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      1 """Test program for the fcntl C module.
      2 
      3 OS/2+EMX doesn't support the file locking operations.
      4 
      5 """
      6 import os
      7 import struct
      8 import sys
      9 import unittest
     10 from test.test_support import (verbose, TESTFN, unlink, run_unittest,
     11     import_module)
     12 
     13 # Skip test if no fnctl module.

     14 fcntl = import_module('fcntl')
     15 
     16 
     17 # TODO - Write tests for flock() and lockf().

     18 
     19 def get_lockdata():
     20     if sys.platform.startswith('atheos'):
     21         start_len = "qq"
     22     else:
     23         try:
     24             os.O_LARGEFILE
     25         except AttributeError:
     26             start_len = "ll"
     27         else:
     28             start_len = "qq"
     29 
     30     if sys.platform in ('netbsd1', 'netbsd2', 'netbsd3',
     31                         'Darwin1.2', 'darwin',
     32                         'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5',
     33                         'freebsd6', 'freebsd7', 'freebsd8',
     34                         'bsdos2', 'bsdos3', 'bsdos4',
     35                         'openbsd', 'openbsd2', 'openbsd3', 'openbsd4'):
     36         if struct.calcsize('l') == 8:
     37             off_t = 'l'
     38             pid_t = 'i'
     39         else:
     40             off_t = 'lxxxx'
     41             pid_t = 'l'
     42         lockdata = struct.pack(off_t + off_t + pid_t + 'hh', 0, 0, 0,
     43                                fcntl.F_WRLCK, 0)
     44     elif sys.platform in ['aix3', 'aix4', 'hp-uxB', 'unixware7']:
     45         lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
     46     elif sys.platform in ['os2emx']:
     47         lockdata = None
     48     else:
     49         lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
     50     if lockdata:
     51         if verbose:
     52             print 'struct.pack: ', repr(lockdata)
     53     return lockdata
     54 
     55 lockdata = get_lockdata()
     56 
     57 
     58 class TestFcntl(unittest.TestCase):
     59 
     60     def setUp(self):
     61         self.f = None
     62 
     63     def tearDown(self):
     64         if self.f and not self.f.closed:
     65             self.f.close()
     66         unlink(TESTFN)
     67 
     68     def test_fcntl_fileno(self):
     69         # the example from the library docs

     70         self.f = open(TESTFN, 'w')
     71         rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
     72         if verbose:
     73             print 'Status from fcntl with O_NONBLOCK: ', rv
     74         if sys.platform not in ['os2emx']:
     75             rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETLKW, lockdata)
     76             if verbose:
     77                 print 'String from fcntl with F_SETLKW: ', repr(rv)
     78         self.f.close()
     79 
     80     def test_fcntl_file_descriptor(self):
     81         # again, but pass the file rather than numeric descriptor

     82         self.f = open(TESTFN, 'w')
     83         rv = fcntl.fcntl(self.f, fcntl.F_SETFL, os.O_NONBLOCK)
     84         if sys.platform not in ['os2emx']:
     85             rv = fcntl.fcntl(self.f, fcntl.F_SETLKW, lockdata)
     86         self.f.close()
     87 
     88     def test_fcntl_64_bit(self):
     89         # Issue #1309352: fcntl shouldn't fail when the third arg fits in a

     90         # C 'long' but not in a C 'int'.

     91         try:
     92             cmd = fcntl.F_NOTIFY
     93             # This flag is larger than 2**31 in 64-bit builds

     94             flags = fcntl.DN_MULTISHOT
     95         except AttributeError:
     96             self.skipTest("F_NOTIFY or DN_MULTISHOT unavailable")
     97         fd = os.open(os.path.dirname(os.path.abspath(TESTFN)), os.O_RDONLY)
     98         try:
     99             fcntl.fcntl(fd, cmd, flags)
    100         finally:
    101             os.close(fd)
    102 
    103 
    104 def test_main():
    105     run_unittest(TestFcntl)
    106 
    107 if __name__ == '__main__':
    108     test_main()
    109