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Top Forums UNIX for Dummies Questions & Answers How do you check whether a port currently being used? Post 302296467 by rajesh08 on Wednesday 11th of March 2009 06:52:34 AM
Old 03-11-2009
How do you check whether a port currently being used?

Hi,

Please help me out, how to check whether a port currently being used or not.
is there any command which give the result?

Thanks
Rajesh
 

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PMIDI(1)                                                      General Commands Manual                                                     PMIDI(1)

NAME
pmidi - A midi file player for ALSA. SYNOPSIS
pmidi [ -pclient:port ] [ -l ] [ -ddelay ] file... DESCRIPTION
The pmidi command reads in the specified midi files and plays them through the ALSA sequencer. You can specify on the command line which sequencer port that you wish to use. Use the -l option to get a list of possible sequencer ports for your machine. OPTIONS -pclient:port Specify the ALSA port to send the midi file to. -l List the possible output ports that could be used. -ddelay Delay after song ends. This is used to prevent the last note of a song being chopped off early. The default is two seconds. Port numbers You can specify client:port numbers in the ALSA_OUTPUT_PORTS environment variable. You can also supply a comma (or space if quoted cor- rectly) separated list of client:port numbers. This will allow you to play midi files that use more than 16 channels. Examples pmidi song.mid song2.mid pmidi -p "64:0, 64:1" song.mid TROUBLE SHOOTING
Before you start you need to have ALSA installed and configured correctly. This man page cannot cover all general ALSA topics, but here are a few things to check when things do not seem to be working. Checking ALSA 1. First check that the correct sequencer modules are loaded for your sound card: - For a card with an external Midi connection, you need to load snd-seq-midi. - For the OPL2/3 internal synthesiser you need to load snd-synth-opl3. - For the AWE32/64 internal synthesiser you need to load snd-synth-emu8000. - For the SB Live! internal synthesiser you need to load snd-synth-emu10k1. - (Let me know of any more) 2a If you have an AWE32/64 or SB Live! you will need to load the sounds with sfxload in the same way as for the standard kernel drivers. 2b If you have the OPL3 FM synthesiser you will have to load the FM instruments with sbiload. See note below. 3. Make sure that the synth in the mixer is turned up and unmuted if appropriate. Before use Because you may have more than one sound card and each sound card may have several MIDI connections, you have to tell pmidi which one to use. First find out what the possibilities are for your system: If you run: pmidi -l it will give you a list of the possible devices that it can play to. On my system I get: Port Client name Port name 64:0 Rawmidi 0 - EMU10K1 MPU-401 (U EMU10K1 MPU - 401 (UART) 65:0 Emu10k1 WaveTable Emu10k1 Port 0 65:1 Emu10k1 WaveTable Emu10k1 Port 1 65:2 Emu10k1 WaveTable Emu10k1 Port 2 65:3 Emu10k1 WaveTable Emu10k1 Port 3 128:0 FLUID Synth (28152) Synth input port (28152) 129:0 Client-129 TiMidity port 0 129:1 Client-129 TiMidity port 1 Any of the port numbers in the first column can be used with pmidi. In the example above the first one is the external Midi port, the next four are the internal wave table synthesiser. Then there are two software synthesisers running, FluidSynth (http://www.fluidsynth.org) and Timididy. If you don't see anything listed then check that the correct ALSA modules are loaded as in the section "Checking ALSA". ENVIRONMENT
ALSA_OUTPUT_PORTS Port to use in playing midi file. SEE ALSO
playmidi(1) AUTHOR
Steve Ratcliffe <steve@parabola.demon.co.uk> Dec 20 2003 PMIDI(1)
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