1 // socket_linux.go -- Socket handling specific to GNU/Linux.
3 // Copyright 2010 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
11 const SizeofSockaddrInet4
= 16
12 const SizeofSockaddrInet6
= 28
13 const SizeofSockaddrUnix
= 110
14 const SizeofSockaddrLinklayer
= 20
15 const SizeofSockaddrNetlink
= 12
17 type SockaddrLinklayer
struct {
24 raw RawSockaddrLinklayer
27 func (sa
*SockaddrLinklayer
) sockaddr() (*RawSockaddrAny
, Socklen_t
, error
) {
28 if sa
.Ifindex
< 0 || sa
.Ifindex
> 0x7fffffff {
31 sa
.raw
.Family
= AF_PACKET
32 sa
.raw
.Protocol
= sa
.Protocol
33 sa
.raw
.Ifindex
= int32(sa
.Ifindex
)
34 sa
.raw
.Hatype
= sa
.Hatype
35 sa
.raw
.Pkttype
= sa
.Pkttype
36 sa
.raw
.Halen
= sa
.Halen
37 for i
:= 0; i
< len(sa
.Addr
); i
++ {
38 sa
.raw
.Addr
[i
] = sa
.Addr
[i
]
40 return (*RawSockaddrAny
)(unsafe
.Pointer(&sa
.raw
)), SizeofSockaddrLinklayer
, nil
43 type SockaddrNetlink
struct {
48 raw RawSockaddrNetlink
51 func (sa
*SockaddrNetlink
) sockaddr() (*RawSockaddrAny
, Socklen_t
, error
) {
52 sa
.raw
.Family
= AF_NETLINK
55 sa
.raw
.Groups
= sa
.Groups
56 return (*RawSockaddrAny
)(unsafe
.Pointer(&sa
.raw
)), SizeofSockaddrNetlink
, nil
59 type RawSockaddrInet4
struct {
62 Addr
[4]byte /* in_addr */
66 func (sa
*RawSockaddrInet4
) setLen() Socklen_t
{
67 return SizeofSockaddrInet4
70 type RawSockaddrInet6
struct {
74 Addr
[16]byte /* in6_addr */
78 func (sa
*RawSockaddrInet6
) setLen() Socklen_t
{
79 return SizeofSockaddrInet6
82 type RawSockaddrUnix
struct {
87 func (sa
*RawSockaddrUnix
) setLen(int) {
90 func (sa
*RawSockaddrUnix
) getLen() (int, error
) {
92 // "Abstract" Unix domain socket.
93 // Rewrite leading NUL as @ for textual display.
94 // (This is the standard convention.)
95 // Not friendly to overwrite in place,
96 // but the callers below don't care.
100 // Assume path ends at NUL.
101 // This is not technically the GNU/Linux semantics for
102 // abstract Unix domain sockets--they are supposed
103 // to be uninterpreted fixed-size binary blobs--but
104 // everyone uses this convention.
106 for n
< len(sa
.Path
) && sa
.Path
[n
] != 0 {
113 func (sa
*RawSockaddrUnix
) adjustAbstract(sl Socklen_t
) Socklen_t
{
114 if sa
.Path
[0] == '@' {
116 // Don't count trailing NUL for abstract address.
122 type RawSockaddrLinklayer
struct {
132 type RawSockaddrNetlink
struct {
139 type RawSockaddr
struct {
144 // BindToDevice binds the socket associated with fd to device.
145 func BindToDevice(fd
int, device
string) (err error
) {
146 return SetsockoptString(fd
, SOL_SOCKET
, SO_BINDTODEVICE
, device
)
149 func anyToSockaddrOS(rsa
*RawSockaddrAny
) (Sockaddr
, error
) {
150 switch rsa
.Addr
.Family
{
152 pp
:= (*RawSockaddrNetlink
)(unsafe
.Pointer(rsa
))
153 sa
:= new(SockaddrNetlink
)
154 sa
.Family
= pp
.Family
157 sa
.Groups
= pp
.Groups
161 pp
:= (*RawSockaddrLinklayer
)(unsafe
.Pointer(rsa
))
162 sa
:= new(SockaddrLinklayer
)
163 sa
.Protocol
= pp
.Protocol
164 sa
.Ifindex
= int(pp
.Ifindex
)
165 sa
.Hatype
= pp
.Hatype
166 sa
.Pkttype
= pp
.Pkttype
168 for i
:= 0; i
< len(sa
.Addr
); i
++ {
169 sa
.Addr
[i
] = pp
.Addr
[i
]
173 return nil, EAFNOSUPPORT
176 //sysnb EpollCreate(size int) (fd int, err error)
177 //epoll_create(size _C_int) _C_int
179 //sysnb EpollCreate1(flags int) (fd int, err error)
180 //epoll_create1(flags _C_int) _C_int
182 //sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
183 //epoll_ctl(epfd _C_int, op _C_int, fd _C_int, event *EpollEvent) _C_int
185 //sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
186 //epoll_wait(epfd _C_int, events *EpollEvent, maxevents _C_int, timeout _C_int) _C_int