Open Sound System
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The OSS MIDI loopback driver (midiloop) is a special driver that implements a pipe between two MIDI device files. The MIDI_CAP_CLIENT capability is used to mark devices that are client side ends of such pipes.
This capability is only interesting to internal OSS utilities like ossinfo. Other applications should avoid checking this capability. It's pointless because client side MIDI devices will work exactly in the same way than any "ordinary" MIDI devices.
MIDI device capabilities like MIDI_CAP_CLIENT can be checked using the SNDCTL_MIDIINFO ioctl call.