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 */ > #endif 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 module then. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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