Flush stdin

Dan Stromberg drsalists at gmail.com
Tue Oct 21 00:52:51 CEST 2014


If I run the following in one tty:
    nc -l localhost 9000 | /tmp/z

...where /tmp/z has just:
    #!/usr/bin/python3

    import sys

    for line in sys.stdin.buffer:
        print(line)

And then run the following in another tty on the same computer:
    while read line; do echo $line; sleep 1; done < /etc/passwd | nc
localhost 9000

...then everything acts line buffered, or perhaps even character
buffered (the two are pretty indistinguishable in this test).  What I
see is my /etc/passwd file popping out of the nc -l side, one line at
a time, each line one second apart.

I suppose this suggests that it's the client that's sending TCP data
that is buffering.

That, or we're using two different versions of netcat (there are at
least two available).



More information about the Python-list mailing list