Re: Inappropriate ioctl for device on alsalib with uclibc and arm platform

[Federico Fuga <f.fuga@people.it>]

Takashi Iwai ha scritto:
> At Mon, 19 Nov 2007 16:21:39 +0100,
> Federico Fuga wrote:
> # alsactl restore
> alsactl: set_control:1159: Cannot write control '2:0:0:Speaker Playback
> Volume:0' : Inappropriate ioctl for device
>
> while traceing with strace I see that:
>
> open("/usr/lib/libasound.so.2", O_RDONLY) = 4
> fstat(4, {st_mode=S_IFREG|0755, st_size=716844, ...}) = 0
> close(4)                                = 0
> open("/dev/snd/controlC0", O_RDONLY)    = 4
> close(4)                                = 0
> open("/dev/snd/controlC0", O_RDWR)      = 4
> ioctl(4, USBDEVFS_CONTROL, 0xbeab09ec)  = 0
> ioctl(4, UI_DEV_CREATE, 0xbeab0ad0)     = 0
> ioctl(4, USBDEVFS_CONNECTINFO, 0xbeab0654) = 0
> ioctl(4, USBDEVFS_HUB_PORTINFO, 0xbeab0768) = -1 ENOTTY (Inappropriate
>   
>
> Looks like the definition of SNDRV_CTL_ICOTL_ELEM_WRITE doesn't match
> with the user-space and the kernel, most likely the size of struct
> snd_ctl_elem_value.  This might be a word alignment issue.
>
>   

Hi Takashi,

thank you for your response. I have tracked the problem to the kernel
space and found exactly what you say (structure size). I didn't think
about word alignment, I will try by changeing the gcc options.
Do you think I should look at the cross compiler or at the parameters
passed to gcc while compiling the alsa library?
Thank you very much.

Federico