[alsa-devel] [PATCH v2 3/3] Show sequencer sound card numer/PID via aconnect

[Takashi Iwai]

On Wed, 02 Mar 2016 19:26:27 +0100,
Martin Koegler wrote:
> 
> From: Martin Koegler <martin.koegler at chello.at>
> 
> rawmidi devices expose the card number via IOCTLs, which allows to
> find the corresponding device in sysfs.
> 
> The sequencer provides no identifing data. Chromium works around this
> issue by scanning rawmidi as well as sequencer devices and matching
> them by using assumtions, how the kernel register sequencer devices.
> 
> This patch adds support for displaying the sound card number/PID to
> aconnect.
> 
> Signed-off-by: Martin Koegler <martin.koegler at chello.at>

This patch alone would break the build if alsa-utils is built against
the alsa-lib without your patch.  So some check is needed.


Takashi

> ---
>  seq/aconnect/aconnect.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/seq/aconnect/aconnect.c b/seq/aconnect/aconnect.c
> index 8d6cebb..d299f5c 100644
> --- a/seq/aconnect/aconnect.c
> +++ b/seq/aconnect/aconnect.c
> @@ -166,11 +166,22 @@ static void print_port(snd_seq_t *seq, snd_seq_client_info_t *cinfo,
>  		       snd_seq_port_info_t *pinfo, int count)
>  {
>  	if (! count) {
> -		printf(_("client %d: '%s' [type=%s]\n"),
> +		int card, pid;
> +
> +		printf(_("client %d: '%s' [type=%s"),
>  		       snd_seq_client_info_get_client(cinfo),
>  		       snd_seq_client_info_get_name(cinfo),
>  		       (snd_seq_client_info_get_type(cinfo) == SND_SEQ_USER_CLIENT ?
>  			_("user") : _("kernel")));
> +
> +		card = snd_seq_client_info_get_card(cinfo);
> +		if (card != -1)
> +			printf(",card=%d", card);
> +
> +		pid = snd_seq_client_info_get_pid(cinfo);
> +		if (pid != -1)
> +			printf(",pid=%d", pid);
> +		printf("]\n");
>  	}
>  	printf("  %3d '%-16s'\n",
>  	       snd_seq_port_info_get_port(pinfo),
> -- 
> 2.1.4
> 
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