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diff --git a/devnode/README b/devnode/README new file mode 100644 index 00000000..90ca27cc --- /dev/null +++ b/devnode/README @@ -0,0 +1,25 @@ +[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. |