From 3e4d110fd21271e1d2765fc7c47cbf0dc3d0f1b7 Mon Sep 17 00:00:00 2001
From: Jens Steube <jens.steube@gmail.com>
Date: Mon, 9 Mar 2020 20:05:23 +0100
Subject: [PATCH] Add stderr redirection the regular way

---
 src/backend.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/backend.c b/src/backend.c
index 7e7caee89..b020825e9 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -369,8 +369,26 @@ static bool opencl_test_instruction (hashcat_ctx_t *hashcat_ctx, cl_context cont
 
   OCL_PTR *ocl = (OCL_PTR *) backend_ctx->ocl;
 
+  const int fd_stderr = fileno (stderr);
+
+  #ifndef DEBUG
+  const int stderr_bak = dup (fd_stderr);
+  #ifdef _WIN
+  const int tmp = open ("NIL", O_WRONLY);
+  #else
+  const int tmp = open ("/dev/null", O_WRONLY);
+  #endif
+  dup2 (tmp, fd_stderr);
+  close (tmp);
+  #endif
+
   const int CL_rc = ocl->clBuildProgram (program, 1, &device, NULL, NULL, NULL);
 
+  #ifndef DEBUG
+  dup2 (stderr_bak, fd_stderr);
+  close (stderr_bak);
+  #endif
+
   if (CL_rc != CL_SUCCESS)
   {
     #if defined (DEBUG)