X-Git-Url: http://git.liburcu.org/?p=lttng-ust.git;a=blobdiff_plain;f=include%2Flttng%2Fust-events.h;h=938e12bcd248cdd31f9352d42c88de30fed34b46;hp=4b31c0e1a9d7ee9bff03208ebdc121f79d3a89e0;hb=f9ec4a97118c6ba6001af5a85d63512e0fc441a1;hpb=04f0b55a6bafe380a1b9ce93267d5a7da963cbf9

diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index 4b31c0e1..938e12bc 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -503,6 +503,13 @@ struct lttng_channel_ops {
 	void (*channel_destroy)(struct lttng_channel *chan);
 	union {
 		void *_deprecated1;
+		/*
+		 * has_strcpy is needed by probe providers version 1.0 to
+		 * dynamically detect whether the LTTng-UST tracepoint
+		 * provider ABI implements event_strcpy. Starting from
+		 * probe providers version 2.0, the check is not needed,
+		 * but backward compatibility is provided for older versions.
+		 */
 		unsigned long has_strcpy:1;		/* ABI has strcpy */
 	} u;
 	void *_deprecated2;