subprocess to C program

[Aaron Brady]

On Dec 13, 7:51 pm, Grant Edwards <gra... at visi.com> wrote:
> On 2008-12-14, MRAB <goo... at mrabarnett.plus.com> wrote:
>
>
>
> >> I am writing a C process and I want to read data from a file that I
> >> write to in Python.  I'm creating a pipe in Python, passing it to the
> >> C process, and calling '_read'.  It gives me error 9, bad file number.
snip
> >> meaning that 'ct' is -1, 'readfd' is 3, and 'errno' is 9.  I want 'ct'
> >> to be 11 at this point.  Thanks in advance.
>
> > It looks like the ids aren't system global.
>
> They certainly aren't in Unix: Their a property of the process.
>
> --
> Grant

I'm not on Unix.  It has to be possible somehow.  Do I need to set
permissions on the IDs?  Are Stdin and Stdout my only options?  Or
does Popen prevent sharing IDs somehow?