r799: BUG 1259 -- add 'printcap cache time' patch from Lars

(This used to be commit fac90741139b953d0e88d050dd457657f0b9c9f3)

source3/param/loadparm.c

@@ -249,6 +249,7 @@ typedef struct
 	BOOL bNullPasswords;
 	BOOL bObeyPamRestrictions;
 	BOOL bLoadPrinters;
+	int PrintcapCacheTime;
 	BOOL bLargeReadwrite;
 	BOOL bReadRaw;
 	BOOL bWriteRaw;
@@ -945,6 +946,7 @@ static struct parm_struct parm_table[] = {
 	{"max reported print jobs", P_INTEGER, P_LOCAL, &sDefault.iMaxReportedPrintJobs, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
 	{"max print jobs", P_INTEGER, P_LOCAL, &sDefault.iMaxPrintJobs, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
 	{"load printers", P_BOOL, P_GLOBAL, &Globals.bLoadPrinters, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
+	{"printcap cache time", P_INTEGER, P_GLOBAL, &Globals.PrintcapCacheTime, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
 	{"printcap name", P_STRING, P_GLOBAL, &Globals.szPrintcapname, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
 	{"printcap", P_STRING, P_GLOBAL, &Globals.szPrintcapname, NULL, NULL, FLAG_HIDE}, 
 	{"printable", P_BOOL, P_LOCAL, &sDefault.bPrint_ok, NULL, NULL, FLAG_ADVANCED | FLAG_PRINT}, 
@@ -1362,6 +1364,7 @@ static void init_globals(void)
 	Globals.AlgorithmicRidBase = BASE_RID;
 
 	Globals.bLoadPrinters = True;
+	Globals.PrintcapCacheTime = 0;
 	/* Was 65535 (0xFFFF). 0x4101 matches W2K and causes major speed improvements... */
 	/* Discovered by 2 days of pain by Don McCall @ HP :-). */
 	Globals.max_xmit = 0x4104;
@@ -1614,6 +1617,7 @@ FN_GLOBAL_STRING(lp_configfile, &Globals.szConfigFile)
 FN_GLOBAL_STRING(lp_smb_passwd_file, &Globals.szSMBPasswdFile)
 FN_GLOBAL_STRING(lp_private_dir, &Globals.szPrivateDir)
 FN_GLOBAL_STRING(lp_serverstring, &Globals.szServerString)
+FN_GLOBAL_INTEGER(lp_printcap_cache_time, &Globals.PrintcapCacheTime)
 FN_GLOBAL_STRING(lp_printcapname, &Globals.szPrintcapname)
 FN_GLOBAL_STRING(lp_enumports_cmd, &Globals.szEnumPortsCommand)
 FN_GLOBAL_STRING(lp_addprinter_cmd, &Globals.szAddPrinterCommand)

source3/smbd/process.c

@@ -1078,15 +1078,41 @@ static int setup_select_timeout(void)
 void check_reload(int t)
 {
 	static time_t last_smb_conf_reload_time = 0;
+	static time_t last_load_printers_reload_time = 0;
+	time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
 
-	if(last_smb_conf_reload_time == 0)
+	if(last_smb_conf_reload_time == 0) {
 		last_smb_conf_reload_time = t;
+		/* Our printing subsystem might not be ready at smbd start up.
+		   Then no printer is available till the first printers check
+		   is performed.  A lower initial interval circumvents this. */
+		if ( printcap_cache_time > 60 )
+			last_load_printers_reload_time = t - printcap_cache_time + 60;
+		else
+			last_load_printers_reload_time = t;
+	}
 
 	if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
 		reload_services(True);
 		reload_after_sighup = False;
 		last_smb_conf_reload_time = t;
 	}
+
+	/* 'printcap cache time = 0' disable the feature */
+	
+	if ( printcap_cache_time != 0 )
+	{ 
+		/* see if it's time to reload or if the clock has been set back */
+		
+		if ( (t >= last_load_printers_reload_time+printcap_cache_time) 
+			|| (t-last_load_printers_reload_time  < 0) ) 
+		{
+			DEBUG( 3,( "Printcap cache time expired.\n"));
+			remove_stale_printers();
+			load_printers();
+			last_load_printers_reload_time = t;
+		}
+	}
 }
 
 /****************************************************************************

source3/smbd/service.c

@@ -826,3 +826,27 @@ void close_cnum(connection_struct *conn, uint16 vuid)
 
 	conn_free(conn);
 }
+
+/****************************************************************************
+ Remove stale printers
+****************************************************************************/
+
+void remove_stale_printers( void )
+{
+	int snum, iNumServices, printersServiceNum;
+	const char *pname;
+
+	iNumServices = lp_numservices();
+	printersServiceNum = lp_servicenumber( PRINTERS_NAME);
+	for( snum = 0; snum < iNumServices; snum++) {
+		/* Never remove PRINTERS_NAME */
+		if ( snum == printersServiceNum)
+			continue;
+		pname = lp_printername( snum);
+		/* Is snum a print service and still in the printing subsystem? */
+		if ( lp_print_ok( snum) && !pcap_printername_ok( pname, NULL)) {
+			DEBUG( 3, ( "Removing printer: %s\n", pname));
+			lp_killservice( snum);
+		}
+	}
+}