From dbf9b7606dd665f3ee31e383bef02a4e981bf1ef Mon Sep 17 00:00:00 2001
From: Chris Hanson <org/chris-hanson/cph>
Date: Wed, 2 Jan 2019 01:30:06 -0500
Subject: [PATCH] Fix problem with crashing in Emacs interface.

---
 src/runtime/emacs.scm | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/src/runtime/emacs.scm b/src/runtime/emacs.scm
index 451a79073..614db701f 100644
--- a/src/runtime/emacs.scm
+++ b/src/runtime/emacs.scm
@@ -178,22 +178,21 @@ USA.
 
 (define (emacs/gc-start port)
   (output-port/flush-output port)
-  (cwb (output-port-channel port) gc-start-bytes))
+  (cwb console-output-channel gc-start-bytes))
 
 (define (emacs/gc-finish port)
-  (cwb (output-port-channel port) gc-end-bytes))
+  (declare (ignore port))
+  (cwb console-output-channel gc-end-bytes))
 
 (define (transmit-signal port type)
-  (let ((channel (output-port-channel port))
-	(buffer (string->utf8 (string #\esc type))))
+  (let ((buffer (string->utf8 (string #\esc type))))
     (output-port/flush-output port)
     (with-absolutely-no-interrupts
      (lambda ()
-       (cwb channel buffer)))))
+       (cwb console-output-channel buffer)))))
 
 (define (transmit-signal-with-argument port type string)
-  (let ((channel (output-port-channel port))
-	(buffer
+  (let ((buffer
 	 (let ((builder (bytevector-builder)))
 	   (builder (char->integer #\esc))
 	   (builder (char->integer type))
@@ -203,7 +202,7 @@ USA.
     (output-port/flush-output port)
     (with-absolutely-no-interrupts
      (lambda ()
-       (cwb channel buffer)))))
+       (cwb console-output-channel buffer)))))
 
 (define (cwb channel bytes)
   ;; This is a private copy of CHANNEL-WRITE-BLOCK that bypasses all
@@ -226,6 +225,7 @@ USA.
 
 (define gc-start-bytes)
 (define gc-end-bytes)
+(define console-output-channel)
 (define vanilla-console-port-type)
 (define emacs-console-port-type)
 
@@ -236,6 +236,7 @@ USA.
   (set! gc-end-bytes
 	(bytevector (char->integer #\esc)
 		    (char->integer #\e)))
+  (set! console-output-channel (output-port-channel the-console-port))
   (set! vanilla-console-port-type (textual-port-type the-console-port))
   (set! emacs-console-port-type
 	(make-textual-port-type
-- 
2.25.1