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SuSE 11.3 - man page for blogd (suse section 8)

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BLOGD(8)			      The SuSE boot concept				 BLOGD(8)

       blogd - boot logging on /dev/console

       /sbin/blogd [/dev/realtty]

       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 con-
       trolling tty (would hangup any running getty on that character device).

       blogd knows a few signal to contol its behavior.

	      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.

       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 pro-
       cesses.	This can fail because blogd forks to run in the background as a daemon.

       /proc/<pid of blogd>/stat
	      the stat file of the blogd process.

	      the system console.

	      logging file which is created by klogd(8) or dmesg(8).

       showconsole(8), syslogd(8), klogd(8), dmesg(8), proc(5).

       2000 Werner Fink, 2000 SuSE GmbH Nuernberg, Germany.

       Werner Fink <werner@suse.de>

3rd Berkeley Distribution		   Nov 10, 2000 				 BLOGD(8)
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