Lib/test/test_select.py

   1 # Testing select module
   2 from test_support import verbose
   3 import select
   4 import os
   5
   6 # test some known error conditions
   7 try:
   8     rfd, wfd, xfd = select.select(1, 2, 3)
   9 except TypeError:
  10     pass
  11 else:
  12     print 'expected TypeError exception not raised'
  13
  14 class Nope:
  15     pass
  16
  17 class Almost:
  18     def fileno(self):
  19         return 'fileno'
  20
  21 try:
  22     rfd, wfd, xfd = select.select([Nope()], [], [])
  23 except TypeError:
  24     pass
  25 else:
  26     print 'expected TypeError exception not raised'
  27
  28 try:
  29     rfd, wfd, xfd = select.select([Almost()], [], [])
  30 except TypeError:
  31     pass
  32 else:
  33     print 'expected TypeError exception not raised'
  34
  35
  36 def test():
  37         import sys
  38         if sys.platform[:3] in ('win', 'mac', 'os2'):
  39                 if verbose:
  40                         print "Can't test select easily on", sys.platform
  41                 return
  42         cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
  43         p = os.popen(cmd, 'r')
  44         for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
  45                 if verbose:
  46                         print 'timeout =', tout
  47                 rfd, wfd, xfd = select.select([p], [], [], tout)
  48                 if (rfd, wfd, xfd) == ([], [], []):
  49                         continue
  50                 if (rfd, wfd, xfd) == ([p], [], []):
  51                         line = p.readline()
  52                         if verbose:
  53                                 print `line`
  54                         if not line:
  55                                 if verbose:
  56                                         print 'EOF'
  57                                 break
  58                         continue
  59                 print 'Unexpected return values from select():', rfd, wfd, xfd
  60         p.close()
  61
  62 test()
  63