github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/net/tcpsockopt_unix.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  //go:build aix || freebsd || linux || netbsd
     6  // +build aix freebsd linux netbsd
     7  
     8  package net
     9  
    10  import (
    11  	"runtime"
    12  	"syscall"
    13  	"time"
    14  )
    15  
    16  func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
    17  	// The kernel expects seconds so round to next highest second.
    18  	secs := int(roundDurationUp(d, time.Second))
    19  	if err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs); err != nil {
    20  		return wrapSyscallError("setsockopt", err)
    21  	}
    22  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, secs)
    23  	runtime.KeepAlive(fd)
    24  	return wrapSyscallError("setsockopt", err)
    25  }