libgo/syscalls/socket_linux.go

   1 // socket_linux.go -- Socket handling specific to Linux.
   2
   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.
   6
   7 package syscall
   8
   9 const SizeofSockaddrInet4 = 16
  10 const SizeofSockaddrInet6 = 28
  11 const SizeofSockaddrUnix = 110
  12
  13 type RawSockaddrInet4 struct {
  14         Family uint16;
  15         Port uint16;
  16         Addr [4]byte /* in_addr */;
  17         Zero [8]uint8;
  18 }
  19
  20 func (sa *RawSockaddrInet4) setLen() Socklen_t {
  21         return SizeofSockaddrInet4
  22 }
  23
  24 type RawSockaddrInet6 struct {
  25         Family uint16;
  26         Port uint16;
  27         Flowinfo uint32;
  28         Addr [16]byte /* in6_addr */;
  29         Scope_id uint32;
  30 }
  31
  32 func (sa *RawSockaddrInet6) setLen() Socklen_t {
  33         return SizeofSockaddrInet6
  34 }
  35
  36 type RawSockaddrUnix struct {
  37         Family uint16;
  38         Path [108]int8;
  39 }
  40
  41 func (sa *RawSockaddrUnix) setLen(int) {
  42 }
  43
  44 func (sa *RawSockaddrUnix) getLen() (int, int) {
  45         if sa.Path[0] == 0 {
  46                 // "Abstract" Unix domain socket.
  47                 // Rewrite leading NUL as @ for textual display.
  48                 // (This is the standard convention.)
  49                 // Not friendly to overwrite in place,
  50                 // but the callers below don't care.
  51                 sa.Path[0] = '@';
  52         }
  53
  54         // Assume path ends at NUL.
  55         // This is not technically the Linux semantics for
  56         // abstract Unix domain sockets--they are supposed
  57         // to be uninterpreted fixed-size binary blobs--but
  58         // everyone uses this convention.
  59         n := 0;
  60         for n < len(sa.Path) - 3 && sa.Path[n] != 0 {
  61                 n++;
  62         }
  63
  64         return n, 0
  65 }
  66
  67 type RawSockaddr struct {
  68         Family uint16;
  69         Data [14]int8;
  70 }
  71
  72 // BindToDevice binds the socket associated with fd to device.
  73 func BindToDevice(fd int, device string) (errno int) {
  74         return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
  75 }