From 99e395e3b1379c12a382544d597dc12bd9293592 Mon Sep 17 00:00:00 2001
From: Bin Lu <bin.lu@arm.com>
Date: Fri, 28 Feb 2020 14:52:01 +0800
Subject: passed the syscall test case 'clock_getres' on Arm64 platform

Test command:
	bazel test //test/syscalls:clock_getres_test_runsc_ptrace

Signed-off-by: Bin Lu <bin.lu@arm.com>
---
 vdso/vdso.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vdso/vdso.cc b/vdso/vdso.cc
index 8bb80a7a4..c2585d592 100644
--- a/vdso/vdso.cc
+++ b/vdso/vdso.cc
@@ -126,6 +126,10 @@ extern "C" int __kernel_clock_getres(clockid_t clock, struct timespec* res) {
     case CLOCK_REALTIME:
     case CLOCK_MONOTONIC:
     case CLOCK_BOOTTIME: {
+      if (res == nullptr) {
+        return 0;
+      }
+
       res->tv_sec = 0;
       res->tv_nsec = 1;
       break;
-- 
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