hald - Unix, Linux Command
hald - HAL daemon
hald is a daemon that maintains a database of the devices
connected to the system system in real-time. The daemon connects to
the D-Bus system message bus to provide an API that applications
can use to discover, monitor and invoke operations on devices. For
more information about both the big picture and specific API details,
refer to the HAL spec which can be found in
/spec/hal-spec.html depending on the distribution.
The following options are supported:
Specify whether to run in the foreground or the background.
Enable verbose debug output.
Enable logging of debug output to the syslog instead of stderr. Use
this option only together with --verbose.
Print out usage.
Print the version of the daemon and exit.
BUGS AND DEBUGGING
Please send bug reports to either the distribution or the HAL
mailing list, see
http://lists.freedesktop.org/mailman/listinfo/hal on how to subscribe.
First, to obtain useful debug traces you will need to have
debuginfo packages installed. On a Fedora system this is in the
hal-debuginfo package and can be installed via the
yum update program.
Second, shut down the existing
hald daemon instance; on a Fedora system this is achieved by
After having shut down the daemon, you might want to run
to ensure that all the helper processe of
hald are killed too. To start the HAL daemon, use
/usr/sbin/hald --daemon=no --verbose=yes
If the daemon crashes, you can start it under a debugger via
and then typing
run --daemon=no --verbose=yes
(gdb) prompt. To capture a back trace, use the
bt command and attach this to the bug report.
Please also attach the output of lshal(1) in the bug report
if possible (its not possible if the
hald daemon crashed). If the nature of the bug has to do with hotplugging,
attach two outputs of lshal(1) - one before the device
hotplug event and one after.
Written by David Zeuthen <email@example.com> with a lot of help from many