While developing cd_burn plugin i needed to read child output in
non-blocking mode in order to parse the output of the child app in
realtime without locking my thread.
After a few attempts i finally got it. Here is the "recipe" for who ever
needs it:
import fcntl, os
def run_my_child(self,cmd=None,cwd=None,wait=0):
cmd = cmd + " 2>&1"
child_app = util.popen3.Popen3(cmd,cwd=cwd)
if wait:
self.makeNonBlocking(child_app.fromchild.fileno())
while child_app.poll() < 0:
try:
while 1:
line = child_app.fromchild.readline()
if line:
print line
else:
break
except IOError:
#the fd was not ready to read
pass
time.sleep(1)
return child_app
def makeNonBlocking(self,fd):
fl = fcntl.fcntl(fd, fcntl.F_GETFL)
try:
fcntl.fcntl(fd, fcntl.F_SETFL, fl | os.O_NDELAY)
except AttributeError:
fcntl.fcntl(fd, fcntl.F_SETFL, fl | fcntl.FNDELAY)
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