trace2: add a public function for getting the SID

Add a public wrapper, trace2_session_id(), around tr2_sid_get(), which
is intended to be private trace2 implementation.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/trace2.h b/trace2.h
index b18bc55..ede18c2 100644
--- a/trace2.h
+++ b/trace2.h
@@ -500,4 +500,6 @@ void trace2_collect_process_info(enum trace2_process_info_reason reason);
 	} while (0)
 #endif
 
+const char *trace2_session_id(void);
+
 #endif /* TRACE2_H */