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services: user-processes: Really honor the grace delay.

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* gnu/services/base.scm (user-processes-service): Change #:grace-delay
  default value to 4.  Define 'sleep*' and use it.
This commit is contained in:
Ludovic Courtès 2015-01-13 17:22:39 +01:00
parent be68177368
commit 7bed4df49a
1 changed files with 16 additions and 4 deletions
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20
gnu/services/base.scm
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@ -193,7 +193,7 @@ (define %do-not-kill-file
;; the system. Typical example is user-space file systems.
"/etc/dmd/do-not-kill")
(define* (user-processes-service requirements #:key (grace-delay 5))
(define* (user-processes-service requirements #:key (grace-delay 4))
"Return the service that is responsible for terminating all the processes so
that the root file system can be re-mounted read-only, just before
rebooting/halting. Processes still running GRACE-DELAY seconds after SIGTERM
@ -230,6 +230,18 @@ (define omitted-pids
(@ (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")
@ -238,7 +250,7 @@ (define lset= (@ (srfi srfi-1) lset=))
(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
@ -246,7 +258,7 @@ (define lset= (@ (srfi srfi-1) lset=))
;; list of 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)))
@ -256,7 +268,7 @@ (define lset= (@ (srfi srfi-1) lset=))
(format #t "waiting for process termination\
(processes left: ~s)~%"
pids)
(sleep 2)
(sleep* 2)
(wait))))
(display "all processes have been terminated\n")