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298b1886b2
The kernel ABI sigset_t is smaller than the glibc one. Define the right-sized sigset_t and fixup the sigaction() wrapper to leverage it. The Sigaction wrapper here is not an ABI, so relax it (drop the "extern" and the "restorer" fields), the existing `k_sigaction` is the ABI sigaction struct. Linux defines `sigset_t` with a c_ulong, so it can be 32-bit or 64-bit, depending on the platform. This can make a difference on big-endian systems. Patch up `ucontext_t` so that this change doesn't impact its layout. AFAICT, its currently the glibc layout.