17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
59acbbeafSnn * Common Development and Distribution License (the "License").
69acbbeafSnn * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
2119397407SSherry Moore
227c478bd9Sstevel@tonic-gate /*
2319397407SSherry Moore * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
247c478bd9Sstevel@tonic-gate * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate */
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*a4ccb493SToomas Soome /* All Rights Reserved */
297c478bd9Sstevel@tonic-gate
307c478bd9Sstevel@tonic-gate
317c478bd9Sstevel@tonic-gate /* from S5R4 1.22 */
327c478bd9Sstevel@tonic-gate
337c478bd9Sstevel@tonic-gate /*
347c478bd9Sstevel@tonic-gate * Indirect driver for controlling tty.
357c478bd9Sstevel@tonic-gate */
367c478bd9Sstevel@tonic-gate #include <sys/types.h>
377c478bd9Sstevel@tonic-gate #include <sys/errno.h>
387c478bd9Sstevel@tonic-gate #include <sys/conf.h>
397c478bd9Sstevel@tonic-gate #include <sys/proc.h>
407c478bd9Sstevel@tonic-gate #include <sys/tty.h>
417c478bd9Sstevel@tonic-gate #include <sys/stream.h>
427c478bd9Sstevel@tonic-gate #include <sys/strsubr.h>
437c478bd9Sstevel@tonic-gate #include <sys/cred.h>
447c478bd9Sstevel@tonic-gate #include <sys/uio.h>
457c478bd9Sstevel@tonic-gate #include <sys/session.h>
467c478bd9Sstevel@tonic-gate #include <sys/ddi.h>
477c478bd9Sstevel@tonic-gate #include <sys/debug.h>
487c478bd9Sstevel@tonic-gate #include <sys/stat.h>
497c478bd9Sstevel@tonic-gate #include <sys/sunddi.h>
507c478bd9Sstevel@tonic-gate #include <sys/param.h>
517c478bd9Sstevel@tonic-gate #include <sys/systm.h>
527c478bd9Sstevel@tonic-gate #include <sys/modctl.h>
537c478bd9Sstevel@tonic-gate #include <sys/fs/snode.h>
547c478bd9Sstevel@tonic-gate #include <sys/file.h>
557c478bd9Sstevel@tonic-gate
567c478bd9Sstevel@tonic-gate #define IS_STREAM(dev) (devopsp[getmajor(dev)]->devo_cb_ops->cb_str != NULL)
577c478bd9Sstevel@tonic-gate
587c478bd9Sstevel@tonic-gate int syopen(dev_t *, int, int, cred_t *);
597c478bd9Sstevel@tonic-gate int syclose(dev_t, int, int, cred_t *);
607c478bd9Sstevel@tonic-gate int syread(dev_t, struct uio *, cred_t *);
617c478bd9Sstevel@tonic-gate int sywrite(dev_t, struct uio *, cred_t *);
627c478bd9Sstevel@tonic-gate int sypoll(dev_t, short, int, short *, struct pollhead **);
637c478bd9Sstevel@tonic-gate int syioctl(dev_t, int, intptr_t, int, cred_t *, int *);
647c478bd9Sstevel@tonic-gate
657c478bd9Sstevel@tonic-gate static int sy_info(dev_info_t *, ddi_info_cmd_t, void *, void **);
667c478bd9Sstevel@tonic-gate static int sy_attach(dev_info_t *, ddi_attach_cmd_t);
677c478bd9Sstevel@tonic-gate static dev_info_t *sy_dip; /* private copy of devinfo pointer */
687c478bd9Sstevel@tonic-gate
697c478bd9Sstevel@tonic-gate struct cb_ops sy_cb_ops = {
707c478bd9Sstevel@tonic-gate
717c478bd9Sstevel@tonic-gate syopen, /* open */
727c478bd9Sstevel@tonic-gate syclose, /* close */
737c478bd9Sstevel@tonic-gate nodev, /* strategy */
747c478bd9Sstevel@tonic-gate nodev, /* print */
757c478bd9Sstevel@tonic-gate nodev, /* dump */
767c478bd9Sstevel@tonic-gate syread, /* read */
777c478bd9Sstevel@tonic-gate sywrite, /* write */
787c478bd9Sstevel@tonic-gate syioctl, /* ioctl */
797c478bd9Sstevel@tonic-gate nodev, /* devmap */
807c478bd9Sstevel@tonic-gate nodev, /* mmap */
81*a4ccb493SToomas Soome nodev, /* segmap */
827c478bd9Sstevel@tonic-gate sypoll, /* poll */
837c478bd9Sstevel@tonic-gate ddi_prop_op, /* cb_prop_op */
847c478bd9Sstevel@tonic-gate 0, /* streamtab */
857c478bd9Sstevel@tonic-gate D_NEW | D_MP /* Driver compatibility flag */
867c478bd9Sstevel@tonic-gate
877c478bd9Sstevel@tonic-gate };
887c478bd9Sstevel@tonic-gate
897c478bd9Sstevel@tonic-gate struct dev_ops sy_ops = {
907c478bd9Sstevel@tonic-gate
917c478bd9Sstevel@tonic-gate DEVO_REV, /* devo_rev, */
927c478bd9Sstevel@tonic-gate 0, /* refcnt */
937c478bd9Sstevel@tonic-gate sy_info, /* info */
947c478bd9Sstevel@tonic-gate nulldev, /* identify */
957c478bd9Sstevel@tonic-gate nulldev, /* probe */
967c478bd9Sstevel@tonic-gate sy_attach, /* attach */
977c478bd9Sstevel@tonic-gate nodev, /* detach */
987c478bd9Sstevel@tonic-gate nodev, /* reset */
997c478bd9Sstevel@tonic-gate &sy_cb_ops, /* driver operations */
10019397407SSherry Moore (struct bus_ops *)0, /* bus operations */
10119397407SSherry Moore NULL, /* power */
10219397407SSherry Moore ddi_quiesce_not_needed, /* quiesce */
1037c478bd9Sstevel@tonic-gate };
1047c478bd9Sstevel@tonic-gate
1057c478bd9Sstevel@tonic-gate
1067c478bd9Sstevel@tonic-gate extern int nodev(void);
1077c478bd9Sstevel@tonic-gate extern int nulldev(void);
1087c478bd9Sstevel@tonic-gate extern int dseekneg_flag;
1097c478bd9Sstevel@tonic-gate extern struct mod_ops mod_driverops;
1107c478bd9Sstevel@tonic-gate extern struct dev_ops sy_ops;
1117c478bd9Sstevel@tonic-gate
1127c478bd9Sstevel@tonic-gate /*
1137c478bd9Sstevel@tonic-gate * Module linkage information for the kernel.
1147c478bd9Sstevel@tonic-gate */
1157c478bd9Sstevel@tonic-gate
1167c478bd9Sstevel@tonic-gate static struct modldrv modldrv = {
1177c478bd9Sstevel@tonic-gate &mod_driverops, /* Type of module. This one is a pseudo driver */
11819397407SSherry Moore "Indirect driver for tty 'sy'",
1197c478bd9Sstevel@tonic-gate &sy_ops, /* driver ops */
1207c478bd9Sstevel@tonic-gate };
1217c478bd9Sstevel@tonic-gate
1227c478bd9Sstevel@tonic-gate static struct modlinkage modlinkage = {
1237c478bd9Sstevel@tonic-gate MODREV_1,
1247c478bd9Sstevel@tonic-gate &modldrv,
1257c478bd9Sstevel@tonic-gate NULL
1267c478bd9Sstevel@tonic-gate };
1277c478bd9Sstevel@tonic-gate
1287c478bd9Sstevel@tonic-gate
1297c478bd9Sstevel@tonic-gate int
_init(void)1307c478bd9Sstevel@tonic-gate _init(void)
1317c478bd9Sstevel@tonic-gate {
1327c478bd9Sstevel@tonic-gate return (mod_install(&modlinkage));
1337c478bd9Sstevel@tonic-gate }
1347c478bd9Sstevel@tonic-gate
1357c478bd9Sstevel@tonic-gate
1367c478bd9Sstevel@tonic-gate int
_fini(void)1377c478bd9Sstevel@tonic-gate _fini(void)
1387c478bd9Sstevel@tonic-gate {
1397c478bd9Sstevel@tonic-gate return (mod_remove(&modlinkage));
1407c478bd9Sstevel@tonic-gate }
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate int
_info(struct modinfo * modinfop)1437c478bd9Sstevel@tonic-gate _info(struct modinfo *modinfop)
1447c478bd9Sstevel@tonic-gate {
1457c478bd9Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop));
1467c478bd9Sstevel@tonic-gate }
1477c478bd9Sstevel@tonic-gate
1487c478bd9Sstevel@tonic-gate /* ARGSUSED */
1497c478bd9Sstevel@tonic-gate static int
sy_attach(dev_info_t * devi,ddi_attach_cmd_t cmd)1507c478bd9Sstevel@tonic-gate sy_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
1517c478bd9Sstevel@tonic-gate {
1527c478bd9Sstevel@tonic-gate if (ddi_create_minor_node(devi, "tty", S_IFCHR,
153*a4ccb493SToomas Soome 0, DDI_PSEUDO, 0) == DDI_FAILURE) {
1547c478bd9Sstevel@tonic-gate ddi_remove_minor_node(devi, NULL);
1557c478bd9Sstevel@tonic-gate return (-1);
1567c478bd9Sstevel@tonic-gate }
1577c478bd9Sstevel@tonic-gate sy_dip = devi;
1587c478bd9Sstevel@tonic-gate return (DDI_SUCCESS);
1597c478bd9Sstevel@tonic-gate }
1607c478bd9Sstevel@tonic-gate
1617c478bd9Sstevel@tonic-gate /* ARGSUSED */
1627c478bd9Sstevel@tonic-gate static int
sy_info(dev_info_t * dip,ddi_info_cmd_t infocmd,void * arg,void ** result)1637c478bd9Sstevel@tonic-gate sy_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
1647c478bd9Sstevel@tonic-gate {
1657c478bd9Sstevel@tonic-gate dev_t dev = (dev_t)arg;
1667c478bd9Sstevel@tonic-gate int error;
1677c478bd9Sstevel@tonic-gate
1687c478bd9Sstevel@tonic-gate switch (infocmd) {
1697c478bd9Sstevel@tonic-gate case DDI_INFO_DEVT2DEVINFO:
1707c478bd9Sstevel@tonic-gate if (sy_dip == NULL) {
1717c478bd9Sstevel@tonic-gate *result = (void *)NULL;
1727c478bd9Sstevel@tonic-gate error = DDI_FAILURE;
1737c478bd9Sstevel@tonic-gate } else {
1747c478bd9Sstevel@tonic-gate *result = (void *) sy_dip;
1757c478bd9Sstevel@tonic-gate error = DDI_SUCCESS;
1767c478bd9Sstevel@tonic-gate }
1777c478bd9Sstevel@tonic-gate break;
1787c478bd9Sstevel@tonic-gate case DDI_INFO_DEVT2INSTANCE:
1797c478bd9Sstevel@tonic-gate if (getminor(dev) != 0) {
1807c478bd9Sstevel@tonic-gate *result = (void *)-1;
1817c478bd9Sstevel@tonic-gate error = DDI_FAILURE;
1827c478bd9Sstevel@tonic-gate } else {
1837c478bd9Sstevel@tonic-gate *result = (void *)0;
1847c478bd9Sstevel@tonic-gate error = DDI_SUCCESS;
1857c478bd9Sstevel@tonic-gate }
1867c478bd9Sstevel@tonic-gate break;
1877c478bd9Sstevel@tonic-gate default:
1887c478bd9Sstevel@tonic-gate error = DDI_FAILURE;
1897c478bd9Sstevel@tonic-gate }
1907c478bd9Sstevel@tonic-gate return (error);
1917c478bd9Sstevel@tonic-gate }
1927c478bd9Sstevel@tonic-gate
1937c478bd9Sstevel@tonic-gate
1947c478bd9Sstevel@tonic-gate /* ARGSUSED */
1957c478bd9Sstevel@tonic-gate int
syopen(dev_t * devp,int flag,int otyp,struct cred * cr)1967c478bd9Sstevel@tonic-gate syopen(dev_t *devp, int flag, int otyp, struct cred *cr)
1977c478bd9Sstevel@tonic-gate {
1987c478bd9Sstevel@tonic-gate dev_t ttyd;
1997c478bd9Sstevel@tonic-gate vnode_t *ttyvp;
2009acbbeafSnn sess_t *sp;
2017c478bd9Sstevel@tonic-gate int error;
2027c478bd9Sstevel@tonic-gate
2039acbbeafSnn if ((sp = tty_hold()) == NULL)
2049acbbeafSnn return (EINTR);
2059acbbeafSnn
2069acbbeafSnn if (sp->s_dev == NODEV) {
2079acbbeafSnn tty_rele(sp);
2087c478bd9Sstevel@tonic-gate return (ENXIO);
2097c478bd9Sstevel@tonic-gate }
2107c478bd9Sstevel@tonic-gate
2119acbbeafSnn ttyd = sp->s_dev;
2129acbbeafSnn ttyvp = sp->s_vp;
2139acbbeafSnn
2147c478bd9Sstevel@tonic-gate /*
2157c478bd9Sstevel@tonic-gate * Open the control terminal. The control terminal may be
2167c478bd9Sstevel@tonic-gate * opened multiple times and it is closed in freectty().
2177c478bd9Sstevel@tonic-gate * The multi-open, single-clone means that no cloning
2187c478bd9Sstevel@tonic-gate * can happen via this open, hence the assertion.
2197c478bd9Sstevel@tonic-gate */
220da6c28aaSamw error = VOP_OPEN(&ttyvp, FNOCTTY | flag, cr, NULL);
2217c478bd9Sstevel@tonic-gate if (error == 0) {
2227c478bd9Sstevel@tonic-gate struct snode *csp;
2237c478bd9Sstevel@tonic-gate
2247c478bd9Sstevel@tonic-gate /*
2257c478bd9Sstevel@tonic-gate * XXX: This driver binds a single minor number to the
2267c478bd9Sstevel@tonic-gate * current controlling tty of the process issueing the
2277c478bd9Sstevel@tonic-gate * open / close. If we implement a traditional close
2287c478bd9Sstevel@tonic-gate * for this driver then specfs will only invoke this driver
2297c478bd9Sstevel@tonic-gate * on the last close of our one minor number - which is not
2307c478bd9Sstevel@tonic-gate * what we want. Since we already get the open / close
2317c478bd9Sstevel@tonic-gate * semantic that we want from makectty and freectty, we reach
2327c478bd9Sstevel@tonic-gate * back into the common snode and decrease the open count so
2337c478bd9Sstevel@tonic-gate * that the specfs filtering of all but the last close
2347c478bd9Sstevel@tonic-gate * does not get in our way. To clean this up, a new cb_flag
2357c478bd9Sstevel@tonic-gate * that causes specfs to call the driver on each close
2367c478bd9Sstevel@tonic-gate * should be considered.
2377c478bd9Sstevel@tonic-gate */
2387c478bd9Sstevel@tonic-gate ASSERT(ttyd == ttyvp->v_rdev);
2397c478bd9Sstevel@tonic-gate ASSERT(vn_matchops(ttyvp, spec_getvnodeops()));
2407c478bd9Sstevel@tonic-gate csp = VTOS(VTOS(ttyvp)->s_commonvp);
2417c478bd9Sstevel@tonic-gate mutex_enter(&csp->s_lock);
2429acbbeafSnn ASSERT(csp->s_count > 1);
2437c478bd9Sstevel@tonic-gate csp->s_count--;
2447c478bd9Sstevel@tonic-gate mutex_exit(&csp->s_lock);
2457c478bd9Sstevel@tonic-gate }
2469acbbeafSnn
2479acbbeafSnn tty_rele(sp);
2487c478bd9Sstevel@tonic-gate return (error);
2497c478bd9Sstevel@tonic-gate }
2507c478bd9Sstevel@tonic-gate
2517c478bd9Sstevel@tonic-gate /* ARGSUSED */
2527c478bd9Sstevel@tonic-gate int
syclose(dev_t dev,int flag,int otyp,struct cred * cr)2537c478bd9Sstevel@tonic-gate syclose(dev_t dev, int flag, int otyp, struct cred *cr)
2547c478bd9Sstevel@tonic-gate {
2557c478bd9Sstevel@tonic-gate return (0);
2567c478bd9Sstevel@tonic-gate }
2577c478bd9Sstevel@tonic-gate
2587c478bd9Sstevel@tonic-gate /* ARGSUSED */
2597c478bd9Sstevel@tonic-gate int
syread(dev_t dev,struct uio * uiop,struct cred * cr)2607c478bd9Sstevel@tonic-gate syread(dev_t dev, struct uio *uiop, struct cred *cr)
2617c478bd9Sstevel@tonic-gate {
2629acbbeafSnn sess_t *sp;
2637c478bd9Sstevel@tonic-gate int error;
2647c478bd9Sstevel@tonic-gate
2659acbbeafSnn if ((sp = tty_hold()) == NULL)
2669acbbeafSnn return (EINTR);
2679acbbeafSnn
2689acbbeafSnn if (sp->s_dev == NODEV) {
2699acbbeafSnn tty_rele(sp);
2707c478bd9Sstevel@tonic-gate return (ENXIO);
2717c478bd9Sstevel@tonic-gate }
2727c478bd9Sstevel@tonic-gate
2739acbbeafSnn error = VOP_READ(sp->s_vp, uiop, 0, cr, NULL);
2749acbbeafSnn
2759acbbeafSnn tty_rele(sp);
2769acbbeafSnn return (error);
2777c478bd9Sstevel@tonic-gate }
2787c478bd9Sstevel@tonic-gate
2797c478bd9Sstevel@tonic-gate /* ARGSUSED */
2807c478bd9Sstevel@tonic-gate int
sywrite(dev_t dev,struct uio * uiop,struct cred * cr)2817c478bd9Sstevel@tonic-gate sywrite(dev_t dev, struct uio *uiop, struct cred *cr)
2827c478bd9Sstevel@tonic-gate {
2839acbbeafSnn sess_t *sp;
2847c478bd9Sstevel@tonic-gate int error;
2857c478bd9Sstevel@tonic-gate
2869acbbeafSnn if ((sp = tty_hold()) == NULL)
2879acbbeafSnn return (EINTR);
2889acbbeafSnn
2899acbbeafSnn if (sp->s_dev == NODEV) {
2909acbbeafSnn tty_rele(sp);
2917c478bd9Sstevel@tonic-gate return (ENXIO);
2927c478bd9Sstevel@tonic-gate }
2937c478bd9Sstevel@tonic-gate
2949acbbeafSnn error = VOP_WRITE(sp->s_vp, uiop, 0, cr, NULL);
2959acbbeafSnn
2969acbbeafSnn tty_rele(sp);
2977c478bd9Sstevel@tonic-gate return (error);
2987c478bd9Sstevel@tonic-gate }
2997c478bd9Sstevel@tonic-gate
3007c478bd9Sstevel@tonic-gate
3017c478bd9Sstevel@tonic-gate /* ARGSUSED */
3027c478bd9Sstevel@tonic-gate int
syioctl(dev_t dev,int cmd,intptr_t arg,int mode,struct cred * cr,int * rvalp)3037c478bd9Sstevel@tonic-gate syioctl(dev_t dev, int cmd, intptr_t arg, int mode, struct cred *cr,
304*a4ccb493SToomas Soome int *rvalp)
3057c478bd9Sstevel@tonic-gate {
3069acbbeafSnn sess_t *sp;
3077c478bd9Sstevel@tonic-gate int error;
3087c478bd9Sstevel@tonic-gate
3099acbbeafSnn if (cmd == TIOCNOTTY) {
3109acbbeafSnn /*
3119acbbeafSnn * we can't allow this ioctl. the reason is that it
3129acbbeafSnn * attempts to remove the ctty for a session. to do
3139acbbeafSnn * this the ctty can't be in use but we grab a hold on
3149acbbeafSnn * the current ctty (via tty_hold) to perform this ioctl.
3159acbbeafSnn * if we were to allow this ioctl to pass through we
3169acbbeafSnn * would deadlock with ourselves.
3179acbbeafSnn */
3189acbbeafSnn return (EINVAL);
3199acbbeafSnn }
3209acbbeafSnn
3219acbbeafSnn if ((sp = tty_hold()) == NULL)
3229acbbeafSnn return (EINTR);
3239acbbeafSnn
3249acbbeafSnn if (sp->s_dev == NODEV) {
3259acbbeafSnn tty_rele(sp);
3267c478bd9Sstevel@tonic-gate return (ENXIO);
3277c478bd9Sstevel@tonic-gate }
3289acbbeafSnn
329da6c28aaSamw error = VOP_IOCTL(sp->s_vp, cmd, arg, mode, cr, rvalp, NULL);
3309acbbeafSnn
3319acbbeafSnn tty_rele(sp);
3327c478bd9Sstevel@tonic-gate return (error);
3337c478bd9Sstevel@tonic-gate }
3347c478bd9Sstevel@tonic-gate
3357c478bd9Sstevel@tonic-gate
3367c478bd9Sstevel@tonic-gate
3377c478bd9Sstevel@tonic-gate /* ARGSUSED */
3387c478bd9Sstevel@tonic-gate int
sypoll(dev_t dev,short events,int anyyet,short * reventsp,struct pollhead ** phpp)3397c478bd9Sstevel@tonic-gate sypoll(dev_t dev, short events, int anyyet, short *reventsp,
340*a4ccb493SToomas Soome struct pollhead **phpp)
3417c478bd9Sstevel@tonic-gate {
3429acbbeafSnn sess_t *sp;
3437c478bd9Sstevel@tonic-gate int error;
3447c478bd9Sstevel@tonic-gate
3459acbbeafSnn if ((sp = tty_hold()) == NULL)
3469acbbeafSnn return (EINTR);
3479acbbeafSnn
3489acbbeafSnn if (sp->s_dev == NODEV) {
3499acbbeafSnn tty_rele(sp);
3507c478bd9Sstevel@tonic-gate return (ENXIO);
3517c478bd9Sstevel@tonic-gate }
3529acbbeafSnn
353da6c28aaSamw error = VOP_POLL(sp->s_vp, events, anyyet, reventsp, phpp, NULL);
3549acbbeafSnn
3559acbbeafSnn tty_rele(sp);
3567c478bd9Sstevel@tonic-gate return (error);
3577c478bd9Sstevel@tonic-gate }
358