[issue11973] kevent does not accept KQ_NOTE_EXIT (and other (f)flags)

[David Naylor]

New submission from David Naylor <naylor.b.david at gmail.com>:

kevent does not accept all legitimate parameters, such as KQ_NOTE_EXIT.  

For example:
>> from select import *
>> kevent(0, KQ_FILTER_PROC, KQ_EV_ADD | KQ_EV_ENABLE, KQ_NOTE_EXIT)
OverflowError: signed integer is greater than maximum

While the following C code compiles (under -Wall -pedantic) without error, or warning:
"""
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>

int main(int argc, char **argv) {

  struct kevent ke;

  EV_SET(&ke, 0, EVFILT_PROC, EV_ADD | EV_ENABLE, NOTE_EXIT, 0, 0);

  return (0);

}
"""

Looking at the Modules/selectmodule.c file it is clear that the fields "flags" and "fflags" are defined as T_USHORT and T_UINT however the flags passed to PyArg_ParseTupleAndKeywords are 'h' and 'i' respectively (implying signed numbers).  

A workaround exists where values X > (2**31 - 1) are passed as (X - 2**32).  Also the attached patch fixes the error.

----------
components: Extension Modules
files: patch-Modules-selectmodule.c
messages: 134918
nosy: DragonSA
priority: normal
severity: normal
status: open
title: kevent does not accept KQ_NOTE_EXIT (and other (f)flags)
type: behavior
versions: Python 2.5, Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4
Added file: http://bugs.python.org/file21847/patch-Modules-selectmodule.c

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<http://bugs.python.org/issue11973>
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