cli: Introduce a logfile command to log errors to a file
The evolution would be to introduce libosmocore and start using
the logging framework. But even then we can map this option to
the file target.
Fixes: SYS#263
diff --git a/ggsn/cmdline.ggo b/ggsn/cmdline.ggo
index e7e0f66..5bb05dc 100644
--- a/ggsn/cmdline.ggo
+++ b/ggsn/cmdline.ggo
@@ -31,5 +31,5 @@
option "apn" a "Access point name" string default="internet" no
option "qos" q "Requested quality of service" int default="0x0b921f" no
-
+option "logfile" - "Logfile for errors" string no