jack plugin closes stdin if jack is unavailable
jack plugin closes stdin if jack is unavailable

the jack plugin closes stdin if the pcm interfaces is opened but jack
isn't running. Initializing the file descriptors to -1 fixes the problem.

From: Mikael Magnusson <1a8a40f077231fe3701f308aef5b6966b2723cb5@gmail.com>

Themaister/alsa-plugins-rsound,Distrotech/alsa-plugins,Distrotech/alsa-plugins,Distrotech/alsa-plugins