Hi, I'm querying a list of network servers for processes belonging to a
specific user. The problem is that when I try to read the stdout from the
subprocess it sometimes hangs. Not always though.
I thought maybe I needed to set unbufferered to true, so at the beginning of
the code I set
os.environ['PYTHONUNBUFFERED'] = '1'
But I think it's more likely the subprocess that needs to be unbuffered.
Here's the bit of code:
---------------------------
for machine_name in self.alive:# a list of servers that responded to
ping already.
cmd = ["/bin/remsh", machine_name, 'ps -flu %s' % uid]
finish = time.time() + 4.0
p = subprocess.Popen(cmd,stdout=subprocess.PIPE)
while p.poll() is None:
time.sleep(0.5)
if finish < time.time():
p.kill()
print 'skipping' # this works ok
break
s = ''
if p:
s = p.stdout.read() # trhis will hang occasionally
if not s:
continue
---------------------------
Any ideas? comments on code welcome also.
thanks,
--Tim Arnold
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