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authorLudovic Courtès <ludo@gnu.org>2015-05-09 22:28:03 +0200
committerLudovic Courtès <ludo@gnu.org>2015-05-09 23:53:36 +0200
commitc217cbd84d7aee7414945a6cf85e1d704fff6e32 (patch)
tree0bc04a347f1b450e4739a3e767f6b92f6be7463e /gnu
parent54d6223d2c240c0214c123e0b0aa977a01a3c209 (diff)
services: dhcp-client: Better track dhclient's PID.
* gnu/services/networking.scm (dhcp-client-service)[start]: Remove PID-FILE first. When 'call-with-input-file' throws ENOENT, try again.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/services/networking.scm16
1 files changed, 15 insertions, 1 deletions
diff --git a/gnu/services/networking.scm b/gnu/services/networking.scm
index f9d262d977..33ecf9ccd3 100644
--- a/gnu/services/networking.scm
+++ b/gnu/services/networking.scm
@@ -165,6 +165,8 @@ Protocol (DHCP) client, on all the non-loopback network interfaces."
(provision '(networking))
(start #~(lambda _
+ (false-if-exception (delete-file #$pid-file))
+
;; When invoked without any arguments, 'dhclient'
;; discovers all non-loopback interfaces *that are
;; up*. However, the relevant interfaces are
@@ -178,7 +180,19 @@ Protocol (DHCP) client, on all the non-loopback network interfaces."
"-pf" #$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