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#include <signal.h>
#include <errno.h>
int sigaddset(sigset_t *set, int sig)
{
unsigned s = sig-1;
if (s >= _NSIG-1 || sig-32U < 3) {
errno = EINVAL;
return -1;
}
set->__bits[s/8/sizeof *set->__bits] |= 1UL<<(s&8*sizeof *set->__bits-1);
return 0;
}
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