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Exit as soon as possible on input grabbing error 

We want to know at once if slock failed or not to lock the screen, not
seing a black screen for a whole second (or two) and then die.
Thanks to ^7heo for reporting this.
This commit is contained in:
Quentin Rameau 2016-08-30 17:33:09 +02:00 committed by Markus Teich
parent 3bb868e408
commit c2f975773d
1 changed files with 21 additions and 25 deletions
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42
slock.c
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@ -222,7 +222,6 @@ static Lock *
lockscreen(Display *dpy, int screen)
{
char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
unsigned int len;
int i;
Lock *lock;
XColor color, dummy;
@ -249,34 +248,31 @@ lockscreen(Display *dpy, int screen)
lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
XDefineCursor(dpy, lock->win, invisible);
/* Try to grab mouse pointer *and* keyboard, else fail the lock */
if (XGrabPointer(dpy, lock->root, False, ButtonPressMask |
ButtonReleaseMask | PointerMotionMask, GrabModeAsync, GrabModeAsync,
None, invisible, CurrentTime) != GrabSuccess) {
fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
running = 0;
unlockscreen(dpy, lock);
return NULL;
}
if (XGrabKeyboard(dpy, lock->root, True, GrabModeAsync, GrabModeAsync,
CurrentTime) != GrabSuccess) {
fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
running = 0;
unlockscreen(dpy, lock);
return NULL;
}
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 (!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) {
/* 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);
}
/* grabbing one of the inputs failed */
running = 0;
unlockscreen(dpy, lock);
return NULL;
}
static void