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, 5 insertions, 0 deletions

diff --git a/trace2.c b/trace2.c
index 2c6b570077..256120c7fd 100644
--- a/trace2.c
+++ b/trace2.c
@@ -792,3 +792,8 @@ void trace2_printf(const char *fmt, ...)
 	va_end(ap);
 }
 #endif
+
+const char *trace2_session_id(void)
+{
+	return tr2_sid_get();
+}