From 8d47cd4992c3c3546bef23568fde5fe132144666 Mon Sep 17 00:00:00 2001
From: Yash Tibrewal <yashkt@google.com>
Date: Mon, 27 Aug 2018 14:56:01 -0700
Subject: Revert "Revert "Fathom tcp changes""

---
 src/core/lib/iomgr/internal_errqueue.h | 62 ++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/core/lib/iomgr/internal_errqueue.h

(limited to 'src/core/lib/iomgr/internal_errqueue.h')

diff --git a/src/core/lib/iomgr/internal_errqueue.h b/src/core/lib/iomgr/internal_errqueue.h
new file mode 100644
index 0000000000..fc11be9a6d
--- /dev/null
+++ b/src/core/lib/iomgr/internal_errqueue.h
@@ -0,0 +1,62 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * 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.
+ *
+ */
+
+/* This file contains constants defined in <linux/errqueue.h> and
+ * <linux/net_tstamp.h> so as to allow collecting network timestamps in the
+ * kernel. This file allows tcp_posix.cc to compile on platforms that do not
+ * have <linux/errqueue.h> and <linux/net_tstamp.h>.
+ */
+
+#ifndef GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H
+#define GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_POSIX_SOCKET_TCP
+
+#include <sys/types.h>
+#include <time.h>
+
+#ifdef GRPC_LINUX_ERRQUEUE
+#include <linux/errqueue.h>
+#include <linux/net_tstamp.h>
+#include <sys/socket.h>
+#endif /* GRPC_LINUX_ERRQUEUE */
+
+namespace grpc_core {
+
+#ifdef GRPC_LINUX_ERRQUEUE
+constexpr uint32_t kTimestampingSocketOptions = SOF_TIMESTAMPING_SOFTWARE |
+                                                SOF_TIMESTAMPING_OPT_ID |
+                                                SOF_TIMESTAMPING_OPT_TSONLY;
+constexpr uint32_t kTimestampingRecordingOptions =
+    SOF_TIMESTAMPING_TX_SCHED | SOF_TIMESTAMPING_TX_SOFTWARE |
+    SOF_TIMESTAMPING_TX_ACK;
+#endif /* GRPC_LINUX_ERRQUEUE */
+
+/* Returns true if kernel is capable of supporting errqueue and timestamping.
+ * Currently allowing only linux kernels above 4.0.0
+ */
+bool kernel_supports_errqueue();
+}  // namespace grpc_core
+
+#endif /* GRPC_POSIX_SOCKET_TCP */
+
+#endif /* GRPC_CORE_LIB_IOMGR_INTERNAL_ERRQUEUE_H */
-- 
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