Make struct event_packet_header explicitly declared

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

diff --git a/common-trace-format-proposal.txt b/common-trace-format-proposal.txt
index 6e234350ad4bd779e286532df454864ae32e3009..35c1e71b4c662abdfb509149c2a7ca73ade1ef27 100644 (file)
--- a/common-trace-format-proposal.txt
+++ b/common-trace-format-proposal.txt
@@ -582,12 +582,21 @@ Metadata-defined layout (event packet context):
 
 5.1 Event Packet Header Fixed Layout Description
 
+The event packet header layout is indicated by the trace packet.header
+field. Here is an example structure type for the packet header with the
+fields typically expected:
+
 struct event_packet_header {
   uint32_t magic;
   uint8_t  trace_uuid[16];
   uint32_t stream_id;
 };
 
+trace {
+  ...
+  packet.header := struct event_packet_header;
+};
+
 5.2 Event Packet Context Description
 
 Event packet context example. These are declared within the stream declaration
@@ -885,6 +894,11 @@ trace {
   major = value;                               /* Trace format version */
   minor = value;
   uuid = "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa";       /* Trace UUID */
+  packet.header := struct {
+    uint32_t magic;
+    uint8_t  trace_uuid[16];
+    uint32_t stream_id;
+  };
 };
 
 stream {