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Subject: bug#78757: shepherd: dangling file descriptor to /dev/console
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Hello,

All shepherd children have an open file descriptor to /dev/console,
probably because of the use of dup2 (and not dup3) in system.scm.

The pb. disapears if I force that flag with that code before I define
my services (context: shepherd used as init system on Debian):
(port-for-each (lambda (x)
                 (catch #t
		   (lambda ()
		     (when (= (fcntl x F_GETFD) 0)
		       (fcntl x F_SETFD FD_CLOEXEC)
		       (format #t "FD_CLOEXEC flag set on port ~a (fd: ~a)\n" x (port->fdes x))))
		   (lambda (keys . args) (format #t "fcntl error for port ~a\n" x)))
		 ))


Sincerely.

-- 

Bernard

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: burban@HIDDEN
Subject: bug#78757: Acknowledgement (shepherd: dangling file descriptor to
 /dev/console)
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Subject: bug#78757: shepherd: dangling file descriptor to /dev/console
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Hi burban,

burban--- via Bug reports for GNU Guix <bug-guix@HIDDEN> writes:

> All shepherd children have an open file descriptor to /dev/console,
> probably because of the use of dup2 (and not dup3) in system.scm.

I checked the /proc/PID/fd directory of several of my system services on
Guix System (nscd, guix-publish, ntpd, upower-daemon) and I don=E2=80=99t s=
ee
any file descriptor pointing to /dev/console, with version 1.0.5.

You said you=E2=80=99re on Debian; which version of the Shepherd is it?

I also don=E2=80=99t see any =E2=80=98dup2=E2=80=99 call in =E2=80=98system=
.scm=E2=80=99; this takes place
rather in =E2=80=98service.scm=E2=80=99.

> The pb. disapears if I force that flag with that code before I define
> my services (context: shepherd used as init system on Debian):
> (port-for-each (lambda (x)
>                  (catch #t
> 		   (lambda ()
> 		     (when (=3D (fcntl x F_GETFD) 0)
> 		       (fcntl x F_SETFD FD_CLOEXEC)
> 		       (format #t "FD_CLOEXEC flag set on port ~a (fd: ~a)\n" x (port->=
fdes x))))
> 		   (lambda (keys . args) (format #t "fcntl error for port ~a\n" x)))
> 		 ))

=E2=80=98shepherd=E2=80=99 marks all previously-opened FDs as O_CLOEXEC upf=
ront=E2=80=94see
=E2=80=98mark-as-close-on-exec=E2=80=99 in =E2=80=98shepherd.scm=E2=80=99. =
 Those opened later are
opened with O_CLOEXEC, except for user code that explicitly omits the
O_CLOEXEC flag.

Thanks,
Ludo=E2=80=99.

Last modified: Fri, 13 Jun 2025 23:00:02 UTC

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