use lock to remove race conditions in bringing up ppp and dhcp that would lead to multiple active processes
SVN-Revision: 5298
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3d497ab62c
commit
9abdf580d9
3 changed files with 26 additions and 5 deletions
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@ -121,8 +121,12 @@ setup_interface() {
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;;
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dhcp)
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# prevent udhcpc from starting more than once
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lock "/var/lock/dhcp-$iface"
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pid="$(cat "$pidfile" 2>/dev/null)"
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[ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && return 0
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[ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
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lock -u "/var/lock/dhcp-$iface"
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return 0
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}
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config_get ipaddr "$config" ipaddr
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config_get netmask "$config" netmask
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@ -135,6 +139,7 @@ setup_interface() {
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# don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
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[ "$proto1" != "$proto" ] && dhcpopts="-n -q"
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$DEBUG udhcpc -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} -b -p "$pidfile" ${dhcpopts:- -R &}
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lock -u "/var/lock/dhcp-$iface"
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;;
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*)
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if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
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@ -12,14 +12,24 @@ debug "### ifdown $cfg ###"
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config_get proto "$cfg" proto
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[ -z "$proto" ] && { echo "interface not found."; exit; }
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# make sure all locks are removed
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for lock in "/var/lock/dhcp-$iface" "/var/lock/ppp-$iface"; do
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[ -f "$lock" ] && {
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lock -u "$lock"
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sleep 1
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}
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done
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# kill active ppp daemon and other processes
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config_get ifname "$cfg" ifname
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pids="$(cat /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid 2>/dev/null)"
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for pid in $pids; do
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[ -d "/proc/$pid" ] && {
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kill $pid
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[ -d "/proc/$pid" ] && {
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sleep 1
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[ -d "/proc/$pid" ] && kill -9 $pid
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kill -9 $pid 2>/dev/null >/dev/null
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}
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}
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done
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rm -f /var/run/${ifname}.pid /var/run/ppp-${cfg}.pid
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@ -9,8 +9,12 @@ start_pppd() {
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local cfg="$1"; shift
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# make sure only one pppd process is started
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lock "/var/lock/ppp-${cfg}"
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local pid="$(cat /var/run/ppp-${cfg}.pid 2>/dev/null)"
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[ -d "/proc/$pid" ] && grep pppd "/proc/$pid/cmdline" 2>/dev/null >/dev/null && return 0
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[ -d "/proc/$pid" ] && grep pppd "/proc/$pid/cmdline" 2>/dev/null >/dev/null && {
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lock -u "/var/lock/ppp-${cfg}"
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return 0
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}
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config_get device "$cfg" device
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config_get unit "$cfg" unit
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@ -31,4 +35,6 @@ start_pppd() {
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${username:+user "$username" password "$password"} \
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linkname "$cfg" \
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ipparam "$cfg"
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lock -u "/var/lock/ppp-${cfg}"
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}
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