github.com/hikaru7719/go@v0.0.0-20181025140707-c8b2ac68906a/src/net/tcpsockopt_darwin.go (about)

     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  	if err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs); err != nil {
    20  		return wrapSyscallError("setsockopt", err)
    21  	}
    22  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
    23  	runtime.KeepAlive(fd)
    24  	return wrapSyscallError("setsockopt", err)
    25  }