GNU bug report logs - #78757
shepherd: dangling file descriptor to /dev/console

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From: burban <at> opopop.net
To: 78757 <at> debbugs.gnu.org
Subject: bug#78757: shepherd: dangling file descriptor to /dev/console
Date: Tue, 10 Jun 2025 20:31:51 +0000

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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