On a Slackware 9.1 box, I'm trying to detect if mpg123 is currently
running/playing a song so that when the song is done, it'll play the next
in the list. The problem is that popen'ing ps doesn't always give a
correct return. My function is below and I added a second check that runs
1 second later which sometimes works, sometimes doesn't.
Here's my function:
def pid_defunct():
#1 = defunct processes
#2 = show is currently playing
#0 = no mpg123 processes found
t = os.popen( "ps axc | grep '[mpg123] <defunct>'" ).read()
if len(t) > 0:
return 1
else:
t = os.popen( "ps axc | grep 'mpg123'" ).read()
if len(t) > 0:
return 2
else:
print "Check 1: mpg123 is dead"
#Check twice, because popen doesn't always return
#correct value
time.sleep(1)
t = os.popen( "ps axc | grep 'mpg123'" ).read()
if len(t) > 0:
print "Check 1 was wrong"
return 2
else:
print "Check 2: mpg123 is dead"
return 0
This function is run during each iteration of a loop with a time.sleep(1)
executed right before it. Is there a better way to make this work?
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