# SDL: Fixed process I/O redirection to NUL on Windows

**URL:** <https://discourse.libsdl.org/t/sdl-fixed-process-i-o-redirection-to-nul-on-windows/59193>\
**Category:** SDL Commits\
**Created:** [April 11, 2025, 10:45pm UTC](https://discourse.libsdl.org/t/sdl-fixed-process-i-o-redirection-to-nul-on-windows/59193 "2025-04-11T22:45:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![SDLPushPostBot](https://discourse.libsdl.org/user_avatar/discourse.libsdl.org/sdlpushpostbot/32/4370_2.png) [@SDLPushPostBot](https://discourse.libsdl.org/u/SDLPushPostBot)\
**Post date:** [April 11, 2025, 10:45pm UTC](https://discourse.libsdl.org/t/sdl-fixed-process-i-o-redirection-to-nul-on-windows/59193/1 "2025-04-11T22:45:08Z")

</div>

> <https://github.com/libsdl-org/SDL/commit/4093e4a193971ef1d4928158e0a1832be42e4599>

```diff
From 4093e4a193971ef1d4928158e0a1832be42e4599 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 11 Apr 2025 15:33:55 -0700
Subject: [PATCH] Fixed process I/O redirection to NUL on Windows

---
 src/process/windows/SDL_windowsprocess.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/process/windows/SDL_windowsprocess.c b/src/process/windows/SDL_windowsprocess.c
index 31e18f2412d12..3e0249ebd8140 100644
--- a/src/process/windows/SDL_windowsprocess.c
+++ b/src/process/windows/SDL_windowsprocess.c
@@ -339,7 +339,7 @@ bool SDL_SYS_CreateProcessWithProperties(SDL_Process *process, SDL_PropertiesID
         startup_info.hStdInput = stdin_pipe[READ_END];
         break;
     case SDL_PROCESS_STDIO_NULL:
- startup_info.hStdInput = CreateFile(TEXT("\\\\.\\NUL"), GENERIC_ALL, 0, &security_attributes, OPEN_EXISTING, 0, NULL);
+ startup_info.hStdInput = CreateFile(TEXT("\\\\.\\NUL"), (GENERIC_READ | GENERIC_WRITE), 0, &security_attributes, OPEN_EXISTING, 0, NULL);
         break;
     case SDL_PROCESS_STDIO_INHERITED:
     default:
@@ -376,7 +376,7 @@ bool SDL_SYS_CreateProcessWithProperties(SDL_Process *process, SDL_PropertiesID
         startup_info.hStdOutput = stdout_pipe[WRITE_END];
         break;
     case SDL_PROCESS_STDIO_NULL:
- startup_info.hStdOutput = CreateFile(TEXT("\\\\.\\NUL"), GENERIC_ALL, 0, &security_attributes, OPEN_EXISTING, 0, NULL);
+ startup_info.hStdOutput = CreateFile(TEXT("\\\\.\\NUL"), (GENERIC_READ | GENERIC_WRITE), 0, &security_attributes, OPEN_EXISTING, 0, NULL);
         break;
     case SDL_PROCESS_STDIO_INHERITED:
     default:
@@ -422,7 +422,7 @@ bool SDL_SYS_CreateProcessWithProperties(SDL_Process *process, SDL_PropertiesID
             startup_info.hStdError = stderr_pipe[WRITE_END];
             break;
         case SDL_PROCESS_STDIO_NULL:
- startup_info.hStdError = CreateFile(TEXT("\\\\.\\NUL"), GENERIC_ALL, 0, &security_attributes, OPEN_EXISTING, 0, NULL);
+ startup_info.hStdError = CreateFile(TEXT("\\\\.\\NUL"), (GENERIC_READ | GENERIC_WRITE), 0, &security_attributes, OPEN_EXISTING, 0, NULL);
             break;
         case SDL_PROCESS_STDIO_INHERITED:
         default:

```