README

   1
   2 udev - a userspace implementation of devfs
   3
   4 For more information on the design, and structure of this project, see the
   5 files in the docs/ directory.
   6
   7 To use:
   8
   9 - You must be running a 2.6 version of the Linux kernel.
  10
  11 - Your 2.6 kernel must have had CONFIG_HOTPLUG enabled when it was built.
  12
  13 - Make sure sysfs is mounted.  udev will figure out where sysfs is mounted, but
  14   the traditional place for it is at /sys.  You can mount it by hand by running:
  15         mount -t sysfs none /sys
  16
  17 - Make sure you have the latest version of the linux-hotplug scripts.  They are
  18   available at linux-hotplug.sf.net or from your local kernel.org mirror at:
  19         kernel.org/pub/linux/utils/kernel/hotplug/
  20   They are required in order for udev to work properly.
  21
  22   If for some reason you do not install the hotplug scripts, you must tell the
  23   kernel to point the hotplug binary at wherever you install udev at.  This can
  24   be done by:
  25         echo "/sbin/udev" > /proc/sys/kernel/hotplug
  26
  27 - Build the project:
  28         make
  29
  30   Note:
  31       There are a number of different flags that you can use when building
  32       udev.  They are as follows:
  33         prefix
  34                 set this to the default root that you want udev to be
  35                 installed into.  This works just like the 'configure --prefix'
  36                 script does.  Default value is ''.  Only override this if you
  37                 really know what you are doing.
  38         USE_KLIBC
  39                 if set to 'true', udev is built and linked against the
  40                 included version of klibc.  Default value is 'false'.
  41         USE_LOG
  42                 if set to 'true', udev will emit messages to the syslog when
  43                 it creates or removes device nodes.  This is helpful to see
  44                 what udev is doing.  This is enabled by default.  Note, if you
  45                 are building udev against klibc it is recommended that you
  46                 disable this option (due to klibc's syslog implementation.)
  47         USE_DBUS
  48                 if set to 'true', DBUS messages will be sent everytime udev
  49                 creates or removes a device node.  This requires that DBUS
  50                 development headers and libraries be present on your system to
  51                 build properly.  Default value is 'false'.
  52         DEBUG
  53                 if set to 'true', debugging messages will be sent to the syslog
  54                 as udev is run.  Default value is 'false'.
  55
  56       So, if you want to build udev using klibc with debugging messages, you
  57       would do:
  58         make USE_KLIBC=true DEBUG=true
  59
  60       Note: If you want to use klibc, you will have to set up the "linux"
  61             symlink properly.  See the file klibc/klibc/README and pay
  62             attention to step "a)" there.
  63
  64 - Install the project:
  65         make install
  66
  67   This will put the udev binary in /sbin, create the /udev and /etc/udev
  68   directories, and place the udev configuration files in /etc/udev.  You
  69   will probably want to edit the namedev.* files to create custom naming
  70   rules.  More info on how the config files are set up are contained in
  71   comments in the files, and is located in the documentation.
  72
  73 - Add and remove devices from the system and marvel as nodes are created
  74   and removed in /udev/ based on the device types.
  75
  76 - If you later get sick of it, uninstall it:
  77         make uninstall
  78
  79
  80 Things are still quite rough, but it should work properly.  If nothing
  81 seems to happen, make sure your build worked properly by running the
  82 udev-test.pl script as root in the test/ subdirectory of the udev source
  83 tree.
  84
  85 Development and documentation help is very much appreciated, see the TODO
  86 file for a list of things left to be done.
  87
  88
  89 Any comment/questions/concerns please let me and the other udev developers
  90 know by sending a message to the linux-hotplug-devel mailing list at:
  91         linux-hotplug-devel@lists.sourceforge.net
  92
  93 greg k-h
  94 greg@kroah.com
  95
  96
  97