Lib/test/test_select.py

   1 # Testing select module
   2 from test.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 try:
  36     rfd, wfd, xfd = select.select([], [], [], 'not a number')
  37 except TypeError:
  38     pass
  39 else:
  40     print 'expected TypeError exception not raised'
  41
  42
  43 def test():
  44     import sys
  45     if sys.platform[:3] in ('win', 'mac', 'os2', 'riscos'):
  46         if verbose:
  47             print "Can't test select easily on", sys.platform
  48         return
  49     cmd = 'for i in 0 1 2 3 4 5 6 7 8 9; do echo testing...; sleep 1; done'
  50     p = os.popen(cmd, 'r')
  51     for tout in (0, 1, 2, 4, 8, 16) + (None,)*10:
  52         if verbose:
  53             print 'timeout =', tout
  54         rfd, wfd, xfd = select.select([p], [], [], tout)
  55         if (rfd, wfd, xfd) == ([], [], []):
  56             continue
  57         if (rfd, wfd, xfd) == ([p], [], []):
  58             line = p.readline()
  59             if verbose:
  60                 print repr(line)
  61             if not line:
  62                 if verbose:
  63                     print 'EOF'
  64                 break
  65             continue
  66         print 'Unexpected return values from select():', rfd, wfd, xfd
  67     p.close()
  68
  69 test()