Newbie question about generation of symlinks

Newbie question about generation of symlinks

[Juergen Rose]

Hi,

I made a fresh installation of vanilla linux-2.6.6 and udev-025 on PC,
where earlier linux-2.4.25 with devfs was installed. Under /udev I find
the following devices:
mousehomenet:/home/rose(124)#ll /udev
total 8
crw-------    1 root     root      14,  12 Jun  6 11:19 adsp
crw-------    1 root     root      10, 175 Jun  6 11:18 agpgart
crw-------    1 root     root      14,   4 Jun  6 11:19 audio
lrwxr-xr-x    1 root     root            3 Jun  6 11:17 cdrom -> hdb
crw-------    1 root     root      10,  63 Jun  6 11:17 device-mapper
crw-------    1 root     root      14,   9 Jun  6 11:18 dmmidi
crw-------    1 root     root      14,   3 Jun  6 11:19 dsp
brw-------    1 root     root       3,  64 Jun  6 11:17 hdb
drwxr-xr-x    2 root     root         4096 Jun  4 10:45 input/
crw-------    1 root     root       6,   0 Jun  6 11:18 lp0
crw-------    1 root     root     226,   0 Jun  6 11:26 mga
crw-------    1 root     root      14,   2 Jun  6 11:18 midi
crw-rw----    1 root     multimedia  14,   0 Jun  6 11:19 mixer
crw-rw----    1 root     multimedia  81,  64 Jun  6 11:18 radio0
crw-------    1 root     root      21,   0 Jun  6 11:19 sg0
...
crw-------    1 root     root      21,   7 Jun  6 11:19 sg7
drwxr-xr-x    2 root     root         4096 Jun  6 11:18 snd/
crw-rw----    1 root     uucp     188,   0 Jun  4 10:45 ttyUSB0
crw-rw----    1 root     multimedia  81, 224 Jun  6 11:18 vbi0
crw-------    1 root     root       7,   1 Jun  6 11:17 vcs1
...
crw-------    1 root     root       7,   8 Jun  4 11:09 vcs8
crw-------    1 root     root       7, 129 Jun  6 11:17 vcsa1
...
crw-------    1 root     root       7, 136 Jun  4 11:09 vcsa8
crw-rw----    1 root     multimedia  81,   0 Jun  6 11:18 video0

After the installation some programs were not running, because they did
not find their devices. E.g. gpm and X did not find /dev/mouse. So I
created manually symlinks:

mousehomenet:/home/rose(127)#ll /dev | grep udev
lrwxr-xr-x    1 root     root           11 Jun  4 19:40 input ->
/udev/input/
lrwxr-xr-x    1 root     multimedia       11 Jun  6 13:02 mixer ->
/udev/mixer
lrwxr-xr-x    1 root     root           18 Jun  6 11:19 mouse ->
/udev/input/mouse1
lrwxr-xr-x    1 root     multimedia       12 Jun  4 20:20 radio0 ->
/udev/radio0
lrwxr-xr-x    1 root     root            9 Jun  4 11:05 snd ->
/udev/snd/
lrwxr-xr-x    1 root     multimedia       10 Jun  6 12:53 vbi0 ->
/udev/vbi0
lrwxr-xr-x    1 root     multimedia       12 Jun  4 20:18 video0 ->
/udev/video0

With exception of the sound of my TV-card everythings seems to work.
But I am not very satisfied with my manual creation of symbolic links.
What is the recommended procedure to make the /udev/* devices accessible
to the application programs? Should I modify my init scripts, that they
are creating links from every entry in /udev into /dev? And what about
devices that are present in /dev/ and /udev, e.g. dsp, hdb, lp0, midi,
sg0-sg7, vcs1-vcs8 and vcsa1-vcsa8? Should I delete the corresponding
entries in /dev/? Or should delete all entries in /dev? But the
essential entries: console, null, rtc, the hard disk entries hd?, hd??,
hd???, sd?, sd??, sd???, etc. are not created in /udev.

	Please give me some hints.
		Juergen


-- 
Juergen Rose <rose@rz.uni-potsdam.de>
University of Potsdam



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