Lib.test.test_fileno.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
"""Test file descriptor operations
Made for Jython.
"""
import errno
import os
import sys
import tempfile
import test.test_support as test_support
import unittest
class TestFilenoTestCase(unittest.TestCase):
def setUp(self):
self.filename = tempfile.mktemp()
self.fp = open(self.filename, 'w+')
self.fd = self.fp.fileno()
def tearDown(self):
if self.fp:
self.fp.close()
os.remove(self.filename)
def test_ftruncate(self):
self.fp.write('jython filenos')
self.fp.flush()
os.fsync(self.fd)
self.assertEqual(os.path.getsize(self.filename), 14)
os.ftruncate(self.fd, 8)
self.assertEqual(os.path.getsize(self.filename), 8)
os.ftruncate(self.fd, 0)
self.assertEqual(os.path.getsize(self.filename), 0)
self.fp.close()
raises(OSError, 9, os.ftruncate, self.fd, 0)
def test_lseek(self):
self.assertEqual(os.lseek(self.fd, 0, 1), 0)
os.write(self.fd, 'jython filenos')
os.lseek(self.fd, 7, 0)
self.assertEqual(os.read(self.fd, 7), 'filenos')
self.fp.close()
raises(OSError, 9, os.lseek, self.fd, 0, 1)
def test_read(self):
self.fp.write('jython filenos')
self.fp.flush()
self.fp.seek(0)
result = os.read(self.fd, 7)
self.assertTrue(isinstance(result, str))
self.assertEqual(result, 'jython ')
self.assertEqual(os.read(self.fd, 99), 'filenos')
self.fp.close()
raises(OSError, 9, os.read, self.fd, 1)
def test_write(self):
os.write(self.fd, 'jython filenos')
self.fp.seek(0)
self.assertEqual(self.fp.read(), 'jython filenos')
self.fp.close()
raises(OSError, 9, os.write, self.fd, 'The Larch')
class TestOsOpenTestCase(unittest.TestCase):
def setUp(self):
self.filename = tempfile.mktemp()
self.dir = None
self.fd = None
def tearDown(self):
if self.fd:
try:
os.close(self.fd)
except:
pass
if os.path.exists(self.filename):
os.remove(self.filename)
if self.dir:
os.rmdir(self.dir)
def test_open(self):
# XXX: assert the mode of the file
self.fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT)
self.assert_(os.path.exists(self.filename))
os.write(self.fd, 'jython')
os.close(self.fd)
self.fd = os.open(self.filename, os.O_WRONLY | os.O_APPEND)
os.write(self.fd, ' filenos')
os.close(self.fd)
fp = open(self.filename)
self.assertEquals(fp.read(), 'jython filenos')
fp.close()
# falls back to read only without O_WRONLY/O_RDWR
self.fd = os.open(self.filename, os.O_APPEND)
raises(OSError, 9, os.write, self.fd, 'new')
# Acts as append on windows (seeks to the end)
os.lseek(self.fd, 0, 0)
self.assertEquals(os.read(self.fd, len('jython filenos')), 'jython filenos')
os.close(self.fd)
# falls back to read only without O_WRONLY/O_RDWR
self.fd = os.open(self.filename, os.O_CREAT)
raises(OSError, 9, os.write, self.fd, 'new')
self.assertEquals(os.read(self.fd, len('jython filenos')), 'jython filenos')
os.close(self.fd)
# interpreted as RDWR
self.fd = os.open(self.filename, os.O_RDONLY | os.O_RDWR)
os.write(self.fd, 'test')
os.lseek(self.fd, 0, 0)
self.assertEquals(os.read(self.fd, 4), 'test')
os.close(self.fd)
def test_open_truncate(self):
fp = open(self.filename, 'w')
fp.write('hello')
fp.close()
self.assertEquals(os.path.getsize(self.filename), 5)
self.fd = os.open(self.filename, os.O_TRUNC | os.O_RDWR)
self.assertEquals(os.path.getsize(self.filename), 0)
os.write(self.fd, 'truncated')
os.lseek(self.fd, 0, 0)
self.assertEquals(os.read(self.fd, len('truncated')), 'truncated')
os.close(self.fd)
self.fd = os.open(self.filename, os.O_TRUNC | os.O_WRONLY)
self.assertEquals(os.path.getsize(self.filename), 0)
os.write(self.fd, 'write only truncated')
raises(OSError, 9, os.read, self.fd, 99)
os.close(self.fd)
fd = open(self.filename)
self.assertEquals(fd.read(), 'write only truncated')
fd.close()
# Both fail on Windows, errno 22
"""
# falls back to read only without O_WRONLY/O_RDWR, but truncates
self.fd = os.open(self.filename, os.O_TRUNC)
self.assertEquals(os.path.getsize(self.filename), 0)
raises(OSError, 9, os.write, self.fd, 'new')
self.assertEquals(os.read(self.fd, 99), '')
os.close(self.fd)
fp = open(self.filename, 'w')
fp.write('and ')
fp.close()
self.assertEquals(os.path.getsize(self.filename), 4)
# append with no write falls back to read, but still truncates
self.fd = os.open(self.filename, os.O_TRUNC | os.O_APPEND)
self.assertEquals(os.path.getsize(self.filename), 0)
raises(OSError, 9, os.write, self.fd, 'new')
os.close(self.fd)
fp = open(self.filename, 'w')
fp.write('and ')
fp.close()
self.assertEquals(os.path.getsize(self.filename), 4)
"""
def test_open_exclusive(self):
self.assert_(not os.path.exists(self.filename))
# fails without O_CREAT
raises(OSError, (2, self.filename), os.open, self.filename, os.O_EXCL)
self.assert_(not os.path.exists(self.filename))
# creates, read only
self.fd = os.open(self.filename, os.O_EXCL | os.O_CREAT)
self.assert_(os.path.exists(self.filename))
raises(OSError, 9, os.write, self.fd, 'jython')
self.assertEquals(os.read(self.fd, 99), '')
os.close(self.fd)
# not exclusive unless creating
os.close(os.open(self.filename, os.O_EXCL))
raises(OSError, (17, self.filename),
os.open, self.filename, os.O_CREAT | os.O_EXCL)
raises(OSError, (17, self.filename),
os.open, self.filename, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
raises(OSError, (17, self.filename),
os.open, self.filename, os.O_CREAT | os.O_RDWR | os.O_EXCL)
os.remove(self.filename)
self.fd = os.open(self.filename, os.O_EXCL | os.O_RDWR | os.O_CREAT)
os.write(self.fd, 'exclusive')
os.lseek(self.fd, 0, 0)
self.assertEquals(os.read(self.fd, len('exclusive')), 'exclusive')
def test_open_sync(self):
if not hasattr(os, 'O_SYNC'):
return
# Just ensure this works
self.fd = os.open(self.filename, os.O_SYNC | os.O_WRONLY | os.O_CREAT)
self.assert_(os.path.exists(self.filename))
os.write(self.fd, 'jython')
raises(OSError, 9, os.read, self.fd, 99)
os.close(self.fd)
os.remove(self.filename)
self.fd = os.open(self.filename, os.O_SYNC | os.O_RDWR | os.O_CREAT)
self.assert_(os.path.exists(self.filename))
os.write(self.fd, 'jython')
os.lseek(self.fd, 0, 0)
self.assertEquals(os.read(self.fd, len('jython')), 'jython')
os.close(self.fd)
def test_open_sync_dir(self):
if not hasattr(os, 'O_SYNC'):
return
self.dir = tempfile.mkdtemp()
try:
self.fd = os.open(self.dir, os.O_SYNC | os.O_RDWR)
except OSError, ose:
assert ose.errno == errno.EISDIR, ose.errno
def test_bad_open(self):
for mode in (os.O_WRONLY, os.O_WRONLY, os.O_RDWR):
raises(OSError, (2, self.filename), os.open, self.filename, mode)
open(self.filename, 'w').close()
raises(OSError, (22, self.filename),
os.open, self.filename, os.O_WRONLY | os.O_RDWR)
class TestOsFdopenTestCase(unittest.TestCase):
def setUp(self):
self.filename = tempfile.mktemp()
self.fd = None
def tearDown(self):
if self.fd:
try:
os.close(self.fd)
except:
pass
if os.path.exists(self.filename):
os.remove(self.filename)
def test_fdopen(self):
origw_fp = open(self.filename, 'w')
origw = origw_fp.fileno()
origr_fp = open(self.filename, 'r')
origr = origr_fp.fileno()
# Mode must begin with rwa
raises(ValueError, "invalid file mode 'b'",
os.fdopen, origr, 'b')
# Refuse modes the original file doesn't support
# XXX: allowed on windows CPython
"""
raises(OSError, '[Errno 22] Invalid argument',
os.fdopen, origw, 'r')
raises(OSError, '[Errno 22] Invalid argument',
os.fdopen, origr, 'w')
"""
fp = os.fdopen(origw, 'w')
fp.write('fdopen')
# Windows CPython doesn't raise an exception here
#raises(IOError, '[Errno 9] Bad file descriptor',
# fp.read, 7)
fp.close()
fp = os.fdopen(origr)
self.assertEquals(fp.read(), 'fdopen')
# Windows CPython raises IOError [Errno 0] Error
#raises(IOError, '[Errno 9] Bad file descriptor',
# fp.write, 'test')
raises(IOError, None,
fp.write, 'test')
fp.close()
# Windows CPython raises OSError [Errno 0] Error for both these
#raises(OSError, '[Errno 9] Bad file descriptor',
# os.fdopen, origw, 'w')
#raises(OSError, '[Errno 9] Bad file descriptor',
# os.fdopen, origr, 'r')
raises(OSError, None,
os.fdopen, origw, 'w')
raises(OSError, None,
os.fdopen, origr, 'r')
# These all raise IO/OSErrors on FreeBSD
try:
origw_fp.close()
except:
pass
try:
origr_fp.close()
except:
pass
try:
os.close(origw)
except:
pass
try:
os.close(origr)
except:
pass
def raises(exc, expected, callable, *args):
"""Ensure the specified call raises exc.
expected is compared against the exception message if not None. It
can be a str, an errno or a 2 item tuple of errno/filename. The
latter two being for comparison against EnvironmentErrors.
"""
if expected:
if isinstance(expected, str):
msg = expected
else:
errno = expected[0] if isinstance(expected, tuple) else expected
msg = '[Errno %d] %s' % (errno, os.strerror(errno))
if isinstance(expected, tuple):
msg += ': %r' % expected[1]
try:
callable(*args)
except exc, val:
if expected and str(val) != msg:
raise test_support.TestFailed(
"Message %r, expected %r" % (str(val), msg))
else:
raise test_support.TestFailed("Expected %s" % exc)
def test_main():
test_support.run_unittest(TestFilenoTestCase,
TestOsOpenTestCase,
TestOsFdopenTestCase)
if __name__ == '__main__':
test_main()