src/winsup/cygwin ChangeLog include/cygwin/sig ...

Eric Blake
Fri Oct 26 18:52:00 GMT 2012

On 10/26/2012 12:29 PM, Corinna Vinschen wrote:
> If there's no reason to keep space, I would opt for this implementation:
> #ifdef __x86_64__
> #define NSIG    65      /* signal 0 implied */
> #else
> #define NSIG    33      /* signal 0 implied */
> #endif
> /* Real-Time signals per SUSv3.  RT_SIGMAX in limits.h has to agree. */
> #define SIGRTMIN 32
> #define SIGRTMAX (NSIG - 1)
> It's not dynamic, but it doesn't seem to make a lot of sense to make it
> dynamic.  Even in the 32 bit case, if we change the number of available
> RT signals it can also occur together with the ABI change, so an old
> application would still have the old number of RT signals, despite any
> effort to make the number dynamic.  Me thinks.

Seems reasonable to me - if there is ever a new signal added, we'd also
want to add it to 32-bit cygwin, at which point we will have to tackle
the ABI problem, and can therefore tackle the ABI problem in both builds
at once.

Eric Blake    +1-919-301-3266
Libvirt virtualization library

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