X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/f52d66ff00b24111f87c274d3d7085ef2e1d27b1..2fa68be58d30e6c73e6cfc3ccb5bb97396e5fba1:/package/ppp/files/ppp.sh

diff --git a/package/ppp/files/ppp.sh b/package/ppp/files/ppp.sh
index 343223af1..abc022741 100644
--- a/package/ppp/files/ppp.sh
+++ b/package/ppp/files/ppp.sh
@@ -7,6 +7,15 @@ scan_ppp() {
 
 start_pppd() {
 	local cfg="$1"; shift
+
+	# make sure only one pppd process is started
+	lock "/var/lock/ppp-${cfg}"
+	local pid="$(head -n1 /var/run/ppp-${cfg}.pid 2>/dev/null)"
+	[ -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 "$cfg" unit
 	config_get username "$cfg" username
@@ -26,4 +35,6 @@ start_pppd() {
 		${username:+user "$username" password "$password"} \
 		linkname "$cfg" \
 		ipparam "$cfg"
+
+	lock -u "/var/lock/ppp-${cfg}"
 }