/Lib/test/test_fcntl.py
http://unladen-swallow.googlecode.com/ · Python · 105 lines · 85 code · 4 blank · 16 comment · 7 complexity · 2d418ecc5f6702d42f37fa33d7d6c25c MD5 · raw file
- """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 self.f and 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_fcntl_64_bit(self):
- # Issue #1309352: fcntl shouldn't fail when the third arg fits in a
- # C 'long' but not in a C 'int'.
- try:
- cmd = fcntl.F_NOTIFY
- # This flag is larger than 2**31 in 64-bit builds
- flags = fcntl.DN_MULTISHOT
- except AttributeError:
- # F_NOTIFY or DN_MULTISHOT unavailable, skipping
- return
- fd = os.open(os.path.dirname(os.path.abspath(TESTFN)), os.O_RDONLY)
- try:
- fcntl.fcntl(fd, cmd, flags)
- finally:
- os.close(fd)
- def test_main():
- run_unittest(TestFcntl)
- if __name__ == '__main__':
- test_main()