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#ifndef _XOPEN_EXTENDED
# define _XOPEN_EXTENDED
#endif

#include <stddef.h>
#include <signal.h>

--

#define sigaltstack(member)	offsetof (stack_t, member)

sizeSS				sizeof(stack_t)
oSS_SP				sigaltstack(ss_sp)
oSS_SIZE			sigaltstack(ss_size)
oSS_FLAGS			sigaltstack(ss_flags)