writev(STDERR_FILENO, iov, (v - iov) + 1);
__writev(STDERR_FILENO, iov, (v - iov) + 1);
herror(s)	const char *s;{	struct iovec iov[4];	register struct iovec *v = iov;	if (s && *s) {		v->iov_base = (char *)s;		v->iov_len = strlen(s);		v++;		v->iov_base = ": ";		v->iov_len = 2;		v++;	}	v->iov_base = (char *)hstrerror(h_errno);	v->iov_len = strlen(v->iov_base);	v++;	v->iov_base = "\n";	v->iov_len = 1;	writev(STDERR_FILENO, iov, (v - iov) + 1);}