On Wed, 05 Jan 2022 16:56:47 +0100, Vinod Koul wrote:

Hi Daniel,

On 05-01-22, 16:31, Daniel Baluta wrote:

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Hi all,

Is there any quick document for handling Ctrl + Z with aplay/cplay?

cplay does have have handler for it, patches would be welcome :)

...

I don't see this signal handled with alsa-lib or tinycompress although linux kernel offers PAUSE/RESUME ioctls.

Are you sure, I checked with aplay, it seems to me work for me on Fedora

$ aplay test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono ^Z [1]+ Stopped aplay test.wav

It did pause the file and I was able to resume it from the last position.

FWIW: $ aplay --version aplay: version 1.2.6 by Jaroslav Kysela perex@perex.cz

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What should be the expected behavior?

Pause the stream should be apt behaviour, unless Takashi or Jaroslav have better ideas

There is no special handling in alsa-lib or aplay program itself about this signal; it's just "paused" by the terminal, so no data is fed. And, after the resume, it deals with the standard XRUN error handling.

That said, it's a sort of XRUN injection. (IIRC, someone explicitly requested to keep this "feature" in axfr, too.)

Takashi