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// socket_linux.go -- Socket handling specific to GNU/Linux.
// Copyright 2010 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 syscall
import "unsafe"
const SizeofSockaddrInet4 = 16
const SizeofSockaddrInet6 = 28
const SizeofSockaddrUnix = 110
const SizeofSockaddrLinklayer = 20
const SizeofSockaddrNetlink = 12
type SockaddrLinklayer struct {
Protocol uint16
Ifindex int
Hatype uint16
Pkttype uint8
Halen uint8
Addr [8]byte
raw RawSockaddrLinklayer
}
func (sa *SockaddrLinklayer) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
if sa.Ifindex < 0 || sa.Ifindex > 0x7fffffff {
return nil, 0, EINVAL
}
sa.raw.Family = AF_PACKET
sa.raw.Protocol = sa.Protocol
sa.raw.Ifindex = int32(sa.Ifindex)
sa.raw.Hatype = sa.Hatype
sa.raw.Pkttype = sa.Pkttype
sa.raw.Halen = sa.Halen
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), SizeofSockaddrLinklayer, nil
}
type SockaddrNetlink struct {
Family uint16
Pad uint16
Pid uint32
Groups uint32
raw RawSockaddrNetlink
}
func (sa *SockaddrNetlink) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
sa.raw.Family = AF_NETLINK
sa.raw.Pad = sa.Pad
sa.raw.Pid = sa.Pid
sa.raw.Groups = sa.Groups
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), SizeofSockaddrNetlink, nil
}
type RawSockaddrInet4 struct {
Family uint16
Port uint16
Addr [4]byte /* in_addr */
Zero [8]uint8
}
func (sa *RawSockaddrInet4) setLen() Socklen_t {
return SizeofSockaddrInet4
}
type RawSockaddrInet6 struct {
Family uint16
Port uint16
Flowinfo uint32
Addr [16]byte /* in6_addr */
Scope_id uint32
}
func (sa *RawSockaddrInet6) setLen() Socklen_t {
return SizeofSockaddrInet6
}
type RawSockaddrUnix struct {
Family uint16
Path [108]int8
}
func (sa *RawSockaddrUnix) setLen(int) {
}
func (sa *RawSockaddrUnix) getLen() (int, error) {
if sa.Path[0] == 0 {
// "Abstract" Unix domain socket.
// Rewrite leading NUL as @ for textual display.
// (This is the standard convention.)
// Not friendly to overwrite in place,
// but the callers below don't care.
sa.Path[0] = '@'
}
// Assume path ends at NUL.
// This is not technically the GNU/Linux semantics for
// abstract Unix domain sockets--they are supposed
// to be uninterpreted fixed-size binary blobs--but
// everyone uses this convention.
n := 0
for n < len(sa.Path) && sa.Path[n] != 0 {
n++
}
return n, nil
}
func (sa *RawSockaddrUnix) adjustAbstract(sl Socklen_t) Socklen_t {
if sa.Path[0] == '@' {
sa.Path[0] = 0
// Don't count trailing NUL for abstract address.
sl--
}
return sl
}
type RawSockaddrLinklayer struct {
Family uint16
Protocol uint16
Ifindex int32
Hatype uint16
Pkttype uint8
Halen uint8
Addr [8]uint8
}
type RawSockaddrNetlink struct {
Family uint16
Pad uint16
Pid uint32
Groups uint32
}
// BindToDevice binds the socket associated with fd to device.
func BindToDevice(fd int, device string) (err error) {
return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
}
func anyToSockaddrOS(rsa *RawSockaddrAny) (Sockaddr, error) {
switch rsa.Addr.Family {
case AF_NETLINK:
pp := (*RawSockaddrNetlink)(unsafe.Pointer(rsa))
sa := new(SockaddrNetlink)
sa.Family = pp.Family
sa.Pad = pp.Pad
sa.Pid = pp.Pid
sa.Groups = pp.Groups
return sa, nil
case AF_PACKET:
pp := (*RawSockaddrLinklayer)(unsafe.Pointer(rsa))
sa := new(SockaddrLinklayer)
sa.Protocol = pp.Protocol
sa.Ifindex = int(pp.Ifindex)
sa.Hatype = pp.Hatype
sa.Pkttype = pp.Pkttype
sa.Halen = pp.Halen
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
}
return nil, EAFNOSUPPORT
}
//sysnb EpollCreate(size int) (fd int, err error)
//epoll_create(size _C_int) _C_int
//sysnb EpollCreate1(flags int) (fd int, err error)
//epoll_create1(flags _C_int) _C_int
//sysnb EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
//epoll_ctl(epfd _C_int, op _C_int, fd _C_int, event *EpollEvent) _C_int
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
//epoll_wait(epfd _C_int, events *EpollEvent, maxevents _C_int, timeout _C_int) _C_int
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