/*- * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93 * $FreeBSD$ */ /* * Indirect driver for controlling tty. */ #include "opt_mac.h" #include #include #include #include #include #include #include #include #include #include #include static d_open_t cttyopen; static d_read_t cttyread; static d_write_t cttywrite; static d_ioctl_t cttyioctl; static d_poll_t cttypoll; #define CDEV_MAJOR 1 static struct cdevsw ctty_cdevsw = { /* open */ cttyopen, /* close */ nullclose, /* read */ cttyread, /* write */ cttywrite, /* ioctl */ cttyioctl, /* poll */ cttypoll, /* mmap */ nommap, /* strategy */ nostrategy, /* name */ "ctty", /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ D_TTY, }; #define cttyvp(td) ((td)->td_proc->p_flag & P_CONTROLT ? (td)->td_proc->p_session->s_ttyvp : NULL) /*ARGSUSED*/ static int cttyopen(dev, flag, mode, td) dev_t dev; int flag, mode; struct thread *td; { struct vnode *ttyvp; int error; PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); ttyvp = cttyvp(td); SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); if (ttyvp == NULL) return (ENXIO); vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); #ifdef MAC error = mac_check_vnode_open(td->td_ucred, ttyvp, flag); if (error) { VOP_UNLOCK(ttyvp, 0, td); return (error); } #endif error = VOP_OPEN(ttyvp, flag, NOCRED, td); VOP_UNLOCK(ttyvp, 0, td); return (error); } /*ARGSUSED*/ static int cttyread(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct thread *td = uio->uio_td; register struct vnode *ttyvp; int error; PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); ttyvp = cttyvp(td); SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); if (ttyvp == NULL) return (EIO); vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); #ifdef MAC /* XXX: Shouldn't the cred below be td->td_ucred not NOCRED? */ error = mac_check_vnode_read(td->td_ucred, ttyvp); if (error == 0) #endif error = VOP_READ(ttyvp, uio, flag, NOCRED); VOP_UNLOCK(ttyvp, 0, td); return (error); } /*ARGSUSED*/ static int cttywrite(dev, uio, flag) dev_t dev; struct uio *uio; int flag; { struct thread *td = uio->uio_td; struct vnode *ttyvp; struct mount *mp; int error; PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); ttyvp = cttyvp(td); SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); if (ttyvp == NULL) return (EIO); mp = NULL; if (ttyvp->v_type != VCHR && (error = vn_start_write(ttyvp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); #ifdef MAC /* XXX: shouldn't the cred below be td->td_ucred not NOCRED? */ error = mac_check_vnode_write(td->td_ucred, ttyvp); if (error == 0) #endif error = VOP_WRITE(ttyvp, uio, flag, NOCRED); VOP_UNLOCK(ttyvp, 0, td); vn_finished_write(mp); return (error); } /*ARGSUSED*/ static int cttyioctl(dev, cmd, addr, flag, td) dev_t dev; u_long cmd; caddr_t addr; int flag; struct thread *td; { struct vnode *ttyvp; int error; PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); ttyvp = cttyvp(td); SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); if (ttyvp == NULL) return (EIO); if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */ return EINVAL; /* to controlling tty -- infinite recursion */ if (cmd == TIOCNOTTY) { PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); error = 0; if (!SESS_LEADER(td->td_proc)) td->td_proc->p_flag &= ~P_CONTROLT; else error = EINVAL; SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); return (error); } /* XXXMAC: Should this be td->td_ucred below? */ return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, td)); } /*ARGSUSED*/ static int cttypoll(dev, events, td) dev_t dev; int events; struct thread *td; { struct vnode *ttyvp; #ifdef MAC int error; #endif PROC_LOCK(td->td_proc); SESS_LOCK(td->td_proc->p_session); ttyvp = cttyvp(td); SESS_UNLOCK(td->td_proc->p_session); PROC_UNLOCK(td->td_proc); if (ttyvp == NULL) /* try operation to get EOF/failure */ return (seltrue(dev, events, td)); #ifdef MAC vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td); error = mac_check_vnode_poll(td->td_ucred, ttyvp); VOP_UNLOCK(ttyvp, 0, td); if (error) return (error); #endif return (VOP_POLL(ttyvp, events, td->td_ucred, td)); } static void ctty_clone(void *arg, char *name, int namelen, dev_t *dev); static dev_t ctty; static void ctty_clone(void *arg, char *name, int namelen, dev_t *dev) { struct vnode *vp; if (*dev != NODEV) return; if (strcmp(name, "tty")) return; vp = cttyvp(curthread); if (vp == NULL) { if (ctty) *dev = ctty; } else *dev = vp->v_rdev; } static void ctty_drvinit(void *unused); static void ctty_drvinit(unused) void *unused; { if (devfs_present) { EVENTHANDLER_REGISTER(dev_clone, ctty_clone, 0, 1000); ctty = make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "ctty"); } else { make_dev(&ctty_cdevsw, 0, 0, 0, 0666, "tty"); } } SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)