read.c revision 1f79c0b880fa5add6fffbf5debc7996dbef5c1a3
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * CDDL HEADER START
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1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * See the License for the specific language governing permissions
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1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * When distributing Covered Code, include this CDDL HEADER in each
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1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo#pragma ident "%Z%%M% %I% %E% SMI"
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * Use is subject to license terms.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * read thread - Read from tcp client and write to vcc driver. There are one
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * writer and multiple readers per console. The first client who connects to
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * a console get write access. An error message is returned to readers if they
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * attemp to input commands. Read thread accepts special daemon commands from
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * all clients.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo/* write_vcc() - write to vcc virtual console */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo if (n < 0) {
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* write error */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * acquire_writer() the client is going to be writer.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo * insert the client to the head of the console client queue.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo D1(stderr, "t@%d:acuire_writer :client@%d\n", thr_self(),
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* clientp is a writer already */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* current writer */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo writerp = (vntsd_client_t *)(consp->clientpq->handle);
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* move client to be first in the console queue */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* move previous writer to be the second in the queue */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo rv = vntsd_que_insert_after(consp->clientpq, clientp, writerp);
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* write warning message to the writer */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo gettext("Warning: Console connection forced into read-only mode")))
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo/* interrupt handler */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo/* read from client */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo for (; ; ) {
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo switch (rv) {
823fe29b97090ae4962ebcc65cdaf0a757eb4851dtse * Based on telnet protocol, when an <eol> is entered,
823fe29b97090ae4962ebcc65cdaf0a757eb4851dtse * vntsd receives <0x0d,0x00>. However, console expects
823fe29b97090ae4962ebcc65cdaf0a757eb4851dtse * <0xd> only. We need to filter out <0x00>.
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo/* vntsd_read worker */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo D3(stderr, "t@%d vntsd_read@%d\n", thr_self(), clientp->sockfd);
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo for (; ; ) {
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* client input */
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * Only keyboard inputs from first connection to a
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * guest console should be accepted. Check to see if
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * this client is the first connection in console
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * Since this console connection is not the first
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * connection in the console queue,
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * it is operating in 'reader'
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse * mode, print warning and ignore the input.
1f79c0b880fa5add6fffbf5debc7996dbef5c1a3dtse /* check errors and interrupts */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo switch (rv) {
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /* write to vcc */
1ae0874509b6811fdde1dfd46f0d93fd09867a3fheppo /*NOTREACHED*/