Re: [Discuss-gnuradio] Pipe Tricks

[James Cooley]

I had a similar thing.... I was using sockets, but then got it to work.

Are you sure the fd is staying in scope for the duration of the run?

-jamie




cswiger wrote:

> Trying
>
>  pipe_fd = open("/pipe","r")
>  gr.file_descriptor_source(gr.sizeof_char,pipe_fd.fileno())
>
> starts out but as soon as I start the source to fill the pipe
> I get:
>
>  file_descriptor_source[read]: Bad file descriptor
>
> and the pipe filling script reports IOError: [Errno 32] Broken pipe
>
> BTW, opening and reading the pipe manually in python works ok:
>  
>
> > > > fd=open("/pipe","r")
> > > > a=fd.read(5)
> > > > a
> > > >        
> '\xaa\xaa\xaa\xaa\xaa'
>
>
> where \xaa is the expected idle character read w/o having to close
> the pipe at the source. Again, using gr.file_source(pipe) works
> fine but only after the source closes the pipe. Oh, and yes there
> is fd.flush() after ever fd.write(chr(c)) in the source script.
>
> --Chuck
>
>
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