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

--

SIG_BLOCK
SIG_UNBLOCK
SIG_SETMASK

#define ucontext(member)	offsetof (ucontext_t, member)
#define mcontext(member)	ucontext (uc_mcontext.member)

SC_FLGS		ucontext (uc_flags)
SC_LINK		ucontext (uc_link)
SC_STCK		ucontext (uc_stack.ss_sp)
SC_STSZ		ucontext (uc_stack.ss_size)
SC_PSW		mcontext (psw)
SC_GPRS		mcontext (gregs)
SC_ACRS		mcontext (aregs)
SC_FPC		mcontext (fpregs.fpc)
SC_FPRS		mcontext (fpregs.fprs)
SC_MASK		ucontext (uc_sigmask)