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kay.sievers@vrfy.org 35b7d88c0d [PATCH] udevd - next round of fixes 
Here is the next round. We have three queues now. All incoming messages
are queued in msg_list and if nothing is missing we move it to the
running_list and exec in the background.
If the exec comes back, it removes the message from the running_list and
frees the message.

Before we exec, we check the running_list if there is a udev running on
the same device path. If yes, we move the message to the delay_list. If
the former exec comes back, we move the message to the running_list and
exec it.

The very first event is delayed now to catch possible earlier sequences,
every following event is executed without delay if no sequence is missing.

The daemon doesn't exit by itself any longer, cause we don't want to
delay every first exec.

I've put a $(PWD) for now in the Makefile for testing this beast. Only
the local binaries are executed, not the /sbin/udev. We can change it
if we are ready for real testing.

And SIGKILL can't be cought, so I removed it from the handler :)


06:58:36 sig_handler: caught signal 15
06:58:36 main: using ipc queue 0x2d548
06:58:37 message is still in the ipc queue, starting daemon...
06:58:37 work: received sequence 3, expected sequence 0
06:58:37 msg_dump_queue: sequence 3 in queue
06:58:37 set_timeout: set timeout in 1 seconds
06:58:37 main: using ipc queue 0x2d548
06:58:37 main: using ipc queue 0x2d548
06:58:37 work: received sequence 1, expected sequence 1
06:58:37 msg_dump_queue: sequence 1 in queue
06:58:37 msg_dump_queue: sequence 3 in queue
06:58:37 msg_dump: sequence 1, 'add', '/block/sda', 'block'
06:58:37 msg_exec: child [8038] created
06:58:37 running_moveto_queue: move sequence 1 [8038] to running queue '/block/sda'
06:58:37 set_timeout: set timeout in 5 seconds
06:58:37 work: received sequence 2, expected sequence 2
06:58:37 msg_dump_queue: sequence 2 in queue
06:58:37 msg_dump_queue: sequence 3 in queue
06:58:37 msg_dump: sequence 2, 'add', '/block/sdb', 'block'
06:58:37 msg_exec: child [8039] created
06:58:37 running_moveto_queue: move sequence 2 [8039] to running queue '/block/sdb'
06:58:37 msg_dump: sequence 3, 'add', '/block/sdc', 'block'
06:58:37 msg_exec: child [8040] created
06:58:37 running_moveto_queue: move sequence 3 [8040] to running queue '/block/sdc'
06:58:37 main: using ipc queue 0x2d548
06:58:37 main: using ipc queue 0x2d548
06:58:37 work: received sequence 4, expected sequence 4
06:58:37 msg_dump_queue: sequence 4 in queue
06:58:37 msg_dump: sequence 4, 'remove', '/block/sdc', 'block'
06:58:37 msg_exec: delay exec of sequence 4, [8040] already working on '/block/sdc'
06:58:37 delayed_moveto_queue: move event to delayed queue '/block/sdc'
06:58:37 msg_exec: child [8043] created
06:58:37 running_moveto_queue: move sequence 4 [8043] to running queue '/block/sdc'
06:58:37 work: received sequence 5, expected sequence 5
06:58:37 msg_dump_queue: sequence 5 in queue
06:58:37 msg_dump: sequence 5, 'remove', '/block/sdb', 'block'
06:58:37 msg_exec: delay exec of sequence 5, [8039] already working on '/block/sdb'
06:58:37 delayed_moveto_queue: move event to delayed queue '/block/sdb'
06:58:37 msg_exec: child [8044] created
06:58:37 running_moveto_queue: move sequence 5 [8044] to running queue '/block/sdb'
06:58:37 main: using ipc queue 0x2d548
06:58:37 main: using ipc queue 0x2d548
06:58:37 work: received sequence 8, expected sequence 6
06:58:37 msg_dump_queue: sequence 8 in queue
06:58:37 set_timeout: set timeout in 5 seconds
06:58:37 work: received sequence 6, expected sequence 6
06:58:37 msg_dump_queue: sequence 6 in queue
06:58:37 msg_dump_queue: sequence 8 in queue
06:58:37 msg_dump: sequence 6, 'remove', '/block/sda', 'block'
06:58:37 msg_exec: delay exec of sequence 6, [8038] already working on '/block/sda'
06:58:37 delayed_moveto_queue: move event to delayed queue '/block/sda'
06:58:37 msg_exec: child [8047] created
06:58:37 running_moveto_queue: move sequence 6 [8047] to running queue '/block/sda'
06:58:37 set_timeout: set timeout in 5 seconds
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8038
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8039
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8040
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8043
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8044
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:38 sig_handler: caught signal 17
06:58:38 sig_handler: exec finished, pid 8047
06:58:38 set_timeout: set timeout in 4 seconds
06:58:38 msg_dump_queue: sequence 8 in queue
06:58:39 main: using ipc queue 0x2d548
06:58:39 main: using ipc queue 0x2d548
06:58:39 work: received sequence 9, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:39 work: received sequence 11, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 msg_dump_queue: sequence 11 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:39 main: using ipc queue 0x2d548
06:58:39 work: received sequence 10, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 msg_dump_queue: sequence 10 in queue
06:58:39 msg_dump_queue: sequence 11 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:39 main: using ipc queue 0x2d548
06:58:39 work: received sequence 13, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 msg_dump_queue: sequence 10 in queue
06:58:39 msg_dump_queue: sequence 11 in queue
06:58:39 msg_dump_queue: sequence 13 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:39 main: using ipc queue 0x2d548
06:58:39 work: received sequence 14, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 msg_dump_queue: sequence 10 in queue
06:58:39 msg_dump_queue: sequence 11 in queue
06:58:39 msg_dump_queue: sequence 13 in queue
06:58:39 msg_dump_queue: sequence 14 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:39 main: using ipc queue 0x2d548
06:58:39 work: received sequence 15, expected sequence 7
06:58:39 msg_dump_queue: sequence 8 in queue
06:58:39 msg_dump_queue: sequence 9 in queue
06:58:39 msg_dump_queue: sequence 10 in queue
06:58:39 msg_dump_queue: sequence 11 in queue
06:58:39 msg_dump_queue: sequence 13 in queue
06:58:39 msg_dump_queue: sequence 14 in queue
06:58:39 msg_dump_queue: sequence 15 in queue
06:58:39 set_timeout: set timeout in 3 seconds
06:58:41 main: using ipc queue 0x2d548
06:58:41 work: received sequence 12, expected sequence 7
06:58:41 msg_dump_queue: sequence 8 in queue
06:58:41 msg_dump_queue: sequence 9 in queue
06:58:41 msg_dump_queue: sequence 10 in queue
06:58:41 msg_dump_queue: sequence 11 in queue
06:58:41 msg_dump_queue: sequence 12 in queue
06:58:41 msg_dump_queue: sequence 13 in queue
06:58:41 msg_dump_queue: sequence 14 in queue
06:58:41 msg_dump_queue: sequence 15 in queue
06:58:41 set_timeout: set timeout in 1 seconds
06:58:42 sig_handler: caught signal 14
06:58:42 sig_handler: event timeout reached
06:58:42 event 8, age 5 seconds, skip event 7-7
06:58:42 msg_dump: sequence 8, 'add', '/block/sdb', 'block'
06:58:42 msg_exec: child [8057] created
06:58:42 running_moveto_queue: move sequence 8 [8057] to running queue '/block/sdb'
06:58:42 msg_dump: sequence 9, 'add', '/block/sdc', 'block'
06:58:42 msg_exec: child [8058] created
06:58:42 running_moveto_queue: move sequence 9 [8058] to running queue '/block/sdc'
06:58:42 msg_dump: sequence 10, 'remove', '/block/sdc', 'block'
06:58:42 msg_exec: delay exec of sequence 10, [8058] already working on '/block/sdc'
06:58:42 delayed_moveto_queue: move event to delayed queue '/block/sdc'
06:58:42 msg_exec: child [8059] created
06:58:42 running_moveto_queue: move sequence 10 [8059] to running queue '/block/sdc'
06:58:42 msg_dump: sequence 11, 'remove', '/block/sdb', 'block'
06:58:42 msg_exec: delay exec of sequence 11, [8057] already working on '/block/sdb'
06:58:42 delayed_moveto_queue: move event to delayed queue '/block/sdb'
06:58:42 msg_exec: child [8060] created
06:58:42 running_moveto_queue: move sequence 11 [8060] to running queue '/block/sdb'
06:58:42 msg_dump: sequence 12, 'remove', '/block/sda', 'block'
06:58:42 msg_exec: child [8061] created
06:58:42 running_moveto_queue: move sequence 12 [8061] to running queue '/block/sda'
06:58:42 msg_dump: sequence 13, 'add', '/block/sda', 'block'
06:58:42 msg_exec: delay exec of sequence 13, [8061] already working on '/block/sda'
06:58:42 delayed_moveto_queue: move event to delayed queue '/block/sda'
06:58:42 msg_exec: child [8062] created
06:58:42 running_moveto_queue: move sequence 13 [8062] to running queue '/block/sda'
06:58:42 msg_dump: sequence 14, 'add', '/block/sdb', 'block'
06:58:42 msg_exec: delay exec of sequence 14, [8057] already working on '/block/sdb'
06:58:42 delayed_moveto_queue: move event to delayed queue '/block/sdb'
06:58:42 msg_exec: child [8063] created
06:58:42 running_moveto_queue: move sequence 14 [8063] to running queue '/block/sdb'
06:58:42 msg_dump: sequence 15, 'add', '/block/sdc', 'block'
06:58:42 msg_exec: delay exec of sequence 15, [8058] already working on '/block/sdc'
06:58:42 delayed_moveto_queue: move event to delayed queue '/block/sdc'
06:58:42 msg_exec: child [8064] created
06:58:42 running_moveto_queue: move sequence 15 [8064] to running queue '/block/sdc'
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8057
06:58:43 sig_handler: exec finished, pid 8058
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8059
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8060
06:58:43 sig_handler: exec finished, pid 8061
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8062
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8063
06:58:43 sig_handler: caught signal 17
06:58:43 sig_handler: exec finished, pid 8064
2005-04-26 21:13:19 -07:00
docs [PATCH] minor grammer fixes for the udev_vs_devfs document 2005-04-26 21:13:14 -07:00
etc [PATCH] LFS init script update 2005-04-26 21:13:18 -07:00
extras [PATCH] move udevinfo into the main build and clean up the main Makefile a bit. 2005-04-26 21:13:18 -07:00
klibc [PATCH] update klibc to version 0.98 2005-04-26 21:13:19 -07:00
libsysfs [PATCH] libsysfs update for refresh + namedev.c changes 2005-04-26 21:13:16 -07:00
tdb [PATCH] signal fixes due to klibc update. 2005-04-26 21:13:08 -07:00
test [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00
ChangeLog [PATCH] v015 release 2005-04-26 21:13:19 -07:00
COPYING [PATCH] added initial documentation and gpl license 2005-04-26 21:00:32 -07:00
FAQ [PATCH] update the FAQ with info about bad modprobe events from the devfs scheme... 2005-04-26 21:13:08 -07:00
klibc_fixups.c [PATCH] get rid of functions in klibc_fixups that are now in klibc 2005-04-26 21:13:02 -07:00
klibc_fixups.h [PATCH] udev - exec status fix for klibc 2005-04-26 21:13:14 -07:00
list.h [PATCH] Initial namedev parsing of config files 2005-04-26 21:01:38 -07:00
logging.c [PATCH] add udev logging to info log 2005-04-26 21:13:17 -07:00
logging.h [PATCH] misc code cleanups. 2005-04-26 21:13:17 -07:00
Makefile [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00
namedev_parse.c [PATCH] move get_pair to udev_config.c because udevinfo doesn't need all of namedev.o 2005-04-26 21:13:19 -07:00
namedev.c [PATCH] udev - trivial style cleanup 2005-04-26 21:13:19 -07:00
namedev.h [PATCH] move get_pair to udev_config.c because udevinfo doesn't need all of namedev.o 2005-04-26 21:13:19 -07:00
README [PATCH] clean up the logging patch a bit to make the option more like the other options. 2005-04-26 21:13:17 -07:00
TODO [PATCH] remove TODO item about BUS value, as it is now done. 2005-04-26 21:13:17 -07:00
udev_config.c [PATCH] move get_pair to udev_config.c because udevinfo doesn't need all of namedev.o 2005-04-26 21:13:19 -07:00
udev_dbus.c [PATCH] allow dbus code to actually build again. 2005-04-26 21:13:19 -07:00
udev_dbus.h [PATCH] move all of the DBUS logic into one file and remove all of the #ifdef crud from the main code. 2005-04-26 21:13:06 -07:00
udev-add.c [PATCH] set default owner/group in db - update 2005-04-26 21:13:17 -07:00
udev-remove.c [PATCH] add udev logging to info log 2005-04-26 21:13:17 -07:00
udev.8 [PATCH] remove command line documentation from udev man page 2005-04-26 21:13:19 -07:00
udev.c [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00
udev.h [PATCH] move get_pair to udev_config.c because udevinfo doesn't need all of namedev.o 2005-04-26 21:13:19 -07:00
udev.spec [PATCH] 015_bk mark 2005-04-26 21:13:19 -07:00
udevd.c [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00
udevd.h [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00
udevdb.c [PATCH] udev - reverse user query options 2005-04-26 21:13:17 -07:00
udevdb.h [PATCH] udev - reverse user query options 2005-04-26 21:13:17 -07:00
udevinfo.8 [PATCH] udevinfo - missing options for man page 2005-04-26 21:13:19 -07:00
udevinfo.c [PATCH] udev - trivial style cleanup 2005-04-26 21:13:19 -07:00
udevsend.c [PATCH] udevd - next round of fixes 2005-04-26 21:13:19 -07:00

README 

udev - a userspace implementation of devfs

For more information on the design, and structure of this project, see the
files in the docs/ directory.

To use:

- You must be running a 2.6 version of the Linux kernel.

- Your 2.6 kernel must have had CONFIG_HOTPLUG enabled when it was built.

- Make sure sysfs is mounted.  udev will figure out where sysfs is mounted, but
  the traditional place for it is at /sys.  You can mount it by hand by running:
  	mount -t sysfs none /sys

- Make sure you have the latest version of the linux-hotplug scripts.  They are
  available at linux-hotplug.sf.net or from your local kernel.org mirror at:
	kernel.org/pub/linux/utils/kernel/hotplug/
  They are required in order for udev to work properly.

  If for some reason you do not install the hotplug scripts, you must tell the
  kernel to point the hotplug binary at wherever you install udev at.  This can
  be done by:
	echo "/sbin/udev" > /proc/sys/kernel/hotplug

- Build the project:
	make

  Note:
      There are a number of different flags that you can use when building
      udev.  They are as follows:
	prefix
		set this to the default root that you want udev to be
		installed into.  This works just like the 'configure --prefix'
		script does.  Default value is ''.  Only override this if you
		really know what you are doing.
	USE_KLIBC
		if set to 'true', udev is built and linked against the
		included version of klibc.  Default value is 'false'.
	USE_LOG
		if set to 'true', udev will emit messages to the syslog when
		it creates or removes device nodes.  This is helpful to see
		what udev is doing.  This is enabled by default.  Note, if you
		are building udev against klibc it is recommended that you
		disable this option (due to klibc's syslog implementation.)
	USE_DBUS
		if set to 'true', DBUS messages will be sent everytime udev
		creates or removes a device node.  This requires that DBUS
		development headers and libraries be present on your system to
		build properly.  Default value is 'false'.
	DEBUG
		if set to 'true', debugging messages will be sent to the syslog
		as udev is run.  Default value is 'false'.

      So, if you want to build udev using klibc with debugging messages, you
      would do:
	make USE_KLIBC=true DEBUG=true

      Note: If you want to use klibc, you will have to set up the "linux"
            symlink properly.  See the file klibc/klibc/README and pay
	    attention to step "a)" there.

- Install the project:
	make install

  This will put the udev binary in /sbin, create the /udev and /etc/udev
  directories, and place the udev configuration files in /etc/udev.  You
  will probably want to edit the namedev.* files to create custom naming
  rules.  More info on how the config files are set up are contained in
  comments in the files, and is located in the documentation.

- Add and remove devices from the system and marvel as nodes are created
  and removed in /udev/ based on the device types.

- If you later get sick of it, uninstall it:
	make uninstall


Things are still quite rough, but it should work properly.  If nothing
seems to happen, make sure your build worked properly by running the
udev-test.pl script as root in the test/ subdirectory of the udev source
tree.

Development and documentation help is very much appreciated, see the TODO
file for a list of things left to be done.


Any comment/questions/concerns please let me and the other udev developers
know by sending a message to the linux-hotplug-devel mailing list at:
	linux-hotplug-devel@lists.sourceforge.net

greg k-h
greg@kroah.com