Processes and their childs

[Markus Franz]

Hi!


Inside a Python script (I use Python 2.4) several different child
processes are created by using os.fork().

My problem: I want only the parent process to print some output and
then create the child processes. But even If I use print BEFORE using
os.fork, everything that was printed by the parent process untill this
point is printed by every child process again. How can I avoid this?

Does anybody habe a solution for my problem???
Thanks.


Markus

 

[Jeff Epler]

"flush" your files before forking.

For me, this program gives the correct output 'hello\n' when correct=1.
When correct=0, I get either 'hello\nhello' or 'hellohello\n' as output.

------------------------------------------------------------------------
correct = 0
import sys, os
sys.stdout.write('hello')
if correct: sys.stdout.flush()
if os.fork() == 0: sys.stdout.write('\n')
------------------------------------------------------------------------

Jeff

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