1 // Copyright 2015 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 func setKeepAlivePeriod(fd *netFD, d time.Duration) error { 14 if err := fd.incref(); err != nil { 15 return err 16 } 17 defer fd.decref() 18 // The kernel expects milliseconds so round to next highest 19 // millisecond. 20 d += (time.Millisecond - time.Nanosecond) 21 msecs := int(d / time.Millisecond) 22 23 // Normally we'd do 24 // syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs) 25 // here, but we can't because Solaris does not have TCP_KEEPINTVL. 26 // Solaris has TCP_KEEPALIVE_ABORT_THRESHOLD, but it's not the same 27 // thing, it refers to the total time until aborting (not between 28 // probes), and it uses an exponential backoff algorithm instead of 29 // waiting the same time between probes. We can't hope for the best 30 // and do it anyway, like on Darwin, because Solaris might eventually 31 // allocate a constant with a different meaning for the value of 32 // TCP_KEEPINTVL on illumos. 33 34 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_THRESHOLD, msecs)) 35 } 36
