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-rw-r--r--src/net/file_plan9.go135
1 files changed, 135 insertions, 0 deletions
diff --git a/src/net/file_plan9.go b/src/net/file_plan9.go
new file mode 100644
index 0000000..dfb23d2
--- /dev/null
+++ b/src/net/file_plan9.go
@@ -0,0 +1,135 @@
+// Copyright 2011 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.
+
+package net
+
+import (
+ "errors"
+ "io"
+ "os"
+ "syscall"
+)
+
+func (fd *netFD) status(ln int) (string, error) {
+ if !fd.ok() {
+ return "", syscall.EINVAL
+ }
+
+ status, err := os.Open(fd.dir + "/status")
+ if err != nil {
+ return "", err
+ }
+ defer status.Close()
+ buf := make([]byte, ln)
+ n, err := io.ReadFull(status, buf[:])
+ if err != nil {
+ return "", err
+ }
+ return string(buf[:n]), nil
+}
+
+func newFileFD(f *os.File) (net *netFD, err error) {
+ var ctl *os.File
+ close := func(fd int) {
+ if err != nil {
+ syscall.Close(fd)
+ }
+ }
+
+ path, err := syscall.Fd2path(int(f.Fd()))
+ if err != nil {
+ return nil, os.NewSyscallError("fd2path", err)
+ }
+ comp := splitAtBytes(path, "/")
+ n := len(comp)
+ if n < 3 || comp[0][0:3] != "net" {
+ return nil, syscall.EPLAN9
+ }
+
+ name := comp[2]
+ switch file := comp[n-1]; file {
+ case "ctl", "clone":
+ fd, err := syscall.Dup(int(f.Fd()), -1)
+ if err != nil {
+ return nil, os.NewSyscallError("dup", err)
+ }
+ defer close(fd)
+
+ dir := netdir + "/" + comp[n-2]
+ ctl = os.NewFile(uintptr(fd), dir+"/"+file)
+ ctl.Seek(0, io.SeekStart)
+ var buf [16]byte
+ n, err := ctl.Read(buf[:])
+ if err != nil {
+ return nil, err
+ }
+ name = string(buf[:n])
+ default:
+ if len(comp) < 4 {
+ return nil, errors.New("could not find control file for connection")
+ }
+ dir := netdir + "/" + comp[1] + "/" + name
+ ctl, err = os.OpenFile(dir+"/ctl", os.O_RDWR, 0)
+ if err != nil {
+ return nil, err
+ }
+ defer close(int(ctl.Fd()))
+ }
+ dir := netdir + "/" + comp[1] + "/" + name
+ laddr, err := readPlan9Addr(comp[1], dir+"/local")
+ if err != nil {
+ return nil, err
+ }
+ return newFD(comp[1], name, nil, ctl, nil, laddr, nil)
+}
+
+func fileConn(f *os.File) (Conn, error) {
+ fd, err := newFileFD(f)
+ if err != nil {
+ return nil, err
+ }
+ if !fd.ok() {
+ return nil, syscall.EINVAL
+ }
+
+ fd.data, err = os.OpenFile(fd.dir+"/data", os.O_RDWR, 0)
+ if err != nil {
+ return nil, err
+ }
+
+ switch fd.laddr.(type) {
+ case *TCPAddr:
+ return newTCPConn(fd), nil
+ case *UDPAddr:
+ return newUDPConn(fd), nil
+ }
+ return nil, syscall.EPLAN9
+}
+
+func fileListener(f *os.File) (Listener, error) {
+ fd, err := newFileFD(f)
+ if err != nil {
+ return nil, err
+ }
+ switch fd.laddr.(type) {
+ case *TCPAddr:
+ default:
+ return nil, syscall.EPLAN9
+ }
+
+ // check that file corresponds to a listener
+ s, err := fd.status(len("Listen"))
+ if err != nil {
+ return nil, err
+ }
+ if s != "Listen" {
+ return nil, errors.New("file does not represent a listener")
+ }
+
+ return &TCPListener{fd: fd}, nil
+}
+
+func filePacketConn(f *os.File) (PacketConn, error) {
+ return nil, syscall.EPLAN9
+}