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46ce80758d
In prep for reducing garbage, being able to reuse memory. So far this
doesn't actually reuse much. This is just changing signatures around.
But some improvement in any case:
bradfitz@tsdev:~/src/tailscale.com$ ~/go/bin/benchstat before after
name old time/op new time/op delta
GetList-8 11.8ms ± 9% 9.9ms ± 3% -15.98% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
GetList-8 99.5kB ± 2% 91.9kB ± 0% -7.62% (p=0.000 n=9+9)
name old allocs/op new allocs/op delta
GetList-8 3.05k ± 1% 2.93k ± 0% -3.83% (p=0.000 n=8+9)
More later, once parsers can reuse strings from previous parses.
Updates #5958
Change-Id: I76cd5048246dd24d11c4e263d8bb8041747fb2b0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
// Copyright (c) 2020 Tailscale Inc & 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 portlist
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import (
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"os/exec"
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"syscall"
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"time"
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"golang.org/x/sys/windows"
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)
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// Forking on Windows is insanely expensive, so don't do it too often.
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const pollInterval = 5 * time.Second
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func appendListeningPorts(base []Port) ([]Port, error) {
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// TODO(bradfitz): stop shelling out to netstat and use the
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// net/netstat package instead. When doing so, be sure to filter
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// out all of 127.0.0.0/8 and not just 127.0.0.1.
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return appendListeningPortsNetstat(base, "-na")
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}
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func addProcesses(pl []Port) ([]Port, error) {
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// OpenCurrentProcessToken instead of GetCurrentProcessToken,
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// as GetCurrentProcessToken only works on Windows 8+.
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tok, err := windows.OpenCurrentProcessToken()
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if err != nil {
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return nil, err
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}
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defer tok.Close()
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if !tok.IsElevated() {
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return appendListeningPortsNetstat(nil, "-na")
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}
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return appendListeningPortsNetstat(nil, "-nab")
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}
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func init() {
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osHideWindow = func(c *exec.Cmd) {
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c.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
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}
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}
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