Index: printers.c
===================================================================
--- printers.c	(revision 4627)
+++ printers.c	(working copy)
@@ -48,6 +48,9 @@
  *                            desktop tools.
  *   write_irix_state()     - Update the status files used by IRIX printing
  *                            desktop tools.
+ *   check_printer_state_at_load() - Check the printer state at load time.
+ *                                   For now just verify that a backend exists
+ *                                   to support the specified printer.
  */
 
 /*
@@ -66,6 +69,8 @@
 static void	write_irix_state(printer_t *p);
 #endif /* __sgi */
 
+static void check_printer_state_at_load(printer_t *p);
+
 
 /*
  * 'AddPrinter()' - Add a printer to the system.
@@ -876,6 +881,8 @@
       {
         SetPrinterAttrs(p);
 	AddPrinterHistory(p);
+        check_printer_state_at_load(p);
+
         p = NULL;
       }
       else
@@ -2684,5 +2691,35 @@
 
 
 /*
+ * 'check_printer_state_at_load()' - Check the printer state at load time.
+ *      For now just verify that a backend exists to support the specified
+ *      printer.
+ */
+
+static void
+check_printer_state_at_load(printer_t *p)		/* I - Printer to check */
+{
+   char		scheme[255];		/* Scheme protion of device URI */
+   char      command[1024];	/* Full path to backend command */
+   struct stat stat_buf;      /* stat buffer for receiving file status */
+   
+   if (!p || !p->device_uri)
+      return;
+   
+   if (strncmp(p->device_uri, "file:", 5) != 0)
+   {
+      sscanf(p->device_uri, "%254[^:]", scheme);
+      snprintf(command, sizeof(command), "%s/backend/%s", ServerBin, scheme);
+      
+      if (stat(command, &stat_buf) && errno == ENOENT)
+      {
+         LogMessage(L_ERROR, "Backend \"%s\" does not exist.", command);
+         
+         StopPrinter(p, 1);
+      }
+   }
+}
+
+/*
  * End of "$Id$".
  */