libgo/go/net/tcpsockopt_solaris.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 package net
   6
   7 import (
   8         "runtime"
   9         "syscall"
  10         "time"
  11 )
  12
  13 func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  14         // The kernel expects milliseconds so round to next highest
  15         // millisecond.
  16         msecs := int(roundDurationUp(d, time.Millisecond))
  17
  18         // Normally we'd do
  19         //      syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs)
  20         // here, but we can't because Solaris does not have TCP_KEEPINTVL.
  21         // Solaris has TCP_KEEPALIVE_ABORT_THRESHOLD, but it's not the same
  22         // thing, it refers to the total time until aborting (not between
  23         // probes), and it uses an exponential backoff algorithm instead of
  24         // waiting the same time between probes. We can't hope for the best
  25         // and do it anyway, like on Darwin, because Solaris might eventually
  26         // allocate a constant with a different meaning for the value of
  27         // TCP_KEEPINTVL on illumos.
  28
  29         err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_THRESHOLD, msecs)
  30         runtime.KeepAlive(fd)
  31         return wrapSyscallError("setsockopt", err)
  32 }