procd: add service instance watchdog

Added instance watchdog which will eventually either terminate
or respawn an instance depending on the instance respawn setting.

Added service ubus method 'watchdog' which services the watchdog
timer and allows update of the instance watchdog mode instance.

Two modes: disabled or passive.

Disabled: cancels watchdog timer set for a given instance.

Passive: sets a instance timer which must be serviced or the
instance will be stopped/restarted (dependent upon the instance
respawn value) when the timer expires.

Signed-off-by: Daniel Bailey <danielb@meshplusplus.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/service/instance.h b/service/instance.h
index e8ee15c..bb8a0c4 100644
--- a/service/instance.h
+++ b/service/instance.h
@@ -39,6 +39,19 @@ struct jail {
 	int argc;
 };
 
+typedef enum instance_watchdog {
+	INSTANCE_WATCHDOG_MODE_DISABLED,
+	INSTANCE_WATCHDOG_MODE_PASSIVE,
+	INSTANCE_WATCHDOG_MODE_ACTIVE,
+	__INSTANCE_WATCHDOG_MODE_MAX,
+} instance_watchdog_mode_t;
+
+struct watchdog {
+	instance_watchdog_mode_t mode;
+	uint32_t freq;
+	struct uloop_timeout timeout;
+};
+
 struct service_instance {
 	struct vlist_node node;
 	struct service *srv;
@@ -95,6 +108,8 @@ struct service_instance {
 	struct blobmsg_list file;
 	struct blobmsg_list limits;
 	struct blobmsg_list errors;
+
+	struct watchdog watchdog;
 };
 
 void instance_start(struct service_instance *in);