Windows' PID re-use not considered in Process.ppid, Process.parent, at least in process_info.c:get_ppid()

[giampaolo]

From clackw...@googlemail.com on March 12, 2013 05:07:30

Looking at process_info.c, get_ppid() it seems that it does not consider PID 
reuse, because it does not check if the found process has a creation time 
smaller than or equal to the current process.

As a workaround: If process.parent returns a Process reference the creation 
time of that process should be checked to ensure that the parent process is 
older than or as old as the process (a sub-process can have the same creation 
timestamp as its parent process, IIRC what a colleague once reported):

def my_get_ppid(process):
    pp = process.parent
    if pp is not None:
        # Check if parent process is younger than
        # process:
        if pp.create_time > process.create_time:
            return None
    return pp.pid

def my_get_parent(process):
    if my_get_ppid(process) is not None:
        return process.parent
    return None

Possibly related issue: https://code.google.com/p/psutil/issues/detail?id=314

Original issue: http://code.google.com/p/psutil/issues/detail?id=356

[giampaolo]

From g.rodola on April 11, 2013 03:59:06

Fixed in revision 25aff1ab8dbc .
Thanks.

Status: FixedInHG
Labels: Milestone-0.7.0

[giampaolo]

From g.rodola on April 12, 2013 11:21:27

Status: Fixed