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215 lines
7.4 KiB
215 lines
7.4 KiB
2 years ago
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"""Test program for the fcntl C module.
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"""
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import platform
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import os
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import struct
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import sys
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import unittest
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from multiprocessing import Process
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from test.support import verbose, cpython_only
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from test.support.import_helper import import_module
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from test.support.os_helper import TESTFN, unlink
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# Skip test if no fcntl module.
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fcntl = import_module('fcntl')
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def get_lockdata():
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try:
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os.O_LARGEFILE
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except AttributeError:
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start_len = "ll"
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else:
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start_len = "qq"
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if (sys.platform.startswith(('netbsd', 'freebsd', 'openbsd'))
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or sys.platform == 'darwin'):
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if struct.calcsize('l') == 8:
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off_t = 'l'
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pid_t = 'i'
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else:
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off_t = 'lxxxx'
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pid_t = 'l'
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lockdata = struct.pack(off_t + off_t + pid_t + 'hh', 0, 0, 0,
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fcntl.F_WRLCK, 0)
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elif sys.platform.startswith('gnukfreebsd'):
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lockdata = struct.pack('qqihhi', 0, 0, 0, fcntl.F_WRLCK, 0, 0)
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elif sys.platform in ['hp-uxB', 'unixware7']:
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lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
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else:
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lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
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if lockdata:
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if verbose:
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print('struct.pack: ', repr(lockdata))
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return lockdata
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lockdata = get_lockdata()
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class BadFile:
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def __init__(self, fn):
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self.fn = fn
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def fileno(self):
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return self.fn
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def try_lockf_on_other_process_fail(fname, cmd):
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f = open(fname, 'wb+')
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try:
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fcntl.lockf(f, cmd)
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except BlockingIOError:
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pass
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finally:
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f.close()
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def try_lockf_on_other_process(fname, cmd):
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f = open(fname, 'wb+')
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fcntl.lockf(f, cmd)
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fcntl.lockf(f, fcntl.LOCK_UN)
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f.close()
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class TestFcntl(unittest.TestCase):
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def setUp(self):
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self.f = None
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def tearDown(self):
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if self.f and not self.f.closed:
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self.f.close()
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unlink(TESTFN)
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def test_fcntl_fileno(self):
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# the example from the library docs
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self.f = open(TESTFN, 'wb')
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rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
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if verbose:
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print('Status from fcntl with O_NONBLOCK: ', rv)
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rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETLKW, lockdata)
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if verbose:
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print('String from fcntl with F_SETLKW: ', repr(rv))
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self.f.close()
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def test_fcntl_file_descriptor(self):
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# again, but pass the file rather than numeric descriptor
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self.f = open(TESTFN, 'wb')
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rv = fcntl.fcntl(self.f, fcntl.F_SETFL, os.O_NONBLOCK)
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if verbose:
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print('Status from fcntl with O_NONBLOCK: ', rv)
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rv = fcntl.fcntl(self.f, fcntl.F_SETLKW, lockdata)
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if verbose:
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print('String from fcntl with F_SETLKW: ', repr(rv))
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self.f.close()
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def test_fcntl_bad_file(self):
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with self.assertRaises(ValueError):
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fcntl.fcntl(-1, fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(ValueError):
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fcntl.fcntl(BadFile(-1), fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(TypeError):
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fcntl.fcntl('spam', fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(TypeError):
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fcntl.fcntl(BadFile('spam'), fcntl.F_SETFL, os.O_NONBLOCK)
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@cpython_only
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def test_fcntl_bad_file_overflow(self):
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from _testcapi import INT_MAX, INT_MIN
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# Issue 15989
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with self.assertRaises(OverflowError):
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fcntl.fcntl(INT_MAX + 1, fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(OverflowError):
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fcntl.fcntl(BadFile(INT_MAX + 1), fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(OverflowError):
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fcntl.fcntl(INT_MIN - 1, fcntl.F_SETFL, os.O_NONBLOCK)
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with self.assertRaises(OverflowError):
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fcntl.fcntl(BadFile(INT_MIN - 1), fcntl.F_SETFL, os.O_NONBLOCK)
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@unittest.skipIf(
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platform.machine().startswith('arm') and platform.system() == 'Linux',
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"ARM Linux returns EINVAL for F_NOTIFY DN_MULTISHOT")
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def test_fcntl_64_bit(self):
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# Issue #1309352: fcntl shouldn't fail when the third arg fits in a
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# C 'long' but not in a C 'int'.
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try:
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cmd = fcntl.F_NOTIFY
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# This flag is larger than 2**31 in 64-bit builds
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flags = fcntl.DN_MULTISHOT
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except AttributeError:
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self.skipTest("F_NOTIFY or DN_MULTISHOT unavailable")
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fd = os.open(os.path.dirname(os.path.abspath(TESTFN)), os.O_RDONLY)
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try:
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fcntl.fcntl(fd, cmd, flags)
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finally:
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os.close(fd)
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def test_flock(self):
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# Solaris needs readable file for shared lock
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self.f = open(TESTFN, 'wb+')
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fileno = self.f.fileno()
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fcntl.flock(fileno, fcntl.LOCK_SH)
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fcntl.flock(fileno, fcntl.LOCK_UN)
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fcntl.flock(self.f, fcntl.LOCK_SH | fcntl.LOCK_NB)
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fcntl.flock(self.f, fcntl.LOCK_UN)
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fcntl.flock(fileno, fcntl.LOCK_EX)
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fcntl.flock(fileno, fcntl.LOCK_UN)
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self.assertRaises(ValueError, fcntl.flock, -1, fcntl.LOCK_SH)
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self.assertRaises(TypeError, fcntl.flock, 'spam', fcntl.LOCK_SH)
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@unittest.skipIf(platform.system() == "AIX", "AIX returns PermissionError")
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def test_lockf_exclusive(self):
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self.f = open(TESTFN, 'wb+')
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cmd = fcntl.LOCK_EX | fcntl.LOCK_NB
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fcntl.lockf(self.f, cmd)
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p = Process(target=try_lockf_on_other_process_fail, args=(TESTFN, cmd))
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p.start()
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p.join()
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fcntl.lockf(self.f, fcntl.LOCK_UN)
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self.assertEqual(p.exitcode, 0)
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@unittest.skipIf(platform.system() == "AIX", "AIX returns PermissionError")
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def test_lockf_share(self):
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self.f = open(TESTFN, 'wb+')
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cmd = fcntl.LOCK_SH | fcntl.LOCK_NB
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fcntl.lockf(self.f, cmd)
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p = Process(target=try_lockf_on_other_process, args=(TESTFN, cmd))
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p.start()
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p.join()
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fcntl.lockf(self.f, fcntl.LOCK_UN)
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self.assertEqual(p.exitcode, 0)
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@cpython_only
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def test_flock_overflow(self):
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import _testcapi
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self.assertRaises(OverflowError, fcntl.flock, _testcapi.INT_MAX+1,
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fcntl.LOCK_SH)
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@unittest.skipIf(sys.platform != 'darwin', "F_GETPATH is only available on macos")
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def test_fcntl_f_getpath(self):
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self.f = open(TESTFN, 'wb')
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expected = os.path.abspath(TESTFN).encode('utf-8')
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res = fcntl.fcntl(self.f.fileno(), fcntl.F_GETPATH, bytes(len(expected)))
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self.assertEqual(expected, res)
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@unittest.skipUnless(
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hasattr(fcntl, "F_SETPIPE_SZ") and hasattr(fcntl, "F_GETPIPE_SZ"),
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"F_SETPIPE_SZ and F_GETPIPE_SZ are not available on all platforms.")
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def test_fcntl_f_pipesize(self):
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test_pipe_r, test_pipe_w = os.pipe()
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try:
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# Get the default pipesize with F_GETPIPE_SZ
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pipesize_default = fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ)
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pipesize = pipesize_default // 2 # A new value to detect change.
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if pipesize < 512: # the POSIX minimum
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raise unittest.SkitTest(
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'default pipesize too small to perform test.')
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fcntl.fcntl(test_pipe_w, fcntl.F_SETPIPE_SZ, pipesize)
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self.assertEqual(fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ),
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pipesize)
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finally:
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os.close(test_pipe_r)
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os.close(test_pipe_w)
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if __name__ == '__main__':
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unittest.main()
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