From da20559137ccbf7f27e6008472f4d9159306df4a Mon Sep 17 00:00:00 2001
From: Fabricio Voznika <fvoznika@google.com>
Date: Tue, 18 Sep 2018 02:08:11 -0700
Subject: Provide better message when memfd_create fails with ENOSYS

Updates #100

PiperOrigin-RevId: 213414821
Change-Id: I90c2e6c18c54a6afcd7ad6f409f670aa31577d37
---
 pkg/sentry/usage/memory.go | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pkg/sentry/usage/memory.go')

diff --git a/pkg/sentry/usage/memory.go b/pkg/sentry/usage/memory.go
index f13a77779..92a478d85 100644
--- a/pkg/sentry/usage/memory.go
+++ b/pkg/sentry/usage/memory.go
@@ -122,6 +122,9 @@ func Init() error {
 	const name = "memory-usage"
 	fd, err := memutil.CreateMemFD(name, 0)
 	if err != nil {
+		if e, ok := err.(syscall.Errno); ok && e == syscall.ENOSYS {
+			return fmt.Errorf("memfd_create(2) is not implemented. Check that you have Linux 3.17 or higher")
+		}
 		return fmt.Errorf("error creating usage file: %v", err)
 	}
 	file := os.NewFile(uintptr(fd), name)
-- 
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