On Fri, Mar 25, 2011 at 1:50 PM, Anuz Pratap Singh Tomar <chambilkethakur@xxxxxxxxx> wrote: > > > On Fri, Mar 25, 2011 at 5:43 PM, Anand Arumugam <anand.arumug@xxxxxxxxx> > wrote: >> >> On Thu, Mar 24, 2011 at 5:47 PM, Greg Freemyer <greg.freemyer@xxxxxxxxx> >> wrote: >> > On Tue, Mar 22, 2011 at 1:13 PM, Anand Arumugam <anand.arumug@xxxxxxxxx> >> > wrote: >> >> Hello all! >> >> >> >> I would like to know how logging is done while the kernel is booting >> >> up. More importantly I am looking for those files in the kernel source >> >> that handles the logging part. Also I would like to know what gets >> >> logged after the kernel is up and running. >> >> >> >> Thanks for your time. >> >> >> >> cheers, >> >> -anand. >> > >> > Are you talking about the logs you see when you run dmesg? >> > >> > You are aware the kernel maintains a ring buffer that all printk's go >> > into. >> > >> > Then there are API's that let userspace track the buffer and put the >> > messages into on disk logs. >> > >> > dmesg just dumps out the ring buffer queue. >> > >> > The userspace API to the ring buffer is syslog(). >> > >> > So during bootup I _assume_ the kernel is just logging to the ring >> > buffer, and then when the system is operational enough, userspace gets >> > all the boot messages out of the kernel via syslog() and puts them to >> > on disk log files. >> > >> > It's not too magic. >> > >> > Greg >> > >> >> I was looking for the logging framework used by the kernel developers. >> Not just the dmesg logs. >> > > hope this helps: > http://www.ibm.com/developerworks/linux/library/l-kernel-logging-apis/?ca=drs- > > this is a tool and good read otherwise: > > http://www.cs.huji.ac.il/~etsman/klogger/ > @Greg-Freemyer and @Anuz: Thank you so much for the references and clarifications. cheers... _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
