391 lines
13 KiB
Python
391 lines
13 KiB
Python
from test.test_support import TESTFN, run_unittest
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import mmap
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import unittest
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import os, re
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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('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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# 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('[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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open(TESTFN, "wb").write(b"a"*mapsize)
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f = open(TESTFN, "rb")
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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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del m, f
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self.assertEqual(open(TESTFN, "rb").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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import sys
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f = open(TESTFN, "r+b")
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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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f.close()
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if sys.platform.startswith('win'):
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# Repair damage from the resizing test.
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f = open(TESTFN, 'r+b')
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f.truncate(mapsize)
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f.close()
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# Opening mmap with access=ACCESS_WRITE
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f = open(TESTFN, "r+b")
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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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f.close()
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f = open(TESTFN, 'rb')
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stuff = f.read()
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f.close()
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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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f = open(TESTFN, "r+b")
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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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self.assertEqual(open(TESTFN, "rb").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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del m, f
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# Ensuring invalid access parameter raises exception
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f = open(TESTFN, "r+b")
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self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4)
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f.close()
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if os.name == "posix":
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# Try incompatible flags, prot and access parameters.
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f = open(TESTFN, "r+b")
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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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f.close()
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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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f = open(TESTFN, 'wb+')
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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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f.close()
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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_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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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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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_main():
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run_unittest(MmapTests)
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if __name__ == '__main__':
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test_main()
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