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Add cancel handlers so it's possible to Ctrl-C clusterdb, reindexdb
and vacuumdb. ITAGAKI Takahiro, with minor fixes from me.
This commit is contained in:
Magnus Hagander
parent
bbed5ba914
commit
6e09df9d26
@ -4,7 +4,7 @@
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*
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* Portions Copyright (c) 2002-2007, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/bin/scripts/clusterdb.c,v 1.16 2007/02/13 18:06:18 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/scripts/clusterdb.c,v 1.17 2007/04/09 18:21:22 mha Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -111,6 +111,8 @@ main(int argc, char *argv[])
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exit(1);
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}
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setup_cancel_handler();
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if (alldb)
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{
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if (dbname)
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@ -159,7 +161,6 @@ cluster_one_database(const char *dbname, const char *table,
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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initPQExpBuffer(&sql);
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@ -169,12 +170,7 @@ cluster_one_database(const char *dbname, const char *table,
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appendPQExpBuffer(&sql, ";\n");
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conn = connectDatabase(dbname, host, port, username, password, progname);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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if (!executeMaintenanceCommand(conn, sql.data, echo))
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{
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if (table)
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fprintf(stderr, _("%s: clustering of table \"%s\" in database \"%s\" failed: %s"),
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@ -185,8 +181,6 @@ cluster_one_database(const char *dbname, const char *table,
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PQfinish(conn);
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exit(1);
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}
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PQclear(result);
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PQfinish(conn);
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termPQExpBuffer(&sql);
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/bin/scripts/common.c,v 1.25 2007/01/05 22:19:50 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/scripts/common.c,v 1.26 2007/04/09 18:21:22 mha Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -15,14 +15,23 @@
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#include "postgres_fe.h"
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#include <pwd.h>
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#include <signal.h>
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#include <unistd.h>
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#include "common.h"
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#include "libpq/pqsignal.h"
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static void SetCancelConn(PGconn *conn);
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static void ResetCancelConn(void);
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#ifndef HAVE_INT_OPTRESET
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int optreset;
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#endif
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static PGcancel *volatile cancelConn = NULL;
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#ifdef WIN32
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static CRITICAL_SECTION cancelConnLock;
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#endif
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/*
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* Returns the current user name.
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@ -194,6 +203,33 @@ executeCommand(PGconn *conn, const char *query,
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}
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/*
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* As above for a SQL maintenance command (returns command success).
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* Command is executed with a cancel handler set, so Ctrl-C can
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* interrupt it.
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*/
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bool
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executeMaintenanceCommand(PGconn *conn, const char *query, bool echo)
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{
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PGresult *res;
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bool r;
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if (echo)
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printf("%s\n", query);
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SetCancelConn(conn);
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res = PQexec(conn, query);
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ResetCancelConn();
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r = (res && PQresultStatus(res) == PGRES_COMMAND_OK);
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if (res)
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PQclear(res);
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return r;
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}
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/*
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* Check yes/no answer in a localized way. 1=yes, 0=no, -1=neither.
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*/
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@ -237,3 +273,135 @@ yesno_prompt(const char *question)
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_(PG_YESLETTER), _(PG_NOLETTER));
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}
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}
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/*
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* SetCancelConn
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*
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* Set cancelConn to point to the current database connection.
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*/
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static void
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SetCancelConn(PGconn *conn)
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{
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PGcancel *oldCancelConn;
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#ifdef WIN32
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EnterCriticalSection(&cancelConnLock);
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#endif
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/* Free the old one if we have one */
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oldCancelConn = cancelConn;
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/* be sure handle_sigint doesn't use pointer while freeing */
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cancelConn = NULL;
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if (oldCancelConn != NULL)
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PQfreeCancel(oldCancelConn);
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cancelConn = PQgetCancel(conn);
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#ifdef WIN32
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LeaveCriticalSection(&cancelConnLock);
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#endif
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}
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/*
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* ResetCancelConn
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*
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* Free the current cancel connection, if any, and set to NULL.
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*/
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static void
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ResetCancelConn(void)
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{
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PGcancel *oldCancelConn;
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#ifdef WIN32
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EnterCriticalSection(&cancelConnLock);
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#endif
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oldCancelConn = cancelConn;
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/* be sure handle_sigint doesn't use pointer while freeing */
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cancelConn = NULL;
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if (oldCancelConn != NULL)
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PQfreeCancel(oldCancelConn);
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#ifdef WIN32
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LeaveCriticalSection(&cancelConnLock);
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#endif
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}
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#ifndef WIN32
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/*
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* Handle interrupt signals by cancelling the current command,
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* if it's being executed through executeMaintenanceCommand(),
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* and thus has a cancelConn set.
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*/
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static void
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handle_sigint(SIGNAL_ARGS)
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{
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int save_errno = errno;
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char errbuf[256];
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/* Send QueryCancel if we are processing a database query */
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if (cancelConn != NULL)
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{
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if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
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fprintf(stderr, _("Cancel request sent\n"));
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else
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fprintf(stderr, _("Could not send cancel request: %s\n"), errbuf);
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}
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errno = save_errno; /* just in case the write changed it */
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}
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void
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setup_cancel_handler(void)
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{
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pqsignal(SIGINT, handle_sigint);
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}
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#else /* WIN32 */
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/*
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* Console control handler for Win32. Note that the control handler will
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* execute on a *different thread* than the main one, so we need to do
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* proper locking around those structures.
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*/
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static BOOL WINAPI
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consoleHandler(DWORD dwCtrlType)
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{
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char errbuf[256];
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if (dwCtrlType == CTRL_C_EVENT ||
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dwCtrlType == CTRL_BREAK_EVENT)
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{
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/* Send QueryCancel if we are processing a database query */
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EnterCriticalSection(&cancelConnLock);
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if (cancelConn != NULL)
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{
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if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
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fprintf(stderr, _("Cancel request sent\n"));
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else
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fprintf(stderr, _("Could not send cancel request: %s"), errbuf);
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}
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LeaveCriticalSection(&cancelConnLock);
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return TRUE;
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}
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else
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/* Return FALSE for any signals not being handled */
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return FALSE;
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}
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void
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setup_cancel_handler(void)
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{
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InitializeCriticalSection(&cancelConnLock);
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SetConsoleCtrlHandler(consoleHandler, TRUE);
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}
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#endif /* WIN32 */
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@ -4,7 +4,7 @@
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*
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* Copyright (c) 2003-2007, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/bin/scripts/common.h,v 1.16 2007/01/05 22:19:50 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/scripts/common.h,v 1.17 2007/04/09 18:21:22 mha Exp $
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*/
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#ifndef COMMON_H
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#define COMMON_H
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@ -35,6 +35,11 @@ extern PGresult *executeQuery(PGconn *conn, const char *query,
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extern void executeCommand(PGconn *conn, const char *query,
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const char *progname, bool echo);
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extern bool executeMaintenanceCommand(PGconn *conn, const char *query,
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bool echo);
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extern bool yesno_prompt(const char *question);
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extern void setup_cancel_handler(void);
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#endif /* COMMON_H */
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@ -4,7 +4,7 @@
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*
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/bin/scripts/reindexdb.c,v 1.9 2007/02/13 18:06:18 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/scripts/reindexdb.c,v 1.10 2007/04/09 18:21:22 mha Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -126,6 +126,8 @@ main(int argc, char *argv[])
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exit(1);
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}
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setup_cancel_handler();
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if (alldb)
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{
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if (dbname)
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@ -214,7 +216,6 @@ reindex_one_database(const char *name, const char *dbname, const char *type,
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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initPQExpBuffer(&sql);
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@ -229,11 +230,7 @@ reindex_one_database(const char *name, const char *dbname, const char *type,
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conn = connectDatabase(dbname, host, port, username, password, progname);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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if (!executeMaintenanceCommand(conn, sql.data, echo))
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{
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if (strcmp(type, "TABLE") == 0)
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fprintf(stderr, _("%s: reindexing of table \"%s\" in database \"%s\" failed: %s"),
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@ -248,7 +245,6 @@ reindex_one_database(const char *name, const char *dbname, const char *type,
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exit(1);
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}
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PQclear(result);
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PQfinish(conn);
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termPQExpBuffer(&sql);
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@ -294,27 +290,19 @@ reindex_system_catalogs(const char *dbname, const char *host, const char *port,
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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initPQExpBuffer(&sql);
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appendPQExpBuffer(&sql, "REINDEX SYSTEM %s;\n", dbname);
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conn = connectDatabase(dbname, host, port, username, password, progname);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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if (!executeMaintenanceCommand(conn, sql.data, echo))
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{
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fprintf(stderr, _("%s: reindexing of system catalogs failed: %s"),
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progname, PQerrorMessage(conn));
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PQfinish(conn);
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exit(1);
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}
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PQclear(result);
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PQfinish(conn);
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termPQExpBuffer(&sql);
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@ -5,7 +5,7 @@
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/bin/scripts/vacuumdb.c,v 1.16 2007/02/13 17:39:39 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/scripts/vacuumdb.c,v 1.17 2007/04/09 18:21:22 mha Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -128,6 +128,8 @@ main(int argc, char *argv[])
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exit(1);
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}
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setup_cancel_handler();
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if (alldb)
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{
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if (dbname)
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@ -178,7 +180,6 @@ vacuum_one_database(const char *dbname, bool full, bool verbose, bool analyze,
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PQExpBufferData sql;
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PGconn *conn;
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PGresult *result;
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initPQExpBuffer(&sql);
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@ -194,12 +195,7 @@ vacuum_one_database(const char *dbname, bool full, bool verbose, bool analyze,
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appendPQExpBuffer(&sql, ";\n");
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conn = connectDatabase(dbname, host, port, username, password, progname);
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if (echo)
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printf("%s", sql.data);
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result = PQexec(conn, sql.data);
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if (PQresultStatus(result) != PGRES_COMMAND_OK)
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if (!executeMaintenanceCommand(conn, sql.data, echo))
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{
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if (table)
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fprintf(stderr, _("%s: vacuuming of table \"%s\" in database \"%s\" failed: %s"),
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@ -210,8 +206,6 @@ vacuum_one_database(const char *dbname, bool full, bool verbose, bool analyze,
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PQfinish(conn);
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exit(1);
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}
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PQclear(result);
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PQfinish(conn);
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termPQExpBuffer(&sql);
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