Re: [OctDev] isunix() returns 1 under cygwin

[Quentin Spencer]

William Poetra Yoga Hadisoeseno wrote:

> On 12/27/05, Andy Adler <address@hidden> wrote:
>  
>
> > The semantics of 'isunix' depends on what you mean by UNIX.
> > Strictly speaking, only certain well defined OSes are UNIX. Linux,
> > for example, is not.
> >
> > On the other hand, maybe UNIX means OSes that behave like
> > UNIX in most ways. cygwin has UNIX process semantics
> > (ie. fork) and file semantics (symlinks, select on files, etc.)
> >
> > So, is cygwin UNIX? Clearly, a mingwin octave is not unix.
> >
> > Maybe isunix should make a specific test.
> >
> >    
>
> In Octave 2.9.4, isunix() is implemented as
>
> function retval = isunix ()
>
>  if (nargin == 0)
>    retval = octave_config_info ("unix");
>  else
>    usage ("isunix ()");
>  endif
>
> endfunction
>
> AFAIK, it returns 1 on Cygwin (I know this by reading the sources, so
> I'm not very sure)
>
>  


If you look at the contents of octave_config_info, I think there are 
other things you could use to extract the system type. On my linux box, 
I see "unix = 1" and "windows = 0". I'm guessing that under cygwin you 
get "unix = 1" and "windows = 1", so maybe testing 
octave_config_info("windows") will always give you the correct answer 
whether octave was built in cygwin or mingw. If all else fails, you 
could try parsing octave_config_info("canonical_host_type"), which 
usually contains "linux" on linux systems and "cygwin" (if I remember 
correctly) on cygwin.

-Quentin



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