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#! /usr/bin/env python
"""Test program for the fcntl C module.
OS/2+EMX doesn't support the file locking operations.
Roger E. Masse
"""
import struct
import fcntl
import os, sys
from test.test_support import verbose, TESTFN
filename = TESTFN
try:
os.O_LARGEFILE
except AttributeError:
start_len = "ll"
else:
start_len = "qq"
if sys.platform.startswith('atheos'):
start_len = "qq"
if sys.platform in ('netbsd1', 'netbsd2', 'netbsd3',
'Darwin1.2', 'darwin',
'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5',
'freebsd6', 'freebsd7',
'bsdos2', 'bsdos3', 'bsdos4',
'openbsd', 'openbsd2', 'openbsd3', 'openbsd4'):
if struct.calcsize('l') == 8:
off_t = 'l'
pid_t = 'i'
else:
off_t = 'lxxxx'
pid_t = 'l'
lockdata = struct.pack(off_t+off_t+pid_t+'hh', 0, 0, 0, fcntl.F_WRLCK, 0)
elif sys.platform in ['aix3', 'aix4', 'hp-uxB', 'unixware7']:
lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
elif sys.platform in ['os2emx']:
lockdata = None
else:
lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
if lockdata:
if verbose:
print('struct.pack: ', repr(lockdata))
# the example from the library docs
f = open(filename, 'w')
rv = fcntl.fcntl(f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
if verbose:
print('Status from fcntl with O_NONBLOCK: ', rv)
if sys.platform not in ['os2emx']:
rv = fcntl.fcntl(f.fileno(), fcntl.F_SETLKW, lockdata)
if verbose:
print('String from fcntl with F_SETLKW: ', repr(rv))
f.close()
os.unlink(filename)
# Again, but pass the file rather than numeric descriptor:
f = open(filename, 'w')
rv = fcntl.fcntl(f, fcntl.F_SETFL, os.O_NONBLOCK)
if sys.platform not in ['os2emx']:
rv = fcntl.fcntl(f, fcntl.F_SETLKW, lockdata)
f.close()
os.unlink(filename)
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