On Thu, Feb 03, 2011 at 06:58:26PM -0700, Todd Millecam wrote:
> Here's the actual code. It pauses immediately after reaching the main
> loop--but after any input is recieved it enters an infinite loop.
I saw that you posted a workaround about running readline().
Unfortunately, readline blocks until it can read a whole line, so it
usually doesn't pair well with a select loop. Stdin is usually line
buffered, but I don't think the pipe from Popen necessarily is.
One thing you might want to fix: your class is running main() from
__init__(). I would recommend limiting the constructor to just
initializing the object. Whoever creates a mineServer can call the main
method. In fact, I would probably even put the Popen call into main(),
too.
Anyway, I copy-and-pasted your code and then made some minor changes so
that I could run it. I ended up with the following code, which I ran
with "cat /etc/group |python hello.py". Unfortunately, I was not able
to reproduce the problem that you described. I really am curious about
this issue, so let me know if you can find any other info.
import select
import subprocess
import sys
class MineServer(object):
def __init__(self):
#Start the server process
self.SP = subprocess.Popen(['cat', '/etc/passwd'],
stdout=subprocess.PIPE, stdin=subprocess.PIPE,
stderr=subprocess.PIPE)
def main(self):
files = [sys.stdin, self.SP.stdout, self.SP.stderr]
while files:
inputReady, outputready, exceptReady = select.select(
files, [], [], 1)
for IO in inputReady:
line = IO.read(80)
print 'line: "%s"' % line
if not line:
IO.close()
files.remove(IO)
if __name__ == '__main__':
s = MineServer()
s.main()
--
Andrew McNabb
http://www.mcnabbs.org/andrew/
PGP Fingerprint: 8A17 B57C 6879 1863 DE55 8012 AB4D 6098 8826 6868
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