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sound: pcm: record a substream's owner process

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Record the pid of the task that opened a PCM substream. For sound
cards with hardware mixing, this allows determining which process
is associated with a specific substream's volume control.

Signed-off-by: Clemens Ladisch <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Clemens Ladisch 2009-11-10 10:13:30 +01:00 • committed by Takashi Iwai
commit e7373b702f
2 changed files with 7 additions and 0 deletions
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3
include/sound/pcm.h
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@ -348,6 +348,8 @@ struct snd_pcm_group { /* keep linked substreams */
int count;
};
struct pid;
struct snd_pcm_substream {
struct snd_pcm *pcm;
struct snd_pcm_str *pstr;
@ -379,6 +381,7 @@ struct snd_pcm_substream {
atomic_t mmap_count;
unsigned int f_flags;
void (*pcm_release)(struct snd_pcm_substream *);
struct pid *pid;
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
/* -- OSS things -- */
struct snd_pcm_oss_substream oss;