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//usr/lib/python2.4/test/test_fcntl.py
#! /usr/bin/env python2.4 """Test program for the fcntl C module. OS/2+EMX doesn't support the file locking operations. Roger E. Masse """ import struct import fcntl import os, sys from test.test_support import verbose, TESTFN filename = TESTFN try: os.O_LARGEFILE except AttributeError: start_len = "ll" else: start_len = "qq" if sys.platform.startswith('atheos'): start_len = "qq" if sys.platform in ('netbsd1', 'netbsd2', 'Darwin1.2', 'darwin', 'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5', 'freebsd6', 'bsdos2', 'bsdos3', 'bsdos4', 'openbsd', 'openbsd2', 'openbsd3'): if struct.calcsize('l') == 8: off_t = 'l' pid_t = 'i' else: off_t = 'lxxxx' pid_t = 'l' lockdata = struct.pack(off_t+off_t+pid_t+'hh', 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) elif sys.platform in ['os2emx']: lockdata = None else: lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0) if lockdata: if verbose: print 'struct.pack: ', repr(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 fcntl with O_NONBLOCK: ', rv if sys.platform not in ['os2emx']: rv = fcntl.fcntl(f.fileno(), fcntl.F_SETLKW, lockdata) if verbose: print 'String from fcntl with F_SETLKW: ', repr(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) if sys.platform not in ['os2emx']: rv = fcntl.fcntl(f, fcntl.F_SETLKW, lockdata) f.close() os.unlink(filename)