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use lock to remove race conditions in bringing up ppp and dhcp that would lead to multiple active processes

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@5298 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
2006-10-26 01:33:36 +00:00
parent 81ddc1b91c
commit 0d67238dc6
3 changed files with 26 additions and 5 deletions
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14
package/base-files/default/sbin/ifdown
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@@ -12,14 +12,24 @@ debug "### ifdown $cfg ###"
config_get proto "$cfg" proto
[ -z "$proto" ] && { echo "interface not found."; exit; }
# make sure all locks are removed
for lock in "/var/lock/dhcp-$iface" "/var/lock/ppp-$iface"; do
[ -f "$lock" ] && {
lock -u "$lock"
sleep 1
}
done
# kill active ppp daemon and other processes
config_get ifname "$cfg" ifname
pids="$(cat /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid 2>/dev/null)"
for pid in $pids; do
[ -d "/proc/$pid" ] && {
kill $pid
sleep 1
[ -d "/proc/$pid" ] && kill -9 $pid
[ -d "/proc/$pid" ] && {
sleep 1
kill -9 $pid 2>/dev/null >/dev/null
}
}
done
rm -f /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid