72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
import os
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import resource
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from test.test_support import TESTFN, unlink
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# This test is checking a few specific problem spots. RLIMIT_FSIZE
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# should be RLIM_INFINITY, which will be a really big number on a
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# platform with large file support. On these platforms, we need to
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# test that the get/setrlimit functions properly convert the number to
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# a C long long and that the conversion doesn't raise an error.
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try:
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cur, max = resource.getrlimit(resource.RLIMIT_FSIZE)
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except AttributeError:
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pass
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else:
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print resource.RLIM_INFINITY == max
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resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max))
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# Now check to see what happens when the RLIMIT_FSIZE is small. Some
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# versions of Python were terminated by an uncaught SIGXFSZ, but
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# pythonrun.c has been fixed to ignore that exception. If so, the
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# write() should return EFBIG when the limit is exceeded.
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# At least one platform has an unlimited RLIMIT_FSIZE and attempts to
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# change it raise ValueError instead.
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try:
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try:
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resource.setrlimit(resource.RLIMIT_FSIZE, (1024, max))
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limit_set = 1
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except ValueError:
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limit_set = 0
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f = open(TESTFN, "wb")
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try:
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f.write("X" * 1024)
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try:
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f.write("Y")
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f.flush()
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# On some systems (e.g., Ubuntu on hppa) the flush()
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# doesn't always cause the exception, but the close()
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# does eventually. Try flushing several times in
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# an attempt to ensure the file is really synced and
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# the exception raised.
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for i in range(5):
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time.sleep(.1)
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f.flush()
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except IOError:
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if not limit_set:
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raise
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if limit_set:
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# Close will attempt to flush the byte we wrote
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# Restore limit first to avoid getting a spurious error
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resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max))
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finally:
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f.close()
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finally:
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if limit_set:
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resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max))
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unlink(TESTFN)
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# And be sure that setrlimit is checking for really large values
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too_big = 10L**50
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try:
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resource.setrlimit(resource.RLIMIT_FSIZE, (too_big, max))
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except (OverflowError, ValueError):
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pass
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try:
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resource.setrlimit(resource.RLIMIT_FSIZE, (max, too_big))
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except (OverflowError, ValueError):
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pass
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