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108 lines
4.1 KiB
Plaintext
108 lines
4.1 KiB
Plaintext
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udev - a userspace device manager
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For more information on the design, and structure of this project, see the
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files in the docs/ directory.
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To use:
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- You must be running a 2.6 version of the Linux kernel.
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- Your 2.6 kernel must have had CONFIG_HOTPLUG enabled when it was built.
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- Make sure sysfs is mounted at /sys. No other location is supported.
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You can mount it by running:
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mount -t sysfs none /sys
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- Make sure you integrate udev with your hotplug setup. There is a copy of
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the rules files for all major distros in the etc/udev folder. You may look
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there how others are doing it.
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- Make sure you integrate with the kernel hotplug events. Later versions of
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udev are able to listen directly to a netlink socket, older versions used
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udevsend to feed the udev daemon with the kernel event. The most basic
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setup to run udev is to let the kernel for the udev binary directly:
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echo "/sbin/udev" > /proc/sys/kernel/hotplug
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While this may work in some setups, it is not recommended to do. A recent
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kernel and udev version is able to operate with the event serializing daemon
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udevd, that makes sure, that no "remove" event will beat a "add" event for
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the same device.
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- Build the project:
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make
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Note:
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There are a number of different flags that you can use when building
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udev. They are as follows:
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prefix
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set this to the default root that you want udev to be
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installed into. This works just like the 'configure --prefix'
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script does. Default value is ''. Only override this if you
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really know what you are doing.
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USE_KLIBC
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if set to 'true', udev is built and linked against the
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included version of klibc. Default value is 'false'.
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USE_LOG
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if set to 'true', udev will emit messages to the syslog when
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it creates or removes device nodes. This is helpful to see
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what udev is doing. This is enabled by default. Note, if you
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are building udev against klibc it is recommended that you
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disable this option (due to klibc's syslog implementation.)
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USE_SELINUX
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if set to 'true', udev will be built with SELinux support
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enabled. This is disabled by default.
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DEBUG
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if set to 'true', debugging messages will be sent to the syslog
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as udev is run. Default value is 'false'.
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KERNEL_DIR
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If this is not set it will default to /lib/modules/`uname -r`/build
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This is used if USE_KLIBC=true to find the kernel include
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directory that klibc needs to build against. This must be set
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if you are not building udev while running a 2.6 kernel.
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EXTRAS
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if set, will build the "extra" helper programs as specified
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as listed (see below for an example.)
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So, if you want to build udev using klibc with debugging messages, you
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would do:
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make USE_KLIBC=true DEBUG=true
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If you want to build the udev helper program cdrom_id and scsi_id you
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would do:
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make EXTRAS="extras/cdrom_id extras/scsi_id"
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udev will follow the setting of the debug level in udev.conf. Adapt this
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value to see the debug in syslog.
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- Install the project:
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make install
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This will put the udev binaries in /sbin, create the and /etc/udev
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directories, and place the udev configuration files in /etc/udev/. You
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will probably want to edit the *.rules files to create custom naming
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rules. More info on how the config files are set up are contained in
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comments in the files, and is located in the documentation.
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- Add and remove devices from the system and marvel as nodes are created
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and removed in /dev based on the device types.
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- If you later get sick of it, uninstall it:
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make uninstall
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If nothing seems to happen, make sure your build worked properly by
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running the udev-test.pl script as root in the test/ subdirectory of the
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udev source tree. Running udevstart should populate an empty /dev
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directory. You may test, if a node is recreated after running udevstart.
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Development and documentation help is very much appreciated, see the TODO
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file for a list of things left to be done.
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Any comment/questions/concerns please let me and the other udev developers
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know by sending a message to the linux-hotplug-devel mailing list at:
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linux-hotplug-devel@lists.sourceforge.net
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greg k-h
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greg@kroah.com
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