First implementation

vendor/periph.io/x/periph/host/sysfs/sysfs.go

@@ -0,0 +1,62 @@
+// Copyright 2017 The Periph Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package sysfs
+
+import (
+	"io"
+
+	"periph.io/x/periph/host/fs"
+)
+
+var ioctlOpen = ioctlOpenDefault
+
+func ioctlOpenDefault(path string, flag int) (ioctlCloser, error) {
+	f, err := fs.Open(path, flag)
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+var fileIOOpen = fileIOOpenDefault
+
+func fileIOOpenDefault(path string, flag int) (fileIO, error) {
+	f, err := fs.Open(path, flag)
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+type ioctlCloser interface {
+	io.Closer
+	fs.Ioctler
+}
+
+type fileIO interface {
+	Fd() uintptr
+	fs.Ioctler
+	io.Closer
+	io.Reader
+	io.Seeker
+	io.Writer
+}
+
+// seekRead seeks to the beginning of a file and reads it.
+func seekRead(f fileIO, b []byte) (int, error) {
+	if _, err := f.Seek(0, 0); err != nil {
+		return 0, err
+	}
+	return f.Read(b)
+}
+
+// seekWrite seeks to the beginning of a file and writes to it.
+func seekWrite(f fileIO, b []byte) error {
+	if _, err := f.Seek(0, 0); err != nil {
+		return err
+	}
+	_, err := f.Write(b)
+	return err
+}