From 090bb0ab414a3a6083192bf7ac45552f00b5995b Mon Sep 17 00:00:00 2001
From: artdeell <ultramaksim@gmail.com>
Date: Thu, 16 Jan 2025 21:55:38 +0300
Subject: [PATCH] Hack[jre_launcher]: raise SIGSEGV in abort handler to get
 backtrace

---
 app_pojavlauncher/src/main/jni/jre_launcher.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/app_pojavlauncher/src/main/jni/jre_launcher.c b/app_pojavlauncher/src/main/jni/jre_launcher.c
index 7ae251f923..722d1b8c17 100644
--- a/app_pojavlauncher/src/main/jni/jre_launcher.c
+++ b/app_pojavlauncher/src/main/jni/jre_launcher.c
@@ -82,8 +82,21 @@ _Noreturn static void* abort_waiter_thread(void* extraArg) {
     // Die
     nominal_exit(signal, true);
 }
+static bool signal_vm_first = true;
+
+// Writes a string constant into stdout in a signal-safe fashion
+#define PRINT_SIGSAFE(x) do { \
+const char msg[] = x;         \
+write(STDOUT_FILENO, msg, sizeof(msg));\
+} while(0)
 
 _Noreturn static void abort_waiter_handler(int signal) {
+    if(signal_vm_first) {
+        signal_vm_first = false;
+        // This is nasty and evil, but does work
+        PRINT_SIGSAFE("SIGABRT occured! Raising SIGSEGV to generate backtrace\n");
+        raise(SIGSEGV);
+    }
     // Write the final signal into the pipe and block forever.
     write(abort_waiter_data.pipe[1], &signal, sizeof(int));
     while(1) {}