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[ALSA] Add O_APPEND flag support to PCM

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Added O_APPEND flag support to PCM to enable shared substreams
among multiple processes.  This mechanism is used by dmix and
dsnoop plugins.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2006-04-28 15:13:41 +02:00
committed by Jaroslav Kysela
parent f001c3acf6
commit 0df63e44c3
8 changed files with 99 additions and 45 deletions
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5
include/sound/pcm.h
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@@ -368,7 +368,8 @@ struct snd_pcm_substream {
struct snd_pcm_group *group; /* pointer to current group */
/* -- assigned files -- */
void *file;
struct file *ffile;
int ref_count;
unsigned int f_flags;
void (*pcm_release)(struct snd_pcm_substream *);
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
/* -- OSS things -- */
@@ -387,7 +388,7 @@ struct snd_pcm_substream {
unsigned int hw_opened: 1;
};
#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
struct snd_pcm_str {