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Catching CTRL-C inside .oct file?

From: John W. Eaton
Subject: Catching CTRL-C inside .oct file?
Date: Wed, 15 Apr 1998 00:06:32 -0500 (CDT)

On 15-Apr-1998, Erik de Castro Lopo <address@hidden> wrote:

| I'm writing a .oct file to allow the playing of a vector 
| thru the sound card (/dev/dsp) as an audio file.
| It works something like:
| octave > soundplay (fs, mono)
| or
| octave > soundplay (fs, leftchannel, rightchannel)
| where fs is the sampling frequency. This of course would
| be really useful for anybody doing research in the areas
| of sound or speech.

Why do you need to do this inside a .oct file?  What features are
missing that prevent an effective .m file implementation?

| Anyway, I need to be able to trap the Ctrl-C signal so I can 
| clean up before exiting. Is this possible inside an .oct file?

You should be able to use the function octave_set_sighandler (see
sighandlers.{h,cc}) to catch signals in .oct files.

| Is it possible inside a .m file?

There is currently no way to trap signals directly within Octave
code, but I do have some plans to add a new built-in variable similar
to perl's SIG variable that will allow you to specify a list of
functions to call when various signals are caught.  Suggestions for
how to make a feature like this more useful are welcome.  Code to
actually do it would also be nice :-).



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