Attempts to perform an exclusive, non-blocking lock on an open file handle to each file in a directory.

lock_files_in_directory.py

#!/usr/bin/env python
import traceback
import fcntl
import sys
import os

try:
    d, = sys.argv[1:]
except ValueError:
    print 'Usage: %s <directory>' % sys.argv[0]
    sys.exit(1)

for name in os.listdir(d):
    path = os.path.join(d, name)
    print 'Locking %s:' % path,
    f = open(path, 'a+')
    try:
        fcntl.flock(f, fcntl.LOCK_NB|fcntl.LOCK_EX)
        fcntl.flock(f, fcntl.LOCK_UN)
        print 'SUCCESS'
    except:
        #traceback.print_exc()
        print 'FAILED'
    finally:
        f.close()