// Copyright 2015 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net import ( "runtime" "syscall" "time" ) func setKeepAlivePeriod(fd *netFD, d time.Duration) error { // The kernel expects milliseconds so round to next highest // millisecond. msecs := int(roundDurationUp(d, time.Millisecond)) // Normally we'd do // syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs) // here, but we can't because Solaris does not have TCP_KEEPINTVL. // Solaris has TCP_KEEPALIVE_ABORT_THRESHOLD, but it's not the same // thing, it refers to the total time until aborting (not between // probes), and it uses an exponential backoff algorithm instead of // waiting the same time between probes. We can't hope for the best // and do it anyway, like on Darwin, because Solaris might eventually // allocate a constant with a different meaning for the value of // TCP_KEEPINTVL on illumos. err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE_THRESHOLD, msecs) runtime.KeepAlive(fd) return wrapSyscallError("setsockopt", err) }