ir: add trace UUID getter and setter

[babeltrace.git] / lib / ctf-ir / trace.c

diff --git a/lib/ctf-ir/trace.c b/lib/ctf-ir/trace.c
index fd464b015e197d7769d4da8a2fb41560eb584077..8737bfd392e793105fcb59375141814ad69d9140 100644 (file)
--- a/lib/ctf-ir/trace.c
+++ b/lib/ctf-ir/trace.c
@@ -46,6 +46,7 @@
 #include <babeltrace/endian-internal.h>
 #include <inttypes.h>
 #include <stdint.h>
+#include <string.h>
 
 #define DEFAULT_IDENTIFIER_SIZE 128
 #define DEFAULT_METADATA_STRING_SIZE 4096
@@ -101,8 +102,6 @@ struct bt_ctf_trace *bt_ctf_trace_create(void)
                goto error;
        }
 
-       /* Generate a trace UUID */
-       uuid_generate(trace->uuid);
        if (init_trace_packet_header(trace)) {
                goto error;
        }
@@ -158,6 +157,27 @@ end:
        return ret;
 }
 
+const unsigned char *bt_ctf_trace_get_uuid(struct bt_ctf_trace *trace)
+{
+       return trace && trace->uuid_set ? trace->uuid : NULL;
+}
+
+int bt_ctf_trace_set_uuid(struct bt_ctf_trace *trace, const unsigned char *uuid)
+{
+       int ret = 0;
+
+       if (!trace || !uuid || trace->frozen) {
+               ret = -1;
+               goto end;
+       }
+
+       memcpy(trace->uuid, uuid, sizeof(uuid_t));
+       trace->uuid_set = true;
+
+end:
+       return ret;
+}
+
 void bt_ctf_trace_destroy(struct bt_object *obj)
 {
        struct bt_ctf_trace *trace;
@@ -885,19 +905,27 @@ int append_trace_metadata(struct bt_ctf_trace *trace,
        unsigned char *uuid = trace->uuid;
        int ret;
 
-       g_string_append(context->string, "trace {\n");
+       if (trace->native_byte_order == BT_CTF_BYTE_ORDER_NATIVE) {
+               ret = -1;
+               goto end;
+       }
 
+       g_string_append(context->string, "trace {\n");
        g_string_append(context->string, "\tmajor = 1;\n");
        g_string_append(context->string, "\tminor = 8;\n");
        assert(trace->native_byte_order == BT_CTF_BYTE_ORDER_LITTLE_ENDIAN ||
                trace->native_byte_order == BT_CTF_BYTE_ORDER_BIG_ENDIAN ||
                trace->native_byte_order == BT_CTF_BYTE_ORDER_NETWORK);
-       g_string_append_printf(context->string,
-               "\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
-               uuid[0], uuid[1], uuid[2], uuid[3],
-               uuid[4], uuid[5], uuid[6], uuid[7],
-               uuid[8], uuid[9], uuid[10], uuid[11],
-               uuid[12], uuid[13], uuid[14], uuid[15]);
+
+       if (trace->uuid_set) {
+               g_string_append_printf(context->string,
+                       "\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
+                       uuid[0], uuid[1], uuid[2], uuid[3],
+                       uuid[4], uuid[5], uuid[6], uuid[7],
+                       uuid[8], uuid[9], uuid[10], uuid[11],
+                       uuid[12], uuid[13], uuid[14], uuid[15]);
+       }
+
        g_string_append_printf(context->string, "\tbyte_order = %s;\n",
                get_byte_order_string(trace->native_byte_order));