BLOGD(8) The SuSE boot concept BLOGD(8)NAMEblogd - boot logging on /dev/console
SYNOPSIS
/sbin/blogd [/dev/realtty]
DESCRIPTION
Without argument blogd determines the real underlying character device
of /dev/console. blogd spawns a pty/tty pair to reconnect the current
/dev/console with the slave of the pty/tty pair. During writing infor‐
mation from this slave to the real character device a ring buffer is
used to hold the information for writing it to an existing logging
file.
To fetch the real tty of /dev/console the program showconsole(8) can be
used. This has the advantage that blogd will not hold the real charac‐
ter device of /dev/console as its controlling tty (would hangup any
running getty on that character device).
SIGNALSblogd knows a few signal to contol its behavior.
SIGQUIT, SIGINT, and SIGTERM
will cause blogd tries to write out the ring buffer and to exit.
SIGIO says blogd that now it is able to write on /var/log/boot.msg
which means that the file system is mounted read/write and the
kernel messages are written to that file.
SIGSYS says blogd that it should stop writing to disk but continue to
repeat messages to the old devices of the system console.
BUGSblogd needs a mounted /proc and /dev/pts file system and tries to set
the controlling tty to stdin if the real character device of /dev/con‐
sole is not given. After reading /proc blogd tries to restore the sta‐
tus of the controlling tty to avoid problems with getty processes.
This can fail because blogd forks to run in the background as a daemon.
FILES
/proc/<pid of blogd>/stat
the stat file of the blogd process.
/dev/console
the system console.
/var/log/boot.msg
logging file which is created by klogd(8) or dmesg(8).
SEE ALSOshowconsole(8), syslogd(8), klogd(8), dmesg(8), proc(5).
COPYRIGHT
2000 Werner Fink, 2000 SuSE GmbH Nuernberg, Germany.
AUTHOR
Werner Fink <werner@suse.de>
3rd Berkeley Distribution Nov 10, 2000 BLOGD(8)
