ensures that if the
-	 * collector falls behind (despite the buffering process), statistics
-	 * messages will be discarded; backends won't block waiting to send
-	 * messages to the collector.
-	 */
-	if (fcntl(pgStatSock, F_SETFL, O_NONBLOCK) < 0)
-	{
-		elog(LOG, "PGSTAT: fcntl() failed: %m");
-		goto startup_failed;
-	}
-
-	/*
-	 * Create the pipe that controls the statistics collector shutdown
-	 */
-	if (pipe(pgStatPmPipe) < 0)
-	{
-		elog(LOG, "PGSTAT: pipe() failed: %m");
-		goto startup_failed;
-	}
-
-	return 0;
-
-startup_failed:
-	if (pgStatSock >= 0)
-		close(pgStatSock);
-	pgStatSock = -1;
-
-	/* Adjust GUC variables to suppress useless activity */
-	pgstat_collect_querystring = false;
-	pgstat_collect_tuplelevel = false;
-	pgstat_collect_blocklevel = false;
-
-	return 0;
-}
-
-
-/* ----------
- * pgstat_start() -
- *
- *	Called from postmaster at startup or after an existing collector
- *	died.  Fire up a fresh statistics collector.
- *
- *	NOTE: failure exit from this routine causes the postmaster to abort.
- * ----------
- */
-int
-pgstat_start(void)
-{
-	/*
-	 * Do nothing if no collector needed
-	 */
-	if (!pgstat_collect_startcollector)
-		return 0;
-
-	/*
-	 * Check that the socket is there, else pgstat_init failed
-	 */
-	if (pgStatSock < 0)
-	{
-		elog(LOG, "PGSTAT: statistics collector startup skipped");
-		return 0;
-	}
-
-	/*
-	 * Then fork off the collector.  Remember its PID for pgstat_ispgstat.
-	 */
-
-	fflush(stdout);
-	fflush(stderr);
-
-#ifdef __BEOS__
-	/* Specific beos actions before backend startup */
-	beos_before_backend_startup();
-#endif
-
-	switch ((pgStatPid = (int) fork()))
-	{
-		case -1:
-#ifdef __BEOS__
-			/* Specific beos actions */
-			beos_backend_startup_failed();
-#endif
-			elog(LOG, "PGSTAT: fork() failed: %m");
-			pgStatRunning = 0;
-			return 0;
-
-		case 0:
-			break;
-
-		default:
-			pgStatRunning = 1;
-			return 0;
-	}
-
-	/* in postmaster child ... */
-
-#ifdef __BEOS__
-	/* Specific beos actions after backend startup */
-	beos_backend_startup();
-#endif
-
-	IsUnderPostmaster = true;	/* we are a postmaster subprocess now */
-
-	/* Lose the postmaster's on-exit routines */
-	on_exit_reset();
-
-	/* Close the postmaster's sockets, except for pgstat link */
-	ClosePostmasterPorts(false);
-
-	pgstat_main();
-
-	exit(0);
-}
-
-
-/* ----------
- * pgstat_ispgstat() -
- *
- *	Called from postmaster to check if a terminated child process
- *	was the statistics collector.
- * ----------
- */
-int
-pgstat_ispgstat(int pid)
-{
-	if (pgStatRunning == 0)
-		return 0;
-
-	if (pgStatPid != pid)
-		return 0;
-
-	return 1;
-}
-
-
-/* ----------
- * pgstat_close_sockets() -
- *
- *	Called when postmaster forks a non-pgstat child process, to close off
- *	file descriptors that should not be held open in child processes.
- * ----------
- */
-void
-pgstat_close_sockets(void)
-{
-	if (pgStatPmPipe[0] >= 0)
-		close(pgStatPmPipe[0]);
-	pgStatPmPipe[0] = -1;
-	if (pgStatPmPipe[1] >= 0)
-		close(pgStatPmPipe[1]);
-	pgStatPmPipe[1] = -1;
-}
-
-
-/* ----------
- * pgstat_beterm() -
- *
- *	Called from postmaster to tell collector a backend terminated.
- * ----------
- */
-void
-pgstat_beterm(int pid)
-{
-	PgStat_MsgBeterm msg;
-
-	if (pgStatSock < 0)
-		return;
-
-	msg.m_hdr.m_type = PGSTAT_MTYPE_BETERM;
-	msg.m_hdr.m_backendid = 0;
-	msg.m_hdr.m_procpid = pid;
-	msg.m_hdr.m_databaseid = 0;
-
-	pgstat_send(&msg, sizeof(msg));
-}
-
-
-/* ------------------------------------------------------------
- * Public functions used by backends follow
- *------------------------------------------------------------
- */
-
-
-/* ----------
- * pgstat_bestart() -
- *
- *	Tell the collector that this new backend is soon ready to process
- *	queries. Called from tcop/postgres.c before entering the mainloop.
- * ----------
- */
-void
-pgstat_bestart(void)
-{
-	PgStat_MsgBestart msg;
-
-	if (pgStatSock < 0)
-		return;
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_BESTART);
-	pgstat_send(&msg, sizeof(msg));
-}
-
-
-/* ----------
- * pgstat_report_activity() -
- *
- *	Called in tcop/postgres.c to tell the collector what the backend
- *	is actually doing (usually "<IDLE>" or the start of the query to
- *	be executed).
- * ----------
- */
-void
-pgstat_report_activity(char *what)
-{
-	PgStat_MsgActivity msg;
-	int			len;
-
-	if (!pgstat_collect_querystring || pgStatSock < 0)
-		return;
-
-	len = strlen(what);
-#ifdef MULTIBYTE
-	len = pg_mbcliplen((const unsigned char *)what, len, PGSTAT_ACTIVITY_SIZE - 1);
-#else
-	if (len >= PGSTAT_ACTIVITY_SIZE)
-		len = PGSTAT_ACTIVITY_SIZE - 1;
-#endif
-
-	memcpy(msg.m_what, what, len);
-	msg.m_what[len] = '\0';
-	len += offsetof(PgStat_MsgActivity, m_what) +1;
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_ACTIVITY);
-	pgstat_send(&msg, len);
-}
-
-
-/* ----------
- * pgstat_report_tabstat() -
- *
- *	Called from tcop/postgres.c to send the so far collected
- *	per table access statistics to the collector.
- * ----------
- */
-void
-pgstat_report_tabstat(void)
-{
-	int			i;
-	int			n;
-	int			len;
-
-	if (!pgstat_collect_querystring && !pgstat_collect_tuplelevel &&
-		!pgstat_collect_blocklevel)
-		return;
-
-	if (pgStatSock < 0)
-		return;
-
-	/*
-	 * For each message buffer used during the last query set the header
-	 * fields and send it out.
-	 */
-	for (i = 0; i < pgStatTabstatUsed; i++)
-	{
-		n = pgStatTabstatMessages[i]->m_nentries;
-		len = offsetof(PgStat_MsgTabstat, m_entry[0]) +
-			n * sizeof(PgStat_TableEntry);
-
-		pgStatTabstatMessages[i]->m_xact_commit = pgStatXactCommit;
-		pgStatTabstatMessages[i]->m_xact_rollback = pgStatXactRollback;
-		pgStatXactCommit = 0;
-		pgStatXactRollback = 0;
-
-		pgstat_setheader(&pgStatTabstatMessages[i]->m_hdr,
-						 PGSTAT_MTYPE_TABSTAT);
-		pgstat_send(pgStatTabstatMessages[i], len);
-	}
-
-	pgStatTabstatUsed = 0;
-}
-
-
-/* ----------
- * pgstat_vacuum_tabstat() -
- *
- *	Will tell the collector about objects he can get rid of.
- * ----------
- */
-int
-pgstat_vacuum_tabstat(void)
-{
-	Relation	dbrel;
-	HeapScanDesc dbscan;
-	HeapTuple	dbtup;
-	Oid		   *dbidlist;
-	int			dbidalloc;
-	int			dbidused;
-	HASH_SEQ_STATUS hstat;
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatTabEntry *tabentry;
-	HeapTuple	reltup;
-	int			nobjects = 0;
-	PgStat_MsgTabpurge msg;
-	int			len;
-	int			i;
-
-	if (pgStatSock < 0)
-		return 0;
-
-	/*
-	 * We don't vacuum inside of transaction blocks, because a possible
-	 * later rollback might reactivate objects we didn't find because of
-	 * earlier destruction in the xact.
-	 */
-	if (IsTransactionBlock())
-		return 0;
-
-	/*
-	 * If not done for this transaction, read the statistics collector
-	 * stats file into some hash tables.
-	 */
-	if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
-	{
-		pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
-							  &pgStatBeTable, &pgStatNumBackends);
-		pgStatDBHashXact = GetCurrentTransactionId();
-	}
-
-	/*
-	 * Lookup our own database entry
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-												 (void *) &MyDatabaseId,
-												 HASH_FIND, NULL);
-	if (dbentry == NULL)
-		return -1;
-
-	if (dbentry->tables == NULL)
-		return 0;
-
-	/*
-	 * Initialize our messages table counter to zero
-	 */
-	msg.m_nentries = 0;
-
-	/*
-	 * Check for all tables if they still exist.
-	 */
-	hash_seq_init(&hstat, dbentry->tables);
-	while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&hstat)) != NULL)
-	{
-		/*
-		 * Check if this relation is still alive by looking up it's
-		 * pg_class tuple in the system catalog cache.
-		 */
-		reltup = SearchSysCache(RELOID,
-								ObjectIdGetDatum(tabentry->tableid),
-								0, 0, 0);
-		if (HeapTupleIsValid(reltup))
-		{
-			ReleaseSysCache(reltup);
-			continue;
-		}
-
-		/*
-		 * Add this tables Oid to the message
-		 */
-		msg.m_tableid[msg.m_nentries++] = tabentry->tableid;
-		nobjects++;
-
-		/*
-		 * If the message is full, send it out and reinitialize ot zero
-		 */
-		if (msg.m_nentries >= PGSTAT_NUM_TABPURGE)
-		{
-			len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
-				+ msg.m_nentries * sizeof(Oid);
-
-			pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
-			pgstat_send(&msg, len);
-
-			msg.m_nentries = 0;
-		}
-	}
-
-	/*
-	 * Send the rest
-	 */
-	if (msg.m_nentries > 0)
-	{
-		len = offsetof(PgStat_MsgTabpurge, m_tableid[0])
-			+ msg.m_nentries * sizeof(Oid);
-
-		pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_TABPURGE);
-		pgstat_send(&msg, len);
-	}
-
-	/*
-	 * Read pg_database and remember the Oid's of all existing databases
-	 */
-	dbidalloc = 256;
-	dbidused = 0;
-	dbidlist = (Oid *) palloc(sizeof(Oid) * dbidalloc);
-
-	dbrel = heap_openr(DatabaseRelationName, AccessShareLock);
-	dbscan = heap_beginscan(dbrel, SnapshotNow, 0, NULL);
-	while ((dbtup = heap_getnext(dbscan, ForwardScanDirection)) != NULL)
-	{
-		if (dbidused >= dbidalloc)
-		{
-			dbidalloc *= 2;
-			dbidlist = (Oid *) repalloc((char *) dbidlist,
-										sizeof(Oid) * dbidalloc);
-		}
-		dbidlist[dbidused++] = dbtup->t_data->t_oid;
-	}
-	heap_endscan(dbscan);
-	heap_close(dbrel, AccessShareLock);
-
-	/*
-	 * Search the database hash table for dead databases and tell the
-	 * collector to drop them as well.
-	 */
-	hash_seq_init(&hstat, pgStatDBHash);
-	while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
-	{
-		Oid			dbid = dbentry->databaseid;
-
-		for (i = 0; i < dbidused; i++)
-		{
-			if (dbidlist[i] == dbid)
-			{
-				dbid = InvalidOid;
-				break;
-			}
-		}
-
-		if (dbid != InvalidOid)
-		{
-			nobjects++;
-			pgstat_drop_database(dbid);
-		}
-	}
-
-	/*
-	 * Free the dbid list.
-	 */
-	pfree((char *) dbidlist);
-
-	/*
-	 * Tell the caller how many removeable objects we found
-	 */
-	return nobjects;
-}
-
-
-/* ----------
- * pgstat_drop_database() -
- *
- *	Tell the collector that we just dropped a database.
- *	This is the only message that shouldn't get lost in space. Otherwise
- *	the collector will keep the statistics for the dead DB until his
- *	stats file got removed while the postmaster is down.
- * ----------
- */
-static void
-pgstat_drop_database(Oid databaseid)
-{
-	PgStat_MsgDropdb msg;
-
-	if (pgStatSock < 0)
-		return;
-
-	msg.m_databaseid = databaseid;
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DROPDB);
-	pgstat_send(&msg, sizeof(msg));
-}
-
-
-/* ----------
- * pgstat_reset_counters() -
- *
- *	Tell the statistics collector to reset counters for our database.
- * ----------
- */
-void
-pgstat_reset_counters(void)
-{
-	PgStat_MsgResetcounter msg;
-
-	if (pgStatSock < 0)
-		return;
-
-	if (!superuser())
-		elog(ERROR, "Only database superusers can reset statistic counters");
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_RESETCOUNTER);
-	pgstat_send(&msg, sizeof(msg));
-}
-
-
-/* ----------
- * pgstat_ping() -
- *
- *	Send some junk data to the collector to increase traffic.
- * ----------
- */
-void
-pgstat_ping(void)
-{
-	PgStat_MsgDummy msg;
-
-	if (pgStatSock < 0)
-		return;
-
-	pgstat_setheader(&msg.m_hdr, PGSTAT_MTYPE_DUMMY);
-	pgstat_send(&msg, sizeof(msg));
-}
-
-
-/* ----------
- * pgstat_initstats() -
- *
- *	Called from various places usually dealing with initialization
- *	of Relation or Scan structures. The data placed into these
- *	structures from here tell where later to count for buffer reads,
- *	scans and tuples fetched.
- * ----------
- */
-void
-pgstat_initstats(PgStat_Info *stats, Relation rel)
-{
-	PgStat_TableEntry *useent = NULL;
-	Oid			rel_id = rel->rd_id;
-	int			mb;
-	int			i;
-
-	/*
-	 * Initialize data not to count at all.
-	 */
-	stats->tabentry = NULL;
-	stats->no_stats = FALSE;
-	stats->heap_scan_counted = FALSE;
-	stats->index_scan_counted = FALSE;
-
-	if (pgStatSock < 0)
-	{
-		stats->no_stats = TRUE;
-		return;
-	}
-
-	/*
-	 * On the first of all calls initialize the message buffers.
-	 */
-	if (pgStatTabstatAlloc == 0)
-	{
-		pgStatTabstatAlloc = 4;
-		pgStatTabstatMessages = (PgStat_MsgTabstat **)
-			malloc(sizeof(PgStat_MsgTabstat *) * pgStatTabstatAlloc);
-		if (pgStatTabstatMessages == NULL)
-		{
-			elog(LOG, "PGSTATBE: malloc() failed");
-			return;
-		}
-		for (i = 0; i < pgStatTabstatAlloc; i++)
-		{
-			pgStatTabstatMessages[i] = (PgStat_MsgTabstat *)
-				malloc(sizeof(PgStat_MsgTabstat));
-			if (pgStatTabstatMessages[i] == NULL)
-			{
-				elog(LOG, "PGSTATBE: malloc() failed");
-				return;
-			}
-		}
-	}
-
-	/*
-	 * Lookup the so far used table slots for this relation.
-	 */
-	for (mb = 0; mb < pgStatTabstatUsed; mb++)
-	{
-		for (i = 0; i < pgStatTabstatMessages[mb]->m_nentries; i++)
-		{
-			if (pgStatTabstatMessages[mb]->m_entry[i].t_id == rel_id)
-			{
-				stats->tabentry = (void *) &(pgStatTabstatMessages[mb]->m_entry[i]);
-				return;
-			}
-		}
-
-		if (pgStatTabstatMessages[mb]->m_nentries >= PGSTAT_NUM_TABENTRIES)
-			continue;
-
-		/*
-		 * Not found, but found a message buffer with an empty slot
-		 * instead. Fine, let's use this one.
-		 */
-		i = pgStatTabstatMessages[mb]->m_nentries++;
-		useent = &pgStatTabstatMessages[mb]->m_entry[i];
-		memset(useent, 0, sizeof(PgStat_TableEntry));
-		useent->t_id = rel_id;
-		stats->tabentry = (void *) useent;
-		return;
-	}
-
-	/*
-	 * If we ran out of message buffers, we just allocate more.
-	 */
-	if (pgStatTabstatUsed >= pgStatTabstatAlloc)
-	{
-		pgStatTabstatAlloc += 4;
-		pgStatTabstatMessages = (PgStat_MsgTabstat **)
-			realloc(pgStatTabstatMessages,
-					sizeof(PgStat_MsgTabstat *) * pgStatTabstatAlloc);
-		if (pgStatTabstatMessages == NULL)
-		{
-			pgStatTabstatAlloc -= 4;
-			elog(LOG, "PGSTATBE: malloc() failed");
-			return;
-		}
-		for (i = pgStatTabstatUsed; i < pgStatTabstatAlloc; i++)
-		{
-			pgStatTabstatMessages[i] = (PgStat_MsgTabstat *)
-				malloc(sizeof(PgStat_MsgTabstat));
-			if (pgStatTabstatMessages[i] == NULL)
-			{
-				pgStatTabstatAlloc -= 4;
-				elog(LOG, "PGSTATBE: malloc() failed");
-				return;
-			}
-		}
-	}
-
-	/*
-	 * Use the first entry of the next message buffer.
-	 */
-	mb = pgStatTabstatUsed++;
-	pgStatTabstatMessages[mb]->m_nentries = 1;
-	useent = &pgStatTabstatMessages[mb]->m_entry[0];
-	memset(useent, 0, sizeof(PgStat_TableEntry));
-	useent->t_id = rel_id;
-	stats->tabentry = (void *) useent;
-	return;
-}
-
-
-/* ----------
- * pgstat_count_xact_commit() -
- *
- *	Called from access/transam/xact.c to count transaction commits.
- * ----------
- */
-void
-pgstat_count_xact_commit(void)
-{
-	if (!pgstat_collect_querystring && !pgstat_collect_tuplelevel &&
-		!pgstat_collect_blocklevel)
-		return;
-
-	pgStatXactCommit++;
-
-	/*
-	 * If there was no relation activity yet, just make one existing
-	 * message buffer used without slots, causing the next report to tell
-	 * new xact-counters.
-	 */
-	if (pgStatTabstatAlloc > 0)
-	{
-		if (pgStatTabstatUsed == 0)
-		{
-			pgStatTabstatUsed++;
-			pgStatTabstatMessages[0]->m_nentries = 0;
-		}
-	}
-}
-
-
-/* ----------
- * pgstat_count_xact_rollback() -
- *
- *	Called from access/transam/xact.c to count transaction rollbacks.
- * ----------
- */
-void
-pgstat_count_xact_rollback(void)
-{
-	if (!pgstat_collect_querystring && !pgstat_collect_tuplelevel &&
-		!pgstat_collect_blocklevel)
-		return;
-
-	pgStatXactRollback++;
-
-	/*
-	 * If there was no relation activity yet, just make one existing
-	 * message buffer used without slots, causing the next report to tell
-	 * new xact-counters.
-	 */
-	if (pgStatTabstatAlloc > 0)
-	{
-		if (pgStatTabstatUsed == 0)
-		{
-			pgStatTabstatUsed++;
-			pgStatTabstatMessages[0]->m_nentries = 0;
-		}
-	}
-}
-
-
-/* ----------
- * pgstat_fetch_stat_dbentry() -
- *
- *	Support function for the SQL-callable pgstat* functions. Returns
- *	the collected statistics for one database or NULL. NULL doesn't mean
- *	that the database doesn't exist, it is just not yet known by the
- *	collector, so the caller is better off to report ZERO instead.
- * ----------
- */
-PgStat_StatDBEntry *
-pgstat_fetch_stat_dbentry(Oid dbid)
-{
-	PgStat_StatDBEntry *dbentry;
-
-	/*
-	 * If not done for this transaction, read the statistics collector
-	 * stats file into some hash tables. Be careful with the
-	 * read_statsfile() call below!
-	 */
-	if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
-	{
-		pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
-							  &pgStatBeTable, &pgStatNumBackends);
-		pgStatDBHashXact = GetCurrentTransactionId();
-	}
-
-	/*
-	 * Lookup the requested database
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-												 (void *) &dbid,
-												 HASH_FIND, NULL);
-	if (dbentry == NULL)
-		return NULL;
-
-	return dbentry;
-}
-
-
-/* ----------
- * pgstat_fetch_stat_tabentry() -
- *
- *	Support function for the SQL-callable pgstat* functions. Returns
- *	the collected statistics for one table or NULL. NULL doesn't mean
- *	that the table doesn't exist, it is just not yet known by the
- *	collector, so the caller is better off to report ZERO instead.
- * ----------
- */
-PgStat_StatTabEntry *
-pgstat_fetch_stat_tabentry(Oid relid)
-{
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatTabEntry *tabentry;
-
-	/*
-	 * If not done for this transaction, read the statistics collector
-	 * stats file into some hash tables. Be careful with the
-	 * read_statsfile() call below!
-	 */
-	if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
-	{
-		pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
-							  &pgStatBeTable, &pgStatNumBackends);
-		pgStatDBHashXact = GetCurrentTransactionId();
-	}
-
-	/*
-	 * Lookup our database.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-												 (void *) &MyDatabaseId,
-												 HASH_FIND, NULL);
-	if (dbentry == NULL)
-		return NULL;
-
-	/*
-	 * Now inside the DB's table hash table lookup the requested one.
-	 */
-	if (dbentry->tables == NULL)
-		return NULL;
-	tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
-												   (void *) &relid,
-												   HASH_FIND, NULL);
-	if (tabentry == NULL)
-		return NULL;
-
-	return tabentry;
-}
-
-
-/* ----------
- * pgstat_fetch_stat_beentry() -
- *
- *	Support function for the SQL-callable pgstat* functions. Returns
- *	the actual activity slot of one active backend. The caller is
- *	responsible for a check if the actual user is permitted to see
- *	that info (especially the querystring).
- * ----------
- */
-PgStat_StatBeEntry *
-pgstat_fetch_stat_beentry(int beid)
-{
-	if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
-	{
-		pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
-							  &pgStatBeTable, &pgStatNumBackends);
-		pgStatDBHashXact = GetCurrentTransactionId();
-	}
-
-	if (beid < 1 || beid > pgStatNumBackends)
-		return NULL;
-
-	return &pgStatBeTable[beid - 1];
-}
-
-
-/* ----------
- * pgstat_fetch_stat_numbackends() -
- *
- *	Support function for the SQL-callable pgstat* functions. Returns
- *	the maximum current backend id.
- * ----------
- */
-int
-pgstat_fetch_stat_numbackends(void)
-{
-	if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
-	{
-		pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
-							  &pgStatBeTable, &pgStatNumBackends);
-		pgStatDBHashXact = GetCurrentTransactionId();
-	}
-
-	return pgStatNumBackends;
-}
-
-
-
-/* ------------------------------------------------------------
- * Local support functions follow
- * ------------------------------------------------------------
- */
-
-
-/* ----------
- * pgstat_setheader() -
- *
- *		Set common header fields in a statistics message
- * ----------
- */
-static void
-pgstat_setheader(PgStat_MsgHdr *hdr, int mtype)
-{
-	hdr->m_type = mtype;
-	hdr->m_backendid = MyBackendId;
-	hdr->m_procpid = MyProcPid;
-	hdr->m_databaseid = MyDatabaseId;
-	hdr->m_userid = GetSessionUserId();
-}
-
-
-/* ----------
- * pgstat_send() -
- *
- *		Send out one statistics message to the collector
- * ----------
- */
-static void
-pgstat_send(void *msg, int len)
-{
-	if (pgStatSock < 0)
-		return;
-
-	((PgStat_MsgHdr *) msg)->m_size = len;
-
-	send(pgStatSock, msg, len, 0);
-	/* We deliberately ignore any error from send() */
-}
-
-
-/* ------------------------------------------------------------
- * Local functions implementing the statistics collector itself follow
- *------------------------------------------------------------
- */
-
-
-/* ----------
- * pgstat_main() -
- *
- *	Start up the statistics collector itself.  This is the body of the
- *	postmaster child process.
- * ----------
- */
-static void
-pgstat_main(void)
-{
-	PgStat_Msg	msg;
-	fd_set		rfds;
-	int			readPipe;
-	int			pmPipe = pgStatPmPipe[0];
-	int			maxfd;
-	int			nready;
-	int			len = 0;
-	struct timeval timeout;
-	struct timeval next_statwrite;
-	bool		need_statwrite;
-	HASHCTL		hash_ctl;
-
-	/*
-	 * Close the writing end of the postmaster pipe, so we'll see it
-	 * closing when the postmaster terminates and can terminate as well.
-	 */
-	close(pgStatPmPipe[1]);
-	pgStatPmPipe[1] = -1;
-
-	/*
-	 * Ignore all signals usually bound to some action in the postmaster,
-	 * except for SIGCHLD --- see pgstat_recvbuffer.
-	 */
-	pqsignal(SIGHUP, SIG_IGN);
-	pqsignal(SIGINT, SIG_IGN);
-	pqsignal(SIGTERM, SIG_IGN);
-	pqsignal(SIGQUIT, SIG_IGN);
-	pqsignal(SIGALRM, SIG_IGN);
-	pqsignal(SIGPIPE, SIG_IGN);
-	pqsignal(SIGUSR1, SIG_IGN);
-	pqsignal(SIGUSR2, SIG_IGN);
-	pqsignal(SIGCHLD, pgstat_die);
-	pqsignal(SIGTTIN, SIG_DFL);
-	pqsignal(SIGTTOU, SIG_DFL);
-	pqsignal(SIGCONT, SIG_DFL);
-	pqsignal(SIGWINCH, SIG_DFL);
-
-	/*
-	 * Start a buffering process to read from the socket, so we have a
-	 * little more time to process incoming messages.
-	 *
-	 * NOTE: the process structure is: postmaster is parent of buffer process
-	 * is parent of collector process.	This way, the buffer can detect
-	 * collector failure via SIGCHLD, whereas otherwise it wouldn't notice
-	 * collector failure until it tried to write on the pipe.  That would
-	 * mean that after the postmaster started a new collector, we'd have
-	 * two buffer processes competing to read from the UDP socket --- not
-	 * good.
-	 */
-	if (pipe(pgStatPipe) < 0)
-	{
-		elog(LOG, "PGSTAT: pipe() failed: %m");
-		exit(1);
-	}
-
-	switch (fork())
-	{
-		case -1:
-			elog(LOG, "PGSTAT: fork() failed: %m");
-			exit(1);
-
-		case 0:
-			/* child becomes collector process */
-			close(pgStatPipe[1]);
-			close(pgStatSock);
-			break;
-
-		default:
-			/* parent becomes buffer process */
-			close(pgStatPipe[0]);
-			pgstat_recvbuffer();
-			exit(0);
-	}
-
-	/*
-	 * In the child we can have default SIGCHLD handling (in case we want
-	 * to call system() here...)
-	 */
-	pqsignal(SIGCHLD, SIG_DFL);
-
-	/*
-	 * Identify myself via ps
-	 */
-	init_ps_display("stats collector process", "", "");
-	set_ps_display("");
-
-	/*
-	 * Arrange to write the initial status file right away
-	 */
-	gettimeofday(&next_statwrite, NULL);
-	need_statwrite = TRUE;
-
-	/*
-	 * Read in an existing statistics stats file or initialize the stats
-	 * to zero.
-	 */
-	pgStatRunningInCollector = TRUE;
-	pgstat_read_statsfile(&pgStatDBHash, InvalidOid, NULL, NULL);
-
-	/*
-	 * Create the dead backend hashtable
-	 */
-	memset(&hash_ctl, 0, sizeof(hash_ctl));
-	hash_ctl.keysize = sizeof(int);
-	hash_ctl.entrysize = sizeof(PgStat_StatBeDead);
-	hash_ctl.hash = tag_hash;
-	pgStatBeDead = hash_create("Dead Backends", PGSTAT_BE_HASH_SIZE,
-							   &hash_ctl, HASH_ELEM | HASH_FUNCTION);
-	if (pgStatBeDead == NULL)
-	{
-		elog(LOG, "PGSTAT: Creation of dead backend hash table failed");
-		exit(1);
-	}
-
-	/*
-	 * Create the known backends table
-	 */
-	pgStatBeTable = (PgStat_StatBeEntry *) malloc(
-							   sizeof(PgStat_StatBeEntry) * MaxBackends);
-	if (pgStatBeTable == NULL)
-	{
-		elog(LOG, "PGSTAT: Allocation of backend table failed");
-		exit(1);
-	}
-	memset(pgStatBeTable, 0, sizeof(PgStat_StatBeEntry) * MaxBackends);
-
-	readPipe = pgStatPipe[0];
-
-	/*
-	 * Process incoming messages and handle all the reporting stuff until
-	 * there are no more messages.
-	 */
-	for (;;)
-	{
-		/*
-		 * If we need to write the status file again (there have been
-		 * changes in the statistics since we wrote it last) calculate the
-		 * timeout until we have to do so.
-		 */
-		if (need_statwrite)
-		{
-			gettimeofday(&timeout, NULL);
-			timeout.tv_usec = next_statwrite.tv_usec - timeout.tv_usec;
-			timeout.tv_sec = next_statwrite.tv_sec - timeout.tv_sec;
-			if (timeout.tv_usec < 0)
-			{
-				timeout.tv_sec -= 1;
-				timeout.tv_usec += 1000000;
-			}
-			if (timeout.tv_sec < 0)
-			{
-				timeout.tv_sec = 0;
-				timeout.tv_usec = 0;
-			}
-		}
-
-		/*
-		 * Setup the descriptor set for select(2)
-		 */
-		FD_ZERO(&rfds);
-		FD_SET(readPipe, &rfds);
-		FD_SET(pmPipe, &rfds);
-
-		if (readPipe > pmPipe)
-			maxfd = readPipe;
-		else
-			maxfd = pmPipe;
-
-		/*
-		 * Now wait for something to do.
-		 */
-		nready = select(maxfd + 1, &rfds, NULL, NULL,
-						(need_statwrite) ? &timeout : NULL);
-		if (nready < 0)
-		{
-			if (errno == EINTR)
-				continue;
-			elog(LOG, "PGSTAT: select() failed: %m");
-			exit(1);
-		}
-
-		/*
-		 * If there are no descriptors ready, our timeout for writing the
-		 * stats file happened.
-		 */
-		if (nready == 0)
-		{
-			pgstat_write_statsfile();
-			need_statwrite = FALSE;
-
-			continue;
-		}
-
-		/*
-		 * Check if there is a new statistics message to collect.
-		 */
-		if (FD_ISSET(readPipe, &rfds))
-		{
-			/*
-			 * We may need to issue multiple read calls in case the buffer
-			 * process didn't write the message in a single write, which
-			 * is possible since it dumps its buffer bytewise. In any
-			 * case, we'd need two reads since we don't know the message
-			 * length initially.
-			 */
-			int			nread = 0;
-			int			targetlen = sizeof(PgStat_MsgHdr);		/* initial */
-
-			while (nread < targetlen)
-			{
-				len = read(readPipe,
-						   ((char *) &msg) + nread,
-						   targetlen - nread);
-				if (len < 0)
-				{
-					if (errno == EINTR)
-						continue;
-					elog(LOG, "PGSTAT: read() failed: %m");
-					exit(1);
-				}
-				if (len == 0)	/* EOF on the pipe! */
-					break;
-				nread += len;
-				if (nread == sizeof(PgStat_MsgHdr))
-				{
-					/* we have the header, compute actual msg length */
-					targetlen = msg.msg_hdr.m_size;
-					if (targetlen < (int) sizeof(PgStat_MsgHdr) ||
-						targetlen > (int) sizeof(msg))
-					{
-						/*
-						 * Bogus message length implies that we got out of
-						 * sync with the buffer process somehow. Abort so
-						 * that we can restart both processes.
-						 */
-						elog(LOG, "PGSTAT: bogus message length");
-						exit(1);
-					}
-				}
-			}
-
-			/*
-			 * EOF on the pipe implies that the buffer process exited.
-			 * Fall out of outer loop.
-			 */
-			if (len == 0)
-				break;
-
-			/*
-			 * Distribute the message to the specific function handling
-			 * it.
-			 */
-			switch (msg.msg_hdr.m_type)
-			{
-				case PGSTAT_MTYPE_DUMMY:
-					break;
-
-				case PGSTAT_MTYPE_BESTART:
-					pgstat_recv_bestart((PgStat_MsgBestart *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_BETERM:
-					pgstat_recv_beterm((PgStat_MsgBeterm *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_TABSTAT:
-					pgstat_recv_tabstat((PgStat_MsgTabstat *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_TABPURGE:
-					pgstat_recv_tabpurge((PgStat_MsgTabpurge *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_ACTIVITY:
-					pgstat_recv_activity((PgStat_MsgActivity *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_DROPDB:
-					pgstat_recv_dropdb((PgStat_MsgDropdb *) &msg, nread);
-					break;
-
-				case PGSTAT_MTYPE_RESETCOUNTER:
-					pgstat_recv_resetcounter((PgStat_MsgResetcounter *) &msg,
-											 nread);
-					break;
-
-				default:
-					break;
-			}
-
-			/*
-			 * Globally count messages.
-			 */
-			pgStatNumMessages++;
-
-			/*
-			 * If this is the first message after we wrote the stats file
-			 * the last time, setup the timeout that it'd be written.
-			 */
-			if (!need_statwrite)
-			{
-				gettimeofday(&next_statwrite, NULL);
-				next_statwrite.tv_usec += ((PGSTAT_STAT_INTERVAL) * 1000);
-				next_statwrite.tv_sec += (next_statwrite.tv_usec / 1000000);
-				next_statwrite.tv_usec %= 1000000;
-				need_statwrite = TRUE;
-			}
-		}
-
-		/*
-		 * Note that we do NOT check for postmaster exit inside the loop;
-		 * only EOF on the buffer pipe causes us to fall out.  This
-		 * ensures we don't exit prematurely if there are still a few
-		 * messages in the buffer or pipe at postmaster shutdown.
-		 */
-	}
-
-	/*
-	 * Okay, we saw EOF on the buffer pipe, so there are no more messages
-	 * to process.	If the buffer process quit because of postmaster
-	 * shutdown, we want to save the final stats to reuse at next startup.
-	 * But if the buffer process failed, it seems best not to (there may
-	 * even now be a new collector firing up, and we don't want it to read
-	 * a partially- rewritten stats file).	We can tell whether the
-	 * postmaster is still alive by checking to see if the postmaster pipe
-	 * is still open.  If it is read-ready (ie, EOF), the postmaster must
-	 * have quit.
-	 */
-	if (FD_ISSET(pmPipe, &rfds))
-		pgstat_write_statsfile();
-}
-
-
-/* ----------
- * pgstat_recvbuffer() -
- *
- *	This is the body of the separate buffering process. Its only
- *	purpose is to receive messages from the UDP socket as fast as
- *	possible and forward them over a pipe into the collector itself.
- *	If the collector is slow to absorb messages, they are buffered here.
- * ----------
- */
-static void
-pgstat_recvbuffer(void)
-{
-	fd_set		rfds;
-	fd_set		wfds;
-	int			writePipe = pgStatPipe[1];
-	int			pmPipe = pgStatPmPipe[0];
-	int			maxfd;
-	int			nready;
-	int			len;
-	int			xfr;
-	int			frm;
-	PgStat_Msg	input_buffer;
-	char	   *msgbuffer;
-	int			msg_send = 0;	/* next send index in buffer */
-	int			msg_recv = 0;	/* next receive index */
-	int			msg_have = 0;	/* number of bytes stored */
-	struct sockaddr_in fromaddr;
-	int			fromlen;
-	bool		overflow = false;
-
-	/*
-	 * Identify myself via ps
-	 */
-	init_ps_display("stats buffer process", "", "");
-	set_ps_display("");
-
-	/*
-	 * We want to die if our child collector process does.	There are two
-	 * ways we might notice that it has died: receive SIGCHLD, or get a
-	 * write failure on the pipe leading to the child.	We can set SIGPIPE
-	 * to kill us here.  Our SIGCHLD handler was already set up before we
-	 * forked (must do it that way, else it's a race condition).
-	 */
-	pqsignal(SIGPIPE, SIG_DFL);
-	PG_SETMASK(&UnBlockSig);
-
-	/*
-	 * Set the write pipe to nonblock mode, so that we cannot block when
-	 * the collector falls behind.
-	 */
-	if (fcntl(writePipe, F_SETFL, O_NONBLOCK) < 0)
-	{
-		elog(LOG, "PGSTATBUFF: fcntl() failed: %m");
-		exit(1);
-	}
-
-	/*
-	 * Allocate the message buffer
-	 */
-	msgbuffer = (char *) malloc(PGSTAT_RECVBUFFERSZ);
-	if (msgbuffer == NULL)
-	{
-		elog(LOG, "PGSTATBUFF: malloc() failed");
-		exit(1);
-	}
-
-	/*
-	 * Loop forever
-	 */
-	for (;;)
-	{
-		FD_ZERO(&rfds);
-		FD_ZERO(&wfds);
-		maxfd = -1;
-
-		/*
-		 * As long as we have buffer space we add the socket to the read
-		 * descriptor set.
-		 */
-		if (msg_have <= (int) (PGSTAT_RECVBUFFERSZ - sizeof(PgStat_Msg)))
-		{
-			FD_SET(pgStatSock, &rfds);
-			maxfd = pgStatSock;
-			overflow = false;
-		}
-		else
-		{
-			if (!overflow)
-			{
-				elog(LOG, "PGSTATBUFF: Warning - receive buffer full");
-				overflow = true;
-			}
-		}
-
-		/*
-		 * If we have messages to write out, we add the pipe to the write
-		 * descriptor set. Otherwise, we check if the postmaster might
-		 * have terminated.
-		 */
-		if (msg_have > 0)
-		{
-			FD_SET(writePipe, &wfds);
-			if (writePipe > maxfd)
-				maxfd = writePipe;
-		}
-		else
-		{
-			FD_SET(pmPipe, &rfds);
-			if (pmPipe > maxfd)
-				maxfd = pmPipe;
-		}
-
-		/*
-		 * Wait for some work to do.
-		 */
-		nready = select(maxfd + 1, &rfds, &wfds, NULL, NULL);
-		if (nready < 0)
-		{
-			if (errno == EINTR)
-				continue;
-			elog(LOG, "PGSTATBUFF: select() failed: %m");
-			exit(1);
-		}
-
-		/*
-		 * If there is a message on the socket, read it and check for
-		 * validity.
-		 */
-		if (FD_ISSET(pgStatSock, &rfds))
-		{
-			fromlen = sizeof(fromaddr);
-			len = recvfrom(pgStatSock,
-						   &input_buffer, sizeof(PgStat_Msg), 0,
-						   (struct sockaddr *) &fromaddr, &fromlen);
-			if (len < 0)
-			{
-				elog(LOG, "PGSTATBUFF: recvfrom() failed: %m");
-				exit(1);
-			}
-
-			/*
-			 * We ignore messages that are smaller than our common header
-			 */
-			if (len < sizeof(PgStat_MsgHdr))
-				continue;
-
-			/*
-			 * The received length must match the length in the header
-			 */
-			if (input_buffer.msg_hdr.m_size != len)
-				continue;
-
-			/*
-			 * The source address of the packet must be our own socket.
-			 * This ensures that only real hackers or our own backends
-			 * tell us something.  (This should be redundant with a
-			 * kernel-level check due to having used connect(), but let's
-			 * do it anyway.)
-			 */
-			if (fromaddr.sin_addr.s_addr != pgStatAddr.sin_addr.s_addr)
-				continue;
-			if (fromaddr.sin_port != pgStatAddr.sin_port)
-				continue;
-
-			/*
-			 * O.K. - we accept this message.  Copy it to the circular
-			 * msgbuffer.
-			 */
-			frm = 0;
-			while (len > 0)
-			{
-				xfr = PGSTAT_RECVBUFFERSZ - msg_recv;
-				if (xfr > len)
-					xfr = len;
-				Assert(xfr > 0);
-				memcpy(msgbuffer + msg_recv,
-					   ((char *) &input_buffer) + frm,
-					   xfr);
-				msg_recv += xfr;
-				if (msg_recv == PGSTAT_RECVBUFFERSZ)
-					msg_recv = 0;
-				msg_have += xfr;
-				frm += xfr;
-				len -= xfr;
-			}
-		}
-
-		/*
-		 * If the collector is ready to receive, write some data into his
-		 * pipe.  We may or may not be able to write all that we have.
-		 *
-		 * NOTE: if what we have is less than PIPE_BUF bytes but more than
-		 * the space available in the pipe buffer, most kernels will
-		 * refuse to write any of it, and will return EAGAIN.  This means
-		 * we will busy-loop until the situation changes (either because
-		 * the collector caught up, or because more data arrives so that
-		 * we have more than PIPE_BUF bytes buffered).	This is not good,
-		 * but is there any way around it?	We have no way to tell when
-		 * the collector has caught up...
-		 */
-		if (FD_ISSET(writePipe, &wfds))
-		{
-			xfr = PGSTAT_RECVBUFFERSZ - msg_send;
-			if (xfr > msg_have)
-				xfr = msg_have;
-			Assert(xfr > 0);
-			len = write(writePipe, msgbuffer + msg_send, xfr);
-			if (len < 0)
-			{
-				if (errno == EINTR || errno == EAGAIN)
-					continue;	/* not enough space in pipe */
-				elog(LOG, "PGSTATBUFF: write() failed: %m");
-				exit(1);
-			}
-			/* NB: len < xfr is okay */
-			msg_send += len;
-			if (msg_send == PGSTAT_RECVBUFFERSZ)
-				msg_send = 0;
-			msg_have -= len;
-		}
-
-		/*
-		 * Make sure we forwarded all messages before we check for
-		 * Postmaster termination.
-		 */
-		if (msg_have != 0 || FD_ISSET(pgStatSock, &rfds))
-			continue;
-
-		/*
-		 * If the pipe from the postmaster is ready for reading, the
-		 * kernel must have closed it on exit() (the postmaster never
-		 * really writes to it). So we've done our job.
-		 */
-		if (FD_ISSET(pmPipe, &rfds))
-			exit(0);
-	}
-}
-
-static void
-pgstat_die(SIGNAL_ARGS)
-{
-	exit(1);
-}
-
-
-/* ----------
- * pgstat_add_backend() -
- *
- *	Support function to keep our backend list up to date.
- * ----------
- */
-static int
-pgstat_add_backend(PgStat_MsgHdr *msg)
-{
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatBeEntry *beentry;
-	PgStat_StatBeDead *deadbe;
-	bool		found;
-
-	/*
-	 * Check that the backend ID is valid
-	 */
-	if (msg->m_backendid < 1 || msg->m_backendid > MaxBackends)
-	{
-		elog(LOG, "PGSTAT: Invalid backend ID %d", msg->m_backendid);
-		return -1;
-	}
-
-	/*
-	 * Get the slot for this backendid.
-	 */
-	beentry = &pgStatBeTable[msg->m_backendid - 1];
-	if (beentry->databaseid != InvalidOid)
-	{
-		/*
-		 * If the slot contains the PID of this backend, everything is
-		 * fine and we got nothing to do.
-		 */
-		if (beentry->procpid == msg->m_procpid)
-			return 0;
-	}
-
-	/*
-	 * Lookup if this backend is known to be dead. This can be caused due
-	 * to messages arriving in the wrong order - i.e. Postmaster's BETERM
-	 * message might have arrived before we received all the backends
-	 * stats messages, or even a new backend with the same backendid was
-	 * faster in sending his BESTART.
-	 *
-	 * If the backend is known to be dead, we ignore this add.
-	 */
-	deadbe = (PgStat_StatBeDead *) hash_search(pgStatBeDead,
-											   (void *) &(msg->m_procpid),
-											   HASH_FIND, NULL);
-	if (deadbe)
-		return 1;
-
-	/*
-	 * Backend isn't known to be dead. If it's slot is currently used, we
-	 * have to kick out the old backend.
-	 */
-	if (beentry->databaseid != InvalidOid)
-		pgstat_sub_backend(beentry->procpid);
-
-	/*
-	 * Put this new backend into the slot.
-	 */
-	beentry->databaseid = msg->m_databaseid;
-	beentry->procpid = msg->m_procpid;
-	beentry->userid = msg->m_userid;
-	MemSet(beentry->activity, 0, PGSTAT_ACTIVITY_SIZE);
-
-	/*
-	 * Lookup or create the database entry for this backends DB.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-										   (void *) &(msg->m_databaseid),
-												 HASH_ENTER, &found);
-	if (dbentry == NULL)
-	{
-		elog(LOG, "PGSTAT: DB hash table out of memory - abort");
-		exit(1);
-	}
-
-	/*
-	 * If not found, initialize the new one.
-	 */
-	if (!found)
-	{
-		HASHCTL		hash_ctl;
-
-		dbentry->tables = NULL;
-		dbentry->n_xact_commit = 0;
-		dbentry->n_xact_rollback = 0;
-		dbentry->n_blocks_fetched = 0;
-		dbentry->n_blocks_hit = 0;
-		dbentry->n_connects = 0;
-		dbentry->destroy = 0;
-
-		memset(&hash_ctl, 0, sizeof(hash_ctl));
-		hash_ctl.keysize = sizeof(Oid);
-		hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
-		hash_ctl.hash = tag_hash;
-		dbentry->tables = hash_create("Per-database table",
-									  PGSTAT_TAB_HASH_SIZE,
-									  &hash_ctl,
-									  HASH_ELEM | HASH_FUNCTION);
-		if (dbentry->tables == NULL)
-		{
-			elog(LOG, "PGSTAT: failed to initialize hash table for "
-					"new database entry");
-			exit(1);
-		}
-	}
-
-	/*
-	 * Count number of connects to the database
-	 */
-	dbentry->n_connects++;
-
-	return 0;
-}
-
-
-/* ----------
- * pgstat_sub_backend() -
- *
- *	Remove a backend from the actual backends list.
- * ----------
- */
-static void
-pgstat_sub_backend(int procpid)
-{
-	int			i;
-	PgStat_StatBeDead *deadbe;
-	bool		found;
-
-	/*
-	 * Search in the known-backends table for the slot containing this
-	 * PID.
-	 */
-	for (i = 0; i < MaxBackends; i++)
-	{
-		if (pgStatBeTable[i].databaseid != InvalidOid &&
-			pgStatBeTable[i].procpid == procpid)
-		{
-			/*
-			 * That's him. Add an entry to the known to be dead backends.
-			 * Due to possible misorder in the arrival of UDP packets it's
-			 * possible that even if we know the backend is dead, there
-			 * could still be messages queued that arrive later. Those
-			 * messages must not cause our number of backends statistics
-			 * to get screwed up, so we remember for a couple of seconds
-			 * that this PID is dead and ignore them (only the counting of
-			 * backends, not the table access stats they sent).
-			 */
-			deadbe = (PgStat_StatBeDead *) hash_search(pgStatBeDead,
-													   (void *) &procpid,
-													 HASH_ENTER, &found);
-			if (deadbe == NULL)
-			{
-				elog(LOG, "PGSTAT: dead backend hash table out of memory");
-				exit(1);
-			}
-			if (!found)
-			{
-				deadbe->backendid = i + 1;
-				deadbe->destroy = PGSTAT_DESTROY_COUNT;
-			}
-
-			/*
-			 * Declare the backend slot empty.
-			 */
-			pgStatBeTable[i].databaseid = InvalidOid;
-			return;
-		}
-	}
-
-	/*
-	 * No big problem if not found. This can happen if UDP messages arrive
-	 * out of order here.
-	 */
-}
-
-
-/* ----------
- * pgstat_write_statsfile() -
- *
- *	Tell the news.
- * ----------
- */
-static void
-pgstat_write_statsfile(void)
-{
-	HASH_SEQ_STATUS hstat;
-	HASH_SEQ_STATUS tstat;
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatTabEntry *tabentry;
-	PgStat_StatBeDead *deadbe;
-	FILE	   *fpout;
-	int			i;
-
-	/*
-	 * Open the statistics temp file to write out the current values.
-	 */
-	fpout = fopen(pgStat_tmpfname, PG_BINARY_W);
-	if (fpout == NULL)
-	{
-		elog(LOG, "PGSTAT: cannot open temp stats file %s: %m",
-			 pgStat_tmpfname);
-		return;
-	}
-
-	/*
-	 * Walk through the database table.
-	 */
-	hash_seq_init(&hstat, pgStatDBHash);
-	while ((dbentry = (PgStat_StatDBEntry *) hash_seq_search(&hstat)) != NULL)
-	{
-		/*
-		 * If this database is marked destroyed, count down and do so if
-		 * it reaches 0.
-		 */
-		if (dbentry->destroy > 0)
-		{
-			if (--(dbentry->destroy) == 0)
-			{
-				if (dbentry->tables != NULL)
-					hash_destroy(dbentry->tables);
-
-				if (hash_search(pgStatDBHash,
-								(void *) &(dbentry->databaseid),
-								HASH_REMOVE, NULL) == NULL)
-				{
-					elog(LOG, "PGSTAT: database hash table corrupted "
-							"during cleanup - abort");
-					exit(1);
-				}
-			}
-
-			/*
-			 * Don't include statistics for it.
-			 */
-			continue;
-		}
-
-		/*
-		 * Write out the DB line including the number of life backends.
-		 */
-		fputc('D', fpout);
-		fwrite(dbentry, sizeof(PgStat_StatDBEntry), 1, fpout);
-
-		/*
-		 * Walk through the databases access stats per table.
-		 */
-		hash_seq_init(&tstat, dbentry->tables);
-		while ((tabentry = (PgStat_StatTabEntry *) hash_seq_search(&tstat)) != NULL)
-		{
-			/*
-			 * If table entry marked for destruction, same as above for
-			 * the database entry.
-			 */
-			if (tabentry->destroy > 0)
-			{
-				if (--(tabentry->destroy) == 0)
-				{
-					if (hash_search(dbentry->tables,
-									(void *) &(tabentry->tableid),
-									HASH_REMOVE, NULL) == NULL)
-					{
-						elog(LOG, "PGSTAT: tables hash table for "
-								"database %d corrupted during "
-								"cleanup - abort",
-								dbentry->databaseid);
-						exit(1);
-					}
-				}
-				continue;
-			}
-
-			/*
-			 * At least we think this is still a life table. Print it's
-			 * access stats.
-			 */
-			fputc('T', fpout);
-			fwrite(tabentry, sizeof(PgStat_StatTabEntry), 1, fpout);
-		}
-
-		/*
-		 * Mark the end of this DB
-		 */
-		fputc('d', fpout);
-	}
-
-	/*
-	 * Write out the known running backends to the stats file.
-	 */
-	i = MaxBackends;
-	fputc('M', fpout);
-	fwrite(&i, sizeof(i), 1, fpout);
-
-	for (i = 0; i < MaxBackends; i++)
-	{
-		if (pgStatBeTable[i].databaseid != InvalidOid)
-		{
-			fputc('B', fpout);
-			fwrite(&pgStatBeTable[i], sizeof(PgStat_StatBeEntry), 1, fpout);
-		}
-	}
-
-	/*
-	 * No more output to be done. Close the temp file and replace the old
-	 * pgstat.stat with it's content.
-	 */
-	fputc('E', fpout);
-	if (fclose(fpout) < 0)
-	{
-		elog(LOG, "PGSTAT: Error closing temp stats file %s: %m",
-			 pgStat_tmpfname);
-	}
-	else
-	{
-		if (rename(pgStat_tmpfname, pgStat_fname) < 0)
-		{
-			elog(LOG, "PGSTAT: Cannot rename temp stats file %s: %m",
-				 pgStat_fname);
-		}
-	}
-
-	/*
-	 * Clear out the dead backends table
-	 */
-	hash_seq_init(&hstat, pgStatBeDead);
-	while ((deadbe = (PgStat_StatBeDead *) hash_seq_search(&hstat)) != NULL)
-	{
-		/*
-		 * Count down the destroy delay and remove entries where it
-		 * reaches 0.
-		 */
-		if (--(deadbe->destroy) <= 0)
-		{
-			if (hash_search(pgStatBeDead,
-							(void *) &(deadbe->procpid),
-							HASH_REMOVE, NULL) == NULL)
-			{
-				elog(LOG, "PGSTAT: dead backend hash table corrupted "
-						"during cleanup - abort");
-				exit(1);
-			}
-		}
-	}
-}
-
-
-/* ----------
- * pgstat_read_statsfile() -
- *
- *	Reads in an existing statistics collector and initializes the
- *	databases hash table (who's entries point to the tables hash tables)
- *	and the current backend table.
- * ----------
- */
-static void
-pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
-					  PgStat_StatBeEntry **betab, int *numbackends)
-{
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatDBEntry dbbuf;
-	PgStat_StatTabEntry *tabentry;
-	PgStat_StatTabEntry tabbuf;
-	HASHCTL		hash_ctl;
-	HTAB	   *tabhash = NULL;
-	FILE	   *fpin;
-	int			maxbackends = 0;
-	int			havebackends = 0;
-	bool		found;
-	MemoryContext use_mcxt;
-	int			mcxt_flags;
-
-	/*
-	 * If running in the collector we use the DynaHashCxt memory context.
-	 * If running in a backend, we use the TopTransactionContext instead,
-	 * so the caller must only know the last XactId when this call
-	 * happened to know if his tables are still valid or already gone!
-	 */
-	if (pgStatRunningInCollector)
-	{
-		use_mcxt = NULL;
-		mcxt_flags = 0;
-	}
-	else
-	{
-		use_mcxt = TopTransactionContext;
-		mcxt_flags = HASH_CONTEXT;
-	}
-
-	/*
-	 * Create the DB hashtable
-	 */
-	memset(&hash_ctl, 0, sizeof(hash_ctl));
-	hash_ctl.keysize = sizeof(Oid);
-	hash_ctl.entrysize = sizeof(PgStat_StatDBEntry);
-	hash_ctl.hash = tag_hash;
-	hash_ctl.hcxt = use_mcxt;
-	*dbhash = hash_create("Databases hash", PGSTAT_DB_HASH_SIZE, &hash_ctl,
-						  HASH_ELEM | HASH_FUNCTION | mcxt_flags);
-	if (*dbhash == NULL)
-	{
-		if (pgStatRunningInCollector)
-		{
-			elog(LOG, "PGSTAT: Creation of DB hash table failed");
-			exit(1);
-		}
-		/* in backend, can do normal error */
-		elog(ERROR, "PGSTAT: Creation of DB hash table failed");
-	}
-
-	/*
-	 * Initialize the number of known backends to zero, just in case we do
-	 * a silent error return below.
-	 */
-	if (numbackends != NULL)
-		*numbackends = 0;
-	if (betab != NULL)
-		*betab = NULL;
-
-	/*
-	 * Try to open the status file. If it doesn't exist, the backends
-	 * simply return zero for anything and the collector simply starts
-	 * from scratch with empty counters.
-	 */
-	if ((fpin = fopen(pgStat_fname, PG_BINARY_R)) == NULL)
-		return;
-
-	/*
-	 * We found an existing collector stats file. Read it and put all the
-	 * hashtable entries into place.
-	 */
-	for (;;)
-	{
-		switch (fgetc(fpin))
-		{
-				/*
-				 * 'D'	A PgStat_StatDBEntry struct describing a database
-				 * follows. Subsequently, zero to many 'T' entries will
-				 * follow until a 'd' is encountered.
-				 */
-			case 'D':
-				if (fread(&dbbuf, 1, sizeof(dbbuf), fpin) != sizeof(dbbuf))
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-
-				/*
-				 * Add to the DB hash
-				 */
-				dbentry = (PgStat_StatDBEntry *) hash_search(*dbhash,
-											  (void *) &dbbuf.databaseid,
-													 HASH_ENTER, &found);
-				if (dbentry == NULL)
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: DB hash table out of memory");
-						exit(1);
-					}
-					else
-					{
-						fclose(fpin);
-						elog(ERROR, "PGSTAT: DB hash table out of memory");
-					}
-				}
-				if (found)
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-
-				memcpy(dbentry, &dbbuf, sizeof(PgStat_StatDBEntry));
-				dbentry->tables = NULL;
-				dbentry->destroy = 0;
-				dbentry->n_backends = 0;
-
-				/*
-				 * Don't collect tables if not the requested DB
-				 */
-				if (onlydb != InvalidOid && onlydb != dbbuf.databaseid)
-					break;
-
-
-				memset(&hash_ctl, 0, sizeof(hash_ctl));
-				hash_ctl.keysize = sizeof(Oid);
-				hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
-				hash_ctl.hash = tag_hash;
-				hash_ctl.hcxt = use_mcxt;
-				dbentry->tables = hash_create("Per-database table",
-											  PGSTAT_TAB_HASH_SIZE,
-											  &hash_ctl,
-								 HASH_ELEM | HASH_FUNCTION | mcxt_flags);
-				if (dbentry->tables == NULL)
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: failed to initialize "
-							 "hash table for new database entry");
-						exit(1);
-					}
-					else
-					{
-						fclose(fpin);
-						elog(ERROR, "PGSTAT: failed to initialize "
-							 "hash table for new database entry");
-					}
-				}
-
-				/*
-				 * Arrange that following 'T's add entries to this
-				 * databases tables hash table.
-				 */
-				tabhash = dbentry->tables;
-				break;
-
-				/*
-				 * 'd'	End of this database.
-				 */
-			case 'd':
-				tabhash = NULL;
-				break;
-
-				/*
-				 * 'T'	A PgStat_StatTabEntry follows.
-				 */
-			case 'T':
-				if (fread(&tabbuf, 1, sizeof(tabbuf), fpin) != sizeof(tabbuf))
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-
-				/*
-				 * Skip if table belongs to a not requested database.
-				 */
-				if (tabhash == NULL)
-					break;
-
-				tabentry = (PgStat_StatTabEntry *) hash_search(tabhash,
-												(void *) &tabbuf.tableid,
-													 HASH_ENTER, &found);
-				if (tabentry == NULL)
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: Tab hash table out of memory");
-						exit(1);
-					}
-					else
-					{
-						fclose(fpin);
-						elog(ERROR, "PGSTAT: Tab hash table out of memory");
-					}
-				}
-
-				if (found)
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-
-				memcpy(tabentry, &tabbuf, sizeof(tabbuf));
-				break;
-
-				/*
-				 * 'M'	The maximum number of backends to expect follows.
-				 */
-			case 'M':
-				if (betab == NULL || numbackends == NULL)
-				{
-					fclose(fpin);
-					return;
-				}
-				if (fread(&maxbackends, 1, sizeof(maxbackends), fpin) !=
-					sizeof(maxbackends))
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-				if (maxbackends == 0)
-				{
-					fclose(fpin);
-					return;
-				}
-
-				/*
-				 * Allocate space (in TopTransactionContext too) for the
-				 * backend table.
-				 */
-				if (use_mcxt == NULL)
-					*betab = (PgStat_StatBeEntry *) malloc(
-							   sizeof(PgStat_StatBeEntry) * maxbackends);
-				else
-					*betab = (PgStat_StatBeEntry *) MemoryContextAlloc(
-																use_mcxt,
-							   sizeof(PgStat_StatBeEntry) * maxbackends);
-				break;
-
-				/*
-				 * 'B'	A PgStat_StatBeEntry follows.
-				 */
-			case 'B':
-				if (betab == NULL || numbackends == NULL)
-				{
-					fclose(fpin);
-					return;
-				}
-				if (*betab == NULL)
-				{
-					fclose(fpin);
-					return;
-				}
-
-				/*
-				 * Read it directly into the table.
-				 */
-				if (fread(&(*betab)[havebackends], 1,
-						  sizeof(PgStat_StatBeEntry), fpin) !=
-					sizeof(PgStat_StatBeEntry))
-				{
-					if (pgStatRunningInCollector)
-					{
-						elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-					else
-					{
-						elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-						fclose(fpin);
-						return;
-					}
-				}
-
-				/*
-				 * Count backends per database here.
-				 */
-				dbentry = (PgStat_StatDBEntry *) hash_search(*dbhash,
-						   (void *) &((*betab)[havebackends].databaseid),
-														HASH_FIND, NULL);
-				if (dbentry)
-					dbentry->n_backends++;
-
-				havebackends++;
-				if (numbackends != 0)
-					*numbackends = havebackends;
-				if (havebackends >= maxbackends)
-				{
-					fclose(fpin);
-					return;
-				}
-				break;
-
-				/*
-				 * 'E'	The EOF marker of a complete stats file.
-				 */
-			case 'E':
-				fclose(fpin);
-				return;
-
-			default:
-				if (pgStatRunningInCollector)
-				{
-					elog(LOG, "PGSTAT: corrupted pgstat.stat file");
-					fclose(fpin);
-					return;
-				}
-				else
-				{
-					elog(WARNING, "PGSTAT: corrupted pgstat.stat file");
-					fclose(fpin);
-					return;
-				}
-		}
-	}
-
-	fclose(fpin);
-}
-
-
-/* ----------
- * pgstat_recv_bestart() -
- *
- *	Process a backend starup message.
- * ----------
- */
-static void
-pgstat_recv_bestart(PgStat_MsgBestart *msg, int len)
-{
-	pgstat_add_backend(&msg->m_hdr);
-}
-
-
-/* ----------
- * pgstat_recv_beterm() -
- *
- *	Process a backend termination message.
- * ----------
- */
-static void
-pgstat_recv_beterm(PgStat_MsgBeterm *msg, int len)
-{
-	pgstat_sub_backend(msg->m_hdr.m_procpid);
-}
-
-
-/* ----------
- * pgstat_recv_activity() -
- *
- *	Remember what the backend is doing.
- * ----------
- */
-static void
-pgstat_recv_activity(PgStat_MsgActivity *msg, int len)
-{
-	/*
-	 * Here we check explicitly for 0 return, since we don't want to
-	 * mangle the activity of an active backend by a delayed packed from a
-	 * dead one.
-	 */
-	if (pgstat_add_backend(&msg->m_hdr) != 0)
-		return;
-
-	strncpy(pgStatBeTable[msg->m_hdr.m_backendid - 1].activity,
-			msg->m_what, PGSTAT_ACTIVITY_SIZE);
-}
-
-
-/* ----------
- * pgstat_recv_tabstat() -
- *
- *	Count what the backend has done.
- * ----------
- */
-static void
-pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
-{
-	PgStat_TableEntry *tabmsg = &(msg->m_entry[0]);
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatTabEntry *tabentry;
-	int			i;
-	bool		found;
-
-	/*
-	 * Make sure the backend is counted for.
-	 */
-	if (pgstat_add_backend(&msg->m_hdr) < 0)
-		return;
-
-	/*
-	 * Lookup the database in the hashtable.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-									 (void *) &(msg->m_hdr.m_databaseid),
-												 HASH_FIND, NULL);
-	if (!dbentry)
-		return;
-
-	/*
-	 * If the database is marked for destroy, this is a delayed UDP packet
-	 * and not worth being counted.
-	 */
-	if (dbentry->destroy > 0)
-		return;
-
-	dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
-	dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
-
-	/*
-	 * Process all table entries in the message.
-	 */
-	for (i = 0; i < msg->m_nentries; i++)
-	{
-		tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
-											  (void *) &(tabmsg[i].t_id),
-													 HASH_ENTER, &found);
-		if (tabentry == NULL)
-		{
-			elog(LOG, "PGSTAT: tables hash table out of memory for "
-					"database %d - abort", dbentry->databaseid);
-			exit(1);
-		}
-
-		if (!found)
-		{
-			/*
-			 * If it's a new table entry, initialize counters to the
-			 * values we just got.
-			 */
-			tabentry->numscans = tabmsg[i].t_numscans;
-			tabentry->tuples_returned = tabmsg[i].t_tuples_returned;
-			tabentry->tuples_fetched = tabmsg[i].t_tuples_fetched;
-			tabentry->tuples_inserted = tabmsg[i].t_tuples_inserted;
-			tabentry->tuples_updated = tabmsg[i].t_tuples_updated;
-			tabentry->tuples_deleted = tabmsg[i].t_tuples_deleted;
-			tabentry->blocks_fetched = tabmsg[i].t_blocks_fetched;
-			tabentry->blocks_hit = tabmsg[i].t_blocks_hit;
-
-			tabentry->destroy = 0;
-		}
-		else
-		{
-			/*
-			 * Otherwise add the values to the existing entry.
-			 */
-			tabentry->numscans += tabmsg[i].t_numscans;
-			tabentry->tuples_returned += tabmsg[i].t_tuples_returned;
-			tabentry->tuples_fetched += tabmsg[i].t_tuples_fetched;
-			tabentry->tuples_inserted += tabmsg[i].t_tuples_inserted;
-			tabentry->tuples_updated += tabmsg[i].t_tuples_updated;
-			tabentry->tuples_deleted += tabmsg[i].t_tuples_deleted;
-			tabentry->blocks_fetched += tabmsg[i].t_blocks_fetched;
-			tabentry->blocks_hit += tabmsg[i].t_blocks_hit;
-		}
-
-		/*
-		 * And add the block IO to the database entry.
-		 */
-		dbentry->n_blocks_fetched += tabmsg[i].t_blocks_fetched;
-		dbentry->n_blocks_hit += tabmsg[i].t_blocks_hit;
-	}
-}
-
-
-/* ----------
- * pgstat_recv_tabpurge() -
- *
- *	Arrange for dead table removal.
- * ----------
- */
-static void
-pgstat_recv_tabpurge(PgStat_MsgTabpurge *msg, int len)
-{
-	PgStat_StatDBEntry *dbentry;
-	PgStat_StatTabEntry *tabentry;
-	int			i;
-
-	/*
-	 * Make sure the backend is counted for.
-	 */
-	if (pgstat_add_backend(&msg->m_hdr) < 0)
-		return;
-
-	/*
-	 * Lookup the database in the hashtable.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-									 (void *) &(msg->m_hdr.m_databaseid),
-												 HASH_FIND, NULL);
-	if (!dbentry)
-		return;
-
-	/*
-	 * If the database is marked for destroy, this is a delayed UDP packet
-	 * and the tables will go away at DB destruction.
-	 */
-	if (dbentry->destroy > 0)
-		return;
-
-	/*
-	 * Process all table entries in the message.
-	 */
-	for (i = 0; i < msg->m_nentries; i++)
-	{
-		tabentry = (PgStat_StatTabEntry *) hash_search(dbentry->tables,
-										   (void *) &(msg->m_tableid[i]),
-													   HASH_FIND, NULL);
-		if (tabentry)
-			tabentry->destroy = PGSTAT_DESTROY_COUNT;
-	}
-}
-
-
-/* ----------
- * pgstat_recv_dropdb() -
- *
- *	Arrange for dead database removal
- * ----------
- */
-static void
-pgstat_recv_dropdb(PgStat_MsgDropdb *msg, int len)
-{
-	PgStat_StatDBEntry *dbentry;
-
-	/*
-	 * Make sure the backend is counted for.
-	 */
-	if (pgstat_add_backend(&msg->m_hdr) < 0)
-		return;
-
-	/*
-	 * Lookup the database in the hashtable.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-										   (void *) &(msg->m_databaseid),
-												 HASH_FIND, NULL);
-	if (!dbentry)
-		return;
-
-	/*
-	 * Mark the database for destruction.
-	 */
-	dbentry->destroy = PGSTAT_DESTROY_COUNT;
-}
-
-
-/* ----------
- * pgstat_recv_dropdb() -
- *
- *	Arrange for dead database removal
- * ----------
- */
-static void
-pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
-{
-	HASHCTL		hash_ctl;
-	PgStat_StatDBEntry *dbentry;
-
-	/*
-	 * Make sure the backend is counted for.
-	 */
-	if (pgstat_add_backend(&msg->m_hdr) < 0)
-		return;
-
-	/*
-	 * Lookup the database in the hashtable.
-	 */
-	dbentry = (PgStat_StatDBEntry *) hash_search(pgStatDBHash,
-									 (void *) &(msg->m_hdr.m_databaseid),
-												 HASH_FIND, NULL);
-	if (!dbentry)
-		return;
-
-	/*
-	 * We simply throw away all the databases table entries by recreating
-	 * a new hash table for them.
-	 */
-	if (dbentry->tables != NULL)
-		hash_destroy(dbentry->tables);
-
-	dbentry->tables = NULL;
-	dbentry->n_xact_commit = 0;
-	dbentry->n_xact_rollback = 0;
-	dbentry->n_blocks_fetched = 0;
-	dbentry->n_blocks_hit = 0;
-	dbentry->n_connects = 0;
-	dbentry->destroy = 0;
-
-	memset(&hash_ctl, 0, sizeof(hash_ctl));
-	hash_ctl.keysize = sizeof(Oid);
-	hash_ctl.entrysize = sizeof(PgStat_StatTabEntry);
-	hash_ctl.hash = tag_hash;
-	dbentry->tables = hash_create("Per-database table",
-								  PGSTAT_TAB_HASH_SIZE,
-								  &hash_ctl,
-								  HASH_ELEM | HASH_FUNCTION);
-	if (dbentry->tables == NULL)
-	{
-		elog(LOG, "PGSTAT: failed to reinitialize hash table for "
-				"database entry");
-		exit(1);
-	}
-}