mirror of
https://github.com/tailscale/tailscale.git
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45 lines
936 B
Go
45 lines
936 B
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 filch
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import (
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"fmt"
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"os"
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"syscall"
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)
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var kernel32 = syscall.MustLoadDLL("kernel32.dll")
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var procSetStdHandle = kernel32.MustFindProc("SetStdHandle")
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func setStdHandle(stdHandle int32, handle syscall.Handle) error {
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r, _, e := syscall.Syscall(procSetStdHandle.Addr(), 2, uintptr(stdHandle), uintptr(handle), 0)
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if r == 0 {
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if e != 0 {
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return error(e)
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}
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return syscall.EINVAL
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}
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return nil
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}
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func saveStderr() (*os.File, error) {
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return os.Stderr, nil
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}
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func unsaveStderr(f *os.File) error {
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os.Stderr = f
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return nil
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}
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func dup2Stderr(f *os.File) error {
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fd := int(f.Fd())
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err := setStdHandle(syscall.STD_ERROR_HANDLE, syscall.Handle(fd))
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if err != nil {
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return fmt.Errorf("dup2Stderr: %w", err)
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}
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os.Stderr = f
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return nil
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}
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