libgo/go/net/tcpsockopt_darwin.go

   1 // Copyright 2009 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 package net
   6
   7 import (
   8         "runtime"
   9         "syscall"
  10         "time"
  11 )
  12
  13 const sysTCP_KEEPINTVL = 0x101
  14
  15 func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  16         // The kernel expects seconds so round to next highest second.
  17         d += (time.Second - time.Nanosecond)
  18         secs := int(d.Seconds())
  19         switch err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs); err {
  20         case nil, syscall.ENOPROTOOPT: // OS X 10.7 and earlier don't support this option
  21         default:
  22                 return wrapSyscallError("setsockopt", err)
  23         }
  24         err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
  25         runtime.KeepAlive(fd)
  26         return wrapSyscallError("setsockopt", err)
  27 }