From 196cf5ad4180bf1f9981f1523833f6de47760e7b Mon Sep 17 00:00:00 2001
From: Jia Zhang <zhang.jia@linux.alibaba.com>
Date: Fri, 28 Aug 2020 14:38:53 +0000
Subject: [PATCH] rune/libenclave: Work around nanosleep() issue

nanosleep() may return the remaining duration longer than
requested one due to timer slack.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
---
 rune/libenclave/internal/runtime/pal/pal_linux.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rune/libenclave/internal/runtime/pal/pal_linux.go b/rune/libenclave/internal/runtime/pal/pal_linux.go
index 5f2c7a6..069979b 100644
--- a/rune/libenclave/internal/runtime/pal/pal_linux.go
+++ b/rune/libenclave/internal/runtime/pal/pal_linux.go
@@ -1,5 +1,14 @@
 package enclave_runtime_pal // import "github.com/opencontainers/runc/libenclave/internal/runtime/pal"
 
+/*
+#include <sys/prctl.h>
+
+static void workaround_nanosleep(void) {
+	// nanosleep() may return the remaining duration longer than
+	// requested one due to timer slack.
+	prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
+}
+*/
 import "C"
 
 import (
@@ -26,6 +35,8 @@ func (pal *enclaveRuntimePal) Init(args string, logLevel string) error {
         }
         pal.version = ver
 
+	C.workaround_nanosleep();
+
 	return api.init(args, logLevel)
 }
 
-- 
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