wayland: Handle disconnect properly

Merge code for PollEvents and WaitEvents, and handle disconnect properly.

src/wl_window.c

@@ -114,6 +114,43 @@ createTmpfileCloexec(char* tmpname)
     return fd;
 }
 
+static void
+handleEvents(int timeout)
+{
+    struct wl_display* display = _glfw.wl.display;
+    struct pollfd fds[] = {
+        { wl_display_get_fd(display), POLLIN },
+    };
+
+    while (wl_display_prepare_read(display) != 0)
+        wl_display_dispatch_pending(display);
+
+    // If an error different from EAGAIN happens, we have likely been
+    // disconnected from the Wayland session, try to handle that the best we
+    // can.
+    if (wl_display_flush(display) < 0 && errno != EAGAIN)
+    {
+        _GLFWwindow* window = _glfw.windowListHead;
+        while (window)
+        {
+            _glfwInputWindowCloseRequest(window);
+            window = window->next;
+        }
+        wl_display_cancel_read(display);
+        return;
+    }
+
+    if (poll(fds, 1, timeout) > 0)
+    {
+        wl_display_read_events(display);
+        wl_display_dispatch_pending(display);
+    }
+    else
+    {
+        wl_display_cancel_read(display);
+    }
+}
+
 /*
  * Create a new, unique, anonymous file of the given size, and
  * return the file descriptor for it. The file descriptor is set
@@ -327,44 +364,12 @@ int _glfwPlatformWindowVisible(_GLFWwindow* window)
 
 void _glfwPlatformPollEvents(void)
 {
-    struct wl_display* display = _glfw.wl.display;
-    struct pollfd fds[] = {
-        { wl_display_get_fd(display), POLLIN },
-    };
-
-    while (wl_display_prepare_read(display) != 0)
-        wl_display_dispatch_pending(display);
-    wl_display_flush(display);
-    if (poll(fds, 1, 0) > 0)
-    {
-        wl_display_read_events(display);
-        wl_display_dispatch_pending(display);
-    }
-    else
-    {
-        wl_display_cancel_read(display);
-    }
+    handleEvents(0);
 }
 
 void _glfwPlatformWaitEvents(void)
 {
-    struct wl_display* display = _glfw.wl.display;
-    struct pollfd fds[] = {
-        { wl_display_get_fd(display), POLLIN },
-    };
-
-    while (wl_display_prepare_read(display) != 0)
-        wl_display_dispatch_pending(display);
-    wl_display_flush(display);
-    if (poll(fds, 1, -1) > 0)
-    {
-        wl_display_read_events(display);
-        wl_display_dispatch_pending(display);
-    }
-    else
-    {
-        wl_display_cancel_read(display);
-    }
+    handleEvents(-1);
 }
 
 void _glfwPlatformPostEmptyEvent(void)