gomemif: introduce gomemif

golang native memif driver

Type: feature

Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Change-Id: I693156a44011c80025245d25134f5bf5db6eba82
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/extras/gomemif/memif/interface_unsafe.go b/extras/gomemif/memif/interface_unsafe.go
new file mode 100644
index 00000000000..f5cbc2ed207
--- /dev/null
+++ b/extras/gomemif/memif/interface_unsafe.go
@@ -0,0 +1,40 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * 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 memif
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// memfdCreate returns memory file file descriptor (memif.sys_memfd_create)
+func memfdCreate() (mfd int, err error) {
+	p0, err := syscall.BytePtrFromString("memif_region_0")
+	if err != nil {
+		return -1, fmt.Errorf("memfdCreate: %s", err)
+	}
+
+	u_mfd, _, errno := syscall.Syscall(sys_memfd_create, uintptr(unsafe.Pointer(p0)), uintptr(mfd_allow_sealing), uintptr(0))
+	if errno != 0 {
+		return -1, fmt.Errorf("memfdCreate: %s", os.NewSyscallError("memfd_create", errno))
+	}
+
+	return int(u_mfd), nil
+}