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 "runtime" 9 "syscall" 10 "time" 11 ) 12 13 func setKeepAlivePeriod(fd *netFD, d time.Duration) error { 14 // The kernel expects milliseconds so round to next highest 15 // millisecond. 16 d += (time.Millisecond - time.Nanosecond) 17 msecs := int(d / time.Millisecond) 18 19 // Normally we'd do 20 // syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs) 21 // here, but we can't because Solaris does not have TCP_KEEPINTVL. 22 // Solaris has TCP_KEEPALIVE_ABORT_THRESHOLD, but it's not the same 23 // thing, it refers to the total time until aborting (not between 24 // probes), and it uses an exponential backoff algorithm instead of 25 // waiting the same time between probes. We can't hope for the best 26 // and do it anyway, like on Darwin, because Solaris might eventually 27 // allocate a constant with a different meaning for the value of 28 // TCP_KEEPINTVL on illumos. 29 30 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_THRESHOLD, msecs) 31 runtime.KeepAlive(fd) 32 return wrapSyscallError("setsockopt", err) 33 } 34