Python wait until data is in sys.stdin

Question

my problem is the following:

My pythons script receives data via sys.stdin, but it needs to wait until new data is available on sys.stdin.

As described in th

Answer 1

This works for me, code of /tmp/alog.py:

#! /usr/bin/python

import sys

fout = open("/tmp/alog.log", "a")

while True:
    dat = sys.stdin.readline()
    fout.write(dat)
    fout.flush()

in http.conf:

CustomLog "|/tmp/alog.py" combined

The key is don't use

for dat in sys.stdin:

You will wait there get nothing. And for testing, remember fout.flush(), otherwise you may not see output. I test on fedora 15, python 2.7.1, Apache 2.2, not cpu load, alog.py will exists in memory, if you ps you can see it.