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Annotation of XNU/bsd/kern/tty_tty.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
        !            23: /*-
        !            24:  * Copyright (c) 1982, 1986, 1991, 1993
        !            25:  *      The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * Redistribution and use in source and binary forms, with or without
        !            28:  * modification, are permitted provided that the following conditions
        !            29:  * are met:
        !            30:  * 1. Redistributions of source code must retain the above copyright
        !            31:  *    notice, this list of conditions and the following disclaimer.
        !            32:  * 2. Redistributions in binary form must reproduce the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer in the
        !            34:  *    documentation and/or other materials provided with the distribution.
        !            35:  * 3. All advertising materials mentioning features or use of this software
        !            36:  *    must display the following acknowledgement:
        !            37:  *      This product includes software developed by the University of
        !            38:  *      California, Berkeley and its contributors.
        !            39:  * 4. Neither the name of the University nor the names of its contributors
        !            40:  *    may be used to endorse or promote products derived from this software
        !            41:  *    without specific prior written permission.
        !            42:  *
        !            43:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            44:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            45:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            46:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            47:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            48:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            49:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            50:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            51:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            52:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            53:  * SUCH DAMAGE.
        !            54:  *
        !            55:  *     @(#)tty_tty.c   8.2 (Berkeley) 9/23/93
        !            56:  */
        !            57: 
        !            58: /*
        !            59:  * Indirect driver for controlling tty.
        !            60:  */
        !            61: #include <sys/param.h>
        !            62: #include <sys/systm.h>
        !            63: #include <sys/conf.h>
        !            64: #include <sys/ioctl.h>
        !            65: #include <sys/proc.h>
        !            66: #include <sys/tty.h>
        !            67: #include <sys/vnode.h>
        !            68: #include <sys/file.h>
        !            69: #ifndef NeXT
        !            70: #include <sys/kernel.h>
        !            71: #ifdef DEVFS
        !            72: #include <sys/devfsext.h>
        !            73: #endif /*DEVFS*/
        !            74: 
        !            75: static d_open_t        cttyopen;
        !            76: static d_read_t        cttyread;
        !            77: static d_write_t       cttywrite;
        !            78: static d_ioctl_t       cttyioctl;
        !            79: static d_select_t      cttyselect;
        !            80: 
        !            81: #define CDEV_MAJOR 1
        !            82: /* Don't make static, fdesc_vnops uses this. */
        !            83: struct cdevsw ctty_cdevsw = 
        !            84:        { cttyopen,     nullclose,      cttyread,       cttywrite,      /*1*/
        !            85:          cttyioctl,    nullstop,       nullreset,      nodevtotty,/* tty */
        !            86:          cttyselect,   nommap,         NULL,   "ctty", NULL,   -1 };
        !            87: 
        !            88: #endif /* !NeXT */
        !            89: 
        !            90: #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
        !            91: 
        !            92: /*ARGSUSED*/
        !            93: int
        !            94: cttyopen(dev, flag, mode, p)
        !            95:        dev_t dev;
        !            96:        int flag, mode;
        !            97:        struct proc *p;
        !            98: {
        !            99:        struct vnode *ttyvp = cttyvp(p);
        !           100:        int error;
        !           101: 
        !           102:        if (ttyvp == NULL)
        !           103:                return (ENXIO);
        !           104: #ifndef NeXT
        !           105:        VOP_LOCK(ttyvp);
        !           106: #else
        !           107:        /*
        !           108:         * This is the only place that NeXT Guarding has been used for
        !           109:         * VOP_.*LOCK style calls.  Note all of the other diffs should
        !           110:         * use the three paramater lock/unlock.
        !           111:         */
        !           112:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           113: #endif
        !           114: 
        !           115: #ifdef PARANOID
        !           116:        /*
        !           117:         * Since group is tty and mode is 620 on most terminal lines
        !           118:         * and since sessions protect terminals from processes outside
        !           119:         * your session, this check is probably no longer necessary.
        !           120:         * Since it inhibits setuid root programs that later switch
        !           121:         * to another user from accessing /dev/tty, we have decided
        !           122:         * to delete this test. (mckusick 5/93)
        !           123:         */
        !           124:        error = VOP_ACCESS(ttyvp,
        !           125:          (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
        !           126:        if (!error)
        !           127: #endif /* PARANOID */
        !           128:                error = VOP_OPEN(ttyvp, flag, NOCRED, p);
        !           129:        VOP_UNLOCK(ttyvp, 0, p);
        !           130:        return (error);
        !           131: }
        !           132: 
        !           133: /*ARGSUSED*/
        !           134: int
        !           135: cttyread(dev, uio, flag)
        !           136:        dev_t dev;
        !           137:        struct uio *uio;
        !           138:        int flag;
        !           139: {
        !           140:        struct proc *p = uio->uio_procp;
        !           141:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !           142:        int error;
        !           143: 
        !           144:        if (ttyvp == NULL)
        !           145:                return (EIO);
        !           146:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           147:        error = VOP_READ(ttyvp, uio, flag, NOCRED);
        !           148:        VOP_UNLOCK(ttyvp, 0, p);
        !           149:        return (error);
        !           150: }
        !           151: 
        !           152: /*ARGSUSED*/
        !           153: int
        !           154: cttywrite(dev, uio, flag)
        !           155:        dev_t dev;
        !           156:        struct uio *uio;
        !           157:        int flag;
        !           158: {
        !           159:        struct proc *p = uio->uio_procp;
        !           160:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !           161:        int error;
        !           162: 
        !           163:        if (ttyvp == NULL)
        !           164:                return (EIO);
        !           165:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           166:        error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
        !           167:        VOP_UNLOCK(ttyvp, 0, p);
        !           168:        return (error);
        !           169: }
        !           170: 
        !           171: /*ARGSUSED*/
        !           172: #ifndef NeXT
        !           173: static int
        !           174: cttyioctl(dev, cmd, addr, flag, p)
        !           175:        dev_t dev;
        !           176:        int cmd;
        !           177:        caddr_t addr;
        !           178:        int flag;
        !           179:        struct proc *p;
        !           180: #else
        !           181: int
        !           182: cttyioctl(dev, cmd, addr, flag, p)
        !           183:        dev_t dev;
        !           184:        u_long cmd;
        !           185:        caddr_t addr;
        !           186:        int flag;
        !           187:        struct proc *p;
        !           188: #endif /* !NeXT */
        !           189: {
        !           190:        struct vnode *ttyvp = cttyvp(p);
        !           191: 
        !           192:        if (ttyvp == NULL)
        !           193:                return (EIO);
        !           194:        if (cmd == TIOCSCTTY)  /* don't allow controlling tty to be set    */
        !           195:                return EINVAL; /* to controlling tty -- infinite recursion */
        !           196:        if (cmd == TIOCNOTTY) {
        !           197:                if (!SESS_LEADER(p)) {
        !           198:                        p->p_flag &= ~P_CONTROLT;
        !           199:                        return (0);
        !           200:                } else
        !           201:                        return (EINVAL);
        !           202:        }
        !           203:        return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
        !           204: }
        !           205: 
        !           206: /*ARGSUSED*/
        !           207: int
        !           208: cttyselect(dev, flag, p)
        !           209:        dev_t dev;
        !           210:        int flag;
        !           211:        struct proc *p;
        !           212: {
        !           213:        struct vnode *ttyvp = cttyvp(p);
        !           214: 
        !           215:        if (ttyvp == NULL)
        !           216:                return (1);     /* try operation to get EOF/failure */
        !           217:        return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
        !           218: }
        !           219: 
        !           220: #ifndef NeXT
        !           221: static ctty_devsw_installed = 0;
        !           222: #ifdef DEVFS
        !           223: static         void    *ctty_devfs_token;
        !           224: #endif
        !           225: 
        !           226: static void
        !           227: ctty_drvinit(void *unused)
        !           228: {
        !           229:        dev_t dev;
        !           230: 
        !           231:        if( ! ctty_devsw_installed ) {
        !           232:                dev = makedev(CDEV_MAJOR,0);
        !           233:                cdevsw_add(&dev,&ctty_cdevsw,NULL);
        !           234:                ctty_devsw_installed = 1;
        !           235: #ifdef DEVFS
        !           236:                ctty_devfs_token = 
        !           237:                        devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 
        !           238:                                        0666, "tty");
        !           239: #endif
        !           240:        }
        !           241: }
        !           242: 
        !           243: SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
        !           244: 
        !           245: 
        !           246: #endif /* !NeXT */

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