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  }
    33
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