Re: System file-descriptors of pipe file-ids?

[Muthiah Annamalai]

On 6/22/07, Olaf Till <address@hidden> wrote:
> Hi,
>
> I want to make a select() call on pipes created with Octaves
> interpreted pipe() function. So I need the systems file-descriptors of
> these pipes.
>
> As I had to learn it seems to be difficult to get file-descriptors of
> c++ streams.
>
> But pipes probably have been created with a system call, so their
> file-descriptors must get available somewhere inside Octave, before
> they are used to create the streams for the pipe.
>
> Are the pipes file-descriptors recorded and is their a way to access
> them, given the stream-ids returned by the interpreted pipe() command?
>
> Olaf

I remember having to use the file descriptors from within Octave and
to subtract 1 from the returned value for some reason, after serious
'strace'-ing
on the program. Im not sure I have bits of that code sticking around.