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typedef struct {¡¡¡¡unsigned long sig[_NSIG_WORDS]£»¡¡¡¡} sigset_t
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sigset_t base_mask, waiting_mask, old_mask;
sigemptyset(&base_mask);
sigaddset(&base_mask, SIGQUIT);
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#define sigaddset(set, signo) (*(set) |= 1 < < ((signo) - 1), 0)
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