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. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
