mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2026-02-04 04:06:26 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

seq: return back old snd_seq_drain_output behaviour for -EAGAIN

Browse source 
It seems that many applications did not follow the documentation
including pyalsa sequencer module, thus return the previous
behaviour and correct documentation.

Closes: https://github.com/alsa-project/alsa-lib/issues/493
Fixes: b97a11ec ("seq: fix snd_seq_drain_output return value for partial drain")
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2026-01-13 08:09:47 +01:00
parent 63a981865a
commit 805464c7bd
1 changed files with 3 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/seq/seq.c
View file

@ -4431,8 +4431,7 @@ int snd_seq_event_output_pending(snd_seq_t *seq)
* \brief drain output buffer to sequencer
* \param seq sequencer handle
* \return 0 when all events are drained and sent to sequencer.
* When events still remain on the buffer, the byte size of remaining
* events are returned. On error a negative error code is returned.
* On error a negative error code is returned (including -EAGAIN).
*
* This function drains all pending events on the output buffer.
* The function returns immediately after the events are sent to the queues
@ -4444,19 +4443,15 @@ int snd_seq_event_output_pending(snd_seq_t *seq)
*/
int snd_seq_drain_output(snd_seq_t *seq)
{
ssize_t result, processed = 0;
ssize_t result;
assert(seq);
while (seq->obufused > 0) {
result = seq->ops->write(seq, seq->obuf, seq->obufused);
if (result < 0) {
if (result == -EAGAIN && processed > 0)
return seq->obufused;
if (result < 0)
return result;
}
if ((size_t)result < seq->obufused)
memmove(seq->obuf, seq->obuf + result, seq->obufused - result);
seq->obufused -= result;
processed += result;
}
return 0;
}