mirror of
https://github.com/python/cpython.git
synced 2025-11-04 03:44:55 +00:00
6278799f8e
Remove unused import of "sys". If the file TESTFN exists before we start, try to remove it. Add spaces around the = in some assignments.
137 lines
3.9 KiB
Python
137 lines
3.9 KiB
Python
from test_support import verify, TESTFN
|
|
import mmap
|
|
import os, re
|
|
|
|
PAGESIZE = mmap.PAGESIZE
|
|
|
|
def test_both():
|
|
"Test mmap module on Unix systems and Windows"
|
|
|
|
# Create a file to be mmap'ed.
|
|
if os.path.exists(TESTFN):
|
|
os.unlink(TESTFN)
|
|
f = open(TESTFN, 'w+')
|
|
|
|
try: # unlink TESTFN no matter what
|
|
# Write 2 pages worth of data to the file
|
|
f.write('\0'* PAGESIZE)
|
|
f.write('foo')
|
|
f.write('\0'* (PAGESIZE-3) )
|
|
|
|
m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
|
|
f.close()
|
|
|
|
# Simple sanity checks
|
|
|
|
print type(m) # SF bug 128713: segfaulted on Linux
|
|
print ' Position of foo:', m.find('foo') / float(PAGESIZE), 'pages'
|
|
verify(m.find('foo') == PAGESIZE)
|
|
|
|
print ' Length of file:', len(m) / float(PAGESIZE), 'pages'
|
|
verify(len(m) == 2*PAGESIZE)
|
|
|
|
print ' Contents of byte 0:', repr(m[0])
|
|
verify(m[0] == '\0')
|
|
print ' Contents of first 3 bytes:', repr(m[0:3])
|
|
verify(m[0:3] == '\0\0\0')
|
|
|
|
# Modify the file's content
|
|
print "\n Modifying file's content..."
|
|
m[0] = '3'
|
|
m[PAGESIZE +3: PAGESIZE +3+3] = 'bar'
|
|
|
|
# Check that the modification worked
|
|
print ' Contents of byte 0:', repr(m[0])
|
|
verify(m[0] == '3')
|
|
print ' Contents of first 3 bytes:', repr(m[0:3])
|
|
verify(m[0:3] == '3\0\0')
|
|
print ' Contents of second page:', repr(m[PAGESIZE-1 : PAGESIZE + 7])
|
|
verify(m[PAGESIZE-1 : PAGESIZE + 7] == '\0foobar\0')
|
|
|
|
m.flush()
|
|
|
|
# Test doing a regular expression match in an mmap'ed file
|
|
match = re.search('[A-Za-z]+', m)
|
|
if match is None:
|
|
print ' ERROR: regex match on mmap failed!'
|
|
else:
|
|
start, end = match.span(0)
|
|
length = end - start
|
|
|
|
print ' Regex match on mmap (page start, length of match):',
|
|
print start / float(PAGESIZE), length
|
|
|
|
verify(start == PAGESIZE)
|
|
verify(end == PAGESIZE + 6)
|
|
|
|
# test seeking around (try to overflow the seek implementation)
|
|
m.seek(0,0)
|
|
print ' Seek to zeroth byte'
|
|
verify(m.tell() == 0)
|
|
m.seek(42,1)
|
|
print ' Seek to 42nd byte'
|
|
verify(m.tell() == 42)
|
|
m.seek(0,2)
|
|
print ' Seek to last byte'
|
|
verify(m.tell() == len(m))
|
|
|
|
print ' Try to seek to negative position...'
|
|
try:
|
|
m.seek(-1)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, 'expected a ValueError but did not get it')
|
|
|
|
print ' Try to seek beyond end of mmap...'
|
|
try:
|
|
m.seek(1,2)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, 'expected a ValueError but did not get it')
|
|
|
|
print ' Try to seek to negative position...'
|
|
try:
|
|
m.seek(-len(m)-1,2)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, 'expected a ValueError but did not get it')
|
|
|
|
# Try resizing map
|
|
print ' Attempting resize()'
|
|
try:
|
|
m.resize( 512 )
|
|
except SystemError:
|
|
# resize() not supported
|
|
# No messages are printed, since the output of this test suite
|
|
# would then be different across platforms.
|
|
pass
|
|
else:
|
|
# resize() is supported
|
|
verify(len(m) == 512,
|
|
"len(m) is %d, but expecting 512" % (len(m),) )
|
|
# Check that we can no longer seek beyond the new size.
|
|
try:
|
|
m.seek(513,0)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, 'Could seek beyond the new size')
|
|
|
|
m.close()
|
|
|
|
finally:
|
|
try:
|
|
f.close()
|
|
except OSError:
|
|
pass
|
|
try:
|
|
os.unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
print ' Test passed'
|
|
|
|
test_both()
|