Variable: quit-flag
quit-flag is a variable defined in eval.c.
Value
nil
Documentation
Non-nil causes eval to abort, unless inhibit-quit is non-nil.
If the value is t, that means do an ordinary quit.
If the value equals throw-on-input, that means quit by throwing
to the tag specified in throw-on-input; it's for handling while-no-input.
Typing C-g sets quit-flag to t, regardless of inhibit-quit,
but inhibit-quit non-nil prevents anything from taking notice of that.
Source Code
// Defined in /usr/src/emacs/src/eval.c
DEFVAR_LISP ("quit-flag", Vquit_flag,
doc: /* Non-nil causes `eval' to abort, unless `inhibit-quit' is non-nil.
If the value is t, that means do an ordinary quit.
If the value equals `throw-on-input', that means quit by throwing
to the tag specified in `throw-on-input'; it's for handling `while-no-input'.
Typing C-g sets `quit-flag' to t, regardless of `inhibit-quit',
but `inhibit-quit' non-nil prevents anything from taking notice of that. */);