Also add flag for number of seconds to wait for it.

When user cancels the password or enters a wrong one, i3lock will wait
for some time before putting the monitors back to sleep. By default it's
30 seconds, but this flag allows to control that.

As described in ticket #1114, the screen may be left turned off on successful
authentication. This commit fixes this behaviour by turning the screen back on
after the authentication.

Fixes #1114

This is cleaner than commit a305e62 (running authentication in a
separate process) because we don’t lose the feature that X11 will buffer
KeyPresses for us while the process blocks on PAM. See
http://cr.i3wm.org/patch/305 for the amount of code (and new known bugs)
that would have to be introduced to make a305e62 work.

This reverts commit a305e622a6.

In the next commit, the same functionality will be achieved in a cleaner
way.

This reverts commit 33d953fbdf,
in preparation for reverting commit a305e62

clear_input() calls start_clear_indicator_timeout() to clear the
indicator after 1 second. This had as a result the screen to be cleared
when the "verifying…" message was showed, so the "wrong!" message didn't
show up when the password was wrong.

First bad commit: a305e62

When having i3bar in “hide” mode, it could previously be brought up
while the authentication was running. This is not 100% fixed with this
change, but a lot better, as the normal “raise i3lock to the top”
behavior is not blocked now anymore.

fixes #895

This should make the numpad work correctly.

When the XF86ScreenSaver key is used to put a laptop to sleep (or to
trigger the screensaver), the key may "bounce" on resume. This is
annoying as i3lock will try to validate several empty passwords and
wait several seconds before accepting a legit password.

Some users may want to validate an empty password: PAM may rely on
other sources to unlock the screen, like the presence of a token or
the proximity of some Bluetooth device. Hence, we don't forbid this
possibility and provide an command-line option for users not willing
to validate empty passwords.

This has been broken by commit 661344.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>

Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>

This keysym is generated on convertible tablets by pressing a hardware
lock/unlock button.

Thanks to Ran Benita and Daniel Stone (the libxkbcommon authors) for
answering my questions and reviewing this code.

With this commit, input handling should be more correct with using less
code (in i3lock, that is).

The previous code didn’t cause any issues since both types (currently!)
have the same size.

On ARM, casting -1 to char turns it into something else. Fixes
argument parsing on ARM. Thanks Chipaca for reporting.

With some layouts, this broke uppercase letters in your passwords.

I think that explicit shiftlock handling is unnecessary. X11 seems to do
it on its own. Here is what leads me to that conclusion:

  $ setxkbmap de
  $ xmodmap -e 'keycode 66 = Shift_Lock'
  $ xev

Now enter a character, say "a", then press CapsLk (which is now
Shift_Lock), then press "a" again. The event state is 0x1, thereby
undistinguishable from normal shift.

Fixes: #712

See also:
http://article.gmane.org/gmane.linux.kernel/1268792

The C compiler will handle (void) as "no arguments" and () as "variadic
function" (equivalent to (...)) which might lead to subtle errors, such
as the one which was fixed with commit 0ea64ae4.

If the specified file does not exist or is invalid, previously, the unlock
indicator wouldn’t show up at all, because the invalid surface was still used.

With this commit, i3lock will react like if you didn’t specify an image at all.