[Discuss-gnuradio] Pipe Tricks

[cswiger]

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