October 4th, 2004, 02:56 AM
detecting socket in use on localhost
I am looking for some code to detect whether or not there is already a listener to a socket (tcp or udp) on the localhost.
I am writing some software that can be run multiple times on a localhost and each will instantiate a listener within a known range of ports. I have checked several resources (Cookbook, Python Network Programming (Goerzen), Programming Python(Lutz)) but cannot find the crux.
Anyone care to point me to some nice methods?
October 4th, 2004, 02:14 PM
You could always use try...except like this:
You could check errno at the exception handler and see if it is the value for socket already in use (in my case, the value is 48)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error, (errno, strerror):
print "Error code(%d), Error Message: %s " % (errno, strerror)
print "Unknown error"
Up the Irons
What Would Jimi Do? Smash amps. Burn guitar. Take the groupies home.
"Death Before Dishonour, my Friends!!" - Bruce D ickinson, Iron Maiden Aug 20, 2005 @ OzzFest
Down with Sharon Osbourne
"I wouldn't hire a butcher to fix my car. I also wouldn't hire a marketing firm to build my website." - Nilpo