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bug#9076: coreutils-8.12 uses SA_RESETHAND and SA_RESTART unconditionall
bug#9076: coreutils-8.12 uses SA_RESETHAND and SA_RESTART unconditionally
Fri, 15 Jul 2011 06:55:35 -0600
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On 07/15/2011 04:28 AM, Pádraig Brady wrote:
> On 15/07/11 08:50, Paul Eggert wrote:
>> On 07/14/11 17:25, Pádraig Brady wrote:
>>> I'm not sure about defining these to 0 in gnulib.
>>> That will silently ignore the intent of a program on certain platforms.
> Absolutely. What I was getting was that it's probably better to leave
> the following to the app too:
> #ifndef SA_RESETHAND
> # define SA_RESETHAND 0
> /* Now the app writer knows they need to handle this case */
Can't the gnulib sigaction module be taught to fake SA_RESETHAND, by
wrapping the user's signal-handler inside a gnulib shim, where the shim
resets signals correctly before calling the user's handler? Granted,
it's not trivial, but I think that it is still within the realm of
technical possibilities. At which point, SA_RESETHAND would always be
non-zero once you use the gnulib <signal.h>.
>> On NonStop, if you invoke signal(), it uses the SA_RESETHAND semantics
>> (POSIX allows this). Conversely, if you invoke sigaction(), NonStop
>> always behaves as if SA_RESTART and SA_RESETHAND are zero, i.e., it
>> doesn't support either feature with sigaction.
> Thanks for checking that.
Seems like there's some room for improvement in the gnulib sigaction
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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bug#9076: coreutils-8.12 uses SA_RESETHAND and SA_RESTART unconditionally, Bruno Haible, 2011/07/15