Udev question

Udev question

[Vallimar]

Hello!

Mailing you folks is pretty much my last resort, but since I cannot seem
to find the information I'm looking for anywhere, I thought I'd give it a
shot. Essentially, I'm wondering if you might be able to give me a list of
kernel paramaters necessary to make udev work. I run a fairly customized
kernel install and I don't want to enable gobs of options that I don't
need/use. From what I can gather, most places and the documentation itself
indicates you need proc/tmpfs/pty/sysfs, some older ones say you need
hotplug, but from looking at the newer udev, that doesn't seem to be the
case anymore? However, from looking at more info and peeking at the code
a bit and just from the debug errors I get, it seems it requires some
uevent/netlink stuff. The only problem I have with that is with the latest
kernel, there are several netlink options so how am I supposed to know
which ones I need? Right now I have none of them enabled since I've never
needed them but I am trying to get a working parallel udev setup to see if
it would be beneficial for me to switch over to that from a static /dev
tree. In essence, I'm suggesting that it would be nice for us non-distro
users if the udev package contained a list of must-be-enabled kernel options
in order for things to work.


Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid\x120709&bid&3057&dat\x121642
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

Re: Udev question

[Kay Sievers]

On Wed, 2006-07-05 at 13:08 -0400, Vallimar wrote:
> Mailing you folks is pretty much my last resort, but since I cannot seem
> to find the information I'm looking for anywhere, I thought I'd give it a
> shot. Essentially, I'm wondering if you might be able to give me a list of
> kernel paramaters necessary to make udev work. I run a fairly customized
> kernel install and I don't want to enable gobs of options that I don't
> need/use. From what I can gather, most places and the documentation itself
> indicates you need proc/tmpfs/pty/sysfs, some older ones say you need
> hotplug, but from looking at the newer udev, that doesn't seem to be the
> case anymore? However, from looking at more info and peeking at the code
> a bit and just from the debug errors I get, it seems it requires some
> uevent/netlink stuff. The only problem I have with that is with the latest
> kernel, there are several netlink options so how am I supposed to know
> which ones I need? Right now I have none of them enabled since I've never
> needed them but I am trying to get a working parallel udev setup to see if
> it would be beneficial for me to switch over to that from a static /dev
> tree. In essence, I'm suggesting that it would be nice for us non-distro
> users if the udev package contained a list of must-be-enabled kernel options
> in order for things to work.

There are no options you can reach, if you don't enable CONFIG_EMBEDDED.
The network stack itself depends on netlink, so you usually can't switch
that off too.

Kay


Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid\x120709&bid&3057&dat\x121642
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

Re: Udev question

[Vallimar]

On Wed, July 5, 2006 1:21 pm, Kay Sievers wrote:
>
> There are no options you can reach, if you don't enable CONFIG_EMBEDDED.
> The network stack itself depends on netlink, so you usually can't switch
> that off too.
>

Well, I have networking just fine.. maybe you can suggest why I keep
getting these errors then?

Jul  5 19:08:41 omicron udevd[18429]: main: will daemonize
Jul  5 19:08:41 omicron udevd[18429]: init_uevent_netlink_sock: bind
failed: No such file or directory
Jul  5 19:08:41 omicron udevd[18429]: main: uevent socket not available
Jul  5 19:08:41 omicron udevsettle[18431]: main: queue is empty

And then the daemon terminates...

Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid\x120709&bid&3057&dat\x121642
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

Re: Udev question

[Kay Sievers]

On Wed, 2006-07-05 at 19:14 -0400, Vallimar wrote:
> On Wed, July 5, 2006 1:21 pm, Kay Sievers wrote:
> >
> > There are no options you can reach, if you don't enable CONFIG_EMBEDDED.
> > The network stack itself depends on netlink, so you usually can't switch
> > that off too.
> >
> 
> Well, I have networking just fine.. maybe you can suggest why I keep
> getting these errors then?
> 
> Jul  5 19:08:41 omicron udevd[18429]: main: will daemonize
> Jul  5 19:08:41 omicron udevd[18429]: init_uevent_netlink_sock: bind
> failed: No such file or directory
> Jul  5 19:08:41 omicron udevd[18429]: main: uevent socket not available
> Jul  5 19:08:41 omicron udevsettle[18431]: main: queue is empty
> 
> And then the daemon terminates...

Ick, no idea how this can happen.

What does:
  cat /proc/net/netlink
print? It has a line like this, when the daemon is listening:
  sk       Eth Pid    Groups   Rmem     Wmem     Dump     Locks
  f257a800 15  16733  ffffffff 0        0        00000000 2


What does:
  strace -s1000 -t udevmonitor
print? It looks like this, if it works:
  socket(PF_NETLINK, SOCK_DGRAM, 15)      = 4
  bind(4, {sa_family¯_NETLINK, pid\x16739, groupsÿffffff}, 12) = 0

Kay


Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid\x120709&bid&3057&dat\x121642
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

udev question

[Lukas Hejtmanek]

Hello,

is is possible to prevent _some_ modules to be loaded at boot time while
allowing them to be loaded later?

I know about /etc/modprobe.d/blacklist but listing a module there prevent
aliases expansion.

E.g. I want ipw2200 module not to be loaded at system boot, but I want this
module to be loaded if I do ifconfig eth1 up. Is this possible?

-- 
Luká¹ Hejtmánek

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CIDÞVDEV
_______________________________________________
Linux-hotplug-devel mailing list  http://linux-hotplug.sourceforge.net
Linux-hotplug-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel