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slock
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error messages on grab failure

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;
Cursor invisible;
if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
if (!running || dpy == NULL || screen < 0 || !(lock = malloc(sizeof(Lock))))
return NULL;
lock->screen = screen;
@ -253,29 +253,31 @@ lockscreen(Display *dpy, int screen)
XMapRaised(dpy, lock->win);
if (rr)
XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
/* Try to grab mouse pointer *and* keyboard, else fail the lock */
for (len = 1000; len; len--) {
if (XGrabPointer(dpy, lock->root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
break;
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--) {
if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
break;
if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess) {
/* everything fine, we grabbed both inputs */
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
return lock;
}
usleep(1000);
}
fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
}
running &= (len > 0);
if (!running) {
unlockscreen(dpy, lock);
lock = NULL;
} else {
XSelectInput(dpy, lock->root, SubstructureNotifyMask);
}
return lock;
/* grabbing one of the inputs failed */
running = 0;
unlockscreen(dpy, lock);
return NULL;
}
static void