[alsa-devel] ioctl(fd, SNDRV_CTL_IOCTL_ELEM_REPLACE, ... not working from userspace ?

[Fulup Ar Foll]

Clement,

Are sure about this ?

The ioctl is called from /src/control/control_hw.c inside 
snd_ctl_hw_elem_replace and this is for hardware controls.

At kernel level the iotcl point onto ./sound/core/control.c and calls 
snd_ctl_elem_add_user(ctl, argp, 1) that itself calls snd_ctl_elem_add

Looking at this code I do not understand why the replace iotcl is 
refused. Nevertheless it seems more to come from some lacking data in ly 
ctrlinfo than because of access right (I'm testing as root)

Fulup

On 03/07/17 16:29, Clemens Ladisch wrote:
> Fulup Ar Foll wrote:
>> I try to rename existing sound control from userspace.
> 
> This is allowed only for user controls, i.e., controls that were added
> from userspace.
> 
> 
> Regards,
> Clemens
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