BOOTLOGD(8) Linux System Administrators Manual BOOTLOGD(8)
bootlogd - record boot messages
/sbin/bootlogd [-c] [-d] [-r] [-s] [-v] [ -l logfile ] [ -p pidfile ]
Bootlogd runs in the background and copies all strings sent to the
/dev/console device to a logfile. If the logfile is not accessible, the
messages will be kept in memory until it is.
-d Do not fork and run in the background.
-c Attempt to write to the logfile even if it does not yet exist.
Without this option, bootlogd will wait for the logfile to
appear before attempting to write to it. This behavior prevents
bootlogd from creating logfiles under mount points.
-r If there is an existing logfile called logfile rename it to log
file~ unless logfile~ already exists.
-s Ensure that the data is written to the file after each line by
calling fdatasync(3). This will slow down a fsck(8) process
running in parallel.
-v Show version.
Log to this logfile. The default is /var/log/boot.
Put process-id in this file. The default is no pidfile.
Bootlogd works by redirecting the console output from the console
device. (Consequently bootlogd requires PTY support in the kernel con
figuration.) It copies that output to the real console device and to a
log file. There is no standard way of ascertaining the real console
device if you have a new-style /dev/console device (major 5, minor 1)
so bootlogd parses the kernel command line looking for console=...
lines and deduces the real console device from that. If that syntax is
ever changed by the kernel, or a console type is used that bootlogd
does not know about then bootlogd will not work.
Miquel van Smoorenburg, email@example.com
Jul 21, 2003 BOOTLOGD(8)