Add x_catch_errors_with_handler.

* src/xterm.c (struct x_error_message_stack): Add new fields for a
callback function and associated data pointer.
(x_error_catcher): If the callback function is set, call it after
saving the error message string.
(x_catch_errors_with_handler): Renamed from x_catch_errors but now
accepts a callback function and data pointer.
(x_catch_errors): Now a wrapper function.
* src/xterm.h (x_special_error_handler): New typedef.
(x_catch_errors_with_handler): Declare.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/xterm.h b/src/xterm.h
index fe3455ff7ce..f7d2803ff29 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -1024,8 +1024,13 @@ XrmDatabase x_load_resources (Display *, const char *, const char *,
 
 /* Defined in xterm.c */
 
+typedef void (*x_special_error_handler)(Display *, XErrorEvent *, char *,
+                                        void *);
+
 extern bool x_text_icon (struct frame *, const char *);
 extern void x_catch_errors (Display *);
+extern void x_catch_errors_with_handler (Display *, x_special_error_handler,
+                                         void *);
 extern void x_check_errors (Display *, const char *)
   ATTRIBUTE_FORMAT_PRINTF (2, 0);
 extern bool x_had_errors_p (Display *);