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authorFelix Fietkau <nbd@openwrt.org>2006-10-26 01:33:36 +0000
committerFelix Fietkau <nbd@openwrt.org>2006-10-26 01:33:36 +0000
commit9abdf580d910e13ade68cbb23da9b5d83b839f8d (patch)
tree382be136f0a8f3b8b8d4bd9fd78555d78bf17cc4 /package/ppp/files
parent3d497ab62c19ed66b3b69ba7b01d8f7d095c3f83 (diff)
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use lock to remove race conditions in bringing up ppp and dhcp that would lead to multiple active processes
SVN-Revision: 5298
Diffstat (limited to 'package/ppp/files')
-rw-r--r--package/ppp/files/ppp.sh10
1 files changed, 8 insertions, 2 deletions
diff --git a/package/ppp/files/ppp.sh b/package/ppp/files/ppp.sh
index 1334005..35572a0 100644
--- a/package/ppp/files/ppp.sh
+++ b/package/ppp/files/ppp.sh
@@ -7,10 +7,14 @@ scan_ppp() {
start_pppd() {
local cfg="$1"; shift
-
+
# make sure only one pppd process is started
+ lock "/var/lock/ppp-${cfg}"
local pid="$(cat /var/run/ppp-${cfg}.pid 2>/dev/null)"
- [ -d "/proc/$pid" ] && grep pppd "/proc/$pid/cmdline" 2>/dev/null >/dev/null && return 0
+ [ -d "/proc/$pid" ] && grep pppd "/proc/$pid/cmdline" 2>/dev/null >/dev/null && {
+ lock -u "/var/lock/ppp-${cfg}"
+ return 0
+ }
config_get device "$cfg" device
config_get unit "$cfg" unit
@@ -31,4 +35,6 @@ start_pppd() {
${username:+user "$username" password "$password"} \
linkname "$cfg" \
ipparam "$cfg"
+
+ lock -u "/var/lock/ppp-${cfg}"
}