github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/net/tcpsockopt_darwin.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  const sysTCP_KEEPINTVL = 0x101
    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  	switch err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs); err {
    24  	case nil, syscall.ENOPROTOOPT: // OS X 10.7 and earlier don't support this option
    25  	default:
    26  		return os.NewSyscallError("setsockopt", err)
    27  	}
    28  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs))
    29  }