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#include <sys/signal.h>
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#define __SIGEMPTYSET 0
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#define __SIGFILLSET 0xffffffff
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#define __SIGADDSET(s, n) (*(s) |= 1 << ((n) - 1), 0)
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#define __SIGDELSET(s, n) (*(s) &= ~(1 << ((n) - 1)), 0)
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#define __SIGISMEMBER(s, n) ((*(s) & (1 << ((n) - 1))) != 0)