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snd_pcm_poll_descriptors_revents() may return any error code; the ALSA docs do not constrain the permitted values. A 'hw' device will only ever return an error if the pfd array passed in is invalid (-EINVAL), but other I/O plugins may return arbitary errors. For example a network-based device may return -EPIPE etc. The resulting exception thrown by AlsaNonBlockPcm::DispatchSockets() must be caught to prevent the mpd process from being aborted.
Music Player Daemon
A daemon for playing music of various formats. Music is played through the server's audio device. The daemon stores info about all available music, and this info can be easily searched and retrieved. Player control, info retrieval, and playlist management can all be managed remotely.
For basic installation instructions read the manual.
Users
Developers
Legal
MPD is released under the GNU General Public License version 2, which is distributed in the COPYING file.