BLOGD
BLOGD
NAMESYNOPSIS
DESCRIPTION
SIGNALS
BUGS
FILES
SEE ALSO
COPYRIGHT
AUTHOR
NAME
blogd − 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 information 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 character device of /dev/console as its controlling tty (would hangup any running getty on that character device).
SIGNALS
blogd
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. |
BUGS
blogd 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/console is not given. After reading /proc blogd tries to restore the status 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 ALSO
showconsole(8), syslogd(8), klogd(8), dmesg(8), proc(5).
COPYRIGHT
2000 Werner Fink, 2000 SuSE GmbH Nuernberg, Germany.
AUTHOR
Werner Fink <werner@suse.de>
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