Daniel Viksporre wrote:

I opened a MIDI connection with...

snd_rawmidi_open(&read_handle, &write_handle, "virtual", 0);

But how do i set a useful name on it, that can be seen in other programs?

You don't.

The RawMIDI API was designed for 'real' hardware devices, which already have a name.

To create a virtual MIDI port, you should use the sequencer API.

Regards, Clemens