From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 2 Feb 2012 16:41:58 +0000 (-0500)
Subject: Verify UST comm proto version
X-Git-Tag: v2.0-pre19~6
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=3f2c5fcc29e125fd43d1c63e422a389e82a3379f;p=lttng-tools.git

Verify UST comm proto version

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c
index 778880487..2b66b92c0 100644
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -1275,6 +1275,13 @@ int ust_app_register(struct ust_register_msg *msg, int sock)
 		close(sock);
 		return -EINVAL;
 	}
+	if (msg->major != LTTNG_UST_COMM_MAJOR) {
+		ERR("Registration failed: application \"%s\" (pid: %d) has "
+			"communication protocol version %u.%u, but sessiond supports 2.x.\n",
+			msg->name, msg->pid, msg->major, msg->minor);
+		close(sock);
+		return -EINVAL;
+	}
 	lta = zmalloc(sizeof(struct ust_app));
 	if (lta == NULL) {
 		PERROR("malloc");
diff --git a/src/bin/lttng-sessiond/ust-app.h b/src/bin/lttng-sessiond/ust-app.h
index 0fb854fbe..5bfecdb47 100644
--- a/src/bin/lttng-sessiond/ust-app.h
+++ b/src/bin/lttng-sessiond/ust-app.h
@@ -24,7 +24,8 @@
 #include "trace-ust.h"
 
 /* lttng-ust supported version. */
-#define UST_APP_MAJOR_VERSION         1
+#define LTTNG_UST_COMM_MAJOR          2	/* comm protocol major version */
+#define UST_APP_MAJOR_VERSION         2 /* UST version supported */
 
 #define UST_APP_EVENT_LIST_SIZE 32