Initial import of the CDE 2.1.30 sources from the Open Group.

cde/lib/DtSearch/dbchange.c

@@ -0,0 +1,128 @@
+/*
+ *   COMPONENT_NAME: austext
+ *
+ *   FUNCTIONS: database_has_changed
+ *		file_has_changed
+ *
+ *   ORIGINS: 27
+ *
+ *
+ *   (C) COPYRIGHT International Business Machines Corp. 1995
+ *   All Rights Reserved
+ *   Licensed Materials - Property of IBM
+ *   US Government Users Restricted Rights - Use, duplication or
+ *   disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
+ */
+/******************************* DBCHANGE.C ********************************
+ * $XConsortium: dbchange.c /main/4 1996/05/07 13:26:54 drk $
+ * March 1995.
+ * Extracted from oe.c so it could also be called by server daemon.
+ * When called only in the engine it was only called by a child
+ * of the daemon, so the original daemon was never updated and
+ * every single engine call resulted in an engine reinitialization.
+ *
+ * $Log$
+ * Revision 2.2  1995/10/26  15:31:24  miker
+ * Added prolog.
+ *
+ * Revision 2.1  1995/09/22  19:47:12  miker
+ * Freeze DtSearch 0.1, AusText 2.1.8
+ *
+ * Revision 1.2  1995/08/31  22:18:48  miker
+ * Minor changes for DtSearch including msg catalogs and
+ * replacing socblk with usrblk for head of dblist.
+ */
+#include "SearchE.h"
+#include <errno.h>
+#include <sys/stat.h>
+
+#define PROGNAME	"DBCHANGE"
+
+/************************************************/
+/*						*/
+/*		  file_has_changed		*/
+/*						*/
+/************************************************/
+/* If site config file or any d99 file has changed
+ * since program initialization, close all databases and reinitialize.
+ * This usually happens when the administrator has updated
+ * a copy of one of the databases in a different directory.
+ * He then changes the PATH parameter for that database in the
+ * site config file.  By closing databases and reinitializing,
+ * an administrator can swap databases without bringing the users down.
+ * The test for the d99 files is included because in some systems,
+ * like cose, a database may change without a corresponding
+ * change in the site config file.
+ * Databases cannot be swapped during an ongoing search.
+ * If the passed file's mod time is unaccessible or has changed,
+ * appends msg to msglist, reinitializes engine if necessary,
+ * sets up usrblk.retncode, and returns TRUE.
+ * Otherwise returns FALSE.
+ */
+static int      file_has_changed (char *fname, time_t origtime)
+{
+    struct stat     statbuf;
+    char            sprintbuf[1024];
+
+    if (stat (fname, &statbuf) == -1) {
+	sprintf (sprintbuf, catgets (dtsearch_catd, 10, 1300,
+		"%s Unable to comply with request; cannot access status\n"
+		"  of database file '%s': %s"),
+	    PROGNAME "1300", fname, strerror (errno));
+	DtSearchAddMessage (sprintbuf);
+	usrblk.retncode = OE_NOOP;
+	return TRUE;
+    }
+    if (origtime != statbuf.st_mtime) {
+	strcpy (sprintbuf, nowstring (&origtime));
+	fprintf (aa_stderr,
+	    "%s %s reinitialized AusText engine:\n"
+	    "   changed file:       %s\n"
+	    "   old file time:      %s\n"
+	    "   current file time:  %s.\n",
+	    PROGNAME "1312", aa_argv0, fname,
+	    sprintbuf, nowstring (&statbuf.st_mtime));
+	if (!(usrblk.flags & USR_NO_INFOMSGS)) {
+	    sprintf (sprintbuf, catgets (dtsearch_catd, 10, 1313,
+		    "%s *** REQUEST CANCELED *** %s Engine reinitialized\n"
+		    "  due to modification of file %s, probably caused by\n"
+		    "  update to one or more databases."),
+		PROGNAME "1313", OE_prodname, fname);
+	    DtSearchAddMessage (sprintbuf);
+	}
+	oe_uninitialize ();
+	oe_initialize ();
+	usrblk.retncode = OE_REINIT;
+	return TRUE;
+    }
+    return FALSE;
+}  /* file_has_changed() */
+
+
+/************************************************/
+/*						*/
+/*	      database_has_changed		*/
+/*						*/
+/************************************************/
+/* Verify that none of the databases has changed since the last call.
+ * Don't check until after first initialize.
+ * Returns TRUE if any changes, else FALSE.
+ */
+int             database_has_changed (void)
+{
+    char            fnamebuf[256];
+    DBLK           *db;
+
+    if (OE_sitecnfg_mtime == 0L)
+	return FALSE;
+    if (file_has_changed (OE_sitecnfg_fname, OE_sitecnfg_mtime))
+	return TRUE;
+    for (db = usrblk.dblist; db != NULL; db = db->link) {
+	sprintf (fnamebuf, "%s%s" EXT_DTBS, db->path, db->name);
+	if (file_has_changed (fnamebuf, db->iimtime))
+	    return TRUE;
+    }
+    return FALSE;
+}  /* database_has_changed() */
+
+/******************************* DBCHANGE.C ********************************/