github.com/roboticscm/goman@v0.0.0-20210203095141-87c07b4a0a55/src/net/tcpsockopt_dragonfly.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  	"os"
     9  	"syscall"
    10  	"time"
    11  )
    12  
    13  func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
    14  	if err := fd.incref(); err != nil {
    15  		return err
    16  	}
    17  	defer fd.decref()
    18  	// The kernel expects milliseconds so round to next highest
    19  	// millisecond.
    20  	d += (time.Millisecond - time.Nanosecond)
    21  	msecs := int(d / time.Millisecond)
    22  	if err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, msecs); err != nil {
    23  		return os.NewSyscallError("setsockopt", err)
    24  	}
    25  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, msecs))
    26  }