[gentoo-user] /dev/snd/seq access mode and permission

[gentoo-user] /dev/snd/seq access mode and permission

[Cinder]

Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/

total 0
drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
crw-------  1 root root  116,  1 Aug 17 18:44 seq
crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer

I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.


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Re: [gentoo-user] /dev/snd/seq access mode and permission

[Alan McKinnon]

On Fri, 17 Aug 2012 01:54:34 -0700
Cinder <cinder@linuxwaves.com> wrote:

> Hi, how do I make changes to permissions and access mode of device
> nodes persistent? At the moment I have to chown and chmod
> the /dev/snd/seq node every boot to make it accessible to my user.
> the other nodes are fine. Here's the output of ls -l /dev/snd/
> 
> total 0
> drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> crw-------  1 root root  116,  1 Aug 17 18:44 seq
> crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
> 
> I need /dev/snd/seq to look look the others. I can't find the udev
> rule or configuration that creates these nodes. Many thanks for any
> consideration.

If there's no explicit rule, then it's automagic. But you can still
additionally tell udev how to set the mode and owner. Here's an
example, Google knows more (this stuff does seem to change quite a lot):

http://www.reactivated.net/writing_udev_rules.html#ownership
-- 
Alan McKinnon
alan.mckinnon@gmail.com

Re: [gentoo-user] /dev/snd/seq access mode and permission

[Marc Joliet]

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Am Fri, 17 Aug 2012 01:54:34 -0700
schrieb Cinder <cinder@linuxwaves.com>:

> Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/
> 
> total 0
> drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> crw-------  1 root root  116,  1 Aug 17 18:44 seq
> crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
> 
> I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.

I have a hack for the same issue in my /etc/local.d/. A comment I put there
says this:

# this is caused by using devtmpfs, which creates nodes with root:root and 600;
# I believe this is fixed by udev upstream

So devtmpfs creates the device node before udev runs, but udev does not correct
the access permissions, which is however fixed by udev upstream (perhaps
already in ~arch?). Sadly I do not remember where I read this, but google should
be of help there.

HTH
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

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Re: [gentoo-user] /dev/snd/seq access mode and permission

[Canek Peláez Valdés]

On Fri, Aug 17, 2012 at 3:54 AM, Cinder <cinder@linuxwaves.com> wrote:
> Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/
>
> total 0
> drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> crw-------  1 root root  116,  1 Aug 17 18:44 seq
> crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
>
> I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.

Do you have files under /etc/udev/rules.d/? If so, make a backup of
them, delete them, and try again. udev should automagically set the
permissions.

Also, check for orphan files (files which doesn't belong to any
package) under /lib/udev/rules.d/

Regards.
-- 
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México

Re: [gentoo-user] /dev/snd/seq access mode and permission

[Marc Joliet]

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Am Fri, 17 Aug 2012 11:40:47 +0200
schrieb Marc Joliet <marcec@gmx.de>:

> Am Fri, 17 Aug 2012 01:54:34 -0700
> schrieb Cinder <cinder@linuxwaves.com>:
> 
> > Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/
> > 
> > total 0
> > drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> > crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> > crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> > crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> > crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> > crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> > crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> > crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> > crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> > crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> > crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> > crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> > crw-------  1 root root  116,  1 Aug 17 18:44 seq
> > crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
> > 
> > I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.
> 
> I have a hack for the same issue in my /etc/local.d/. A comment I put there
> says this:
> 
> # this is caused by using devtmpfs, which creates nodes with root:root and 600;
> # I believe this is fixed by udev upstream
> 
> So devtmpfs creates the device node before udev runs, but udev does not correct
> the access permissions, which is however fixed by udev upstream (perhaps
> already in ~arch?). Sadly I do not remember where I read this, but google should
> be of help there.

Ah, yes, I did a quick search on b.g.o and found this:

  https://bugs.gentoo.org/show_bug.cgi?id=406871

So my comment is wrong, it doesn't have anything to do with devtmpfs, but udev
upstream did fix it :) .

HTH
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

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Re: [gentoo-user] /dev/snd/seq access mode and permission

[Cinder]

I have tried creating this rule:

/etc/udev/rules.d/40-seq.rules
   KERNEL=="snd/seq",      GROUP="audio", MODE="0666"

...but I'm not sure about the kernel key pair. I have tried matching "/dev/snd/seq" and just "seq"
aswell.

The Bug 406871 for sys-fs/udev-171-r5 looks exactly right, butI have sys-fs/udev-171-r6 installed. I''l check my kernel config and try disabling tmpfs. I have read that it helps real time audio performanc with jack(audio-connection-kit)though.

I have tried removing all the rules in /etc/udev/rules.d. but the mode and permissions on /dev/snd/seq persist.

Thanks for everyones help.

--- marcec@gmx.de wrote:

From: Marc Joliet <marcec@gmx.de>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] /dev/snd/seq access mode and permission
Date: Fri, 17 Aug 2012 21:20:08 +0200

Am Fri, 17 Aug 2012 11:40:47 +0200
schrieb Marc Joliet <marcec@gmx.de>:

> Am Fri, 17 Aug 2012 01:54:34 -0700
> schrieb Cinder <cinder@linuxwaves.com>:
> 
> > Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/
> > 
> > total 0
> > drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> > crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> > crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> > crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> > crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> > crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> > crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> > crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> > crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> > crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> > crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> > crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> > crw-------  1 root root  116,  1 Aug 17 18:44 seq
> > crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
> > 
> > I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.
> 
> I have a hack for the same issue in my /etc/local.d/. A comment I put there
> says this:
> 
> # this is caused by using devtmpfs, which creates nodes with root:root and 600;
> # I believe this is fixed by udev upstream
> 
> So devtmpfs creates the device node before udev runs, but udev does not correct
> the access permissions, which is however fixed by udev upstream (perhaps
> already in ~arch?). Sadly I do not remember where I read this, but google should
> be of help there.

Ah, yes, I did a quick search on b.g.o and found this:

  https://bugs.gentoo.org/show_bug.cgi?id=406871

So my comment is wrong, it doesn't have anything to do with devtmpfs, but udev
upstream did fix it :) .

HTH
-- 
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup




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Re: [gentoo-user] /dev/snd/seq access mode and permission

[Bill Kenworthy]

Try this (my "fix" is in /lib/udev/rules.d/40-gentoo.rules):


moriah ~ # equery f udev
 * Searching for udev ...
 * Contents of sys-fs/udev-171-r6:
/etc
/etc/conf.d
/etc/conf.d/udev
/etc/init.d
...
/lib/udev/rules.d
/lib/udev/rules.d/30-kernel-compat.rules
/lib/udev/rules.d/40-gentoo.rules   
/lib/udev/rules.d/42-qemu-usb.rules 
/lib/udev/rules.d/50-firmware.rules 
/lib/udev/rules.d/50-udev-default.rules
/lib/udev/rules.d/60-cdrom_id.rules 
/lib/udev/rules.d/60-floppy.rules   
/lib/udev/rules.d/60-persistent-alsa.rules
/lib/udev/rules.d/60-persistent-input.rules
...


moriah ~ # grep snd /lib/udev/rules.d/*
/lib/udev/rules.d/40-gentoo.rules:SUBSYSTEM=="snd",     GROUP="audio"
/lib/udev/rules.d/50-udev-default.rules:KERNEL=="seq",                  GROUP="audio", MODE="0660", OPTIONS+="static_node=snd/seq"
/lib/udev/rules.d/50-udev-default.rules:KERNEL=="timer",                GROUP="audio", MODE="0660", OPTIONS+="static_node=snd/timer"
/lib/udev/rules.d/60-persistent-alsa.rules:ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="?*", SYMLINK+="snd/by-id/$env{ID_BUS}-$env{ID_SERIAL}-$env{ID_IFACE}"
/lib/udev/rules.d/60-persistent-alsa.rules:ENV{ID_SERIAL}=="?*", ENV{ID_IFACE}=="", SYMLINK+="snd/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
/lib/udev/rules.d/60-persistent-alsa.rules:ENV{ID_PATH}=="?*", SYMLINK+="snd/by-path/$env{ID_PATH}"
moriah ~ # 

BillK


On Wed, 2012-08-22 at 20:35 -0700, Cinder wrote:
> I have tried creating this rule:
> 
> /etc/udev/rules.d/40-seq.rules
>    KERNEL=="snd/seq",      GROUP="audio", MODE="0666"
> 
> ...but I'm not sure about the kernel key pair. I have tried matching "/dev/snd/seq" and just "seq"
> aswell.
> 
> The Bug 406871 for sys-fs/udev-171-r5 looks exactly right, butI have sys-fs/udev-171-r6 installed. I''l check my kernel config and try disabling tmpfs. I have read that it helps real time audio performanc with jack(audio-connection-kit)though.
> 
> I have tried removing all the rules in /etc/udev/rules.d. but the mode and permissions on /dev/snd/seq persist.
> 
> Thanks for everyones help.
> 
> --- marcec@gmx.de wrote:
> 
> From: Marc Joliet <marcec@gmx.de>
> To: gentoo-user@lists.gentoo.org
> Subject: Re: [gentoo-user] /dev/snd/seq access mode and permission
> Date: Fri, 17 Aug 2012 21:20:08 +0200
> 
> Am Fri, 17 Aug 2012 11:40:47 +0200
> schrieb Marc Joliet <marcec@gmx.de>:
> 
> > Am Fri, 17 Aug 2012 01:54:34 -0700
> > schrieb Cinder <cinder@linuxwaves.com>:
> > 
> > > Hi, how do I make changes to permissions and access mode of device nodes persistent? At the moment I have to chown and chmod the /dev/snd/seq node every boot to make it accessible to my user. the other nodes are fine. Here's the output of ls -l /dev/snd/
> > > 
> > > total 0
> > > drwxr-xr-x  2 root root       60 Aug 17 18:44 by-path
> > > crw-rw----+ 1 root audio 116, 12 Aug 17 18:44 controlC0
> > > crw-rw----+ 1 root audio 116, 11 Aug 17 18:44 hwC0D0
> > > crw-rw----+ 1 root audio 116, 10 Aug 17 18:44 hwC0D3
> > > crw-rw----+ 1 root audio 116,  9 Aug 17 18:44 hwC0D4
> > > crw-rw----+ 1 root audio 116,  8 Aug 17 18:44 hwC0D5
> > > crw-rw----+ 1 root audio 116,  7 Aug 17 18:44 pcmC0D0c
> > > crw-rw----+ 1 root audio 116,  6 Aug 17 18:44 pcmC0D0p
> > > crw-rw----+ 1 root audio 116,  5 Aug 17 18:44 pcmC0D1p
> > > crw-rw----+ 1 root audio 116,  4 Aug 17 18:44 pcmC0D3p
> > > crw-rw----+ 1 root audio 116,  3 Aug 17 18:44 pcmC0D7p
> > > crw-rw----+ 1 root audio 116,  2 Aug 17 18:44 pcmC0D8p
> > > crw-------  1 root root  116,  1 Aug 17 18:44 seq
> > > crw-rw----+ 1 root audio 116, 33 Aug 17 18:44 timer
> > > 
> > > I need /dev/snd/seq to look look the others. I can't find the udev rule or configuration that creates these nodes. Many thanks for any consideration.
> > 
> > I have a hack for the same issue in my /etc/local.d/. A comment I put there
> > says this:
> > 
> > # this is caused by using devtmpfs, which creates nodes with root:root and 600;
> > # I believe this is fixed by udev upstream
> > 
> > So devtmpfs creates the device node before udev runs, but udev does not correct
> > the access permissions, which is however fixed by udev upstream (perhaps
> > already in ~arch?). Sadly I do not remember where I read this, but google should
> > be of help there.
> 
> Ah, yes, I did a quick search on b.g.o and found this:
> 
>   https://bugs.gentoo.org/show_bug.cgi?id=406871
> 
> So my comment is wrong, it doesn't have anything to do with devtmpfs, but udev
> upstream did fix it :) .
> 
> HTH