Function ttyoutq_setsize

freebsd/kern/tty_outq.c:94–124

}

int
ttyoutq_setsize(struct ttyoutq *to, struct tty *tp, size_t size)
{
	struct ttyoutq_block *tob;

	to->to_quota = howmany(size, TTYOUTQ_DATASIZE);

	while (to->to_quota > to->to_nblocks) {
		/*
		 * List is getting bigger.
		 * Add new blocks to the tail of the list.
		 *
		 * We must unlock the TTY temporarily, because we need
		 * to allocate memory. This won't be a problem, because
		 * in the worst case, another thread ends up here, which
		 * may cause us to allocate too many blocks, but this
		 * will be caught by the loop below.
		 */
		tty_unlock(tp);
		tob = uma_zalloc(ttyoutq_zone, M_WAITOK);
		tty_lock(tp);

		if (tty_gone(tp)) {
			uma_zfree(ttyoutq_zone, tob);
			return (ENXIO);
		}

		TTYOUTQ_INSERT_TAIL(to, tob);
	}
	return (0);
}

void
ttyoutq_free(struct ttyoutq *to)