summaryrefslogtreecommitdiffstats
path: root/src/net/fd_plan9.go
blob: da41bc0c34cac599b0c916b240777084ecc7c402 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
// Copyright 2009 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 (
	"internal/poll"
	"io"
	"os"
	"syscall"
	"time"
)

// Network file descriptor.
type netFD struct {
	pfd poll.FD

	// immutable until Close
	net               string
	n                 string
	dir               string
	listen, ctl, data *os.File
	laddr, raddr      Addr
	isStream          bool
}

var netdir = "/net" // default network

func newFD(net, name string, listen, ctl, data *os.File, laddr, raddr Addr) (*netFD, error) {
	ret := &netFD{
		net:    net,
		n:      name,
		dir:    netdir + "/" + net + "/" + name,
		listen: listen,
		ctl:    ctl, data: data,
		laddr: laddr,
		raddr: raddr,
	}
	ret.pfd.Destroy = ret.destroy
	return ret, nil
}

func (fd *netFD) init() error {
	// stub for future fd.pd.Init(fd)
	return nil
}

func (fd *netFD) name() string {
	var ls, rs string
	if fd.laddr != nil {
		ls = fd.laddr.String()
	}
	if fd.raddr != nil {
		rs = fd.raddr.String()
	}
	return fd.net + ":" + ls + "->" + rs
}

func (fd *netFD) ok() bool { return fd != nil && fd.ctl != nil }

func (fd *netFD) destroy() {
	if !fd.ok() {
		return
	}
	err := fd.ctl.Close()
	if fd.data != nil {
		if err1 := fd.data.Close(); err1 != nil && err == nil {
			err = err1
		}
	}
	if fd.listen != nil {
		if err1 := fd.listen.Close(); err1 != nil && err == nil {
			err = err1
		}
	}
	fd.ctl = nil
	fd.data = nil
	fd.listen = nil
}

func (fd *netFD) Read(b []byte) (n int, err error) {
	if !fd.ok() || fd.data == nil {
		return 0, syscall.EINVAL
	}
	n, err = fd.pfd.Read(fd.data.Read, b)
	if fd.net == "udp" && err == io.EOF {
		n = 0
		err = nil
	}
	return
}

func (fd *netFD) Write(b []byte) (n int, err error) {
	if !fd.ok() || fd.data == nil {
		return 0, syscall.EINVAL
	}
	return fd.pfd.Write(fd.data.Write, b)
}

func (fd *netFD) closeRead() error {
	if !fd.ok() {
		return syscall.EINVAL
	}
	return syscall.EPLAN9
}

func (fd *netFD) closeWrite() error {
	if !fd.ok() {
		return syscall.EINVAL
	}
	return syscall.EPLAN9
}

func (fd *netFD) Close() error {
	if err := fd.pfd.Close(); err != nil {
		return err
	}
	if !fd.ok() {
		return syscall.EINVAL
	}
	if fd.net == "tcp" {
		// The following line is required to unblock Reads.
		_, err := fd.ctl.WriteString("close")
		if err != nil {
			return err
		}
	}
	err := fd.ctl.Close()
	if fd.data != nil {
		if err1 := fd.data.Close(); err1 != nil && err == nil {
			err = err1
		}
	}
	if fd.listen != nil {
		if err1 := fd.listen.Close(); err1 != nil && err == nil {
			err = err1
		}
	}
	fd.ctl = nil
	fd.data = nil
	fd.listen = nil
	return err
}

// This method is only called via Conn.
func (fd *netFD) dup() (*os.File, error) {
	if !fd.ok() || fd.data == nil {
		return nil, syscall.EINVAL
	}
	return fd.file(fd.data, fd.dir+"/data")
}

func (l *TCPListener) dup() (*os.File, error) {
	if !l.fd.ok() {
		return nil, syscall.EINVAL
	}
	return l.fd.file(l.fd.ctl, l.fd.dir+"/ctl")
}

func (fd *netFD) file(f *os.File, s string) (*os.File, error) {
	dfd, err := syscall.Dup(int(f.Fd()), -1)
	if err != nil {
		return nil, os.NewSyscallError("dup", err)
	}
	return os.NewFile(uintptr(dfd), s), nil
}

func setReadBuffer(fd *netFD, bytes int) error {
	return syscall.EPLAN9
}

func setWriteBuffer(fd *netFD, bytes int) error {
	return syscall.EPLAN9
}

func (fd *netFD) SetDeadline(t time.Time) error {
	return fd.pfd.SetDeadline(t)
}

func (fd *netFD) SetReadDeadline(t time.Time) error {
	return fd.pfd.SetReadDeadline(t)
}

func (fd *netFD) SetWriteDeadline(t time.Time) error {
	return fd.pfd.SetWriteDeadline(t)
}