Showing content from http://svn.python.org/projects/python/branches/r22rc1-branch/Lib/test/test_fcntl.py below:
#! /usr/bin/env python """Test program for the fcntl C module. Roger E. Masse """ import struct import fcntl import os, sys from test_support import verbose, TESTFN filename = TESTFN try: os.O_LARGEFILE except AttributeError: start_len = "ll" else: start_len = "qq" if sys.platform in ('netbsd1', 'Darwin1.2', 'darwin', 'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5', 'bsdos2', 'bsdos3', 'bsdos4', 'openbsd', 'openbsd2'): lockdata = struct.pack('lxxxxlxxxxlhh', 0, 0, 0, fcntl.F_WRLCK, 0) elif sys.platform in ['aix3', 'aix4', 'hp-uxB', 'unixware7']: lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0) else: lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0) if verbose: print 'struct.pack: ', `lockdata` # the example from the library docs f = open(filename, 'w') rv = fcntl.fcntl(f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK) if verbose: print 'Status from fnctl with O_NONBLOCK: ', rv rv = fcntl.fcntl(f.fileno(), fcntl.F_SETLKW, lockdata) if verbose: print 'String from fcntl with F_SETLKW: ', `rv` f.close() os.unlink(filename) # Again, but pass the file rather than numeric descriptor: f = open(filename, 'w') rv = fcntl.fcntl(f, fcntl.F_SETFL, os.O_NONBLOCK) rv = fcntl.fcntl(f, fcntl.F_SETLKW, lockdata) f.close() os.unlink(filename)
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