From 8f21c0bb2807888d812318def43c2405c9b13f5a Mon Sep 17 00:00:00 2001
From: Neel Natu <neelnatu@google.com>
Date: Mon, 16 Jul 2018 12:19:02 -0700
Subject: Add EventOperations.HostFD()

This method allows an eventfd inside the Sentry to be registered with with
the host kernel.

Update comment about memory mapping host fds via CachingInodeOperations.

PiperOrigin-RevId: 204784859
Change-Id: I55823321e2d84c17ae0f7efaabc6b55b852ae257
---
 pkg/abi/linux/BUILD      |  1 +
 pkg/abi/linux/eventfd.go | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 pkg/abi/linux/eventfd.go

(limited to 'pkg/abi/linux')

diff --git a/pkg/abi/linux/BUILD b/pkg/abi/linux/BUILD
index e164945cf..ae7e4378c 100644
--- a/pkg/abi/linux/BUILD
+++ b/pkg/abi/linux/BUILD
@@ -30,6 +30,7 @@ go_library(
         "dev.go",
         "elf.go",
         "errors.go",
+        "eventfd.go",
         "exec.go",
         "fcntl.go",
         "file.go",
diff --git a/pkg/abi/linux/eventfd.go b/pkg/abi/linux/eventfd.go
new file mode 100644
index 000000000..bc0fb44d2
--- /dev/null
+++ b/pkg/abi/linux/eventfd.go
@@ -0,0 +1,22 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package linux
+
+// Constants for eventfd2(2).
+const (
+	EFD_SEMAPHORE = 0x1
+	EFD_CLOEXEC   = O_CLOEXEC
+	EFD_NONBLOCK  = O_NONBLOCK
+)
-- 
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