[PATCH] Fix unresponsive SDL GUI by handling SDL_QUIT events

[alaanourali@gmail.com]

From: Alaa Ali <alaanourali@gmail.com>

The SDL GUI in the scanout function can appear unresponsive to the
operating system, as it lacks an event handler. This patch adds a
new function, handle_sdl_events(), which processes SDL events to
ensure the window can respond to close requests.

This addresses issues where Linux might think the SDL window is
unresponsive, allowing it to handle SDL_QUIT events properly and
initiate shutdown.

Signed-off-by: Alaa Ali <alaanourali@gmail.com>
---
 arch/sandbox/os/sdl.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/sandbox/os/sdl.c b/arch/sandbox/os/sdl.c
index 13178abfc0..0fc281b7b8 100644
--- a/arch/sandbox/os/sdl.c
+++ b/arch/sandbox/os/sdl.c
@@ -13,6 +13,15 @@ static void sdl_perror(const char *what)
 	printf("SDL: Could not %s: %s.\n", what, SDL_GetError());
 }
 
+static void handle_sdl_events(void)
+{
+    SDL_Event event;
+    while (SDL_PollEvent(&event)) {
+        if (event.type == SDL_QUIT)
+        	SDL_AtomicSet(&shutdown, true);
+    }
+}
+
 static struct sdl_fb_info info;
 static SDL_atomic_t shutdown;
 SDL_Window *window;
@@ -47,6 +56,7 @@ static int scanout(void *ptr)
 	while (!SDL_AtomicGet(&shutdown)) {
 		SDL_Delay(100);
 
+		handle_sdl_events();  /* Handle events like window close */
 		SDL_UpdateTexture(texture, NULL, buf, surface->pitch);
 		SDL_RenderClear(renderer);
 		SDL_RenderCopy(renderer, texture, NULL, NULL);
-- 
2.43.0