On Tue, 12 Feb 2002, Taybin Rutkin wrote:
> I'm sending this message on behalf of Paul Davis.
>
> ---------- Forwarded message ----------
> Date: Tue, 12 Feb 2002 15:08:56 -0500
> From: Paul Davis <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: control switch API/code change?
>
> [ TAYBIN: for some reason, i can't send mail to alsa-devel right now.
> Could you forward this for me? Thanks. ]
>
> the code below used to work just fine with an older version of
> 0.9.X. i just upgraded to current CVS, and found that it now causes a
> segfault by overwriting h->driver->ctl_handle, apparently before we
> even get to the first snd_ctl_elem_read().
>
> for clarity, h->driver->ctl_handle is a snd_ctl_t previously opened
> successfully and correctly initialized on entry to this code.
>
> does this ring any bells in anyone's head about changes in the control
> interface code?
Strange. I have no clue, there were no changes in the control API. Paul,
could you try '[EMAIL PROTECTED]' e-mail for the alsa-devel
mailing list?
>
> --p
>
>
> static void *
> hammerfall_monitor_controls (void *arg)
>
> {
> jack_hardware_t *hw = (jack_hardware_t *) arg;
> hammerfall_t *h = (hammerfall_t *) hw->private;
> snd_ctl_elem_id_t *switch_id[3];
> snd_ctl_elem_value_t *sw[3];
>
> pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
>
> snd_ctl_elem_id_malloc (&switch_id[0]);
> snd_ctl_elem_id_malloc (&switch_id[1]);
> snd_ctl_elem_id_malloc (&switch_id[2]);
>
> snd_ctl_elem_value_malloc (&sw[0]);
> snd_ctl_elem_value_malloc (&sw[1]);
> snd_ctl_elem_value_malloc (&sw[2]);
>
> set_control_id (switch_id[0], "ADAT1 Sync Check");
> set_control_id (switch_id[1], "ADAT2 Sync Check");
> set_control_id (switch_id[2], "ADAT3 Sync Check");
>
> snd_ctl_elem_value_set_id (sw[0], switch_id[0]);
> snd_ctl_elem_value_set_id (sw[1], switch_id[1]);
> snd_ctl_elem_value_set_id (sw[2], switch_id[2]);
>
> while (1) {
> if (snd_ctl_elem_read (h->driver->ctl_handle, sw[0])) {
> jack_error ("cannot read control switch 0 ...");
> }
> hammerfall_check_sync (h, sw[0]);
>
> if (snd_ctl_elem_read (h->driver->ctl_handle, sw[1])) {
> jack_error ("cannot read control switch 0 ...");
> }
> hammerfall_check_sync (h, sw[1]);
>
> if (snd_ctl_elem_read (h->driver->ctl_handle, sw[2])) {
> jack_error ("cannot read control switch 0 ...");
> }
> hammerfall_check_sync (h, sw[2]);
>
> if (nanosleep (&h->monitor_interval, 0)) {
> break;
> }
> }
>
> pthread_exit (0);
> }
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
SuSE Linux http://www.suse.com
ALSA Project http://www.alsa-project.org
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