cpython/Lib/dos-8x3/test_fcn.py

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#! /usr/bin/env python
"""Test program for the fcntl C module.
Roger E. Masse
"""
import struct
import fcntl
import FCNTL
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import os, sys
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from test_support import verbose
filename = '/tmp/delete-me'
# the example from the library docs
f = open(filename,'w')
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rv = fcntl.fcntl(f.fileno(), FCNTL.F_SETFL, os.O_NONBLOCK)
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if verbose:
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print 'Status from fnctl with O_NONBLOCK: ', rv
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if sys.platform in ('netbsd1',
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'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5',
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'bsdos2', 'bsdos3', 'bsdos4',
'openbsd', 'openbsd2'):
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lockdata = struct.pack('lxxxxlxxxxlhh', 0, 0, 0, FCNTL.F_WRLCK, 0)
elif sys.platform in ['aix3', 'aix4']:
lockdata = struct.pack('hhlllii', FCNTL.F_WRLCK, 0, 0, 0, 0, 0, 0)
else:
lockdata = struct.pack('hhllhh', FCNTL.F_WRLCK, 0, 0, 0, 0, 0)
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if verbose:
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print 'struct.pack: ', `lockdata`
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rv = fcntl.fcntl(f.fileno(), FCNTL.F_SETLKW, lockdata)
if verbose:
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print 'String from fcntl with F_SETLKW: ', `rv`
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f.close()
os.unlink(filename)