Source file
src/net/tcpsock_posix.go
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7 package net
8
9 import (
10 "context"
11 "io"
12 "os"
13 "syscall"
14 )
15
16 func sockaddrToTCP(sa syscall.Sockaddr) Addr {
17 switch sa := sa.(type) {
18 case *syscall.SockaddrInet4:
19 return &TCPAddr{IP: sa.Addr[0:], Port: sa.Port}
20 case *syscall.SockaddrInet6:
21 return &TCPAddr{IP: sa.Addr[0:], Port: sa.Port, Zone: zoneCache.name(int(sa.ZoneId))}
22 }
23 return nil
24 }
25
26 func (a *TCPAddr) family() int {
27 if a == nil || len(a.IP) <= IPv4len {
28 return syscall.AF_INET
29 }
30 if a.IP.To4() != nil {
31 return syscall.AF_INET
32 }
33 return syscall.AF_INET6
34 }
35
36 func (a *TCPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
37 if a == nil {
38 return nil, nil
39 }
40 return ipToSockaddr(family, a.IP, a.Port, a.Zone)
41 }
42
43 func (a *TCPAddr) toLocal(net string) sockaddr {
44 return &TCPAddr{loopbackIP(net), a.Port, a.Zone}
45 }
46
47 func (c *TCPConn) readFrom(r io.Reader) (int64, error) {
48 if n, err, handled := splice(c.fd, r); handled {
49 return n, err
50 }
51 if n, err, handled := sendFile(c.fd, r); handled {
52 return n, err
53 }
54 return genericReadFrom(c, r)
55 }
56
57 func (sd *sysDialer) dialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
58 if h := sd.testHookDialTCP; h != nil {
59 return h(ctx, sd.network, laddr, raddr)
60 }
61 if h := testHookDialTCP; h != nil {
62 return h(ctx, sd.network, laddr, raddr)
63 }
64 return sd.doDialTCP(ctx, laddr, raddr)
65 }
66
67 func (sd *sysDialer) doDialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
68 ctrlCtxFn := sd.Dialer.ControlContext
69 if ctrlCtxFn == nil && sd.Dialer.Control != nil {
70 ctrlCtxFn = func(cxt context.Context, network, address string, c syscall.RawConn) error {
71 return sd.Dialer.Control(network, address, c)
72 }
73 }
74 fd, err := internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_STREAM, 0, "dial", ctrlCtxFn)
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100 for i := 0; i < 2 && (laddr == nil || laddr.Port == 0) && (selfConnect(fd, err) || spuriousENOTAVAIL(err)); i++ {
101 if err == nil {
102 fd.Close()
103 }
104 fd, err = internetSocket(ctx, sd.network, laddr, raddr, syscall.SOCK_STREAM, 0, "dial", ctrlCtxFn)
105 }
106
107 if err != nil {
108 return nil, err
109 }
110 return newTCPConn(fd, sd.Dialer.KeepAlive, testHookSetKeepAlive), nil
111 }
112
113 func selfConnect(fd *netFD, err error) bool {
114
115 if err != nil {
116 return false
117 }
118
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125
126
127 if fd.laddr == nil || fd.raddr == nil {
128 return true
129 }
130 l := fd.laddr.(*TCPAddr)
131 r := fd.raddr.(*TCPAddr)
132 return l.Port == r.Port && l.IP.Equal(r.IP)
133 }
134
135 func spuriousENOTAVAIL(err error) bool {
136 if op, ok := err.(*OpError); ok {
137 err = op.Err
138 }
139 if sys, ok := err.(*os.SyscallError); ok {
140 err = sys.Err
141 }
142 return err == syscall.EADDRNOTAVAIL
143 }
144
145 func (ln *TCPListener) ok() bool { return ln != nil && ln.fd != nil }
146
147 func (ln *TCPListener) accept() (*TCPConn, error) {
148 fd, err := ln.fd.accept()
149 if err != nil {
150 return nil, err
151 }
152 return newTCPConn(fd, ln.lc.KeepAlive, nil), nil
153 }
154
155 func (ln *TCPListener) close() error {
156 return ln.fd.Close()
157 }
158
159 func (ln *TCPListener) file() (*os.File, error) {
160 f, err := ln.fd.dup()
161 if err != nil {
162 return nil, err
163 }
164 return f, nil
165 }
166
167 func (sl *sysListener) listenTCP(ctx context.Context, laddr *TCPAddr) (*TCPListener, error) {
168 var ctrlCtxFn func(cxt context.Context, network, address string, c syscall.RawConn) error
169 if sl.ListenConfig.Control != nil {
170 ctrlCtxFn = func(cxt context.Context, network, address string, c syscall.RawConn) error {
171 return sl.ListenConfig.Control(network, address, c)
172 }
173 }
174 fd, err := internetSocket(ctx, sl.network, laddr, nil, syscall.SOCK_STREAM, 0, "listen", ctrlCtxFn)
175 if err != nil {
176 return nil, err
177 }
178 return &TCPListener{fd: fd, lc: sl.ListenConfig}, nil
179 }
180
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