uzero
uzero(iov->iov_base, iov->iov_len);
uzero((void *)end, zfoddiff);
uzero((void *)end, zfoddiff);
void uzero(void *, size_t);
uzero(fp, sizeof (siginfo_t));
uzero(fp, sizeof (si32));
uzero(sp, sizeof (siginfo_t));
uzero(sp, sizeof (siginfo32_t));
extern void uzero(void *addr, size_t count);