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

--

SIG_BLOCK
SIG_SETMASK

#define ucontext(member)	offsetof (ucontext_t, member)
#define mcontext(member)	ucontext (uc_mcontext.member)
#define mreg(reg)		mcontext (gregs[REG_##reg])

oLINK		ucontext (uc_link)
oSS_SP		ucontext (uc_stack.ss_sp)
oSS_SIZE	ucontext (uc_stack.ss_size)
oGS		mreg (GS)
oFS		mreg (FS)
oEDI		mreg (EDI)
oESI		mreg (ESI)
oEBP		mreg (EBP)
oESP		mreg (ESP)
oEBX		mreg (EBX)
oEIP		mreg (EIP)
oFPREGS		mcontext (fpregs)
oSIGMASK	ucontext (uc_sigmask)
oFPREGSMEM	ucontext (__fpregs_mem)