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 "runtime" 9 "syscall" 10 "time" 11 ) 12 13 const sysTCP_KEEPINTVL = 0x101 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 switch err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs); err { 20 case nil, syscall.ENOPROTOOPT: // OS X 10.7 and earlier don't support this option 21 default: 22 return wrapSyscallError("setsockopt", err) 23 } 24 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs) 25 runtime.KeepAlive(fd) 26 return wrapSyscallError("setsockopt", err) 27 } 28
