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#include <stddef.h>
#include <signal.h>
#include <sys/ucontext.h>
--
SIG_BLOCK
SIG_UNBLOCK
SIG_SETMASK
_NSIG8 (_NSIG / 8)
#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)
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