628 lines
21 KiB
Python
628 lines
21 KiB
Python
from test.support import TESTFN, run_unittest, import_module
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import unittest
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import os
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import re
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import itertools
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import socket
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import sys
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# Skip test if we can't import mmap.
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mmap = import_module('mmap')
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PAGESIZE = mmap.PAGESIZE
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class MmapTests(unittest.TestCase):
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def setUp(self):
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if os.path.exists(TESTFN):
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os.unlink(TESTFN)
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def tearDown(self):
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try:
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os.unlink(TESTFN)
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except OSError:
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pass
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def test_basic(self):
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# Test mmap module on Unix systems and Windows
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# Create a file to be mmap'ed.
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f = open(TESTFN, 'bw+')
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try:
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# Write 2 pages worth of data to the file
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f.write(b'\0'* PAGESIZE)
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f.write(b'foo')
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f.write(b'\0'* (PAGESIZE-3) )
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f.flush()
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m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
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finally:
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f.close()
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# Simple sanity checks
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tp = str(type(m)) # SF bug 128713: segfaulted on Linux
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self.assertEqual(m.find(b'foo'), PAGESIZE)
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self.assertEqual(len(m), 2*PAGESIZE)
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self.assertEqual(m[0], 0)
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self.assertEqual(m[0:3], b'\0\0\0')
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# Shouldn't crash on boundary (Issue #5292)
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self.assertRaises(IndexError, m.__getitem__, len(m))
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self.assertRaises(IndexError, m.__setitem__, len(m), b'\0')
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# Modify the file's content
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m[0] = b'3'[0]
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m[PAGESIZE +3: PAGESIZE +3+3] = b'bar'
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# Check that the modification worked
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self.assertEqual(m[0], b'3'[0])
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self.assertEqual(m[0:3], b'3\0\0')
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self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], b'\0foobar\0')
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m.flush()
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# Test doing a regular expression match in an mmap'ed file
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match = re.search(b'[A-Za-z]+', m)
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if match is None:
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self.fail('regex match on mmap failed!')
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else:
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start, end = match.span(0)
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length = end - start
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self.assertEqual(start, PAGESIZE)
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self.assertEqual(end, PAGESIZE + 6)
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# test seeking around (try to overflow the seek implementation)
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m.seek(0,0)
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self.assertEqual(m.tell(), 0)
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m.seek(42,1)
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self.assertEqual(m.tell(), 42)
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m.seek(0,2)
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self.assertEqual(m.tell(), len(m))
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# Try to seek to negative position...
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self.assertRaises(ValueError, m.seek, -1)
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# Try to seek beyond end of mmap...
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self.assertRaises(ValueError, m.seek, 1, 2)
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# Try to seek to negative position...
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self.assertRaises(ValueError, m.seek, -len(m)-1, 2)
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# Try resizing map
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try:
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m.resize(512)
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except SystemError:
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# resize() not supported
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# No messages are printed, since the output of this test suite
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# would then be different across platforms.
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pass
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else:
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# resize() is supported
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self.assertEqual(len(m), 512)
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# Check that we can no longer seek beyond the new size.
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self.assertRaises(ValueError, m.seek, 513, 0)
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# Check that the underlying file is truncated too
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# (bug #728515)
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f = open(TESTFN)
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try:
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f.seek(0, 2)
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self.assertEqual(f.tell(), 512)
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finally:
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f.close()
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self.assertEqual(m.size(), 512)
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m.close()
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def test_access_parameter(self):
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# Test for "access" keyword parameter
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mapsize = 10
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with open(TESTFN, "wb") as fp:
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fp.write(b"a"*mapsize)
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with open(TESTFN, "rb") as f:
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
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self.assertEqual(m[:], b'a'*mapsize, "Readonly memory map data incorrect.")
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# Ensuring that readonly mmap can't be slice assigned
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try:
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m[:] = b'b'*mapsize
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be item assigned
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try:
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m[0] = b'b'
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be write() to
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try:
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m.seek(0,0)
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m.write(b'abc')
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be write_byte() to
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try:
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m.seek(0,0)
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m.write_byte(b'd')
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be resized
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try:
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m.resize(2*mapsize)
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except SystemError: # resize is not universally supported
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pass
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except TypeError:
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pass
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else:
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self.fail("Able to resize readonly memory map")
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with open(TESTFN, "rb") as fp:
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self.assertEqual(fp.read(), b'a'*mapsize,
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"Readonly memory map data file was modified")
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# Opening mmap with size too big
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with open(TESTFN, "r+b") as f:
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try:
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m = mmap.mmap(f.fileno(), mapsize+1)
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except ValueError:
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# we do not expect a ValueError on Windows
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# CAUTION: This also changes the size of the file on disk, and
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# later tests assume that the length hasn't changed. We need to
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# repair that.
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if sys.platform.startswith('win'):
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self.fail("Opening mmap with size+1 should work on Windows.")
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else:
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# we expect a ValueError on Unix, but not on Windows
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if not sys.platform.startswith('win'):
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self.fail("Opening mmap with size+1 should raise ValueError.")
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m.close()
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if sys.platform.startswith('win'):
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# Repair damage from the resizing test.
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with open(TESTFN, 'r+b') as f:
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f.truncate(mapsize)
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# Opening mmap with access=ACCESS_WRITE
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with open(TESTFN, "r+b") as f:
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
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# Modifying write-through memory map
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m[:] = b'c'*mapsize
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self.assertEqual(m[:], b'c'*mapsize,
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"Write-through memory map memory not updated properly.")
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m.flush()
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m.close()
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with open(TESTFN, 'rb') as f:
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stuff = f.read()
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self.assertEqual(stuff, b'c'*mapsize,
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"Write-through memory map data file not updated properly.")
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# Opening mmap with access=ACCESS_COPY
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with open(TESTFN, "r+b") as f:
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
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# Modifying copy-on-write memory map
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m[:] = b'd'*mapsize
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self.assertEqual(m[:], b'd' * mapsize,
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"Copy-on-write memory map data not written correctly.")
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m.flush()
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with open(TESTFN, "rb") as fp:
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self.assertEqual(fp.read(), b'c'*mapsize,
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"Copy-on-write test data file should not be modified.")
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# Ensuring copy-on-write maps cannot be resized
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self.assertRaises(TypeError, m.resize, 2*mapsize)
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m.close()
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# Ensuring invalid access parameter raises exception
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with open(TESTFN, "r+b") as f:
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self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4)
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if os.name == "posix":
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# Try incompatible flags, prot and access parameters.
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with open(TESTFN, "r+b") as f:
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self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize,
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flags=mmap.MAP_PRIVATE,
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prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
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def test_bad_file_desc(self):
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# Try opening a bad file descriptor...
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self.assertRaises(mmap.error, mmap.mmap, -2, 4096)
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def test_tougher_find(self):
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# Do a tougher .find() test. SF bug 515943 pointed out that, in 2.2,
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# searching for data with embedded \0 bytes didn't work.
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with open(TESTFN, 'wb+') as f:
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data = b'aabaac\x00deef\x00\x00aa\x00'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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for start in range(n+1):
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for finish in range(start, n+1):
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slice = data[start : finish]
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self.assertEqual(m.find(slice), data.find(slice))
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self.assertEqual(m.find(slice + b'x'), -1)
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m.close()
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def test_find_end(self):
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# test the new 'end' parameter works as expected
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f = open(TESTFN, 'wb+')
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data = b'one two ones'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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f.close()
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self.assertEqual(m.find(b'one'), 0)
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self.assertEqual(m.find(b'ones'), 8)
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self.assertEqual(m.find(b'one', 0, -1), 0)
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self.assertEqual(m.find(b'one', 1), 8)
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self.assertEqual(m.find(b'one', 1, -1), 8)
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self.assertEqual(m.find(b'one', 1, -2), -1)
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def test_rfind(self):
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# test the new 'end' parameter works as expected
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f = open(TESTFN, 'wb+')
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data = b'one two ones'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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f.close()
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self.assertEqual(m.rfind(b'one'), 8)
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self.assertEqual(m.rfind(b'one '), 0)
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self.assertEqual(m.rfind(b'one', 0, -1), 8)
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self.assertEqual(m.rfind(b'one', 0, -2), 0)
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self.assertEqual(m.rfind(b'one', 1, -1), 8)
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self.assertEqual(m.rfind(b'one', 1, -2), -1)
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def test_double_close(self):
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# make sure a double close doesn't crash on Solaris (Bug# 665913)
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f = open(TESTFN, 'wb+')
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f.write(2**16 * b'a') # Arbitrary character
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f.close()
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f = open(TESTFN)
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mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ)
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mf.close()
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mf.close()
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f.close()
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def test_entire_file(self):
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# test mapping of entire file by passing 0 for map length
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if hasattr(os, "stat"):
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f = open(TESTFN, "wb+")
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f.write(2**16 * b'm') # Arbitrary character
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f.close()
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f = open(TESTFN, "rb+")
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mf = mmap.mmap(f.fileno(), 0)
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self.assertEqual(len(mf), 2**16, "Map size should equal file size.")
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self.assertEqual(mf.read(2**16), 2**16 * b"m")
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mf.close()
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f.close()
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def test_move(self):
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# make move works everywhere (64-bit format problem earlier)
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f = open(TESTFN, 'wb+')
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f.write(b"ABCDEabcde") # Arbitrary character
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f.flush()
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mf = mmap.mmap(f.fileno(), 10)
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mf.move(5, 0, 5)
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self.assertEqual(mf[:], b"ABCDEABCDE", "Map move should have duplicated front 5")
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mf.close()
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f.close()
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# more excessive test
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data = b"0123456789"
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for dest in range(len(data)):
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for src in range(len(data)):
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for count in range(len(data) - max(dest, src)):
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expected = data[:dest] + data[src:src+count] + data[dest+count:]
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m = mmap.mmap(-1, len(data))
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m[:] = data
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m.move(dest, src, count)
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self.assertEqual(m[:], expected)
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m.close()
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# segfault test (Issue 5387)
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m = mmap.mmap(-1, 100)
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offsets = [-100, -1, 0, 1, 100]
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for source, dest, size in itertools.product(offsets, offsets, offsets):
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try:
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m.move(source, dest, size)
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except ValueError:
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pass
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offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
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(-1, 0, 0), (0, -1, 0), (0, 0, -1)]
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for source, dest, size in offsets:
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self.assertRaises(ValueError, m.move, source, dest, size)
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m.close()
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m = mmap.mmap(-1, 1) # single byte
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self.assertRaises(ValueError, m.move, 0, 0, 2)
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self.assertRaises(ValueError, m.move, 1, 0, 1)
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self.assertRaises(ValueError, m.move, 0, 1, 1)
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m.move(0, 0, 1)
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m.move(0, 0, 0)
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def test_anonymous(self):
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# anonymous mmap.mmap(-1, PAGE)
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m = mmap.mmap(-1, PAGESIZE)
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for x in range(PAGESIZE):
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self.assertEqual(m[x], 0,
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"anonymously mmap'ed contents should be zero")
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for x in range(PAGESIZE):
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b = x & 0xff
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m[x] = b
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self.assertEqual(m[x], b)
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def test_extended_getslice(self):
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# Test extended slicing by comparing with list slicing.
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s = bytes(reversed(range(256)))
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m = mmap.mmap(-1, len(s))
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m[:] = s
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self.assertEqual(m[:], s)
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indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
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for start in indices:
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for stop in indices:
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# Skip step 0 (invalid)
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for step in indices[1:]:
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self.assertEqual(m[start:stop:step],
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s[start:stop:step])
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def test_extended_set_del_slice(self):
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# Test extended slicing by comparing with list slicing.
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s = bytes(reversed(range(256)))
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m = mmap.mmap(-1, len(s))
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indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
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for start in indices:
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for stop in indices:
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# Skip invalid step 0
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for step in indices[1:]:
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m[:] = s
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self.assertEqual(m[:], s)
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L = list(s)
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# Make sure we have a slice of exactly the right length,
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# but with different data.
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data = L[start:stop:step]
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data = bytes(reversed(data))
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L[start:stop:step] = data
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m[start:stop:step] = data
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self.assertEquals(m[:], bytes(L))
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def make_mmap_file (self, f, halfsize):
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# Write 2 pages worth of data to the file
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f.write (b'\0' * halfsize)
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f.write (b'foo')
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f.write (b'\0' * (halfsize - 3))
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f.flush ()
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return mmap.mmap (f.fileno(), 0)
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def test_offset (self):
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f = open (TESTFN, 'w+b')
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try: # unlink TESTFN no matter what
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halfsize = mmap.ALLOCATIONGRANULARITY
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m = self.make_mmap_file (f, halfsize)
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m.close ()
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f.close ()
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mapsize = halfsize * 2
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# Try invalid offset
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f = open(TESTFN, "r+b")
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for offset in [-2, -1, None]:
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try:
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m = mmap.mmap(f.fileno(), mapsize, offset=offset)
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self.assertEqual(0, 1)
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except (ValueError, TypeError, OverflowError):
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pass
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else:
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self.assertEqual(0, 0)
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f.close()
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# Try valid offset, hopefully 8192 works on all OSes
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f = open(TESTFN, "r+b")
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m = mmap.mmap(f.fileno(), mapsize - halfsize, offset=halfsize)
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self.assertEqual(m[0:3], b'foo')
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f.close()
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# Try resizing map
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try:
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m.resize(512)
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except SystemError:
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pass
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else:
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# resize() is supported
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self.assertEqual(len(m), 512)
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# Check that we can no longer seek beyond the new size.
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self.assertRaises(ValueError, m.seek, 513, 0)
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# Check that the content is not changed
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self.assertEqual(m[0:3], b'foo')
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# Check that the underlying file is truncated too
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f = open(TESTFN)
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f.seek(0, 2)
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self.assertEqual(f.tell(), halfsize + 512)
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f.close()
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self.assertEqual(m.size(), halfsize + 512)
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m.close()
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finally:
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f.close()
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try:
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os.unlink(TESTFN)
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except OSError:
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pass
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def test_subclass(self):
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class anon_mmap(mmap.mmap):
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def __new__(klass, *args, **kwargs):
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return mmap.mmap.__new__(klass, -1, *args, **kwargs)
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anon_mmap(PAGESIZE)
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def test_prot_readonly(self):
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if not hasattr(mmap, 'PROT_READ'):
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return
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mapsize = 10
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with open(TESTFN, "wb") as fp:
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fp.write(b"a"*mapsize)
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f = open(TESTFN, "rb")
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m = mmap.mmap(f.fileno(), mapsize, prot=mmap.PROT_READ)
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self.assertRaises(TypeError, m.write, "foo")
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f.close()
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def test_error(self):
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self.assertTrue(issubclass(mmap.error, EnvironmentError))
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self.assertIn("mmap.error", str(mmap.error))
|
|
|
|
def test_io_methods(self):
|
|
data = b"0123456789"
|
|
with open(TESTFN, "wb") as fp:
|
|
fp.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")
|
|
|
|
def test_non_ascii_byte(self):
|
|
for b in (129, 200, 255): # > 128
|
|
m = mmap.mmap(-1, 1)
|
|
m.write_byte(b)
|
|
self.assertEquals(m[0], b)
|
|
m.seek(0)
|
|
self.assertEquals(m.read_byte(), b)
|
|
m.close()
|
|
|
|
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)
|
|
with open(TESTFN, "wb") as fp:
|
|
fp.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_invalid_descriptor(self):
|
|
# socket file descriptors are valid, but out of range
|
|
# for _get_osfhandle, causing a crash when validating the
|
|
# parameters to _get_osfhandle.
|
|
s = socket.socket()
|
|
try:
|
|
with self.assertRaises(mmap.error):
|
|
m = mmap.mmap(s.fileno(), 10)
|
|
finally:
|
|
s.close()
|
|
|
|
def test_context_manager(self):
|
|
with mmap.mmap(-1, 10) as m:
|
|
self.assertFalse(m.closed)
|
|
self.assertTrue(m.closed)
|
|
|
|
def test_context_manager_exception(self):
|
|
# Test that the IOError gets passed through
|
|
with self.assertRaises(Exception) as exc:
|
|
with mmap.mmap(-1, 10) as m:
|
|
raise IOError
|
|
self.assertIsInstance(exc.exception, IOError,
|
|
"wrong exception raised in context manager")
|
|
self.assertTrue(m.closed, "context manager failed")
|
|
|
|
|
|
def test_main():
|
|
run_unittest(MmapTests)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|