kay.sievers@vrfy.org
35b7d88c0d
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
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