Hi Kevin, Request you not to top post :-) . > On Tue, Nov 18, 2014 at 10:15 AM, Pranay Srivastava <pranjas@xxxxxxxxx> wrote: >> Hi Kevin >> >> >> >> >> On Tue, Nov 18, 2014 at 1:19 PM, Kevin Wilson <wkevils@xxxxxxxxx> wrote: >>> Hi, >>> I want to write a kernel module which interacts with a userspace daemon. >>> There are cases when the userspace daemon can terminate by some signals. >>> There are also cases where the userspace daemon can crash (in some abnormal >>> cases). Is there a way that the kernel module will be aware of such >>> userspace agent crash, in order to reset its state ? >> >> Can't you reset it when the daemon is about to be killed from the >> userspace itself? Depends on how complex/simple you want >> this but there are several possibilities. Care to tell me how you >> thought about doing this and where you got stuck? >> >> >>> >>> Regards, >>> Kevin >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >> Regards >> -- >> ---P.K.S > >On Fri, Nov 21, 2014 at 4:25 PM, Kevin Wilson <wkevils@xxxxxxxxx> wrote: > The thing is that crash of the daemon sometimes occur, from this > reason or other. > The question is how the kernel module will be aware of such > userspace agent crash, in order to reset its state ? I don't think kernel will know itself. The simplest you can do is put a fault handler in userspace code and have it do a write on a sysfs/procfs file or an ioctl or maybe send signal or enqueue something to another heartbeat daemon , etc, whatever method seems most appropriate to you. Does this sound useful? > > Regards, > Kevin > > -- ---P.K.S _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
