# Testing select module

from test.test_support import verbose, reap_children

import select

import os

# test some known error conditions

try:

    rfd, wfd, xfd = select.select(1, 2, 3)

except TypeError:

    pass

else:

    print 'expected TypeError exception not raised'

class Nope:

    pass

class Almost:

    def fileno(self):

        return 'fileno'

try:

    rfd, wfd, xfd = select.select([Nope()], [], [])

except TypeError:

    pass

else:

    print 'expected TypeError exception not raised'

try:

    rfd, wfd, xfd = select.select([Almost()], [], [])

except TypeError:

    pass

else:

    print 'expected TypeError exception not raised'

try:

    rfd, wfd, xfd = select.select([], [], [], 'not a number')

except TypeError:

    pass

else:

    print 'expected TypeError exception not raised'

def test():

    import sys

    if sys.platform[:3] in ('win', 'mac', 'os2', 'riscos'):

        if verbose:

            print "Can't test select easily on", sys.platform

        return

    cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'

    p = os.popen(cmd, 'r')

    for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:

        if verbose:

            print 'timeout =', tout

        rfd, wfd, xfd = select.select([p], [], [], tout)

        if (rfd, wfd, xfd) == ([], [], []):

            continue

        if (rfd, wfd, xfd) == ([p], [], []):

            line = p.readline()

            if verbose:

                print repr(line)

            if not line:

                if verbose:

                    print 'EOF'

                break

            continue

        print 'Unexpected return values from select():', rfd, wfd, xfd

    p.close()

    reap_children()

test()