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import resource
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resource.setrlimit(resource.RLIMIT_NOFILE, (1, hard_limit))
try:
os.urandom(16)
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except OSError:
pass
else:
# Found the urandom fd (XXX hopefully)
break
os.closerange(3, 256)
with open({TESTFN!r}, 'rb') as f:
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# Issue #26935: posix allows new_fd and fd to be equal but
# some libc implementations have dup2 return an error in this
# case.
if new_fd != fd:
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