download_windows.go

     1  // Copyright 2024 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build windows
     6  
     7  package configstore
     8  
     9  import (
    10  	"os/exec"
    11  	"syscall"
    12  
    13  	"golang.org/x/sys/windows"
    14  )
    15  
    16  func init() {
    17  	needNoConsole = needNoConsoleWindows
    18  }
    19  
    20  func needNoConsoleWindows(cmd *exec.Cmd) {
    21  	// The uploader main process is likely a daemonized process with no console.
    22  	// (see x/telemetry/start_windows.go) The console creation behavior when
    23  	// a parent is a console process without console is not clearly documented
    24  	// but empirically we observed the new console is created and attached to the
    25  	// subprocess in the default setup.
    26  	//
    27  	// Ensure no new console is attached to the subprocess by setting CREATE_NO_WINDOW.
    28  	//   https://learn.microsoft.com/en-us/windows/console/creation-of-a-console
    29  	//   https://learn.microsoft.com/en-us/windows/win32/procthread/process-creation-flags
    30  	cmd.SysProcAttr = &syscall.SysProcAttr{
    31  		CreationFlags: windows.CREATE_NO_WINDOW,
    32  	}
    33  }
    34
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