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642ab409c1
This maintains `direction` and `value` `File`s for each DigitalPin implementation. Instead of Open/Read/Close we now only do Seek/Read, this speeds up Read/Write operations a bit. A silly benchmark on the mock FS gives: benchmark old ns/op new ns/op delta BenchmarkDigitalRead-8 647 7.36 -98.86% benchmark old allocs new allocs delta BenchmarkDigitalRead-8 5 0 -100.00% benchmark old bytes new bytes delta BenchmarkDigitalRead-8 96 0 -100.00%
44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
package sysfs
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import (
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"os"
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)
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// A File represents basic IO interactions with the underlying file system
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type File interface {
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Write(b []byte) (n int, err error)
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WriteString(s string) (ret int, err error)
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Sync() (err error)
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Read(b []byte) (n int, err error)
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ReadAt(b []byte, off int64) (n int, err error)
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Seek(offset int64, whence int) (ret int64, err error)
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Fd() uintptr
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Close() error
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}
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// Filesystem opens files and returns either a native file system or user defined
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type Filesystem interface {
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OpenFile(name string, flag int, perm os.FileMode) (file File, err error)
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}
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// NativeFilesystem represents the native file system implementation
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type NativeFilesystem struct{}
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// Default to the host filesystem.
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var fs Filesystem = &NativeFilesystem{}
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// SetFilesystem sets the filesystem implementation.
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func SetFilesystem(f Filesystem) {
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fs = f
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}
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// OpenFile calls os.OpenFile().
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func (fs *NativeFilesystem) OpenFile(name string, flag int, perm os.FileMode) (file File, err error) {
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return os.OpenFile(name, flag, perm)
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}
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// OpenFile calls either the NativeFilesystem or user defined OpenFile
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func OpenFile(name string, flag int, perm os.FileMode) (file File, err error) {
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return fs.OpenFile(name, flag, perm)
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}
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