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134 lines
3.7 KiB
Python
134 lines
3.7 KiB
Python
#!python
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#----------------------------------------------------------------------
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# test largefile support on system where this makes sense
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#
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#XXX how to only run this when support is there
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#XXX how to only optionally run this, it will take along time
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#----------------------------------------------------------------------
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import test_support
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import os, struct, stat, sys
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# only run if the current system support large files
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f = open(test_support.TESTFN, 'w')
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try:
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# 2**31 == 2147483648
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f.seek(2147483649L)
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except (IOError, OverflowError):
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f.close()
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os.unlink(test_support.TESTFN)
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raise test_support.TestSkipped, \
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"platform does not have largefile support"
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else:
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f.close()
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# create >2GB file (2GB = 2147483648 bytes)
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size = 2500000000L
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name = test_support.TESTFN
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# On Windows this test comsumes large resources; It takes a long time to build
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# the >2GB file and takes >2GB of disk space therefore the resource must be
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# enabled to run this test. If not, nothing after this line stanza will be
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# executed.
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if sys.platform[:3] == 'win':
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test_support.requires(
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'largefile',
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'test requires %s bytes and a long time to run' % str(size))
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def expect(got_this, expect_this):
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if test_support.verbose:
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print '%s =?= %s ...' % (`got_this`, `expect_this`),
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if got_this != expect_this:
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if test_support.verbose:
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print 'no'
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raise test_support.TestFailed, 'got %s, but expected %s' %\
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(str(got_this), str(expect_this))
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else:
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if test_support.verbose:
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print 'yes'
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# test that each file function works as expected for a large (i.e. >2GB, do
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# we have to check >4GB) files
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if test_support.verbose:
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print 'create large file via seek (may be sparse file) ...'
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f = open(name, 'w')
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f.seek(size)
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f.write('a')
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f.flush()
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expect(os.fstat(f.fileno())[stat.ST_SIZE], size+1)
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if test_support.verbose:
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print 'check file size with os.fstat'
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f.close()
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if test_support.verbose:
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print 'check file size with os.stat'
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expect(os.stat(name)[stat.ST_SIZE], size+1)
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if test_support.verbose:
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print 'play around with seek() and read() with the built largefile'
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f = open(name, 'r')
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expect(f.tell(), 0)
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expect(f.read(1), '\000')
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expect(f.tell(), 1)
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f.seek(0)
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expect(f.tell(), 0)
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f.seek(0, 0)
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expect(f.tell(), 0)
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f.seek(42)
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expect(f.tell(), 42)
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f.seek(42, 0)
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expect(f.tell(), 42)
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f.seek(42, 1)
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expect(f.tell(), 84)
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f.seek(0, 1)
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expect(f.tell(), 84)
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f.seek(0, 2) # seek from the end
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expect(f.tell(), size + 1 + 0)
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f.seek(-10, 2)
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expect(f.tell(), size + 1 - 10)
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f.seek(-size-1, 2)
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expect(f.tell(), 0)
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f.seek(size)
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expect(f.tell(), size)
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expect(f.read(1), 'a') # the 'a' that was written at the end of the file above
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f.close()
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if test_support.verbose:
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print 'play around with os.lseek() with the built largefile'
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f = open(name, 'r')
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expect(os.lseek(f.fileno(), 0, 0), 0)
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expect(os.lseek(f.fileno(), 42, 0), 42)
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expect(os.lseek(f.fileno(), 42, 1), 84)
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expect(os.lseek(f.fileno(), 0, 1), 84)
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expect(os.lseek(f.fileno(), 0, 2), size+1+0)
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expect(os.lseek(f.fileno(), -10, 2), size+1-10)
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expect(os.lseek(f.fileno(), -size-1, 2), 0)
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expect(os.lseek(f.fileno(), size, 0), size)
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expect(f.read(1), 'a') # the 'a' that was written at the end of the file above
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f.close()
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# XXX add tests for truncate if it exists
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# XXX has truncate ever worked on Windows? specifically on WinNT I get:
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# "IOError: [Errno 13] Permission denied"
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##try:
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## newsize = size - 10
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## f.seek(newsize)
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## f.truncate()
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## expect(f.tell(), newsize)
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## newsize = newsize - 1
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## f.seek(0)
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## f.truncate(newsize)
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## expect(f.tell(), newsize)
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##except AttributeError:
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## pass
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os.unlink(name)
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print >>sys.stderr, name, "exists:", os.path.exists(name)
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