How to tell if a forked process is done?

John Lin joseph at ugcs.caltech.edu
Wed Sep 24 01:47:40 CEST 2003


Howdy,

I want to know how to tell if a forked process is done.

Actually, my real question is that I want to run a shell script inside
of a python script, and after the shell script has finished running, I
want to do more stuff *condition* on the fact that the shell script
has finished running, inside the same python script.

The only way I can think of is to fork a process and then call the
shell script, as in:
  pid = os.fork()
  if pid == 0:
    os.execl(shellscript_name.sh, "")
but how can I know if the shell script is finished?

In sum, my two questions are:
1.  How can I know if a forked shell script is finished?
2.  How can I run a shell script inside a python script without
forking a new process, so that I can know the shell script is done
from within the same python script?

thanks in advance,

John




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