Major changes for the daemon data transmission

[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.h

diff --git a/liblttsessiondcomm/liblttsessiondcomm.h b/liblttsessiondcomm/liblttsessiondcomm.h
index f4180cf0a4cd65413b46f6e6f575068cdf7cac02..6d6290d0a455cf34e2ec6ed043bdb471864a63f3 100644 (file)
--- a/liblttsessiondcomm/liblttsessiondcomm.h
+++ b/liblttsessiondcomm/liblttsessiondcomm.h
@@ -75,6 +75,7 @@ enum lttcomm_return_code {
        LTTCOMM_LIST_FAIL,              /* Listing apps fail */
        LTTCOMM_NO_APPS,                /* No traceable application */
        LTTCOMM_NO_SESS,                /* No sessions available */
+       LTTCOMM_FATAL,                  /* Session daemon had a fatal error */
        LTTCOMM_NR,                             /* Last element */
 };
 
@@ -115,7 +116,11 @@ struct lttcomm_session_msg {
 };
 
 /*
- * Data structure for the lttng client response
+ * Data structure for the lttng client response.
+ *
+ * This data structure is the control struct use in
+ * the header of the transmission. NEVER put variable
+ * size data in here.
  */
 struct lttcomm_lttng_msg {
        enum lttcomm_command_type cmd_type;
@@ -123,22 +128,7 @@ struct lttcomm_lttng_msg {
        uuid_t session_id;
        pid_t pid;
        char trace_name[NAME_MAX];
-       /* This flag indicates how many packet are in
-        * the transmission. Ex: If list apps is requested,
-        * and there is 4 pids registered, num_pckt will be 4
-        */
-       unsigned int num_pckt;
-       union {
-               /* UST_LIST_APPS */
-               struct {
-                       pid_t pid;
-               } list_apps;
-               /* LTTNG_LIST_SESSIONS */
-               struct {
-                       char name[NAME_MAX];
-                       char uuid[37];  /* See libuuid not exported size UUID_STR_LEN */
-               } list_sessions;
-       } u;
+       unsigned int size_payload;
 };
 
 extern int lttcomm_create_unix_sock(const char *pathname);