NAME¶
hald - HAL daemon
SYNOPSIS¶
hald [options]
DESCRIPTION¶
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
/usr/share/doc/hal-doc/spec/hal-spec.html depending on the
distribution.
OPTIONS¶
The following options are supported:
- --daemon=yes|no
- Specify whether to run in the foreground or the
background.
- --verbose=yes|no
- Enable verbose debug output.
- --use-syslog
- Enable logging of debug output to the syslog instead of
stderr. Use this option only together with --verbose.
- --help
- Print out usage.
- --version
- 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
/etc/init.d/haldaemon stop
After having shut down the daemon, you might want to run
pkill hald
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
gdb /usr/sbin/hald
and then typing
run --daemon=no --verbose=yes
at the
(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
(it's 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.
SEE ALSO¶
udev(7),
dbus-daemon(1),
lshal(1),
hal-set-property(1),
hal-get-property(1),
hal-find-by-property(1),
hal-find-by-capability(1),
hal-is-caller-locked-out(1)
AUTHOR¶
Written by David Zeuthen <david@fubar.dk> with a lot of help from many
others.