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