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Re: Flush stdin

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On Fri, 17 Oct 2014 12:38:54 +0100, Empty Account wrote:

> I am using netcat to listen to a port and python to read stdin and print
> to the console.
> 
> nc -l 2003 | python print_metrics.py
> 
> sys.stdin.flush() doesn’t seem to flush stdin,

You can't "flush" an input stream.

> so I am using the termios module.

> I am receiving this exception
> termios.error: (25, 'Inappropriate ioctl for device')

termios only works on terminals, not pipes.

It's a safe bet that your problem is that "nc" isn't flushing its stdout
after each line (this is the default behaviour for stdio streams which
don't correspond to a terminal).

Check whether "nc" has a flag to line-buffer its output. If it doesn't,
the simplest solution is probably to write a Python script which creates a
pseudo-tty (using the "pty" module) and executes "nc" with its stdout
associated with the pty.

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Thread

Flush stdin Empty Account <emptya45@gmail.com> - 2014-10-17 12:38 +0100
  Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-18 17:55 +0100
    Re: Flush stdin Tim Chase <python.list@tim.thechases.com> - 2014-10-18 12:32 -0500
      Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-19 02:11 +0100
        Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-18 18:34 -0700
        Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-18 18:42 -0700
          Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-22 03:49 +0100
            Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-21 20:11 -0700
    Re: Flush stdin MRAB <python@mrabarnett.plus.com> - 2014-10-18 18:55 +0100
    Re: Flush stdin Cameron Simpson <cs@zip.com.au> - 2014-10-19 08:01 +1100
    Re: Flush stdin Terry Reedy <tjreedy@udel.edu> - 2014-10-18 18:35 -0400

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