Add subsys functions for receiving/flushing states and options.

These functions are in the subsystem, not in the config_format_t,
since they are about how the format is _used_, not about _what it
is_.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/lib/subsys/subsys.h b/src/lib/subsys/subsys.h
index 1cb3fe94a5..29a90c049d 100644
--- a/src/lib/subsys/subsys.h
+++ b/src/lib/subsys/subsys.h
@@ -101,6 +101,35 @@ typedef struct subsys_fns_t {
    **/
   const struct config_format_t *state_format;
 
+  /**
+   * Receive an options object as defined by options_format. Return 0
+   * on success, -1 on failure.
+   *
+   * It is safe to store the pointer to the object until set_options()
+   * is called again. */
+  int (*set_options)(void *);
+
+  /* XXXX Add an implementation for options_act_reversible() later in this
+   * branch. */
+
+  /**
+   * Receive a state object as defined by state_format. Return 0 on success,
+   * -1 on failure.
+   *
+   * It is safe to store the pointer to the object; set_state() is only
+   * called on startup.
+   **/
+  int (*set_state)(void *);
+
+  /**
+   * Update any information that needs to be stored in the provided state
+   * object (as defined by state_format).  Return 0 on success, -1 on failure.
+   *
+   * The object provided here will be the same one as provided earlier to
+   * set_state().  This method is called when we are about to save the state
+   * to disk.
+   **/
+  int (*flush_state)(void *);
 } subsys_fns_t;
 
 /**