mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-30 05:25:35 +00:00
45 lines
936 B
Go
45 lines
936 B
Go
|
// 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.
|
||
|
|
|
||
|
|
package filch
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"syscall"
|
||
|
|
)
|
||
|
|
|
||
|
|
var kernel32 = syscall.MustLoadDLL("kernel32.dll")
|
||
|
|
var procSetStdHandle = kernel32.MustFindProc("SetStdHandle")
|
||
|
|
|
||
|
|
func setStdHandle(stdHandle int32, handle syscall.Handle) error {
|
||
|
|
r, _, e := syscall.Syscall(procSetStdHandle.Addr(), 2, uintptr(stdHandle), uintptr(handle), 0)
|
||
|
|
if r == 0 {
|
||
|
|
if e != 0 {
|
||
|
|
return error(e)
|
||
|
|
}
|
||
|
|
return syscall.EINVAL
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func saveStderr() (*os.File, error) {
|
||
|
|
return os.Stderr, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func unsaveStderr(f *os.File) error {
|
||
|
|
os.Stderr = f
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func dup2Stderr(f *os.File) error {
|
||
|
|
fd := int(f.Fd())
|
||
|
|
err := setStdHandle(syscall.STD_ERROR_HANDLE, syscall.Handle(fd))
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("dup2Stderr: %w", err)
|
||
|
|
}
|
||
|
|
os.Stderr = f
|
||
|
|
return nil
|
||
|
|
}
|