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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [udpsock_posix.go] - Blame information for rev 848

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// 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.
 
// +build darwin freebsd linux netbsd openbsd windows
 
// UDP sockets
 
package net
 
import (
        "errors"
        "os"
        "syscall"
        "time"
)
 
var ErrWriteToConnected = errors.New("use of WriteTo with pre-connected UDP")
 
func sockaddrToUDP(sa syscall.Sockaddr) Addr {
        switch sa := sa.(type) {
        case *syscall.SockaddrInet4:
                return &UDPAddr{sa.Addr[0:], sa.Port}
        case *syscall.SockaddrInet6:
                return &UDPAddr{sa.Addr[0:], sa.Port}
        }
        return nil
}
 
func (a *UDPAddr) family() int {
        if a == nil || len(a.IP) <= IPv4len {
                return syscall.AF_INET
        }
        if a.IP.To4() != nil {
                return syscall.AF_INET
        }
        return syscall.AF_INET6
}
 
func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
        return ipToSockaddr(family, a.IP, a.Port)
}
 
func (a *UDPAddr) toAddr() sockaddr {
        if a == nil { // nil *UDPAddr
                return nil // nil interface
        }
        return a
}
 
// UDPConn is the implementation of the Conn and PacketConn
// interfaces for UDP network connections.
type UDPConn struct {
        fd *netFD
}
 
func newUDPConn(fd *netFD) *UDPConn { return &UDPConn{fd} }
 
func (c *UDPConn) ok() bool { return c != nil && c.fd != nil }
 
// Implementation of the Conn interface - see Conn for documentation.
 
// Read implements the Conn Read method.
func (c *UDPConn) Read(b []byte) (int, error) {
        if !c.ok() {
                return 0, os.EINVAL
        }
        return c.fd.Read(b)
}
 
// Write implements the Conn Write method.
func (c *UDPConn) Write(b []byte) (int, error) {
        if !c.ok() {
                return 0, os.EINVAL
        }
        return c.fd.Write(b)
}
 
// Close closes the UDP connection.
func (c *UDPConn) Close() error {
        if !c.ok() {
                return os.EINVAL
        }
        err := c.fd.Close()
        c.fd = nil
        return err
}
 
// LocalAddr returns the local network address.
func (c *UDPConn) LocalAddr() Addr {
        if !c.ok() {
                return nil
        }
        return c.fd.laddr
}
 
// RemoteAddr returns the remote network address, a *UDPAddr.
func (c *UDPConn) RemoteAddr() Addr {
        if !c.ok() {
                return nil
        }
        return c.fd.raddr
}
 
// SetDeadline implements the Conn SetDeadline method.
func (c *UDPConn) SetDeadline(t time.Time) error {
        if !c.ok() {
                return os.EINVAL
        }
        return setDeadline(c.fd, t)
}
 
// SetReadDeadline implements the Conn SetReadDeadline method.
func (c *UDPConn) SetReadDeadline(t time.Time) error {
        if !c.ok() {
                return os.EINVAL
        }
        return setReadDeadline(c.fd, t)
}
 
// SetWriteDeadline implements the Conn SetWriteDeadline method.
func (c *UDPConn) SetWriteDeadline(t time.Time) error {
        if !c.ok() {
                return os.EINVAL
        }
        return setWriteDeadline(c.fd, t)
}
 
// SetReadBuffer sets the size of the operating system's
// receive buffer associated with the connection.
func (c *UDPConn) SetReadBuffer(bytes int) error {
        if !c.ok() {
                return os.EINVAL
        }
        return setReadBuffer(c.fd, bytes)
}
 
// SetWriteBuffer sets the size of the operating system's
// transmit buffer associated with the connection.
func (c *UDPConn) SetWriteBuffer(bytes int) error {
        if !c.ok() {
                return os.EINVAL
        }
        return setWriteBuffer(c.fd, bytes)
}
 
// UDP-specific methods.
 
// ReadFromUDP reads a UDP packet from c, copying the payload into b.
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFromUDP can be made to time out and return an error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err error) {
        if !c.ok() {
                return 0, nil, os.EINVAL
        }
        n, sa, err := c.fd.ReadFrom(b)
        switch sa := sa.(type) {
        case *syscall.SockaddrInet4:
                addr = &UDPAddr{sa.Addr[0:], sa.Port}
        case *syscall.SockaddrInet6:
                addr = &UDPAddr{sa.Addr[0:], sa.Port}
        }
        return
}
 
// ReadFrom implements the PacketConn ReadFrom method.
func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {
        if !c.ok() {
                return 0, nil, os.EINVAL
        }
        n, uaddr, err := c.ReadFromUDP(b)
        return n, uaddr.toAddr(), err
}
 
// WriteToUDP writes a UDP packet to addr via c, copying the payload from b.
//
// WriteToUDP can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetDeadline and SetWriteDeadline.
// On packet-oriented connections, write timeouts are rare.
func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (int, error) {
        if !c.ok() {
                return 0, os.EINVAL
        }
        if c.fd.isConnected {
                return 0, &OpError{"write", c.fd.net, addr, ErrWriteToConnected}
        }
        sa, err := addr.sockaddr(c.fd.family)
        if err != nil {
                return 0, &OpError{"write", c.fd.net, addr, err}
        }
        return c.fd.WriteTo(b, sa)
}
 
// WriteTo implements the PacketConn WriteTo method.
func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {
        if !c.ok() {
                return 0, os.EINVAL
        }
        a, ok := addr.(*UDPAddr)
        if !ok {
                return 0, &OpError{"write", c.fd.net, addr, os.EINVAL}
        }
        return c.WriteToUDP(b, a)
}
 
// File returns a copy of the underlying os.File, set to blocking mode.
// It is the caller's responsibility to close f when finished.
// Closing c does not affect f, and closing f does not affect c.
func (c *UDPConn) File() (f *os.File, err error) { return c.fd.dup() }
 
// DialUDP connects to the remote address raddr on the network net,
// which must be "udp", "udp4", or "udp6".  If laddr is not nil, it is used
// as the local address for the connection.
func DialUDP(net string, laddr, raddr *UDPAddr) (*UDPConn, error) {
        switch net {
        case "udp", "udp4", "udp6":
        default:
                return nil, UnknownNetworkError(net)
        }
        if raddr == nil {
                return nil, &OpError{"dial", net, nil, errMissingAddress}
        }
        fd, err := internetSocket(net, laddr.toAddr(), raddr.toAddr(), syscall.SOCK_DGRAM, 0, "dial", sockaddrToUDP)
        if err != nil {
                return nil, err
        }
        return newUDPConn(fd), nil
}
 
// ListenUDP listens for incoming UDP packets addressed to the
// local address laddr.  The returned connection c's ReadFrom
// and WriteTo methods can be used to receive and send UDP
// packets with per-packet addressing.
func ListenUDP(net string, laddr *UDPAddr) (*UDPConn, error) {
        switch net {
        case "udp", "udp4", "udp6":
        default:
                return nil, UnknownNetworkError(net)
        }
        if laddr == nil {
                return nil, &OpError{"listen", net, nil, errMissingAddress}
        }
        fd, err := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "listen", sockaddrToUDP)
        if err != nil {
                return nil, err
        }
        return newUDPConn(fd), nil
}
 
// ListenMulticastUDP listens for incoming multicast UDP packets
// addressed to the group address gaddr on ifi, which specifies
// the interface to join.  ListenMulticastUDP uses default
// multicast interface if ifi is nil.
func ListenMulticastUDP(net string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
        switch net {
        case "udp", "udp4", "udp6":
        default:
                return nil, UnknownNetworkError(net)
        }
        if gaddr == nil || gaddr.IP == nil {
                return nil, &OpError{"listenmulticastudp", "udp", nil, errMissingAddress}
        }
        fd, err := internetSocket(net, gaddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "listen", sockaddrToUDP)
        if err != nil {
                return nil, err
        }
        c := newUDPConn(fd)
        ip4 := gaddr.IP.To4()
        if ip4 != nil {
                err := listenIPv4MulticastUDP(c, ifi, ip4)
                if err != nil {
                        c.Close()
                        return nil, err
                }
        } else {
                err := listenIPv6MulticastUDP(c, ifi, gaddr.IP)
                if err != nil {
                        c.Close()
                        return nil, err
                }
        }
        return c, nil
}
 
func listenIPv4MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
        if ifi != nil {
                err := setIPv4MulticastInterface(c.fd, ifi)
                if err != nil {
                        return err
                }
        }
        err := setIPv4MulticastLoopback(c.fd, false)
        if err != nil {
                return err
        }
        err = joinIPv4GroupUDP(c, ifi, ip)
        if err != nil {
                return err
        }
        return nil
}
 
func listenIPv6MulticastUDP(c *UDPConn, ifi *Interface, ip IP) error {
        if ifi != nil {
                err := setIPv6MulticastInterface(c.fd, ifi)
                if err != nil {
                        return err
                }
        }
        err := setIPv6MulticastLoopback(c.fd, false)
        if err != nil {
                return err
        }
        err = joinIPv6GroupUDP(c, ifi, ip)
        if err != nil {
                return err
        }
        return nil
}
 
func joinIPv4GroupUDP(c *UDPConn, ifi *Interface, ip IP) error {
        err := joinIPv4Group(c.fd, ifi, ip)
        if err != nil {
                return &OpError{"joinipv4group", c.fd.net, &IPAddr{ip}, err}
        }
        return nil
}
 
func leaveIPv4GroupUDP(c *UDPConn, ifi *Interface, ip IP) error {
        err := leaveIPv4Group(c.fd, ifi, ip)
        if err != nil {
                return &OpError{"leaveipv4group", c.fd.net, &IPAddr{ip}, err}
        }
        return nil
}
 
func joinIPv6GroupUDP(c *UDPConn, ifi *Interface, ip IP) error {
        err := joinIPv6Group(c.fd, ifi, ip)
        if err != nil {
                return &OpError{"joinipv6group", c.fd.net, &IPAddr{ip}, err}
        }
        return nil
}
 
func leaveIPv6GroupUDP(c *UDPConn, ifi *Interface, ip IP) error {
        err := leaveIPv6Group(c.fd, ifi, ip)
        if err != nil {
                return &OpError{"leaveipv6group", c.fd.net, &IPAddr{ip}, err}
        }
        return nil
}

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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [net/] [udpsock_posix.go] - Blame information for rev 848

Line No.	Rev	Author	Line
1	747	jeremybenn	`// Copyright 2009 The Go Authors. All rights reserved.`
2			`// Use of this source code is governed by a BSD-style`
3			`// license that can be found in the LICENSE file.`
4
5			`// +build darwin freebsd linux netbsd openbsd windows`
6
7			`// UDP sockets`
8
9			`package net`
10
11			`import (`
12			`"errors"`
13			`"os"`
14			`"syscall"`
15			`"time"`
16			`)`
17
18			`var ErrWriteToConnected = errors.New("use of WriteTo with pre-connected UDP")`
19
20			`func sockaddrToUDP(sa syscall.Sockaddr) Addr {`
21			`switch sa := sa.(type) {`
22			`case *syscall.SockaddrInet4:`
23			`return &UDPAddr{sa.Addr[0:], sa.Port}`
24			`case *syscall.SockaddrInet6:`
25			`return &UDPAddr{sa.Addr[0:], sa.Port}`
26			`}`
27			`return nil`
28			`}`
29
30			`func (a *UDPAddr) family() int {`
31			`if a == nil \|\| len(a.IP) <= IPv4len {`
32			`return syscall.AF_INET`
33			`}`
34			`if a.IP.To4() != nil {`
35			`return syscall.AF_INET`
36			`}`
37			`return syscall.AF_INET6`
38			`}`
39
40			`func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {`
41			`return ipToSockaddr(family, a.IP, a.Port)`
42			`}`
43
44			`func (a *UDPAddr) toAddr() sockaddr {`
45			`if a == nil { // nil *UDPAddr`
46			`return nil // nil interface`
47			`}`
48			`return a`
49			`}`
50
51			`// UDPConn is the implementation of the Conn and PacketConn`
52			`// interfaces for UDP network connections.`
53			`type UDPConn struct {`
54			`fd *netFD`
55			`}`
56
57			`func newUDPConn(fd netFD) UDPConn { return &UDPConn{fd} }`
58
59			`func (c *UDPConn) ok() bool { return c != nil && c.fd != nil }`
60
61			`// Implementation of the Conn interface - see Conn for documentation.`
62
63			`// Read implements the Conn Read method.`
64			`func (c *UDPConn) Read(b []byte) (int, error) {`
65			`if !c.ok() {`
66			`return 0, os.EINVAL`
67			`}`
68			`return c.fd.Read(b)`
69			`}`
70
71			`// Write implements the Conn Write method.`
72			`func (c *UDPConn) Write(b []byte) (int, error) {`
73			`if !c.ok() {`
74			`return 0, os.EINVAL`
75			`}`
76			`return c.fd.Write(b)`
77			`}`
78
79			`// Close closes the UDP connection.`
80			`func (c *UDPConn) Close() error {`
81			`if !c.ok() {`
82			`return os.EINVAL`
83			`}`
84			`err := c.fd.Close()`
85			`c.fd = nil`
86			`return err`
87			`}`
88
89			`// LocalAddr returns the local network address.`
90			`func (c *UDPConn) LocalAddr() Addr {`
91			`if !c.ok() {`
92			`return nil`
93			`}`
94			`return c.fd.laddr`
95			`}`
96
97			`// RemoteAddr returns the remote network address, a *UDPAddr.`
98			`func (c *UDPConn) RemoteAddr() Addr {`
99			`if !c.ok() {`
100			`return nil`
101			`}`
102			`return c.fd.raddr`
103			`}`
104
105			`// SetDeadline implements the Conn SetDeadline method.`
106			`func (c *UDPConn) SetDeadline(t time.Time) error {`
107			`if !c.ok() {`
108			`return os.EINVAL`
109			`}`
110			`return setDeadline(c.fd, t)`
111			`}`
112
113			`// SetReadDeadline implements the Conn SetReadDeadline method.`
114			`func (c *UDPConn) SetReadDeadline(t time.Time) error {`
115			`if !c.ok() {`
116			`return os.EINVAL`
117			`}`
118			`return setReadDeadline(c.fd, t)`
119			`}`
120
121			`// SetWriteDeadline implements the Conn SetWriteDeadline method.`
122			`func (c *UDPConn) SetWriteDeadline(t time.Time) error {`
123			`if !c.ok() {`
124			`return os.EINVAL`
125			`}`
126			`return setWriteDeadline(c.fd, t)`
127			`}`
128
129			`// SetReadBuffer sets the size of the operating system's`
130			`// receive buffer associated with the connection.`
131			`func (c *UDPConn) SetReadBuffer(bytes int) error {`
132			`if !c.ok() {`
133			`return os.EINVAL`
134			`}`
135			`return setReadBuffer(c.fd, bytes)`
136			`}`
137
138			`// SetWriteBuffer sets the size of the operating system's`
139			`// transmit buffer associated with the connection.`
140			`func (c *UDPConn) SetWriteBuffer(bytes int) error {`
141			`if !c.ok() {`
142			`return os.EINVAL`
143			`}`
144			`return setWriteBuffer(c.fd, bytes)`
145			`}`
146
147			`// UDP-specific methods.`
148
149			`// ReadFromUDP reads a UDP packet from c, copying the payload into b.`
150			`// It returns the number of bytes copied into b and the return address`
151			`// that was on the packet.`
152			`//`
153			`// ReadFromUDP can be made to time out and return an error with Timeout() == true`
154			`// after a fixed time limit; see SetDeadline and SetReadDeadline.`
155			`func (c UDPConn) ReadFromUDP(b []byte) (n int, addr UDPAddr, err error) {`
156			`if !c.ok() {`
157			`return 0, nil, os.EINVAL`
158			`}`
159			`n, sa, err := c.fd.ReadFrom(b)`
160			`switch sa := sa.(type) {`
161			`case *syscall.SockaddrInet4:`
162			`addr = &UDPAddr{sa.Addr[0:], sa.Port}`
163			`case *syscall.SockaddrInet6:`
164			`addr = &UDPAddr{sa.Addr[0:], sa.Port}`
165			`}`
166			`return`
167			`}`
168
169			`// ReadFrom implements the PacketConn ReadFrom method.`
170			`func (c *UDPConn) ReadFrom(b []byte) (int, Addr, error) {`
171			`if !c.ok() {`
172			`return 0, nil, os.EINVAL`
173			`}`
174			`n, uaddr, err := c.ReadFromUDP(b)`
175			`return n, uaddr.toAddr(), err`
176			`}`
177
178			`// WriteToUDP writes a UDP packet to addr via c, copying the payload from b.`
179			`//`
180			`// WriteToUDP can be made to time out and return`
181			`// an error with Timeout() == true after a fixed time limit;`
182			`// see SetDeadline and SetWriteDeadline.`
183			`// On packet-oriented connections, write timeouts are rare.`
184			`func (c UDPConn) WriteToUDP(b []byte, addr UDPAddr) (int, error) {`
185			`if !c.ok() {`
186			`return 0, os.EINVAL`
187			`}`
188			`if c.fd.isConnected {`
189			`return 0, &OpError{"write", c.fd.net, addr, ErrWriteToConnected}`
190			`}`
191			`sa, err := addr.sockaddr(c.fd.family)`
192			`if err != nil {`
193			`return 0, &OpError{"write", c.fd.net, addr, err}`
194			`}`
195			`return c.fd.WriteTo(b, sa)`
196			`}`
197
198			`// WriteTo implements the PacketConn WriteTo method.`
199			`func (c *UDPConn) WriteTo(b []byte, addr Addr) (int, error) {`
200			`if !c.ok() {`
201			`return 0, os.EINVAL`
202			`}`
203			`a, ok := addr.(*UDPAddr)`
204			`if !ok {`
205			`return 0, &OpError{"write", c.fd.net, addr, os.EINVAL}`
206			`}`
207			`return c.WriteToUDP(b, a)`
208			`}`
209
210			`// File returns a copy of the underlying os.File, set to blocking mode.`
211			`// It is the caller's responsibility to close f when finished.`
212			`// Closing c does not affect f, and closing f does not affect c.`
213			`func (c UDPConn) File() (f os.File, err error) { return c.fd.dup() }`
214
215			`// DialUDP connects to the remote address raddr on the network net,`
216			`// which must be "udp", "udp4", or "udp6". If laddr is not nil, it is used`
217			`// as the local address for the connection.`
218			`func DialUDP(net string, laddr, raddr UDPAddr) (UDPConn, error) {`
219			`switch net {`
220			`case "udp", "udp4", "udp6":`
221			`default:`
222			`return nil, UnknownNetworkError(net)`
223			`}`
224			`if raddr == nil {`
225			`return nil, &OpError{"dial", net, nil, errMissingAddress}`
226			`}`
227			`fd, err := internetSocket(net, laddr.toAddr(), raddr.toAddr(), syscall.SOCK_DGRAM, 0, "dial", sockaddrToUDP)`
228			`if err != nil {`
229			`return nil, err`
230			`}`
231			`return newUDPConn(fd), nil`
232			`}`
233
234			`// ListenUDP listens for incoming UDP packets addressed to the`
235			`// local address laddr. The returned connection c's ReadFrom`
236			`// and WriteTo methods can be used to receive and send UDP`
237			`// packets with per-packet addressing.`
238			`func ListenUDP(net string, laddr UDPAddr) (UDPConn, error) {`
239			`switch net {`
240			`case "udp", "udp4", "udp6":`
241			`default:`
242			`return nil, UnknownNetworkError(net)`
243			`}`
244			`if laddr == nil {`
245			`return nil, &OpError{"listen", net, nil, errMissingAddress}`
246			`}`
247			`fd, err := internetSocket(net, laddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "listen", sockaddrToUDP)`
248			`if err != nil {`
249			`return nil, err`
250			`}`
251			`return newUDPConn(fd), nil`
252			`}`
253
254			`// ListenMulticastUDP listens for incoming multicast UDP packets`
255			`// addressed to the group address gaddr on ifi, which specifies`
256			`// the interface to join. ListenMulticastUDP uses default`
257			`// multicast interface if ifi is nil.`
258			`func ListenMulticastUDP(net string, ifi Interface, gaddr UDPAddr) (*UDPConn, error) {`
259			`switch net {`
260			`case "udp", "udp4", "udp6":`
261			`default:`
262			`return nil, UnknownNetworkError(net)`
263			`}`
264			`if gaddr == nil \|\| gaddr.IP == nil {`
265			`return nil, &OpError{"listenmulticastudp", "udp", nil, errMissingAddress}`
266			`}`
267			`fd, err := internetSocket(net, gaddr.toAddr(), nil, syscall.SOCK_DGRAM, 0, "listen", sockaddrToUDP)`
268			`if err != nil {`
269			`return nil, err`
270			`}`
271			`c := newUDPConn(fd)`
272			`ip4 := gaddr.IP.To4()`
273			`if ip4 != nil {`
274			`err := listenIPv4MulticastUDP(c, ifi, ip4)`
275			`if err != nil {`
276			`c.Close()`
277			`return nil, err`
278			`}`
279			`} else {`
280			`err := listenIPv6MulticastUDP(c, ifi, gaddr.IP)`
281			`if err != nil {`
282			`c.Close()`
283			`return nil, err`
284			`}`
285			`}`
286			`return c, nil`
287			`}`
288
289			`func listenIPv4MulticastUDP(c UDPConn, ifi Interface, ip IP) error {`
290			`if ifi != nil {`
291			`err := setIPv4MulticastInterface(c.fd, ifi)`
292			`if err != nil {`
293			`return err`
294			`}`
295			`}`
296			`err := setIPv4MulticastLoopback(c.fd, false)`
297			`if err != nil {`
298			`return err`
299			`}`
300			`err = joinIPv4GroupUDP(c, ifi, ip)`
301			`if err != nil {`
302			`return err`
303			`}`
304			`return nil`
305			`}`
306
307			`func listenIPv6MulticastUDP(c UDPConn, ifi Interface, ip IP) error {`
308			`if ifi != nil {`
309			`err := setIPv6MulticastInterface(c.fd, ifi)`
310			`if err != nil {`
311			`return err`
312			`}`
313			`}`
314			`err := setIPv6MulticastLoopback(c.fd, false)`
315			`if err != nil {`
316			`return err`
317			`}`
318			`err = joinIPv6GroupUDP(c, ifi, ip)`
319			`if err != nil {`
320			`return err`
321			`}`
322			`return nil`
323			`}`
324
325			`func joinIPv4GroupUDP(c UDPConn, ifi Interface, ip IP) error {`
326			`err := joinIPv4Group(c.fd, ifi, ip)`
327			`if err != nil {`
328			`return &OpError{"joinipv4group", c.fd.net, &IPAddr{ip}, err}`
329			`}`
330			`return nil`
331			`}`
332
333			`func leaveIPv4GroupUDP(c UDPConn, ifi Interface, ip IP) error {`
334			`err := leaveIPv4Group(c.fd, ifi, ip)`
335			`if err != nil {`
336			`return &OpError{"leaveipv4group", c.fd.net, &IPAddr{ip}, err}`
337			`}`
338			`return nil`
339			`}`
340
341			`func joinIPv6GroupUDP(c UDPConn, ifi Interface, ip IP) error {`
342			`err := joinIPv6Group(c.fd, ifi, ip)`
343			`if err != nil {`
344			`return &OpError{"joinipv6group", c.fd.net, &IPAddr{ip}, err}`
345			`}`
346			`return nil`
347			`}`
348
349			`func leaveIPv6GroupUDP(c UDPConn, ifi Interface, ip IP) error {`
350			`err := leaveIPv6Group(c.fd, ifi, ip)`
351			`if err != nil {`
352			`return &OpError{"leaveipv6group", c.fd.net, &IPAddr{ip}, err}`
353			`}`
354			`return nil`
355			`}`