207c35fa9e
From-SVN: r180729
175 lines
3.9 KiB
Go
175 lines
3.9 KiB
Go
// socket_linux.go -- Socket handling specific to GNU/Linux.
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package syscall
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import "unsafe"
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const SizeofSockaddrInet4 = 16
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const SizeofSockaddrInet6 = 28
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const SizeofSockaddrUnix = 110
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const SizeofSockaddrLinklayer = 20
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const SizeofSockaddrNetlink = 12
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type SockaddrLinklayer struct {
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Protocol uint16
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Ifindex int
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Hatype uint16
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Pkttype uint8
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Halen uint8
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Addr [8]byte
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raw RawSockaddrLinklayer
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}
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func (sa *SockaddrLinklayer) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
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return nil, 0, EINVAL
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}
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sa.raw.Family = AF_PACKET
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sa.raw.Protocol = sa.Protocol
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sa.raw.Ifindex = int32(sa.Ifindex)
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sa.raw.Hatype = sa.Hatype
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sa.raw.Pkttype = sa.Pkttype
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sa.raw.Halen = sa.Halen
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for i := 0; i < len(sa.Addr); i++ {
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sa.raw.Addr[i] = sa.Addr[i]
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}
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return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), SizeofSockaddrLinklayer, 0
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}
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type SockaddrNetlink struct {
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Family uint16
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Pad uint16
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Pid uint32
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Groups uint32
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raw RawSockaddrNetlink
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}
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func (sa *SockaddrNetlink) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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sa.raw.Family = AF_NETLINK
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sa.raw.Pad = sa.Pad
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sa.raw.Pid = sa.Pid
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sa.raw.Groups = sa.Groups
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return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), SizeofSockaddrNetlink, 0
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}
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type RawSockaddrInet4 struct {
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Family uint16
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Port uint16
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Addr [4]byte /* in_addr */
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Zero [8]uint8
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}
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func (sa *RawSockaddrInet4) setLen() Socklen_t {
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return SizeofSockaddrInet4
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}
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type RawSockaddrInet6 struct {
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Family uint16
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Port uint16
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Flowinfo uint32
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Addr [16]byte /* in6_addr */
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Scope_id uint32
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}
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func (sa *RawSockaddrInet6) setLen() Socklen_t {
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return SizeofSockaddrInet6
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}
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type RawSockaddrUnix struct {
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Family uint16
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Path [108]int8
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}
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func (sa *RawSockaddrUnix) setLen(int) {
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}
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func (sa *RawSockaddrUnix) getLen() (int, int) {
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if sa.Path[0] == 0 {
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// "Abstract" Unix domain socket.
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// Rewrite leading NUL as @ for textual display.
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// (This is the standard convention.)
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// Not friendly to overwrite in place,
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// but the callers below don't care.
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sa.Path[0] = '@'
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}
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// Assume path ends at NUL.
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// This is not technically the GNU/Linux semantics for
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// abstract Unix domain sockets--they are supposed
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// to be uninterpreted fixed-size binary blobs--but
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// everyone uses this convention.
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n := 0
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for n < len(sa.Path) - 3 && sa.Path[n] != 0 {
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n++
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}
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return n, 0
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}
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type RawSockaddrLinklayer struct {
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Family uint16
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Protocol uint16
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Ifindex int32
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Hatype uint16
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Pkttype uint8
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Halen uint8
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Addr [8]uint8
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}
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type RawSockaddrNetlink struct {
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Family uint16
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Pad uint16
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Pid uint32
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Groups uint32
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}
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type RawSockaddr struct {
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Family uint16
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Data [14]int8
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}
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// BindToDevice binds the socket associated with fd to device.
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func BindToDevice(fd int, device string) (errno int) {
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return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
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}
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func anyToSockaddrOS(rsa *RawSockaddrAny) (Sockaddr, int) {
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switch rsa.Addr.Family {
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case AF_NETLINK:
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pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
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sa := new(SockaddrNetlink)
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sa.Family = pp.Family
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sa.Pad = pp.Pad
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sa.Pid = pp.Pid
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sa.Groups = pp.Groups
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return sa, 0
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case AF_PACKET:
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pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
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sa := new(SockaddrLinklayer)
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sa.Protocol = pp.Protocol
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sa.Ifindex = int(pp.Ifindex)
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sa.Hatype = pp.Hatype
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sa.Pkttype = pp.Pkttype
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sa.Halen = pp.Halen
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for i := 0; i < len(sa.Addr); i++ {
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sa.Addr[i] = pp.Addr[i]
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}
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return sa, 0
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}
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return nil, EAFNOSUPPORT
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}
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//sysnb EpollCreate(size int) (fd int, errno int)
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//epoll_create(size int) int
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//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (errno int)
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//epoll_ctl(epfd int, op int, fd int, event *EpollEvent) int
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//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, errno int)
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//epoll_wait(epfd int, events *EpollEvent, maxevents int, timeout int) int
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