+/* GDB's SIGINT handler basically sets a flag; code that might take a
+ long time before it gets back to the event loop, and which ought to
+ be interruptible, checks this flag using the QUIT macro, which, if
+ GDB has the terminal, throws a quit exception.
+
+ In addition to setting a flag, the SIGINT handler also marks a
+ select/poll-able file descriptor as read-ready. That is used by
+ interruptible_select in order to support interrupting blocking I/O
+ in a race-free manner.
+
+ These functions use the extension_language_ops API to allow extension
+ language(s) and GDB SIGINT handling to coexist seamlessly. */
+
+/* * Evaluate to non-zero if the quit flag is set, zero otherwise. This
+ will clear the quit flag as a side effect. */
+extern int check_quit_flag (void);
+/* * Set the quit flag. */
+extern void set_quit_flag (void);
+
+/* The current quit handler (and its type). This is called from the
+ QUIT macro. See default_quit_handler below for default behavior.
+ Parts of GDB temporarily override this to e.g., completely suppress
+ Ctrl-C because it would not be safe to throw. E.g., normally, you
+ wouldn't want to quit between a RSP command and its response, as
+ that would break the communication with the target, but you may
+ still want to intercept the Ctrl-C and offer to disconnect if the
+ user presses Ctrl-C multiple times while the target is stuck
+ waiting for the wedged remote stub. */
+typedef void (quit_handler_ftype) (void);
+extern quit_handler_ftype *quit_handler;
+
+/* The default quit handler. Checks whether Ctrl-C was pressed, and
+ if so:
+
+ - If GDB owns the terminal, throws a quit exception.
+
+ - If GDB does not own the terminal, forwards the Ctrl-C to the
+ target.
+*/
+extern void default_quit_handler (void);
+
+/* Flag that function quit should call quit_force. */
+extern volatile int sync_quit_force_run;