[Kde-pim] Proposal for a solution for bug 77682

[Guy Maurel]

Hi!

The bug reports that the problem occurs as the network changes.
No part of imap within kmail takes care of this.                                                                            

Use the NetworkManager. If your distribution hasn't it, have a look at:                                                     
  git clone git://git.freedesktop.org/git/NetworkManager/NetworkManager.git

I propose to connect to the "Solid::Networking::notifier",                                                                    
which sends informations about the network as described at:                                                                 
  kdelibs/solid/solid/networking.h:42
    /**
     * Describes the state of the networking system                                                                         
     */                                                                                                                     
    enum Status {
        Unknown, /**< the networking system is not active or unable to
                                report its status - proceed with caution */                                                           
        Unconnected,/**< the system is not connected to any network */
        Disconnecting, /**< the system is breaking the connection */                                                        
        Connecting, /**< the system is not connected to any network */                                                      
        Connected /**< the system is currently connected to a network */
    };

Create a new slot within "kmkernel".
Make the connect at "void KMKernel::init()".

The new slot
  "void KMKernel::slotNetworkStatusHasChanged( Solid::Networking::Status status)"
gets the changes of the network.

If "Solid::Networking::Unconnected" occurs, we check all the accounts for "KAccount::Imap".

Get the slave address
  lmSlave = imapAcct->slave();
and the pid of the slave
  pid = lmSlave->slave_pid();
prepare the kill-command
  killCommand = "kill "+ s_pid;
and let it works
  system( killCommand.toAscii());

Test and what appens:
After having a connection to the imap-server we have the processes:
  3996 19:00 pts/1 00:00:06 kmail --nofork
  4001 19:00 ?     00:00:00 kdeinit4: kio_imap4 [kdeinit] imap local:/tmp/ksocket-guy-kde

as we unplug (to test it) the ethernet (after a maximum of 60 seconds) we get
  kmail(3996) KMKernel::slotNetworkStatusHasChanged: Networking is now: Unconnected
  kmail(3996) KMKernel::slotNetworkStatusHasChanged: imapAcct->slave: KIO::Slave(0xbc3960)
  kmail(3996) KMKernel::slotNetworkStatusHasChanged: slave_pid: 4001
  kmail(3996) KMKernel::slotNetworkStatusHasChanged: kill-command "kill 4001"

as the process is killed, the slave get an input
  kmail(3996)/kio (Slave) KIO::Slave::gotInput: slave died pid =  4001
  kmail(3996)/kio (Scheduler) KIO::SchedulerPrivate::disconnectSlave: _disconnectSlave(  KIO::Slave(0xbc3960) )
  kmail(3996)/kdeui (KNotification) KNotificationManager::notificationClosed: 234

kmail is now able to go on for a new imap-connection after the network is on again.
-- 
guy maurel
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