Processing (Windows): redirect unused std handles to NUL to avoid potential errors

src/common/io/io_windows.c

@@ -175,7 +175,7 @@ bool ffSuppressIO(bool suppress)
     static bool init = false;
     static HANDLE hOrigOut = INVALID_HANDLE_VALUE;
     static HANDLE hOrigErr = INVALID_HANDLE_VALUE;
-    static HANDLE hNullFile = INVALID_HANDLE_VALUE;
+    HANDLE hNullFile = ffGetNullFD();
     static int fOrigOut = -1;
     static int fOrigErr = -1;
     static int fNullFile = -1;
@@ -187,7 +187,6 @@ bool ffSuppressIO(bool suppress)
 
         hOrigOut = GetStdHandle(STD_OUTPUT_HANDLE);
         hOrigErr = GetStdHandle(STD_ERROR_HANDLE);
-        hNullFile = CreateFileW(L"NUL", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, NULL);
         fOrigOut = _dup(STDOUT_FILENO);
         fOrigErr = _dup(STDERR_FILENO);
         fNullFile = _open_osfhandle((intptr_t) hNullFile, 0);
@@ -352,3 +351,23 @@ const char* ffGetTerminalResponse(const char* request, int nParams, const char*
 
     return NULL;
 }
+
+FFNativeFD ffGetNullFD(void)
+{
+    static FFNativeFD hNullFile = INVALID_HANDLE_VALUE;
+    if (hNullFile != INVALID_HANDLE_VALUE)
+        return hNullFile;
+    hNullFile = CreateFileW(
+        L"NUL",
+        GENERIC_READ | GENERIC_WRITE,
+        FILE_SHARE_WRITE,
+        0,
+        OPEN_EXISTING,
+        0,
+        &(SECURITY_ATTRIBUTES){
+            .nLength = sizeof(SECURITY_ATTRIBUTES),
+            .lpSecurityDescriptor = NULL,
+            .bInheritHandle = TRUE,
+        });
+    return hNullFile;
+}

src/common/processing_windows.c

@@ -81,7 +81,7 @@ const char* ffProcessAppendOutput(FFstrbuf* buffer, char* const argv[], bool use
     if (hChildPipeWrite == INVALID_HANDLE_VALUE)
         return "CreateFileW(L\"\\\\.\\pipe\\FASTFETCH-$(PID)\") failed";
 
-    PROCESS_INFORMATION piProcInfo = {0};
+    PROCESS_INFORMATION piProcInfo = {};
 
     BOOL success;
 
@@ -91,9 +91,15 @@ const char* ffProcessAppendOutput(FFstrbuf* buffer, char* const argv[], bool use
             .dwFlags = STARTF_USESTDHANDLES,
         };
         if (useStdErr)
+        {
+            siStartInfo.hStdOutput = ffGetNullFD();
             siStartInfo.hStdError = hChildPipeWrite;
+        }
         else
+        {
             siStartInfo.hStdOutput = hChildPipeWrite;
+            siStartInfo.hStdError = ffGetNullFD();
+        }
 
         FF_STRBUF_AUTO_DESTROY cmdline = ffStrbufCreate();
         argvToCmdline(argv, &cmdline);