From a803ba931e74e6f99a478584e1280626c0c880e3 Mon Sep 17 00:00:00 2001 From: Michael Stapelberg Date: Mon, 24 Oct 2011 21:18:43 +0100 Subject: [PATCH] =?utf8?q?Bugfix:=20Don=E2=80=99t=20re-grab=20pointer/keyb?= =?utf8?q?oard=20on=20MappingNotify=20(Thanks=20wilmer)?= MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This fixes bug http://bugs.i3wm.org/545, where characters (of your password) would rarely slip through when entering your password (especially) after resuming your notebook from suspend to RAM. The reason is that when resuming, X triggers one or more MappingNotify events. At the same time, CPU load is high. This leads to a race-condition between the ungrab and re-grab in which i3lock temporarily does not grab the keyboard. One way to fix this is using xcb_grab_server() before and xcb_ungrab_server() after the ungrab/re-grab. However, I think we actually don’t need to ungrab/re-grab at all. I seem to have put that code in here by mistake – in i3, we re-grab after MappingNotify, but there we only grab specific keys. In i3lock, we grab the whole pointer/keyboard, so there should be no need. If I’m incorrect and this breaks some subtle use-cases for people with strange layout setup, at least we can properly document on why we need it, after we put it back in ;). --- i3lock.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/i3lock.c b/i3lock.c index 3332f83..55cedba 100644 --- a/i3lock.c +++ b/i3lock.c @@ -231,21 +231,14 @@ static void handle_visibility_notify(xcb_visibility_notify_event_t *event) { } /* - * Called when the keyboard mapping changes. We update our symbols and re-grab - * pointer/keyboard. + * Called when the keyboard mapping changes. We update our symbols. * */ static void handle_mapping_notify(xcb_mapping_notify_event_t *event) { xcb_refresh_keyboard_mapping(symbols, event); - xcb_ungrab_pointer(conn, XCB_CURRENT_TIME); - xcb_ungrab_keyboard(conn, XCB_CURRENT_TIME); - grab_pointer_and_keyboard(conn, scr, cursor); - modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch); numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock); - - xcb_flush(conn); } /* -- 2.39.5