tExit if we cannot grab the root window - glazier - window management experiments
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       ---
 (DIR) commit 6c9922fdef83195da197014b486bd6c6e8a0b4df
 (DIR) parent be1ea7423a1e2f0c0737f0489ba496cfc073b50b
 (HTM) Author: Willy Goiffon <dev@z3bra.org>
       Date:   Tue, 22 Oct 2019 18:42:08 +0200
       
       Exit if we cannot grab the root window
       
       Diffstat:
         M glazier.c                           |      11 +++++++++--
       
       1 file changed, 9 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/glazier.c b/glazier.c
       t@@ -449,6 +449,7 @@ ev_callback(xcb_generic_event_t *ev)
        int
        main (int argc, char *argv[])
        {
       +        int mask;
                char *argv0;
                xcb_generic_event_t *ev = NULL;
        
       t@@ -472,8 +473,14 @@ main (int argc, char *argv[])
                curwid = scrn->root;
        
                /* needed to get notified of windows creation */
       -        wm_reg_event(scrn->root, XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY
       -                | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT);
       +        mask = XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY
       +                | XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
       +
       +        if (wm_reg_event(scrn->root, mask) < 0) {
       +                if (verbose)
       +                        fprintf(stderr, "Cannot redirect root window event.\n");
       +                return -1;
       +        }
                xcb_flush(conn);
        
                for (;;) {