[PATCH 2/3] Don't print "process finished" into the stderr buffer.

[Philipp Stephani <p.stephani2@gmail.com>]

* src/process.c (syms_of_process): Add 'ignore' symbol.
(Fmake_process): Use it as sentinel for the standard error pipe
process.

* test/src/process-tests.el (make-process/stderr-sentinel): New unit
test.
---
 src/process.c             |  5 ++++-
 test/src/process-tests.el | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/process.c b/src/process.c
index c357a8bdc3..dcc9dcb31e 100644
--- a/src/process.c
+++ b/src/process.c
@@ -1714,7 +1714,9 @@ usage: (make-process &rest ARGS)  */)
 			  QCbuffer,
 			  Fget_buffer_create (xstderr),
 			  QCnoquery,
-			  query_on_exit ? Qnil : Qt);
+			  query_on_exit ? Qnil : Qt,
+			  QCsentinel,
+			  Qignore);
     }
 
   proc = make_process (name);
@@ -8184,6 +8186,7 @@ syms_of_process (void)
 	  "internal-default-process-sentinel");
   DEFSYM (Qinternal_default_process_filter,
 	  "internal-default-process-filter");
+  DEFSYM (Qignore, "ignore");
 #endif
   DEFSYM (Qpri, "pri");
   DEFSYM (Qnice, "nice");
diff --git a/test/src/process-tests.el b/test/src/process-tests.el
index b1b4665c3c..838ba78acb 100644
--- a/test/src/process-tests.el
+++ b/test/src/process-tests.el
@@ -199,5 +199,23 @@ process-test-sentinel-wait-function-working-p
       (should (eq (process-exit-status process) 0))
       (should (equal (buffer-string) "stdout\nstderr\n")))))
 
+(ert-deftest make-process/stderr-sentinel ()
+  "Check that `make-process' doesn't install the default sentinel for stderr."
+  (skip-unless (executable-find shell-file-name))
+  (with-temp-buffer
+    (let ((process (make-process
+                    :name "stderr-sentinel"
+                    :command (list shell-file-name shell-command-switch
+                                   "echo stderr >&2")
+                    :buffer nil
+                    :stderr (current-buffer)
+                    :noquery t
+                    :connection-type 'pipe)))
+      (while (process-live-p process)
+        (accept-process-output process))
+      (should (eq (process-status process) 'exit))
+      (should (eq (process-exit-status process) 0))
+      (should (equal (buffer-string) "stderr\n")))))
+
 (provide 'process-tests)
 ;; process-tests.el ends here.
-- 
2.17.0.484.g0c8726318c-goog