libgo/go/net/cgo_resold.go

   1 // Copyright 2015 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 cgo,!netgo
   6 // +build android freebsd dragonfly openbsd
   7
   8 package net
   9
  10 /*
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13
  14 #include <netdb.h>
  15 */
  16
  17 import (
  18         "syscall"
  19 )
  20
  21 //extern getnameinfo
  22 func libc_getnameinfo(*syscall.RawSockaddr, syscall.Socklen_t, *byte, syscall.Size_t, *byte, syscall.Size_t, int) int
  23
  24 func cgoNameinfoPTR(b []byte, sa *syscall.RawSockaddr, salen syscall.Socklen_t) (int, error) {
  25         syscall.Entersyscall()
  26         gerrno := libc_getnameinfo(sa, salen, &b[0], syscall.Size(len(b)), nil, 0, syscall.NI_NAMEREQD)
  27         syscall.Exitsyscall()
  28         var err error
  29         if gerrno == syscall.EAI_SYSTEM {
  30                 errno := syscall.GetErrno()
  31                 if errno != 0 {
  32                         err = errno
  33                 }
  34         }
  35         return gerrno, err
  36 }