277 lines
8.4 KiB
Python
277 lines
8.4 KiB
Python
from test_support import verify, vereq, 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) )
|
|
f.flush()
|
|
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'
|
|
vereq(m.find('foo'), PAGESIZE)
|
|
|
|
print ' Length of file:', len(m) / float(PAGESIZE), 'pages'
|
|
vereq(len(m), 2*PAGESIZE)
|
|
|
|
print ' Contents of byte 0:', repr(m[0])
|
|
vereq(m[0], '\0')
|
|
print ' Contents of first 3 bytes:', repr(m[0:3])
|
|
vereq(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])
|
|
vereq(m[0], '3')
|
|
print ' Contents of first 3 bytes:', repr(m[0:3])
|
|
vereq(m[0:3], '3\0\0')
|
|
print ' Contents of second page:', repr(m[PAGESIZE-1 : PAGESIZE + 7])
|
|
vereq(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
|
|
|
|
vereq(start, PAGESIZE)
|
|
vereq(end, PAGESIZE + 6)
|
|
|
|
# test seeking around (try to overflow the seek implementation)
|
|
m.seek(0,0)
|
|
print ' Seek to zeroth byte'
|
|
vereq(m.tell(), 0)
|
|
m.seek(42,1)
|
|
print ' Seek to 42nd byte'
|
|
vereq(m.tell(), 42)
|
|
m.seek(0,2)
|
|
print ' Seek to last byte'
|
|
vereq(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
|
|
|
|
# Test for "access" keyword parameter
|
|
try:
|
|
mapsize = 10
|
|
print " Creating", mapsize, "byte test data file."
|
|
open(TESTFN, "wb").write("a"*mapsize)
|
|
print " Opening mmap with access=ACCESS_READ"
|
|
f = open(TESTFN, "rb")
|
|
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
|
|
verify(m[:] == 'a'*mapsize, "Readonly memory map data incorrect.")
|
|
|
|
print " Ensuring that readonly mmap can't be slice assigned."
|
|
try:
|
|
m[:] = 'b'*mapsize
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Able to write to readonly memory map")
|
|
|
|
print " Ensuring that readonly mmap can't be item assigned."
|
|
try:
|
|
m[0] = 'b'
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Able to write to readonly memory map")
|
|
|
|
print " Ensuring that readonly mmap can't be write() to."
|
|
try:
|
|
m.seek(0,0)
|
|
m.write('abc')
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Able to write to readonly memory map")
|
|
|
|
print " Ensuring that readonly mmap can't be write_byte() to."
|
|
try:
|
|
m.seek(0,0)
|
|
m.write_byte('d')
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Able to write to readonly memory map")
|
|
|
|
print " Ensuring that readonly mmap can't be resized."
|
|
try:
|
|
m.resize(2*mapsize)
|
|
except SystemError: # resize is not universally supported
|
|
pass
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Able to resize readonly memory map")
|
|
del m, f
|
|
verify(open(TESTFN, "rb").read() == 'a'*mapsize,
|
|
"Readonly memory map data file was modified")
|
|
|
|
print " Opening mmap with access=ACCESS_WRITE"
|
|
f = open(TESTFN, "r+b")
|
|
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
|
|
print " Modifying write-through memory map."
|
|
m[:] = 'c'*mapsize
|
|
verify(m[:] == 'c'*mapsize,
|
|
"Write-through memory map memory not updated properly.")
|
|
m.flush()
|
|
del m, f
|
|
verify(open(TESTFN).read() == 'c'*mapsize,
|
|
"Write-through memory map data file not updated properly.")
|
|
|
|
print " Opening mmap with access=ACCESS_COPY"
|
|
f = open(TESTFN, "r+b")
|
|
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
|
|
print " Modifying copy-on-write memory map."
|
|
m[:] = 'd'*mapsize
|
|
verify(m[:] == 'd' * mapsize,
|
|
"Copy-on-write memory map data not written correctly.")
|
|
m.flush()
|
|
verify(open(TESTFN, "rb").read() == 'c'*mapsize,
|
|
"Copy-on-write test data file should not be modified.")
|
|
try:
|
|
print " Ensuring copy-on-write maps cannot be resized."
|
|
m.resize(2*mapsize)
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
verify(0, "Copy-on-write mmap resize did not raise exception.")
|
|
del m, f
|
|
try:
|
|
print " Ensuring invalid access parameter raises exception."
|
|
f = open(TESTFN, "r+b")
|
|
m = mmap.mmap(f.fileno(), mapsize, access=4)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, "Invalid access code should have raised exception.")
|
|
|
|
if os.name == "posix":
|
|
# Try incompatible flags, prot and access parameters.
|
|
f = open(TESTFN, "r+b")
|
|
try:
|
|
m = mmap.mmap(f.fileno(), mapsize, flags=mmap.MAP_PRIVATE,
|
|
prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
verify(0, "Incompatible parameters should raise ValueError.")
|
|
f.close()
|
|
finally:
|
|
try:
|
|
os.unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Do a tougher .find() test. SF bug 515943 pointed out that, in 2.2,
|
|
# searching for data with embedded \0 bytes didn't work.
|
|
f = open(TESTFN, 'w+')
|
|
|
|
try: # unlink TESTFN no matter what
|
|
data = 'aabaac\x00deef\x00\x00aa\x00'
|
|
n = len(data)
|
|
f.write(data)
|
|
f.flush()
|
|
m = mmap.mmap(f.fileno(), n)
|
|
f.close()
|
|
|
|
for start in range(n+1):
|
|
for finish in range(start, n+1):
|
|
slice = data[start : finish]
|
|
vereq(m.find(slice), data.find(slice))
|
|
vereq(m.find(slice + 'x'), -1)
|
|
|
|
finally:
|
|
try:
|
|
os.unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
|
|
|
|
print ' Test passed'
|
|
|
|
test_both()
|