From 48a09b10be84880b3d6e9d53687d40f521d7deca Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Mon, 3 Aug 2026 20:02:30 +0300
Subject: [PATCH] update platform::new_engine_instance

---
 src/logic/scripting/lua/libs/libapp.cpp | 9 ++++-----
 src/util/platform.cpp                   | 9 +++++++--
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/logic/scripting/lua/libs/libapp.cpp b/src/logic/scripting/lua/libs/libapp.cpp
index 9157b33a6..4885915ad 100644
--- a/src/logic/scripting/lua/libs/libapp.cpp
+++ b/src/logic/scripting/lua/libs/libapp.cpp
@@ -403,6 +403,7 @@ static int l_start_background_instance(lua::State* L) {
         "--script", io::resolve(scriptPath).u8string(),
         "--sub-depth", std::to_string(engine->getCoreParameters()
             .subProcessDepth + 1),
+        "--log", io::resolve(outputPath),
     };
     args.emplace_back("--project");
     args.emplace_back(io::resolve(engine->getProject().path).u8string());
@@ -417,11 +418,9 @@ static int l_start_background_instance(lua::State* L) {
     if (handle == -1) {
         throw std::runtime_error("sub-processes limit exceeded");
     }
-    ::processes[handle] = platform::new_engine_instance(
-        std::move(args),
-        outputPath.empty() ? "" : io::resolve(outputPath),
-        true 
-    );
+    ::processes[handle] =
+        platform::new_engine_instance(std::move(args), "", true);
+
     return lua::pushinteger(L, handle);
 }
 
diff --git a/src/util/platform.cpp b/src/util/platform.cpp
index 7b08639e9..c7b945510 100644
--- a/src/util/platform.cpp
+++ b/src/util/platform.cpp
@@ -28,6 +28,8 @@
     #include <sys/wait.h>
 #endif
 
+using namespace std::literals;
+
 namespace platform::internal {
     std::filesystem::path get_executable_path();
 }
@@ -356,7 +358,7 @@ std::unique_ptr<Process> platform::new_engine_instance(
     if (!outputFile.empty()) {
         si.dwFlags |= STARTF_USESTDHANDLES;
         si.hStdOutput = CreateFileW(
-            toWString(outputFile.u8string()).data(),
+            toWString(outputFile.empty() ? outputFile.u8string() : "NUL"s,).data(),
             GENERIC_WRITE,
             FILE_SHARE_WRITE | FILE_SHARE_READ,
             nullptr,
@@ -434,9 +436,12 @@ std::unique_ptr<Process> platform::new_engine_instance(
     if (subProcess) {
         pid_t pid = fork();
 
+        if (outputFile.empty()) {
+            outputFile = "/dev/null";
+        }
         int fd = open(
             outputFile.string().c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0644
-        );
+        ); 
 
         if (pid == 0) {
             prctl(PR_SET_PDEATHSIG, SIGTERM);