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#ifndef _XOPEN_EXTENDED
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# define _XOPEN_EXTENDED
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#endif
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#include <stddef.h>
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#include <signal.h>
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--
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#define sigaltstack(member) offsetof (stack_t, member)
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sizeSS sizeof (stack_t)
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oSS_SP sigaltstack (ss_sp)
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oSS_SIZE sigaltstack (ss_size)
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oSS_FLAGS sigaltstack (ss_flags)
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