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services: dhcp-client: Better track dhclient's PID.

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* gnu/services/networking.scm (dhcp-client-service)[start]: Remove
  PID-FILE first.  When 'call-with-input-file' throws ENOENT, try
  again.
This commit is contained in:
Ludovic Courtès 2015-05-09 22:28:03 +02:00
parent 54d6223d2c
commit c217cbd84d
1 changed files with 15 additions and 1 deletions
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16
gnu/services/networking.scm
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@ -165,6 +165,8 @@ (define pid-file
(provision '(networking))
(start #~(lambda _
(false-if-exception (delete-file #$pid-file))
;; When invoked without any arguments, 'dhclient'
;; discovers all non-loopback interfaces *that are
;; up*. However, the relevant interfaces are
@ -178,7 +180,19 @@ (define pid-file
"-pf" #$pid-file
ifaces))))
(and (zero? (cdr (waitpid pid)))
(call-with-input-file #$pid-file read)))))
(let loop ()
(catch 'system-error
(lambda ()
(call-with-input-file #$pid-file read))
(lambda args
;; 'dhclient' returned before PID-FILE
;; was created, so try again.
(let ((errno (system-error-errno args)))
(if (= ENOENT errno)
(begin
(sleep 1)
(loop))
(apply throw args))))))))))
(stop #~(make-kill-destructor))))))
(define %ntp-servers