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services: user-processes: Simplify and streamline ‘stop’ action.

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* gnu/services/shepherd.scm (user-processes-shepherd-service): In ‘stop’
action, remove ‘sleep*’, which is unnecessary when using Fibers, and
remove the ‘reap-children’ loop and its ‘waitpid’ call, which is
redundant with ‘waitpid’ calls made by shepherd itself and could cause
confusion.

Change-Id: I0df1733f0cbe781a0ad5fef4830d903483e0da27
This commit is contained in:
Ludovic Courtès 2025-01-25 12:38:00 +01:00
parent b4b14a49cd
commit ba9af3e151
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GPG key ID: 090B11993D9AEBB5
1 changed files with 3 additions and 28 deletions
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31
gnu/services/shepherd.scm
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@ -594,18 +594,6 @@ system mounts, etc. This is similar to the 'sysvinit' target in systemd."
(@ (ice-9 rdelim) read-string))))
'()))
(define (now)
(car (gettimeofday)))
(define (sleep* n)
;; Really sleep N seconds.
;; Work around <http://bugs.gnu.org/19581>.
(define start (now))
(let loop ((elapsed 0))
(when (> n elapsed)
(sleep (- n elapsed))
(loop (- (now) start)))))
(define lset= (@ (srfi srfi-1) lset=))
(display "sending all processes the TERM signal\n")
@ -614,7 +602,7 @@ system mounts, etc. This is similar to the 'sysvinit' target in systemd."
(begin
;; Easy: terminate all of them.
(kill -1 SIGTERM)
(sleep* #$grace-delay)
(sleep #$grace-delay)
(kill -1 SIGKILL))
(begin
;; Kill them all except OMITTED-PIDS. XXX: We would
@ -622,30 +610,17 @@ system mounts, etc. This is similar to the 'sysvinit' target in systemd."
;; processes, like 'killall5' does, but that seems
;; unreliable.
(kill-except omitted-pids SIGTERM)
(sleep* #$grace-delay)
(sleep #$grace-delay)
(kill-except omitted-pids SIGKILL)
(delete-file #$%do-not-kill-file)))
(let wait ()
;; Reap children, if any, so that we don't end up with
;; zombies and enter an infinite loop.
(let reap-children ()
(define result
(false-if-exception
(waitpid WAIT_ANY (if (null? omitted-pids)
0
WNOHANG))))
(when (and (pair? result)
(not (zero? (car result))))
(reap-children)))
(let ((pids (processes)))
(unless (lset= = pids (cons 1 omitted-pids))
(format #t "waiting for process termination\
(processes left: ~s)~%"
pids)
(sleep* 2)
(sleep 1)
(wait))))
(display "all processes have been terminated\n")