Lib/test/test_fcntl.py

   1 #! /usr/bin/env python
   2 """Test program for the fcntl C module.
   3    Roger E. Masse
   4 """
   5 import struct
   6 import fcntl
   7 import FCNTL
   8 import os, sys
   9 from test_support import verbose, TESTFN
  10
  11 filename = TESTFN
  12
  13 # the example from the library docs
  14 f = open(filename, 'w')
  15 rv = fcntl.fcntl(f.fileno(), FCNTL.F_SETFL, os.O_NONBLOCK)
  16 if verbose:
  17     print 'Status from fnctl with O_NONBLOCK: ', rv
  18
  19 if sys.platform in ('netbsd1', 'Darwin1.2',
  20                     'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5',
  21                     'bsdos2', 'bsdos3', 'bsdos4',
  22                     'openbsd', 'openbsd2'):
  23     lockdata = struct.pack('lxxxxlxxxxlhh', 0, 0, 0, FCNTL.F_WRLCK, 0)
  24 elif sys.platform in ['aix3', 'aix4', 'hp-uxB']:
  25     lockdata = struct.pack('hhlllii', FCNTL.F_WRLCK, 0, 0, 0, 0, 0, 0)
  26 else:
  27     lockdata = struct.pack('hhllhh', FCNTL.F_WRLCK, 0, 0, 0, 0, 0)
  28 if verbose:
  29     print 'struct.pack: ', `lockdata`
  30
  31 rv = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW, lockdata)
  32 if verbose:
  33     print 'String from fcntl with F_SETLKW: ', `rv`
  34
  35 f.close()
  36 os.unlink(filename)