"""Test program for the fcntl C module.

OS/2+EMX doesn't support the file locking operations.

"""

import fcntl

import os

import struct

import sys

import unittest

from test.test_support import verbose, TESTFN, unlink, run_unittest

# TODO - Write tests for flock() and lockf().

def get_lockdata():

    if sys.platform.startswith('atheos'):

        start_len = "qq"

    else:

        try:

            os.O_LARGEFILE

        except AttributeError:

            start_len = "ll"

        else:

            start_len = "qq"

    if sys.platform in ('netbsd1', 'netbsd2', 'netbsd3',

                        'Darwin1.2', 'darwin',

                        'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5',

                        'freebsd6', 'freebsd7', 'freebsd8',

                        'bsdos2', 'bsdos3', 'bsdos4',

                        'openbsd', 'openbsd2', 'openbsd3', 'openbsd4'):

        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)

    return lockdata

lockdata = get_lockdata()

class TestFcntl(unittest.TestCase):

    def setUp(self):

        self.f = None

    def tearDown(self):

        if not self.f.closed:

            self.f.close()

        unlink(TESTFN)

    def test_fcntl_fileno(self):

        # the example from the library docs

        self.f = open(TESTFN, 'w')

        rv = fcntl.fcntl(self.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(self.f.fileno(), fcntl.F_SETLKW, lockdata)

            if verbose:

                print 'String from fcntl with F_SETLKW: ', repr(rv)

        self.f.close()

    def test_fcntl_file_descriptor(self):

        # again, but pass the file rather than numeric descriptor

        self.f = open(TESTFN, 'w')

        rv = fcntl.fcntl(self.f, fcntl.F_SETFL, os.O_NONBLOCK)

        if sys.platform not in ['os2emx']:

            rv = fcntl.fcntl(self.f, fcntl.F_SETLKW, lockdata)

        self.f.close()

def test_main():

    run_unittest(TestFcntl)

if __name__ == '__main__':

    test_main()