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- // 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)
- }
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