plugin: store pointer to exec timeout value in the ops structure

This is required for plugins that need access to the configured execution
timeout. The global variable cannot be used as-is since we dlopen() with
RTLD_LOCAL.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

include/rpcd/plugin.h

@@ -54,6 +54,7 @@ struct rpc_daemon_ops {
                 rpc_exec_read_cb_t err, rpc_exec_done_cb_t end,
                 void *priv, struct ubus_context *ctx,
                 struct ubus_request_data *req);
+    int *exec_timeout;
 };
 
 struct rpc_plugin {

plugin.c

@@ -404,6 +404,7 @@ static const struct rpc_daemon_ops ops = {
 	.session_create_cb  = rpc_session_create_cb,
 	.session_destroy_cb = rpc_session_destroy_cb,
 	.exec               = rpc_exec,
+	.exec_timeout       = &rpc_exec_timeout,
 };
 
 static int