sigset_t for new arches

[Joseph Myers]

On Mon, 13 Nov 2017, Vineet Gupta wrote:

> Hi,
> 
> This came to light when initial testing ARC port to glibc.
> 
> ARC glibc sigaction wrapper was failing as Linux kernel expects sa_mask
> (sigset_t) to be 2 words (for the asm-generic syscall ABI mandated for newer
> arches) while glibc defines it to be 32 words.

I think the userspace sigset_t is deliberately much larger, to allow for 
possible increase in the number of signals in future without breaking the 
glibc ABI.

-- 
Joseph S. Myers
joseph@codesourcery.com