github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/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  	"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  	if err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, msecs); err != nil {
    18  		return wrapSyscallError("setsockopt", err)
    19  	}
    20  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, msecs)
    21  	runtime.KeepAlive(fd)
    22  	return wrapSyscallError("setsockopt", err)
    23  }