Some minor Tramp changes

* doc/lispref/os.texi (Timers): Speak about `remote-file-error'.

* doc/misc/tramp.texi (Frequently Asked Questions): Speak about
`remote-file-error'.
(External packages): New subsection "Timers".

* lisp/net/tramp-adb.el (tramp-adb-handle-make-process):
* lisp/net/tramp-sh.el (tramp-sh-handle-make-process): Adapt error
function.  Handle coding.

* lisp/net/tramp.el (tramp-handle-make-process): Adapt error function.

3 files changed, 18 insertions, 5 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index f6e89339b68..9ea72668e7b 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -929,7 +929,7 @@ alternative implementation will be used."
 	  (unless (or (null sentinel) (functionp sentinel))
 	    (signal 'wrong-type-argument (list #'functionp sentinel)))
 	  (unless (or (null stderr) (bufferp stderr) (stringp stderr))
-	    (signal 'wrong-type-argument (list #'stringp stderr)))
+	    (signal 'wrong-type-argument (list #'bufferp stderr)))
 	  (when (and (stringp stderr) (tramp-tramp-file-p stderr)
 		     (not (tramp-equal-remote default-directory stderr)))
 	    (signal 'file-error (list "Wrong stderr" stderr)))
@@ -981,7 +981,11 @@ alternative implementation will be used."
 		      ;; otherwise we might be interrupted by
 		      ;; `verify-visited-file-modtime'.
 		      (let ((buffer-undo-list t)
-			    (inhibit-read-only t))
+			    (inhibit-read-only t)
+			    (coding-system-for-write
+			     (if (symbolp coding) coding (car coding)))
+			    (coding-system-for-read
+			     (if (symbolp coding) coding (cdr coding))))
 			(clear-visited-file-modtime)
 			(narrow-to-region (point-max) (point-max))
 			;; We call `tramp-adb-maybe-open-connection',
diff --git a/lisp/net/tramp-sh.el b/lisp/net/tramp-sh.el
index f4a93c840cf..e30fe61de43 100644
--- a/lisp/net/tramp-sh.el
+++ b/lisp/net/tramp-sh.el
@@ -2871,7 +2871,7 @@ implementation will be used."
 	  (unless (or (null sentinel) (functionp sentinel))
 	    (signal 'wrong-type-argument (list #'functionp sentinel)))
 	  (unless (or (null stderr) (bufferp stderr) (stringp stderr))
-	    (signal 'wrong-type-argument (list #'stringp stderr)))
+	    (signal 'wrong-type-argument (list #'bufferp stderr)))
 	  (when (and (stringp stderr) (tramp-tramp-file-p stderr)
 		     (not (tramp-equal-remote default-directory stderr)))
 	    (signal 'file-error (list "Wrong stderr" stderr)))
@@ -2985,7 +2985,11 @@ implementation will be used."
 		      ;; `verify-visited-file-modtime'.
 		      (let ((buffer-undo-list t)
 			    (inhibit-read-only t)
-			    (mark (point-max)))
+			    (mark (point-max))
+			    (coding-system-for-write
+			     (if (symbolp coding) coding (car coding)))
+			    (coding-system-for-read
+			     (if (symbolp coding) coding (cdr coding))))
 			(clear-visited-file-modtime)
 			(narrow-to-region (point-max) (point-max))
 			;; We call `tramp-maybe-open-connection', in
@@ -6139,4 +6143,9 @@ function cell is returned to be applied on a buffer."
 ;;
 ;; * Implement `:stderr' of `make-process' as pipe process.
 
+;; * One interesting solution (with other applications as well) would
+;;   be to stipulate, as a directory or connection-local variable, an
+;;   additional rc file on the remote machine that is sourced every
+;;   time Tramp connects.  <https://emacs.stackexchange.com/questions/62306>
+
 ;;; tramp-sh.el ends here
diff --git a/lisp/net/tramp.el b/lisp/net/tramp.el
index 70bf1eee26b..a4865ec4f22 100644
--- a/lisp/net/tramp.el
+++ b/lisp/net/tramp.el
@@ -3788,7 +3788,7 @@ It does not support `:stderr'."
 	(unless (or (null sentinel) (functionp sentinel))
 	  (signal 'wrong-type-argument (list #'functionp sentinel)))
 	(unless (or (null stderr) (bufferp stderr))
-	  (signal 'wrong-type-argument (list #'stringp stderr)))
+	  (signal 'wrong-type-argument (list #'bufferp stderr)))
 
 	(let* ((buffer
 		(if buffer