From 59310aec700b00bcd0ed8689a89e3e96e8eaf470 Mon Sep 17 00:00:00 2001
From: David Sheets <dsheets@docker.com>
Date: Thu, 21 Apr 2016 10:22:57 +0100
Subject: [PATCH] transfused: add a PING event for vsock RTT measurement

Signed-off-by: David Sheets <dsheets@docker.com>
---
 alpine/packages/transfused/transfused.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/alpine/packages/transfused/transfused.c b/alpine/packages/transfused/transfused.c
index d6e26c059..9f6d8780d 100644
--- a/alpine/packages/transfused/transfused.c
+++ b/alpine/packages/transfused/transfused.c
@@ -31,6 +31,7 @@
 #define DEFAULT_SOCKET "v:_:1525"
 #define DEFAULT_SERVER "v:2:1524"
 
+#define PING             128
 #define RMDIR_SYSCALL    0
 #define UNLINK_SYSCALL   1
 #define MKDIR_SYSCALL    2
@@ -509,6 +510,11 @@ void perform_syscall(connection_t * conn, uint8_t syscall, char path[]) {
 
   switch (syscall) {
 
+  case PING:
+    log_time(conn->params, "PONG");
+    r = 0;
+    break;
+
   case RMDIR_SYSCALL:
     name = "rmdir";
     r = rmdir(path);