Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / devtools / v9 / lib / python2.4 / test / test_mmap.py

from test.test_support import verify, vereq, TESTFN
import mmap
import os, re

PAGESIZE = mmap.PAGESIZE

def test_both():
   "Test mmap module on Unix systems and Windows"

   # Create a file to be mmap'ed.
   if os.path.exists(TESTFN):
       os.unlink(TESTFN)
   f = open(TESTFN, 'w+')

   try:    # unlink TESTFN no matter what
       # Write 2 pages worth of data to the file
       f.write('\0'* PAGESIZE)
       f.write('foo')
       f.write('\0'* (PAGESIZE-3) )
       f.flush()
       m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
       f.close()

       # Simple sanity checks

       print type(m)  # SF bug 128713:  segfaulted on Linux
       print '  Position of foo:', m.find('foo') / float(PAGESIZE), 'pages'
       vereq(m.find('foo'), PAGESIZE)

       print '  Length of file:', len(m) / float(PAGESIZE), 'pages'
       vereq(len(m), 2*PAGESIZE)

       print '  Contents of byte 0:', repr(m[0])
       vereq(m[0], '\0')
       print '  Contents of first 3 bytes:', repr(m[0:3])
       vereq(m[0:3], '\0\0\0')

       # Modify the file's content
       print "\n  Modifying file's content..."
       m[0] = '3'
       m[PAGESIZE +3: PAGESIZE +3+3] = 'bar'

       # Check that the modification worked
       print '  Contents of byte 0:', repr(m[0])
       vereq(m[0], '3')
       print '  Contents of first 3 bytes:', repr(m[0:3])
       vereq(m[0:3], '3\0\0')
       print '  Contents of second page:',  repr(m[PAGESIZE-1 : PAGESIZE + 7])
       vereq(m[PAGESIZE-1 : PAGESIZE + 7], '\0foobar\0')

       m.flush()

       # Test doing a regular expression match in an mmap'ed file
       match = re.search('[A-Za-z]+', m)
       if match is None:
           print '  ERROR: regex match on mmap failed!'
       else:
           start, end = match.span(0)
           length = end - start

           print '  Regex match on mmap (page start, length of match):',
           print start / float(PAGESIZE), length

           vereq(start, PAGESIZE)
           vereq(end, PAGESIZE + 6)

       # test seeking around (try to overflow the seek implementation)
       m.seek(0,0)
       print '  Seek to zeroth byte'
       vereq(m.tell(), 0)
       m.seek(42,1)
       print '  Seek to 42nd byte'
       vereq(m.tell(), 42)
       m.seek(0,2)
       print '  Seek to last byte'
       vereq(m.tell(), len(m))

       print '  Try to seek to negative position...'
       try:
           m.seek(-1)
       except ValueError:
           pass
       else:
           verify(0, 'expected a ValueError but did not get it')

       print '  Try to seek beyond end of mmap...'
       try:
           m.seek(1,2)
       except ValueError:
           pass
       else:
           verify(0, 'expected a ValueError but did not get it')

       print '  Try to seek to negative position...'
       try:
           m.seek(-len(m)-1,2)
       except ValueError:
           pass
       else:
           verify(0, 'expected a ValueError but did not get it')

       # Try resizing map
       print '  Attempting resize()'
       try:
           m.resize(512)
       except SystemError:
           # resize() not supported
           # No messages are printed, since the output of this test suite
           # would then be different across platforms.
           pass
       else:
           # resize() is supported
           verify(len(m) == 512,
                   "len(m) is %d, but expecting 512" % (len(m),) )
           # Check that we can no longer seek beyond the new size.
           try:
               m.seek(513,0)
           except ValueError:
               pass
           else:
               verify(0, 'Could seek beyond the new size')

           # Check that the underlying file is truncated too
           # (bug #728515)
           f = open(TESTFN)
           f.seek(0, 2)
           verify(f.tell() == 512, 'Underlying file not truncated')
           f.close()
           verify(m.size() == 512, 'New size not reflected in file') 

       m.close()

   finally:
       try:
           f.close()
       except OSError:
           pass
       try:
           os.unlink(TESTFN)
       except OSError:
           pass

   # Test for "access" keyword parameter
   try:
       mapsize = 10
       print "  Creating", mapsize, "byte test data file."
       open(TESTFN, "wb").write("a"*mapsize)
       print "  Opening mmap with access=ACCESS_READ"
       f = open(TESTFN, "rb")
       m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
       verify(m[:] == 'a'*mapsize, "Readonly memory map data incorrect.")

       print "  Ensuring that readonly mmap can't be slice assigned."
       try:
           m[:] = 'b'*mapsize
       except TypeError:
           pass
       else:
           verify(0, "Able to write to readonly memory map")

       print "  Ensuring that readonly mmap can't be item assigned."
       try:
           m[0] = 'b'
       except TypeError:
           pass
       else:
           verify(0, "Able to write to readonly memory map")

       print "  Ensuring that readonly mmap can't be write() to."
       try:
           m.seek(0,0)
           m.write('abc')
       except TypeError:
           pass
       else:
           verify(0, "Able to write to readonly memory map")

       print "  Ensuring that readonly mmap can't be write_byte() to."
       try:
           m.seek(0,0)
           m.write_byte('d')
       except TypeError:
           pass
       else:
           verify(0, "Able to write to readonly memory map")

       print "  Ensuring that readonly mmap can't be resized."
       try:
           m.resize(2*mapsize)
       except SystemError:   # resize is not universally supported
           pass
       except TypeError:
           pass
       else:
           verify(0, "Able to resize readonly memory map")
       del m, f
       verify(open(TESTFN, "rb").read() == 'a'*mapsize,
              "Readonly memory map data file was modified")

       print "  Opening mmap with size too big"
       import sys
       f = open(TESTFN, "r+b")
       try:
           m = mmap.mmap(f.fileno(), mapsize+1)
       except ValueError:
           # we do not expect a ValueError on Windows
           # CAUTION:  This also changes the size of the file on disk, and
           # later tests assume that the length hasn't changed.  We need to
           # repair that.
           if sys.platform.startswith('win'):
               verify(0, "Opening mmap with size+1 should work on Windows.")
       else:
           # we expect a ValueError on Unix, but not on Windows
           if not sys.platform.startswith('win'):
               verify(0, "Opening mmap with size+1 should raise ValueError.")
           m.close()
       f.close()
       if sys.platform.startswith('win'):
           # Repair damage from the resizing test.
           f = open(TESTFN, 'r+b')
           f.truncate(mapsize)
           f.close()

       print "  Opening mmap with access=ACCESS_WRITE"
       f = open(TESTFN, "r+b")
       m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
       print "  Modifying write-through memory map."
       m[:] = 'c'*mapsize
       verify(m[:] == 'c'*mapsize,
              "Write-through memory map memory not updated properly.")
       m.flush()
       m.close()
       f.close()
       f = open(TESTFN, 'rb')
       stuff = f.read()
       f.close()
       verify(stuff == 'c'*mapsize,
              "Write-through memory map data file not updated properly.")

       print "  Opening mmap with access=ACCESS_COPY"
       f = open(TESTFN, "r+b")
       m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
       print "  Modifying copy-on-write memory map."
       m[:] = 'd'*mapsize
       verify(m[:] == 'd' * mapsize,
              "Copy-on-write memory map data not written correctly.")
       m.flush()
       verify(open(TESTFN, "rb").read() == 'c'*mapsize,
              "Copy-on-write test data file should not be modified.")
       try:
           print "  Ensuring copy-on-write maps cannot be resized."
           m.resize(2*mapsize)
       except TypeError:
           pass
       else:
           verify(0, "Copy-on-write mmap resize did not raise exception.")
       del m, f
       try:
           print "  Ensuring invalid access parameter raises exception."
           f = open(TESTFN, "r+b")
           m = mmap.mmap(f.fileno(), mapsize, access=4)
       except ValueError:
           pass
       else:
           verify(0, "Invalid access code should have raised exception.")

       if os.name == "posix":
           # Try incompatible flags, prot and access parameters.
           f = open(TESTFN, "r+b")
           try:
               m = mmap.mmap(f.fileno(), mapsize, flags=mmap.MAP_PRIVATE,
                             prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
           except ValueError:
               pass
           else:
               verify(0, "Incompatible parameters should raise ValueError.")
           f.close()
   finally:
       try:
           os.unlink(TESTFN)
       except OSError:
           pass

   # Do a tougher .find() test.  SF bug 515943 pointed out that, in 2.2,
   # searching for data with embedded \0 bytes didn't work.
   f = open(TESTFN, 'w+')

   try:    # unlink TESTFN no matter what
       data = 'aabaac\x00deef\x00\x00aa\x00'
       n = len(data)
       f.write(data)
       f.flush()
       m = mmap.mmap(f.fileno(), n)
       f.close()

       for start in range(n+1):
           for finish in range(start, n+1):
               slice = data[start : finish]
               vereq(m.find(slice), data.find(slice))
               vereq(m.find(slice + 'x'), -1)
       m.close()

   finally:
       os.unlink(TESTFN)

   # make sure a double close doesn't crash on Solaris (Bug# 665913)
   f = open(TESTFN, 'w+')

   try:    # unlink TESTFN no matter what
       f.write(2**16 * 'a') # Arbitrary character
       f.close()

       f = open(TESTFN)
       mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ)
       mf.close()
       mf.close()
       f.close()

   finally:
       os.unlink(TESTFN)


   print ' Test passed'

test_both()