go rawconn_test 源码
golang rawconn_test 代码
文件路径：/src/os/rawconn_test.go
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test use of raw connections.
//
//go:build !plan9 && !js
package os_test
import (
"os"
"syscall"
"testing"
)
func TestRawConnReadWrite(t *testing.T) {
t.Parallel()
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
defer r.Close()
defer w.Close()
rconn, err := r.SyscallConn()
if err != nil {
t.Fatal(err)
}
wconn, err := w.SyscallConn()
if err != nil {
t.Fatal(err)
}
var operr error
err = wconn.Write(func(s uintptr) bool {
_, operr = syscall.Write(syscallDescriptor(s), []byte{'b'})
return operr != syscall.EAGAIN
})
if err != nil {
t.Fatal(err)
}
if operr != nil {
t.Fatal(err)
}
var n int
buf := make([]byte, 1)
err = rconn.Read(func(s uintptr) bool {
n, operr = syscall.Read(syscallDescriptor(s), buf)
return operr != syscall.EAGAIN
})
if err != nil {
t.Fatal(err)
}
if operr != nil {
t.Fatal(operr)
}
if n != 1 {
t.Errorf("read %d bytes, expected 1", n)
}
if buf[0] != 'b' {
t.Errorf("read %q, expected %q", buf, "b")
}
}
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