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-rw-r--r--src/keyboard.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/keyboard.h b/src/keyboard.h
index 96ac7d2e856..f8d8f789c08 100644
--- a/src/keyboard.h
+++ b/src/keyboard.h
@@ -190,6 +190,9 @@ extern EMACS_INT num_nonmacro_input_events;
/* Nonzero means polling for input is temporarily suppressed. */
extern int poll_suppress_count;
+/* Nonzero if we are executing from the SIGIO signal handler. */
+extern int in_sighandler;
+
/* Keymap mapping ASCII function key sequences onto their preferred forms.
Initialized by the terminal-specific lisp files. */
extern Lisp_Object Vfunction_key_map;