/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* from S5R4 1.22 */ /* * Indirect driver for controlling tty. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define IS_STREAM(dev) (devopsp[getmajor(dev)]->devo_cb_ops->cb_str != NULL) int syopen(dev_t *, int, int, cred_t *); int syclose(dev_t, int, int, cred_t *); int syread(dev_t, struct uio *, cred_t *); int sywrite(dev_t, struct uio *, cred_t *); int sypoll(dev_t, short, int, short *, struct pollhead **); int syioctl(dev_t, int, intptr_t, int, cred_t *, int *); static int sy_info(dev_info_t *, ddi_info_cmd_t, void *, void **); static int sy_attach(dev_info_t *, ddi_attach_cmd_t); static dev_info_t *sy_dip; /* private copy of devinfo pointer */ struct cb_ops sy_cb_ops = { syopen, /* open */ syclose, /* close */ nodev, /* strategy */ nodev, /* print */ nodev, /* dump */ syread, /* read */ sywrite, /* write */ syioctl, /* ioctl */ nodev, /* devmap */ nodev, /* mmap */ nodev, /* segmap */ sypoll, /* poll */ ddi_prop_op, /* cb_prop_op */ 0, /* streamtab */ D_NEW | D_MP /* Driver compatibility flag */ }; struct dev_ops sy_ops = { DEVO_REV, /* devo_rev, */ 0, /* refcnt */ sy_info, /* info */ nulldev, /* identify */ nulldev, /* probe */ sy_attach, /* attach */ nodev, /* detach */ nodev, /* reset */ &sy_cb_ops, /* driver operations */ (struct bus_ops *)0, /* bus operations */ NULL, /* power */ ddi_quiesce_not_needed, /* quiesce */ }; extern int nodev(void); extern int nulldev(void); extern int dseekneg_flag; extern struct mod_ops mod_driverops; extern struct dev_ops sy_ops; /* * Module linkage information for the kernel. */ static struct modldrv modldrv = { &mod_driverops, /* Type of module. This one is a pseudo driver */ "Indirect driver for tty 'sy'", &sy_ops, /* driver ops */ }; static struct modlinkage modlinkage = { MODREV_1, &modldrv, NULL }; int _init(void) { return (mod_install(&modlinkage)); } int _fini(void) { return (mod_remove(&modlinkage)); } int _info(struct modinfo *modinfop) { return (mod_info(&modlinkage, modinfop)); } /* ARGSUSED */ static int sy_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) { if (ddi_create_minor_node(devi, "tty", S_IFCHR, 0, DDI_PSEUDO, 0) == DDI_FAILURE) { ddi_remove_minor_node(devi, NULL); return (-1); } sy_dip = devi; return (DDI_SUCCESS); } /* ARGSUSED */ static int sy_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) { dev_t dev = (dev_t)arg; int error; switch (infocmd) { case DDI_INFO_DEVT2DEVINFO: if (sy_dip == NULL) { *result = (void *)NULL; error = DDI_FAILURE; } else { *result = (void *) sy_dip; error = DDI_SUCCESS; } break; case DDI_INFO_DEVT2INSTANCE: if (getminor(dev) != 0) { *result = (void *)-1; error = DDI_FAILURE; } else { *result = (void *)0; error = DDI_SUCCESS; } break; default: error = DDI_FAILURE; } return (error); } /* ARGSUSED */ int syopen(dev_t *devp, int flag, int otyp, struct cred *cr) { dev_t ttyd; vnode_t *ttyvp; sess_t *sp; int error; if ((sp = tty_hold()) == NULL) return (EINTR); if (sp->s_dev == NODEV) { tty_rele(sp); return (ENXIO); } ttyd = sp->s_dev; ttyvp = sp->s_vp; /* * Open the control terminal. The control terminal may be * opened multiple times and it is closed in freectty(). * The multi-open, single-clone means that no cloning * can happen via this open, hence the assertion. */ error = VOP_OPEN(&ttyvp, FNOCTTY | flag, cr, NULL); if (error == 0) { struct snode *csp; /* * XXX: This driver binds a single minor number to the * current controlling tty of the process issueing the * open / close. If we implement a traditional close * for this driver then specfs will only invoke this driver * on the last close of our one minor number - which is not * what we want. Since we already get the open / close * semantic that we want from makectty and freectty, we reach * back into the common snode and decrease the open count so * that the specfs filtering of all but the last close * does not get in our way. To clean this up, a new cb_flag * that causes specfs to call the driver on each close * should be considered. */ ASSERT(ttyd == ttyvp->v_rdev); ASSERT(vn_matchops(ttyvp, spec_getvnodeops())); csp = VTOS(VTOS(ttyvp)->s_commonvp); mutex_enter(&csp->s_lock); ASSERT(csp->s_count > 1); csp->s_count--; mutex_exit(&csp->s_lock); } tty_rele(sp); return (error); } /* ARGSUSED */ int syclose(dev_t dev, int flag, int otyp, struct cred *cr) { return (0); } /* ARGSUSED */ int syread(dev_t dev, struct uio *uiop, struct cred *cr) { sess_t *sp; int error; if ((sp = tty_hold()) == NULL) return (EINTR); if (sp->s_dev == NODEV) { tty_rele(sp); return (ENXIO); } error = VOP_READ(sp->s_vp, uiop, 0, cr, NULL); tty_rele(sp); return (error); } /* ARGSUSED */ int sywrite(dev_t dev, struct uio *uiop, struct cred *cr) { sess_t *sp; int error; if ((sp = tty_hold()) == NULL) return (EINTR); if (sp->s_dev == NODEV) { tty_rele(sp); return (ENXIO); } error = VOP_WRITE(sp->s_vp, uiop, 0, cr, NULL); tty_rele(sp); return (error); } /* ARGSUSED */ int syioctl(dev_t dev, int cmd, intptr_t arg, int mode, struct cred *cr, int *rvalp) { sess_t *sp; int error; if (cmd == TIOCNOTTY) { /* * we can't allow this ioctl. the reason is that it * attempts to remove the ctty for a session. to do * this the ctty can't be in use but we grab a hold on * the current ctty (via tty_hold) to perform this ioctl. * if we were to allow this ioctl to pass through we * would deadlock with ourselves. */ return (EINVAL); } if ((sp = tty_hold()) == NULL) return (EINTR); if (sp->s_dev == NODEV) { tty_rele(sp); return (ENXIO); } error = VOP_IOCTL(sp->s_vp, cmd, arg, mode, cr, rvalp, NULL); tty_rele(sp); return (error); } /* ARGSUSED */ int sypoll(dev_t dev, short events, int anyyet, short *reventsp, struct pollhead **phpp) { sess_t *sp; int error; if ((sp = tty_hold()) == NULL) return (EINTR); if (sp->s_dev == NODEV) { tty_rele(sp); return (ENXIO); } error = VOP_POLL(sp->s_vp, events, anyyet, reventsp, phpp, NULL); tty_rele(sp); return (error); }