lib: Make the debug callbacks a list of callbacks

Allow multiple callers to initialize themselves to receive
callbacks for debug on/off operations.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 19 insertions, 5 deletions

diff --git a/lib/debug.c b/lib/debug.c
index 72fd4648ee..a39623b039 100644
--- a/lib/debug.c
+++ b/lib/debug.c
@@ -18,29 +18,43 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include <zebra.h>
+#include "typesafe.h"
 #include "debug.h"
 #include "command.h"
 
-static const struct debug_callbacks *callbacks;
+static struct debug_cb_list_head cb_head;
+
+DECLARE_LIST(debug_cb_list, struct debug_callbacks, item)
 
 /* All code in this section should be reentrant and MT-safe */
 
 DEFUN_NOSH(debug_all, debug_all_cmd, "[no] debug all",
 	   NO_STR DEBUG_STR "Toggle all debugging output\n")
 {
+	struct debug_callbacks *cb;
+
 	bool set = !strmatch(argv[0]->text, "no");
 	uint32_t mode = DEBUG_NODE2MODE(vty->node);
 
-	if (callbacks->debug_set_all)
-		callbacks->debug_set_all(mode, set);
+	frr_each (debug_cb_list, &cb_head, cb)
+		cb->debug_set_all(mode, set);
+
 	return CMD_SUCCESS;
 }
 
 /* ------------------------------------------------------------------------- */
 
-void debug_init(const struct debug_callbacks *cb)
+void debug_init(struct debug_callbacks *cb)
 {
-	callbacks = cb;
+	static bool inited = false;
+
+	if (!inited) {
+		inited = true;
+		debug_cb_list_init(&cb_head);
+	}
+
+	debug_cb_list_add_head(&cb_head, cb);
+
 	install_element(ENABLE_NODE, &debug_all_cmd);
 	install_element(CONFIG_NODE, &debug_all_cmd);
 }