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commit 3e346a2a84b099766ea8a3a4a4549f6172483062
Author: Ludovic Courtès <ludo@gnu.org>
Date: Sun Dec 3 22:30:03 2017 +0100
service: In 'exec-command', close open ports before 'execl'.
This gets rid of annoying "Bad file descriptor" warnings from shepherd.
* modules/shepherd/service.scm (exec-command): In 'loop', invoke
'close-port' and the ports returned by (fdes->ports i).
diff --git a/modules/shepherd/service.scm b/modules/shepherd/service.scm
index b2d8bc5..0ad28a0 100644
--- a/modules/shepherd/service.scm
+++ b/modules/shepherd/service.scm
@@ -1,5 +1,5 @@
;; service.scm -- Representation of services.
-;; Copyright (C) 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;; Copyright (C) 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;; Copyright (C) 2002, 2003 Wolfgang Järling <wolfgang@pro-linux.de>
;; Copyright (C) 2014 Alex Sassmannshausen <alex.sassmannshausen@gmail.com>
;; Copyright (C) 2016 Alex Kost <alezost@gmail.com>
@@ -744,6 +744,14 @@ false."
(let loop ((i 3))
(when (< i max-fd)
+ ;; First try to close any ports associated with file descriptor I.
+ ;; Otherwise the finalization thread might get around to closing
+ ;; those ports eventually, which will raise an EBADF exception (on
+ ;; 2.2), leading to messages like "error in the finalization
+ ;; thread: Bad file descriptor".
+ (for-each (lambda (port)
+ (catch-system-error (close-port port)))
+ (fdes->ports i))
(catch-system-error (close-fdes i))
(loop (+ i 1)))))
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