Add a new variable `inhibit-interaction'

* doc/lispref/elisp.texi (Top): Add a link.
* doc/lispref/errors.texi (Standard Errors): Mention the new error.

* doc/lispref/minibuf.texi (Minibuffers): Add a link.
(Inhibiting Interaction): New node.

* src/data.c (syms_of_data): Define the `inhibited-interaction' error.

* src/lisp.h: Export the barfing function.

* src/lread.c (Fread_char, Fread_event, Fread_char_exclusive):
Barf if inhibited.

* src/minibuf.c (barf_if_interaction_inhibited): New function.
(Fread_from_minibuffer, Fread_no_blanks_input): Barf if inhibited.
(syms_of_minibuf): Define the `inhibit-interaction' variable.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 28dffef73ac..f2aa158d9d6 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1537,6 +1537,12 @@ that makes it a valid button.
 
 ** Miscellaneous
 
++++
+*** New variable 'inhibit-interaction' to make user prompts signal an error.
+If this is bound to something non-nil, functions like
+`read-from-minibuffer', `read-char' (and related) will signal an
+`inhibited-interaction' error.
+
 ---
 *** 'process-attributes' now works under OpenBSD, too.