github.com/likebike/go--@v0.0.0-20190911215757-0bd925d16e96/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  // +build freebsd linux netbsd
     6  
     7  package net
     8  
     9  import (
    10  	"runtime"
    11  	"syscall"
    12  	"time"
    13  )
    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, 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  }