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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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sound/usb/usx2y/usx2yhwdeppcm.c
+1 -1
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@@ -632,7 +632,7 @@ static int usX2Y_pcms_lock_check(struct snd_card *card)
for (s = 0; s < 2; ++s) {
struct snd_pcm_substream *substream;
substream = pcm->streams[s].substream;
if (substream && substream->ffile != NULL)
if (SUBSTREAM_BUSY(substream))
err = -EBUSY;
}
}