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pipe.go
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pipe.go
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// Copyright 2012 The can Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package can
import (
"io"
)
type pipeDev struct {
r, w chan Msg
Unversioned
}
func NewPipe() (Device, Device) {
c1 := make(chan Msg, 16)
c2 := make(chan Msg, 16)
return &pipeDev{r: c1, w: c2}, &pipeDev{r: c2, w: c1}
}
func (d *pipeDev) Read(buf []Msg) (n int, err error) {
var ok bool
if len(buf) == 0 {
return
}
buf[0], ok = <-d.r
if !ok {
err = io.EOF
close(d.w)
} else {
n = 1
}
return
}
func (d *pipeDev) Write(msgs []Msg) (n int, err error) {
for i := range msgs {
d.w <- msgs[i]
n++
}
return
}
func (d *pipeDev) WriteMsg(m *Msg) (err error) {
d.w <- *m
return
}
func (d *pipeDev) Close() (err error) {
close(d.w)
return
}
func (d *pipeDev) ID() string { return "pipe" }