#include <stddef.h>
#include <signal.h>
#include <sys/ucontext.h>

--

SIG_BLOCK
SIG_SETMASK

-- Offsets in ucontext_t.
#define ucontext(member)	offsetof (ucontext_t, member)
_UC_LINK		ucontext (uc_link)
_UC_STACK_SP		ucontext (uc_stack.ss_sp)
_UC_STACK_SIZE		ucontext (uc_stack.ss_size)
_UC_REGS_PTR		ucontext (uc_mcontext.uc_regs)
_UC_SIGMASK		ucontext (uc_sigmask)
_UC_REG_SPACE		ucontext (uc_reg_space)

-- Offsets in mcontext_t.
#define mcontext(member)	offsetof (mcontext_t, member)
_UC_GREGS		mcontext (gregs)
_UC_FREGS		mcontext (fpregs)
_UC_VREGS		mcontext (vrregs)
_UC_VREGS		mcontext (vrregs)
_UC_VSCR		mcontext (vrregs.vscr)
_UC_VRSAVE		mcontext (vrregs.vrsave)