tailscale/logtail/filch/filch_unix.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !windows
// +build !windows
package filch
import (
"os"
"golang.org/x/sys/unix"
)
func saveStderr() (*os.File, error) {
fd, err := unix.Dup(stderrFD)
if err != nil {
return nil, err
}
return os.NewFile(uintptr(fd), "stderr"), nil
}
func unsaveStderr(f *os.File) error {
err := dup2Stderr(f)
f.Close()
return err
}
func dup2Stderr(f *os.File) error {
return unix.Dup2(int(f.Fd()), stderrFD)
}