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 } 30
