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error messages on grab failure

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This commit is contained in:
Markus Teich 2016-01-18 16:49:15 +01:00
parent 55e827af0f
commit 9dfe0ce531
1 changed files with 16 additions and 14 deletions
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30
slock.c
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@ -230,7 +230,7 @@ lockscreen(Display *dpy, int screen)
XSetWindowAttributes wa; XSetWindowAttributes wa;
Cursor invisible; Cursor invisible;
if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock)))) if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
return NULL; return NULL;
lock->screen = screen; lock->screen = screen;
@ -253,29 +253,31 @@ lockscreen(Display *dpy, int screen)
XMapRaised(dpy, lock->win); XMapRaised(dpy, lock->win);
if (rr) if (rr)
XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask); XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
/* Try to grab mouse pointer *and* keyboard, else fail the lock */
for (len = 1000; len; len--) { for (len = 1000; len; len--) {
if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask, if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess) GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break; break;
usleep(1000); usleep(1000);
} }
if (running && len) { if (!len) {
fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
} else {
for (len = 1000; len; len--) { for (len = 1000; len; len--) {
if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
break; /* everything fine, we grabbed both inputs */
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
return lock;
}
usleep(1000); usleep(1000);
} }
fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
} }
/* grabbing one of the inputs failed */
running &= (len > 0); running = 0;
if (!running) { unlockscreen(dpy, lock);
unlockscreen(dpy, lock); return NULL;
lock = NULL;
} else {
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
}
return lock;
} }
static void static void