Review Request 117091: Force the screen locker's greeter to show the password input field in case of immediateLock

[Thomas Lübking]

> On April 22, 2014, 5:34 p.m., Thomas Lübking wrote:
> > ksmserver/screenlocker/greeter/main.cpp, line 89
> > <https://git.reviewboard.kde.org/r/117091/diff/2/?file=262501#file262501line89>
> >
> >     ooc.: what's wrong about just:
> >        signal(SIGUSR1, signalHandler); ?
> 
> Wolfgang Bauer wrote:
>     signal() is deprecated, according to its manpage. "man signal" even says:
>            The behavior of signal() varies across UNIX versions, and has also var-
>            ied historically across different versions of Linux. Avoid  its  use:
>            use sigaction(2) instead.  See Portability below.
> 
> Thomas Lübking wrote:
>     the posix manpage does of course not state that ... luckily it wraps around sigaction on BSD defaults on "modern" glibc systems - pfeew ;-)
>     
>     sigaction(SIGUSR1, &sa, NULL); // for later nullptr
>     
>     i doubt that you'll need another update for that, though.
> 
> Wolfgang Bauer wrote:
>     Well, should I change it?
>     
>     In kscreensaver/libkscreensaver/main.cpp they used sigaction() as well.

0 -> NULL: yes.
sigaction -> signal: no.

it just doesn't seem too much of a problem that I've constantly been using signal() whenever i needed it ;-)


- Thomas


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On April 22, 2014, 7:56 p.m., Wolfgang Bauer wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/117091/
> -----------------------------------------------------------
> 
> (Updated April 22, 2014, 7:56 p.m.)
> 
> 
> Review request for kde-workspace, Plasma and Aaron J. Seigo.
> 
> 
> Bugs: 327947 and 329076
>     http://bugs.kde.org/show_bug.cgi?id=327947
>     http://bugs.kde.org/show_bug.cgi?id=329076
> 
> 
> Repository: kde-workspace
> 
> 
> Description
> -------
> 
> If the screen locker is set to not require a password to unlock, it will not show the password input field even when the powermanagement settings suspend the system and are set to require a password after resume (when it was already running at that point).
> This locks people out of their system.
> 
> This patch adds a signal handler for SIGUSR1 that switches the running greeter to immediateLock mode. The locker sends that signal to make sure the greeter shows the password input field when necessary.
> 
> 
> Diffs
> -----
> 
>   ksmserver/screenlocker/greeter/greeterapp.h 8b79188 
>   ksmserver/screenlocker/greeter/greeterapp.cpp c5e2f85 
>   ksmserver/screenlocker/greeter/main.cpp d898734 
>   ksmserver/screenlocker/ksldapp.cpp 3dfcc9e 
> 
> Diff: https://git.reviewboard.kde.org/r/117091/diff/
> 
> 
> Testing
> -------
> 
> Disable "Require password after" in the screen locker settings (the default), set it to start after 1 min. (for easier testing).
> Enable "Suspend session after" and set it to 2 minutes. (set the action to "Suspend", "Hibernate", or "Lock Screen", doesn't matter)
> Make sure "Lock screen on resume" is enabled in the powermanagements "Advanced Options" (it is by default).
> 
> After 1 minute the screen locker kicks in, and doesn't require a password.
> After 2 minutes the session gets suspended, hibernated or locked, and requires a password to resume.
> 
> Without this patch no password dialog is shown, the user cannot resume the session by entering the password.
> 
> With this patch this works: there is a password input field, the session is unlocked when the user enters the password.
> 
> 
> Thanks,
> 
> Wolfgang Bauer
> 
>

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