From 5e041e6e5a527e501f76ca1d527edb89e9719017 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Wed, 13 Nov 2024 17:32:13 +0200
Subject: [PATCH] WindowServer: Make all terminating signals exit cleanly

This allows window server to restore input handling to TTY if window
server crashes on page fault or some other unexpected exception.
---
 userspace/programs/WindowServer/main.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/userspace/programs/WindowServer/main.cpp b/userspace/programs/WindowServer/main.cpp
index ca334cd9..34f8e711 100644
--- a/userspace/programs/WindowServer/main.cpp
+++ b/userspace/programs/WindowServer/main.cpp
@@ -165,6 +165,19 @@ int main()
 
 	atexit([]() { tty_ctrl(STDIN_FILENO, TTY_CMD_SET, TTY_FLAG_ENABLE_INPUT); });
 
+	constexpr int non_terminating_signals[] {
+		SIGCHLD,
+		SIGCONT,
+		SIGSTOP,
+		SIGTSTP,
+		SIGTTIN,
+		SIGTTOU,
+	};
+	for (int sig = _SIGMIN; sig <= _SIGMAX; sig++)
+		signal(sig, exit);
+	for (int sig : non_terminating_signals)
+		signal(sig, SIG_DFL);
+
 	MUST(LibInput::KeyboardLayout::initialize());
 	MUST(LibInput::KeyboardLayout::get().load_from_file("/usr/share/keymaps/us.keymap"_sv));