github.com/d4l3k/go@v0.0.0-20151015000803-65fc379daeda/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  	"os"
    11  	"syscall"
    12  	"time"
    13  )
    14  
    15  func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
    16  	if err := fd.incref(); err != nil {
    17  		return err
    18  	}
    19  	defer fd.decref()
    20  	// The kernel expects seconds so round to next highest second.
    21  	d += (time.Second - time.Nanosecond)
    22  	secs := int(d.Seconds())
    23  	if err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs); err != nil {
    24  		return os.NewSyscallError("setsockopt", err)
    25  	}
    26  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPIDLE, secs))
    27  }