func RunChild(argv0 string, argv []string, envv []string, dir string, stderr *os.File) (*Child, error) {
cmd := exec.Command(argv0)
cmd.Args = argv
cmd.Env = envv
cmd.Dir = dir
cmd.Stderr = stderr
parentW, err := cmd.StdinPipe()
if err != nil {
return nil, err
}
parentR, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
err = cmd.Start()
if err != nil {
parentW.Close()
parentR.Close()
return nil, err
}
parent := moreio.NewReadWriteCloser(parentR, parentW)
client := rpc.NewClient(parent)
c := Child{
cmd: cmd,
client: client,
}
return &c, nil
}
func child() {
logger := log.New(os.Stderr, "child: ", log.Ldate|log.Ltime)
logger.Println("child mode")
echo := new(Echo)
rpc.Register(echo)
m := moreio.NewReadWriteCloser(os.Stdin, os.Stdout)
rpc.ServeConn(m)
}