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[Introduction]
devnode is a translator that creates the device file for the kernel device. It provides another way for other programs to open the kernel device.
The device file should be created in /dev with the device name as its file name, so clients can find the device file easily.
Clients need to get the port to the devnode translator by calling file_name_lookup() and uses this port as a master device port to open the device by calling device_open(). The device name used in device_open() is specified by '-n' option of devnode.
[Usage]
Usage: devnode [OPTION...] device
Hurd devnode translator.
-n, --name=DEVICENAME Accept open from clients only with DEVICENAME
-M, --master_device=FILE Get a pseudo master device port
-?, --help Give this help list
--usage Give a short usage message
-V, --version Print program version
The '-n' option specifies the device name used by clients in device_open(). It can be optional. If it's specified, clients must use the name to open the device. Otherwise, every device name used by clients in device_open() is acceptable.
The '-M' option specifies the file where devnode can get the master device port. This option can be useful to open the virtual interface created by eth-multiplexer, for example.
[Internal]
devnode is very simple. It implements the server side functions in device.defs, so it can receive the request of opening a device from clients. Only ds_device_open is actually implemented, which opens the device and returns the port to the device. Normally, devnode shouldn't get other requests.
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