struct lttng_channel: split protocol ABI from instrumentation ABI

[lttng-ust.git] / liblttng-ust / ust-events-internal.h

diff --git a/liblttng-ust/ust-events-internal.h b/liblttng-ust/ust-events-internal.h
index e9f14fc480e2139bdfe68b6b8edea742b0e8b696..bed7a85c6cf3a7c85342f6b1e4e95fa9dfd107ce 100644 (file)
--- a/liblttng-ust/ust-events-internal.h
+++ b/liblttng-ust/ust-events-internal.h
@@ -342,6 +342,32 @@ struct lttng_ust_channel_ops_private {
                            struct lttng_ust_shm_handle *handle);
 };
 
+/*
+ * IMPORTANT: this structure is part of the ABI between the consumer
+ * daemon and the UST library within traced applications. Changing it
+ * breaks the UST communication protocol.
+ *
+ * TODO: remove unused fields on next UST communication protocol
+ * breaking update.
+ */
+struct lttng_ust_abi_channel_config {
+       void *unused1;
+       int unused2;
+       void *unused3;
+       void *unused4;
+       int unused5;
+       struct cds_list_head unused6;
+       void *unused7;
+       int unused8;
+       void *unused9;
+
+       /* Channel ID */
+       unsigned int id;
+       enum lttng_ust_abi_chan_type unused10;
+       unsigned char uuid[LTTNG_UST_UUID_LEN]; /* Trace session unique ID */
+       int unused11:1;
+};
+
 static inline
 struct lttng_ust_type_integer *lttng_ust_get_type_integer(struct lttng_ust_type_common *type)
 {