python: how to close orphaned domain socket from new process -

i planing use domain sockets lock ensure 1 active instance (linux kernel >=2.6).

so, binding domain socket active process , create lock file pid more human-friendly check option in fs.

import socket class processlock(object):     def __init__(self, processname):         self.processname = processname         self.pidfile = os.path.join(self.gettmpdir(),"uid-%s_process-%s.pid" % (os.getuid(), processname) )         ...         self.socket.bind('\0' + self.processname)         ...         atexit.register(self.cleanup)     ...     def cleanup(self):         self.socket.shutdown(socket.shut_rdwr)         self.socket.close()         self.socketok = false         os.remove(self.pidfile) 

it working, managed kill process hard did not close socket @ exit , socket kept open beyond process' lifetime:

> lsof    condorjob 124485        root    4u     unix 0xffff88186c3341c0        0t0  175181414 @testfooname    condorjob 124485        root    5w      reg                8,6          0   13893673 /var/tmp/uid-0_process-testfooname.pid (deleted) 

since have pid file cross-check, close socket (after sanity checking in process tree one). however, cannot bind socket new instance since still bound ~zombie socket.

is there python way close existing unix domain sockets (running pid 0 if necessary)?

it mistake on side. had sent manually process sleep in tab , did not realized despite lsof showing pid. after killing process, kernel closed socket intended. working expected.