mod: reset non-blocking reading of stdin when quitting

src/app.zig

@@ -145,6 +145,16 @@ pub fn App(comptime M: type, comptime E: type) type {
                 future.cancel(this.io) catch {};
                 this.future = null;
             }
+            // reset stdin nonblocking reading
+            {
+                // Step 1: Get current flags
+                var fl_flags = posix.system.fcntl(posix.STDIN_FILENO, posix.F.GETFL, 0);
+                // Step 2: Remove O_NONBLOCK
+                fl_flags ^= 1 << @bitOffsetOf(posix.system.O, "NONBLOCK");
+                std.log.debug("end fl_flags: {any}", .{fl_flags});
+                // Step 3: Set new flags
+                _ = posix.system.fcntl(posix.STDIN_FILENO, posix.F.SETFL, fl_flags);
+            }
         }
 
         /// Quit the application loop.
@@ -175,7 +185,9 @@ pub fn App(comptime M: type, comptime E: type) type {
             {
                 // TODO is there a better way to do this through the `std.Io` interface?
                 var fl_flags = posix.system.fcntl(posix.STDIN_FILENO, posix.F.GETFL, 0);
+                std.log.debug("start fl_flags: {any}", .{fl_flags});
                 fl_flags |= 1 << @bitOffsetOf(posix.system.O, "NONBLOCK");
+                std.log.debug("setting of fl_flags: {any}", .{fl_flags});
                 _ = posix.system.fcntl(posix.STDIN_FILENO, posix.F.SETFL, fl_flags);
             }