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