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https://github.com/python/cpython.git
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0e6bc8c260
on both Unix (SVR4 and BSD) and Windows. Restores behaviour of passing -1 for anonymous memory on Unix. Use MAP_ANONYMOUS instead of _ANON since the latter is deprecated according to Linux (gentoo) man pages. Should we continue to allow mmap.mmap(0, length) to work on Windows? 0 is a valid fd. Will backport bugfix portions.
395 lines
12 KiB
Python
395 lines
12 KiB
Python
from test.test_support import verify, vereq, TESTFN
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import mmap
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import os, re
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PAGESIZE = mmap.PAGESIZE
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def test_both():
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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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if os.path.exists(TESTFN):
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os.unlink(TESTFN)
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f = open(TESTFN, 'w+')
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try: # unlink TESTFN no matter what
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# Write 2 pages worth of data to the file
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f.write('\0'* PAGESIZE)
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f.write('foo')
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f.write('\0'* (PAGESIZE-3) )
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f.flush()
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m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
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f.close()
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# Simple sanity checks
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print type(m) # SF bug 128713: segfaulted on Linux
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print ' Position of foo:', m.find('foo') / float(PAGESIZE), 'pages'
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vereq(m.find('foo'), PAGESIZE)
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print ' Length of file:', len(m) / float(PAGESIZE), 'pages'
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vereq(len(m), 2*PAGESIZE)
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print ' Contents of byte 0:', repr(m[0])
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vereq(m[0], '\0')
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print ' Contents of first 3 bytes:', repr(m[0:3])
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vereq(m[0:3], '\0\0\0')
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# Modify the file's content
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print "\n Modifying file's content..."
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m[0] = '3'
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m[PAGESIZE +3: PAGESIZE +3+3] = 'bar'
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# Check that the modification worked
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print ' Contents of byte 0:', repr(m[0])
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vereq(m[0], '3')
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print ' Contents of first 3 bytes:', repr(m[0:3])
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vereq(m[0:3], '3\0\0')
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print ' Contents of second page:', repr(m[PAGESIZE-1 : PAGESIZE + 7])
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vereq(m[PAGESIZE-1 : PAGESIZE + 7], '\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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print ' ERROR: 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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print ' Regex match on mmap (page start, length of match):',
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print start / float(PAGESIZE), length
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vereq(start, PAGESIZE)
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vereq(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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print ' Seek to zeroth byte'
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vereq(m.tell(), 0)
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m.seek(42,1)
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print ' Seek to 42nd byte'
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vereq(m.tell(), 42)
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m.seek(0,2)
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print ' Seek to last byte'
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vereq(m.tell(), len(m))
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print ' Try to seek to negative position...'
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try:
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m.seek(-1)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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print ' Try to seek beyond end of mmap...'
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try:
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m.seek(1,2)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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print ' Try to seek to negative position...'
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try:
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m.seek(-len(m)-1,2)
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except ValueError:
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pass
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else:
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verify(0, 'expected a ValueError but did not get it')
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# Try resizing map
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print ' Attempting resize()'
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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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verify(len(m) == 512,
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"len(m) is %d, but expecting 512" % (len(m),) )
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# Check that we can no longer seek beyond the new size.
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try:
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m.seek(513,0)
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except ValueError:
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pass
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else:
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verify(0, 'Could seek beyond the new size')
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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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f.seek(0, 2)
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verify(f.tell() == 512, 'Underlying file not truncated')
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f.close()
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verify(m.size() == 512, 'New size not reflected in file')
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m.close()
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finally:
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try:
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f.close()
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except OSError:
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pass
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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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# Test for "access" keyword parameter
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try:
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mapsize = 10
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print " Creating", mapsize, "byte test data file."
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open(TESTFN, "wb").write("a"*mapsize)
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print " Opening mmap with access=ACCESS_READ"
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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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verify(m[:] == 'a'*mapsize, "Readonly memory map data incorrect.")
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print " Ensuring that readonly mmap can't be slice assigned."
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try:
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m[:] = 'b'*mapsize
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except TypeError:
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pass
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else:
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verify(0, "Able to write to readonly memory map")
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print " Ensuring that readonly mmap can't be item assigned."
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try:
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m[0] = 'b'
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except TypeError:
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pass
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else:
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verify(0, "Able to write to readonly memory map")
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print " 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('abc')
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except TypeError:
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pass
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else:
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verify(0, "Able to write to readonly memory map")
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print " 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('d')
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except TypeError:
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pass
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else:
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verify(0, "Able to write to readonly memory map")
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print " 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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verify(0, "Able to resize readonly memory map")
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del m, f
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verify(open(TESTFN, "rb").read() == 'a'*mapsize,
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"Readonly memory map data file was modified")
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print " 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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verify(0, "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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verify(0, "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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print " 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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print " Modifying write-through memory map."
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m[:] = 'c'*mapsize
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verify(m[:] == '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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verify(stuff == 'c'*mapsize,
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"Write-through memory map data file not updated properly.")
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print " 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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print " Modifying copy-on-write memory map."
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m[:] = 'd'*mapsize
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verify(m[:] == '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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verify(open(TESTFN, "rb").read() == 'c'*mapsize,
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"Copy-on-write test data file should not be modified.")
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try:
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print " Ensuring copy-on-write maps cannot be resized."
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m.resize(2*mapsize)
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except TypeError:
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pass
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else:
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verify(0, "Copy-on-write mmap resize did not raise exception.")
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del m, f
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try:
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print " Ensuring invalid access parameter raises exception."
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f = open(TESTFN, "r+b")
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m = mmap.mmap(f.fileno(), mapsize, access=4)
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except ValueError:
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pass
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else:
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verify(0, "Invalid access code should have raised exception.")
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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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try:
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m = mmap.mmap(f.fileno(), mapsize, flags=mmap.MAP_PRIVATE,
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prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
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except ValueError:
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pass
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else:
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verify(0, "Incompatible parameters should raise ValueError.")
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f.close()
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finally:
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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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print ' Try opening a bad file descriptor...'
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try:
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mmap.mmap(-2, 4096)
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except mmap.error:
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pass
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else:
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verify(0, 'expected a mmap.error but did not get it')
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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, 'w+')
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try: # unlink TESTFN no matter what
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data = '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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vereq(m.find(slice), data.find(slice))
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vereq(m.find(slice + 'x'), -1)
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m.close()
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finally:
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os.unlink(TESTFN)
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# make sure a double close doesn't crash on Solaris (Bug# 665913)
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f = open(TESTFN, 'w+')
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try: # unlink TESTFN no matter what
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f.write(2**16 * '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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finally:
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os.unlink(TESTFN)
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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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print " Ensuring that passing 0 as map length sets map size to current file size."
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f = open(TESTFN, "w+")
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try:
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f.write(2**16 * '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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verify(len(mf) == 2**16, "Map size should equal file size.")
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vereq(mf.read(2**16), 2**16 * "m")
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mf.close()
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f.close()
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finally:
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os.unlink(TESTFN)
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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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print " Ensuring that passing 0 as map length sets map size to current file size."
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f = open(TESTFN, "w+")
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try:
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f.write(2**16 * '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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verify(len(mf) == 2**16, "Map size should equal file size.")
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vereq(mf.read(2**16), 2**16 * "m")
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mf.close()
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f.close()
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finally:
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os.unlink(TESTFN)
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# make move works everywhere (64-bit format problem earlier)
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f = open(TESTFN, 'w+')
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try: # unlink TESTFN no matter what
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f.write("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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verify(mf[:] == "ABCDEABCDE", "Map move should have duplicated front 5")
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mf.close()
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f.close()
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finally:
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os.unlink(TESTFN)
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def test_anon():
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print " anonymous mmap.mmap(-1, PAGESIZE)..."
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m = mmap.mmap(-1, PAGESIZE)
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for x in xrange(PAGESIZE):
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verify(m[x] == '\0', "anonymously mmap'ed contents should be zero")
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for x in xrange(PAGESIZE):
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m[x] = ch = chr(x & 255)
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vereq(m[x], ch)
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test_both()
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test_anon()
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print ' Test passed'
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