1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
#! /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', 'Darwin1.2', 'darwin',
'freebsd2', 'freebsd3', 'freebsd4', 'freebsd5', 'freebsd6',
'freebsd7',
'bsdos2', 'bsdos3', 'bsdos4',
'openbsd', 'openbsd2', 'openbsd3'):
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)
|
