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cpython/Lib/test/test_mmap.py
Benjamin Peterson ef3e4c2b4d Merged revisions 70980,71059,71225,71234,71241,71243,71249,71251,71255,71266,71299,71329,71397-71398,71486 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

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  r70980 | jack.diederich | 2009-04-01 15:26:13 -0500 (Wed, 01 Apr 2009) | 3 lines

  bounds check arguments to mmap.move().  All of them.  Really.
  fixes crasher on OS X 10.5
........
  r71059 | mark.dickinson | 2009-04-02 13:39:37 -0500 (Thu, 02 Apr 2009) | 2 lines

  sys.long_info attributes should be ints, not longs
........
  r71225 | georg.brandl | 2009-04-05 06:54:07 -0500 (Sun, 05 Apr 2009) | 1 line

  #5580: no need to use parentheses when converterr() argument is actually a type description.
........
  r71234 | georg.brandl | 2009-04-05 08:16:35 -0500 (Sun, 05 Apr 2009) | 1 line

  Whitespace normalization.
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  r71241 | georg.brandl | 2009-04-05 09:48:49 -0500 (Sun, 05 Apr 2009) | 1 line

  #5471: fix expanduser() for $HOME set to "/".
........
  r71243 | georg.brandl | 2009-04-05 10:14:29 -0500 (Sun, 05 Apr 2009) | 1 line

  #5432: make plistlib docstring a raw string, since it contains examples with backslash escapes.
........
  r71249 | georg.brandl | 2009-04-05 11:30:43 -0500 (Sun, 05 Apr 2009) | 1 line

  #5444: adapt make.bat to new htmlhelp output file name.
........
  r71251 | georg.brandl | 2009-04-05 12:17:42 -0500 (Sun, 05 Apr 2009) | 1 line

  #5298: clarify docs about GIL by using more consistent wording.
........
  r71255 | georg.brandl | 2009-04-05 13:34:58 -0500 (Sun, 05 Apr 2009) | 1 line

  #602893: add indicator for current line in cgitb that doesnt rely on styling alone.
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  r71266 | georg.brandl | 2009-04-05 15:23:13 -0500 (Sun, 05 Apr 2009) | 1 line

  Normalize issue referencing style.
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  r71299 | gregory.p.smith | 2009-04-05 18:43:58 -0500 (Sun, 05 Apr 2009) | 3 lines

  Fixes issue5705: os.setuid() and friends did not accept the same range of
  values that pwd.getpwnam() returns.
........
  r71329 | benjamin.peterson | 2009-04-06 16:53:33 -0500 (Mon, 06 Apr 2009) | 1 line

  add create_connection to __all__ #5711
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  r71397 | georg.brandl | 2009-04-08 11:36:39 -0500 (Wed, 08 Apr 2009) | 1 line

  Remove redundant backtick.
........
  r71398 | georg.brandl | 2009-04-08 11:39:04 -0500 (Wed, 08 Apr 2009) | 1 line

  Update ignore file for suspicious builder.
........
  r71486 | andrew.kuchling | 2009-04-11 11:18:14 -0500 (Sat, 11 Apr 2009) | 1 line

  Re-word
........
2009-04-11 19:48:14 +00:00

595 lines
19 KiB
Python
Raw Blame History

from test.support import TESTFN, run_unittest, import_module
import unittest
import os, re, itertools
# Skip test if we can't import mmap.
mmap = import_module('mmap')
PAGESIZE = mmap.PAGESIZE
class MmapTests(unittest.TestCase):
def setUp(self):
if os.path.exists(TESTFN):
os.unlink(TESTFN)
def tearDown(self):
try:
os.unlink(TESTFN)
except OSError:
pass
def test_basic(self):
# Test mmap module on Unix systems and Windows
# Create a file to be mmap'ed.
f = open(TESTFN, 'bw+')
try:
# Write 2 pages worth of data to the file
f.write(b'\0'* PAGESIZE)
f.write(b'foo')
f.write(b'\0'* (PAGESIZE-3) )
f.flush()
m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
finally:
f.close()
# Simple sanity checks
tp = str(type(m)) # SF bug 128713: segfaulted on Linux
self.assertEqual(m.find(b'foo'), PAGESIZE)
self.assertEqual(len(m), 2*PAGESIZE)
self.assertEqual(m[0], 0)
self.assertEqual(m[0:3], b'\0\0\0')
# Shouldn't crash on boundary (Issue #5292)
self.assertRaises(IndexError, m.__getitem__, len(m))
self.assertRaises(IndexError, m.__setitem__, len(m), b'\0')
# Modify the file's content
m[0] = b'3'[0]
m[PAGESIZE +3: PAGESIZE +3+3] = b'bar'
# Check that the modification worked
self.assertEqual(m[0], b'3'[0])
self.assertEqual(m[0:3], b'3\0\0')
self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], b'\0foobar\0')
m.flush()
# Test doing a regular expression match in an mmap'ed file
match = re.search(b'[A-Za-z]+', m)
if match is None:
self.fail('regex match on mmap failed!')
else:
start, end = match.span(0)
length = end - start
self.assertEqual(start, PAGESIZE)
self.assertEqual(end, PAGESIZE + 6)
# test seeking around (try to overflow the seek implementation)
m.seek(0,0)
self.assertEqual(m.tell(), 0)
m.seek(42,1)
self.assertEqual(m.tell(), 42)
m.seek(0,2)
self.assertEqual(m.tell(), len(m))
# Try to seek to negative position...
self.assertRaises(ValueError, m.seek, -1)
# Try to seek beyond end of mmap...
self.assertRaises(ValueError, m.seek, 1, 2)
# Try to seek to negative position...
self.assertRaises(ValueError, m.seek, -len(m)-1, 2)
# Try resizing map
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
self.assertEqual(len(m), 512)
# Check that we can no longer seek beyond the new size.
self.assertRaises(ValueError, m.seek, 513, 0)
# Check that the underlying file is truncated too
# (bug #728515)
f = open(TESTFN)
try:
f.seek(0, 2)
self.assertEqual(f.tell(), 512)
finally:
f.close()
self.assertEqual(m.size(), 512)
m.close()
def test_access_parameter(self):
# Test for "access" keyword parameter
mapsize = 10
open(TESTFN, "wb").write(b"a"*mapsize)
f = open(TESTFN, "rb")
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
self.assertEqual(m[:], b'a'*mapsize, "Readonly memory map data incorrect.")
# Ensuring that readonly mmap can't be slice assigned
try:
m[:] = b'b'*mapsize
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be item assigned
try:
m[0] = b'b'
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be write() to
try:
m.seek(0,0)
m.write(b'abc')
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# Ensuring that readonly mmap can't be write_byte() to
try:
m.seek(0,0)
m.write_byte(b'd')
except TypeError:
pass
else:
self.fail("Able to write to readonly memory map")
# 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:
self.fail("Able to resize readonly memory map")
f.close()
del m, f
self.assertEqual(open(TESTFN, "rb").read(), b'a'*mapsize,
"Readonly memory map data file was modified")
# Opening mmap with size too big
import sys
f = open(TESTFN, "r+b")
try:
m = mmap.mmap(f.fileno(), mapsize+1)
except ValueError:
# we do not expect a ValueError on Windows
# CAUTION: This also changes the size of the file on disk, and
# later tests assume that the length hasn't changed. We need to
# repair that.
if sys.platform.startswith('win'):
self.fail("Opening mmap with size+1 should work on Windows.")
else:
# we expect a ValueError on Unix, but not on Windows
if not sys.platform.startswith('win'):
self.fail("Opening mmap with size+1 should raise ValueError.")
m.close()
f.close()
if sys.platform.startswith('win'):
# Repair damage from the resizing test.
f = open(TESTFN, 'r+b')
f.truncate(mapsize)
f.close()
# Opening mmap with access=ACCESS_WRITE
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
# Modifying write-through memory map
m[:] = b'c'*mapsize
self.assertEqual(m[:], b'c'*mapsize,
"Write-through memory map memory not updated properly.")
m.flush()
m.close()
f.close()
f = open(TESTFN, 'rb')
stuff = f.read()
f.close()
self.assertEqual(stuff, b'c'*mapsize,
"Write-through memory map data file not updated properly.")
# Opening mmap with access=ACCESS_COPY
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
# Modifying copy-on-write memory map
m[:] = b'd'*mapsize
self.assertEqual(m[:], b'd' * mapsize,
"Copy-on-write memory map data not written correctly.")
m.flush()
self.assertEqual(open(TESTFN, "rb").read(), b'c'*mapsize,
"Copy-on-write test data file should not be modified.")
# Ensuring copy-on-write maps cannot be resized
self.assertRaises(TypeError, m.resize, 2*mapsize)
f.close()
del m, f
# Ensuring invalid access parameter raises exception
f = open(TESTFN, "r+b")
self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4)
f.close()
if os.name == "posix":
# Try incompatible flags, prot and access parameters.
f = open(TESTFN, "r+b")
self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize,
flags=mmap.MAP_PRIVATE,
prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
f.close()
def test_bad_file_desc(self):
# Try opening a bad file descriptor...
self.assertRaises(mmap.error, mmap.mmap, -2, 4096)
def test_tougher_find(self):
# 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, 'wb+')
data = b'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]
self.assertEqual(m.find(slice), data.find(slice))
self.assertEqual(m.find(slice + b'x'), -1)
m.close()
def test_find_end(self):
# test the new 'end' parameter works as expected
f = open(TESTFN, 'wb+')
data = b'one two ones'
n = len(data)
f.write(data)
f.flush()
m = mmap.mmap(f.fileno(), n)
f.close()
self.assertEqual(m.find(b'one'), 0)
self.assertEqual(m.find(b'ones'), 8)
self.assertEqual(m.find(b'one', 0, -1), 0)
self.assertEqual(m.find(b'one', 1), 8)
self.assertEqual(m.find(b'one', 1, -1), 8)
self.assertEqual(m.find(b'one', 1, -2), -1)
def test_rfind(self):
# test the new 'end' parameter works as expected
f = open(TESTFN, 'wb+')
data = b'one two ones'
n = len(data)
f.write(data)
f.flush()
m = mmap.mmap(f.fileno(), n)
f.close()
self.assertEqual(m.rfind(b'one'), 8)
self.assertEqual(m.rfind(b'one '), 0)
self.assertEqual(m.rfind(b'one', 0, -1), 8)
self.assertEqual(m.rfind(b'one', 0, -2), 0)
self.assertEqual(m.rfind(b'one', 1, -1), 8)
self.assertEqual(m.rfind(b'one', 1, -2), -1)
def test_double_close(self):
# make sure a double close doesn't crash on Solaris (Bug# 665913)
f = open(TESTFN, 'wb+')
f.write(2**16 * b'a') # Arbitrary character
f.close()
f = open(TESTFN)
mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ)
mf.close()
mf.close()
f.close()
def test_entire_file(self):
# test mapping of entire file by passing 0 for map length
if hasattr(os, "stat"):
f = open(TESTFN, "wb+")
f.write(2**16 * b'm') # Arbitrary character
f.close()
f = open(TESTFN, "rb+")
mf = mmap.mmap(f.fileno(), 0)
self.assertEqual(len(mf), 2**16, "Map size should equal file size.")
self.assertEqual(mf.read(2**16), 2**16 * b"m")
mf.close()
f.close()
def test_move(self):
# make move works everywhere (64-bit format problem earlier)
f = open(TESTFN, 'wb+')
f.write(b"ABCDEabcde") # Arbitrary character
f.flush()
mf = mmap.mmap(f.fileno(), 10)
mf.move(5, 0, 5)
self.assertEqual(mf[:], b"ABCDEABCDE", "Map move should have duplicated front 5")
mf.close()
f.close()
# more excessive test
data = b"0123456789"
for dest in range(len(data)):
for src in range(len(data)):
for count in range(len(data) - max(dest, src)):
expected = data[:dest] + data[src:src+count] + data[dest+count:]
m = mmap.mmap(-1, len(data))
m[:] = data
m.move(dest, src, count)
self.assertEqual(m[:], expected)
m.close()
# segfault test (Issue 5387)
m = mmap.mmap(-1, 100)
offsets = [-100, -1, 0, 1, 100]
for source, dest, size in itertools.product(offsets, offsets, offsets):
try:
m.move(source, dest, size)
except ValueError:
pass
offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
(-1, 0, 0), (0, -1, 0), (0, 0, -1)]
for source, dest, size in offsets:
self.assertRaises(ValueError, m.move, source, dest, size)
m.close()
m = mmap.mmap(-1, 1) # single byte
self.assertRaises(ValueError, m.move, 0, 0, 2)
self.assertRaises(ValueError, m.move, 1, 0, 1)
self.assertRaises(ValueError, m.move, 0, 1, 1)
m.move(0, 0, 1)
m.move(0, 0, 0)
def test_anonymous(self):
# anonymous mmap.mmap(-1, PAGE)
m = mmap.mmap(-1, PAGESIZE)
for x in range(PAGESIZE):
self.assertEqual(m[x], 0,
"anonymously mmap'ed contents should be zero")
for x in range(PAGESIZE):
b = x & 0xff
m[x] = b
self.assertEqual(m[x], b)
def test_extended_getslice(self):
# Test extended slicing by comparing with list slicing.
s = bytes(reversed(range(256)))
m = mmap.mmap(-1, len(s))
m[:] = s
self.assertEqual(m[:], s)
indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
for start in indices:
for stop in indices:
# Skip step 0 (invalid)
for step in indices[1:]:
self.assertEqual(m[start:stop:step],
s[start:stop:step])
def test_extended_set_del_slice(self):
# Test extended slicing by comparing with list slicing.
s = bytes(reversed(range(256)))
m = mmap.mmap(-1, len(s))
indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
for start in indices:
for stop in indices:
# Skip invalid step 0
for step in indices[1:]:
m[:] = s
self.assertEqual(m[:], s)
L = list(s)
# Make sure we have a slice of exactly the right length,
# but with different data.
data = L[start:stop:step]
data = bytes(reversed(data))
L[start:stop:step] = data
m[start:stop:step] = data
self.assertEquals(m[:], bytes(L))
def make_mmap_file (self, f, halfsize):
# Write 2 pages worth of data to the file
f.write (b'\0' * halfsize)
f.write (b'foo')
f.write (b'\0' * (halfsize - 3))
f.flush ()
return mmap.mmap (f.fileno(), 0)
def test_offset (self):
f = open (TESTFN, 'w+b')
try: # unlink TESTFN no matter what
halfsize = mmap.ALLOCATIONGRANULARITY
m = self.make_mmap_file (f, halfsize)
m.close ()
f.close ()
mapsize = halfsize * 2
# Try invalid offset
f = open(TESTFN, "r+b")
for offset in [-2, -1, None]:
try:
m = mmap.mmap(f.fileno(), mapsize, offset=offset)
self.assertEqual(0, 1)
except (ValueError, TypeError, OverflowError):
pass
else:
self.assertEqual(0, 0)
f.close()
# Try valid offset, hopefully 8192 works on all OSes
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), mapsize - halfsize, offset=halfsize)
self.assertEqual(m[0:3], b'foo')
f.close()
# Try resizing map
try:
m.resize(512)
except SystemError:
pass
else:
# resize() is supported
self.assertEqual(len(m), 512)
# Check that we can no longer seek beyond the new size.
self.assertRaises(ValueError, m.seek, 513, 0)
# Check that the content is not changed
self.assertEqual(m[0:3], b'foo')
# Check that the underlying file is truncated too
f = open(TESTFN)
f.seek(0, 2)
self.assertEqual(f.tell(), halfsize + 512)
f.close()
self.assertEqual(m.size(), halfsize + 512)
m.close()
finally:
f.close()
try:
os.unlink(TESTFN)
except OSError:
pass
def test_subclass(self):
class anon_mmap(mmap.mmap):
def __new__(klass, *args, **kwargs):
return mmap.mmap.__new__(klass, -1, *args, **kwargs)
anon_mmap(PAGESIZE)
def test_prot_readonly(self):
if not hasattr(mmap, 'PROT_READ'):
return
mapsize = 10
open(TESTFN, "wb").write(b"a"*mapsize)
f = open(TESTFN, "rb")
m = mmap.mmap(f.fileno(), mapsize, prot=mmap.PROT_READ)
self.assertRaises(TypeError, m.write, "foo")
f.close()
def test_error(self):
self.assert_(issubclass(mmap.error, EnvironmentError))
self.assert_("mmap.error" in str(mmap.error))
def test_io_methods(self):
data = b"0123456789"
open(TESTFN, "wb").write(b"x"*len(data))
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), len(data))
f.close()
# Test write_byte()
for i in range(len(data)):
self.assertEquals(m.tell(), i)
m.write_byte(data[i])
self.assertEquals(m.tell(), i+1)
self.assertRaises(ValueError, m.write_byte, b"x"[0])
self.assertEquals(m[:], data)
# Test read_byte()
m.seek(0)
for i in range(len(data)):
self.assertEquals(m.tell(), i)
self.assertEquals(m.read_byte(), data[i])
self.assertEquals(m.tell(), i+1)
self.assertRaises(ValueError, m.read_byte)
# Test read()
m.seek(3)
self.assertEquals(m.read(3), b"345")
self.assertEquals(m.tell(), 6)
# Test write()
m.seek(3)
m.write(b"bar")
self.assertEquals(m.tell(), 6)
self.assertEquals(m[:], b"012bar6789")
m.seek(8)
self.assertRaises(ValueError, m.write, b"bar")
if os.name == 'nt':
def test_tagname(self):
data1 = b"0123456789"
data2 = b"abcdefghij"
assert len(data1) == len(data2)
# Test same tag
m1 = mmap.mmap(-1, len(data1), tagname="foo")
m1[:] = data1
m2 = mmap.mmap(-1, len(data2), tagname="foo")
m2[:] = data2
self.assertEquals(m1[:], data2)
self.assertEquals(m2[:], data2)
m2.close()
m1.close()
# Test differnt tag
m1 = mmap.mmap(-1, len(data1), tagname="foo")
m1[:] = data1
m2 = mmap.mmap(-1, len(data2), tagname="boo")
m2[:] = data2
self.assertEquals(m1[:], data1)
self.assertEquals(m2[:], data2)
m2.close()
m1.close()
def test_crasher_on_windows(self):
# Should not crash (Issue 1733986)
m = mmap.mmap(-1, 1000, tagname="foo")
try:
mmap.mmap(-1, 5000, tagname="foo")[:] # same tagname, but larger size
except:
pass
m.close()
# Should not crash (Issue 5385)
open(TESTFN, "wb").write(b"x"*10)
f = open(TESTFN, "r+b")
m = mmap.mmap(f.fileno(), 0)
f.close()
try:
m.resize(0) # will raise WindowsError
except:
pass
try:
m[:]
except:
pass
m.close()
def test_main():
run_unittest(MmapTests)
if __name__ == '__main__':
test_main()
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