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