Daemon stops if device is busy

[ik666]

Background:

I have MPD and SPOP running on the same server maschine. Both daemons are using ALSA, sharing the hardware audio device.

Working Secenario:

• play a song with MPD
• stop playing with MPD
• start playing a song with SPOP (play command)
• stop playing with SPOP (stop command)
• start playing with MPD

Not working scenario:

• play a song with MPD (while song is still playing)
• start playing a song with SPOP (play command)
• SPOP daemon quits (see log)

Requirement / possible solution:

• if an audio device is busy, the SPOP daemon should not stop
• if an audio device is busy, the SPOP daemon should inform the caller in the response message about the issue (to unblock the audio device prior to calling a SPOP play function).

SPOP-Log:

Okt 05 08:00:10 music spopd[19810]: ao_alsa ERROR: Unable to open ALSA device 'default' for playback => Device or resource busy
Okt 05 08:00:10 music spopd[19810]: 2014-10-05 08:00:10 [ERR ] Error while opening libao device: Cannot open the device
Okt 05 08:00:10 music systemd[1]: spop.service: main process exited, code=killed, status=5/TRAP
Okt 05 08:00:10 music systemd[1]: Unit spop.service entered failed state.

[Schnouki]

Agreed, an audio device error should not cause the demon to exit.

[ning-yu]

I'd like to add +1 for this issue :)