On Wed, 05 Jan 2022 16:56:47 +0100, Vinod Koul wrote: > > Hi Daniel, > > On 05-01-22, 16:31, Daniel Baluta wrote: > > 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@xxxxxxxx> > > > 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
