Relationship between /dev and /udev

[Andrew]

Paul,

Compare the output of the following

lsof | grep udev
lsof | fgrep /dev

also what version of udev and initscripts are you running? 

I know from my own personal experience running the utopia stack through 
its growth phase from February thru the summer, there were some issues 
with the "udev as dev" cut over.  I'm not even sure I should have the 
dev package installed anymore, but anyway it is my understanding that 
nothing should be touching anything in /udev.   Only the nodes in /dev 
should be used.  It took me an entire eventing to 1 figure that out and 
2) get all my sound things pointing back to /dev.

Do you have selinux enforcing?  Also wasn't there some broken-ness 
around the ramfs to tempfs change over for /dev and mkinitrd?  That is 
only in the very recent updates.

HTH,

Andrew

On my system nothing is using nodes in /udev --
# rpm -q udev
udev-030-10
# rpm -q initscripts
initscripts-7.73-1
(yeah I know thats 3 weeks old but.. still) they work.

# lsof | fgrep /udev
udevd       372    root  txt    REG        3,2    10324    8962153 
/sbin/udevd

[Just the one item]

lsof | fgrep /dev | more
init          1    root   10u  FIFO        3,2             3218125 
/dev/initctl
netplugd   3112    root    0u   CHR        1,3             3217216 /dev/null
...
syslogd    3153    root    0u  unix 0x1cac9980                5213 /dev/log
slapd      3233    ldap    0u   CHR        1,3             3217216 /dev/null
slapd      3233    ldap    1u   CHR        1,3             3217216 /dev/null
...
smbd       3716    root    3r   CHR        1,9             3222909 
/dev/urandom
..
mingetty   3823    root    0u   CHR        4,1             3222006 /dev/tty1
mingetty   3823    root    1u   CHR        4,1             3222006 /dev/tty1
...
mixer_app 13965  andrew   35u   CHR       14,0             3213762 
/dev/mixer
mixer_app 13965  andrew   36u   CHR      116,0             3244050 
/dev/snd/controlC0
...
[the output above was trimmed down since it was several pages... you get 
the idea]




Paul wrote:

>Hi,
>
>I'm still trying to sort out the sound problem I'm currently
>experiencing on my box and I'm looking at hwbrowser.
>
>Now, the soundcards are showing up happily there as is the floppy drive
>(as /dev/fd0 - this is missing in /udev). There is an equivalent entry
>in /udev for all of my hard and optical drives (/dev/hdx etc), there
>isn't a /udev entry for /dev/eth0 though
>
>Is /udev supposed to be a direct mirror of /dev and is it now the case
>that /udev is accessed in preference to /dev (which would account for
>the lack of sound here - /udev/audio, /udev/dsp and /udev/mixer are all
>reported as being missing)?
>
>TTFN
>
>Paul
>  
>