CDEMU-DAEMON(8)

NAME
cdemud - The CDEmu daemon

SYNOPSIS
cdemu-daemon [options]

DESCRIPTION
This is CDEmu daemon, the userspace part of the cdemu suite, a free, GPL CD/DVD-ROM device emulator for linux. It receives SCSI commands from kernel module and processes them, passing the requested data back to the kernel. Daemon implements the actual virtual device; one instance per each device registered by kernel module. It uses libMirage, an image access library that is part of the cdemu suite, for the image access (e.g. sector reading). The daemon registers itself on D-BUS' system or session bus (depending on the options passed to it) where it exposes an interface that can be used by clients to control it.

OPTIONS

--config-file=filename
    Configuration file to load. See Configuration file section for details.

-n --num-devices=N
    Number of devices. Specifies the number of virtual devices the daemon instance should register with kernel module and control. By default, 1 virtual device is created.

-c --ctl-device=path
    Control device. Specifies the control device path. Control device is a character device provided by kernel module; it is used for communication between kernel and userspace part of CDEmu suite. By default, /dev/vhba_ctl is used.

-a --audio-driver=driver
    Audio driver. Specifies audio driver to be used by virtual devices' audio play. Since libao is used for audio playback, any valid libao driver can be specified. If default is used as a driver, then libao's default driver is used. Few examples of valid libao drivers are alsa, oss, pulse or null. For all drivers, default device is used. By default, if audio driver is not explicitly specified via this option, null is used.

-b --bus=bus_type
    Bus type. Valid options are system or session. By default, session bus is used. (Please note that the running of CDEmu daemon on system bus is considered deprecated and is discouraged for security reasons).

-l --logfile=logfile
    Log file to write logging output into. By default, use of log file is disabled and messages are written to stdout.

--default-cdemu-debug-mask=mask
    Default debug mask for CDEmu devices (at CDEmu daemon implementation level). Default value is 0.

--default-mirage-debug-mask=mask
    Default debug mask for CDEmu devices (at libMirage implementation level). Default value is 0.

--system-sleep-handler=0|1
    Enable or disable systemd-logind system sleep handler. When enabled, the daemon attempts to obtain delaying sleep inhibitor lock from the org.freedesktop.login1.Manager systemd-logind interface at /org/freedesktop/login1 on the system bus, and registers handler for the prepare-for-sleep signal. When system is about to enter suspend/hibernation (as indicated by received signal), the virtual devices are stopped, and inhibitor lock is released. After system resumes (as indicated by received signal), the inhibitor lock is re-acquired, and virtual devices are restarted. This mechanism attempts to mitigate issues with active virtual devices preventing the system from properly suspending/hibernating. Default value is 1 (the handler is enabled). If sleep handler functionality is disabled at build time, this option has no effect.

-? --help
    Display the help message.

EXAMPLES

Running daemon on default bus with PulseAudio audio driver and 4 virtual devices:
    cdemu-daemon --num-devices=4 --audio-driver=pulse

Running daemon on system bus with 2 virtual devices and logging redirected to a file:
    cdemu-daemon --num-devices=2 --bus=system --logfile=/tmp/cdemu-daemon.log

CONFIGURATION FILE
The daemon's settings can be collected in a configuration file, which is passed to the daemon via --config-file option. Configuration file contains key=value pairs that are contained in a single [settings] section. The keys in configuration file correspond to the long names of command-line switches. If an option is specified in both configuration file and on command-line, the latter takes precedence. If the specified configuration file does not exist, it is silently ignored. If the specified configuration file is invalid (e.g., has invalid syntax, or does not contain a section), an error is raised. Example Saving the following configuration to a file and passing it to the daemon via --config-file is equivalent to passing --num-devices=2 --audio-driver=pulse directly to the daemon: [settings]
num-devices=2
audio-driver=pulse

AUTHORS

Rok Mandeljc <rok.mandeljc@gmail.com>

CDEmu project's web page: http://cdemu.sourceforge.net

CDEmu project's mailing list: cdemu-devel@lists.sourceforge.net