Restrict updates to the newest updater

Prevent old update connections from providing updates, closing them if
they attempt an update.

In doing so, this also limits resource usage when we have multiple
updaters connected (which should never happen.)

Signed-off-by: Russell King <rmk@armlinux.org.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/resource.h b/resource.h
index c3a1907..657397b 100644
--- a/resource.h
+++ b/resource.h
@@ -9,11 +9,14 @@ struct resource;
 struct resource_ops {
 	int (*get)(struct client *c, struct resource *r);
 	void (*close)(struct client *c, struct resource *r);
+	void (*update_open)(struct client *c, struct resource *r);
 	int (*update)(struct client *c, struct resource *r, const char *m);
+	void (*update_close)(struct client *c, struct resource *r);
 };
 
 struct resource {
 	const struct resource_ops *ops;
+	struct client *updater;
 	void *data;
 };