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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
        !            26: /*-
        !            27:  * Copyright (c) 1982, 1986, 1991, 1993, 1995
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)tty_tty.c   8.4 (Berkeley) 5/14/95
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * Indirect driver for controlling tty.
        !            63:  */
        !            64: #include <sys/param.h>
        !            65: #include <sys/systm.h>
        !            66: #include <sys/conf.h>
        !            67: #include <sys/ioctl.h>
        !            68: #include <sys/proc.h>
        !            69: #include <sys/tty.h>
        !            70: #include <sys/vnode.h>
        !            71: #include <sys/file.h>
        !            72: #ifndef NeXT
        !            73: #include <sys/kernel.h>
        !            74: #ifdef DEVFS
        !            75: #include <sys/devfsext.h>
        !            76: #endif /*DEVFS*/
        !            77: 
        !            78: static d_open_t        cttyopen;
        !            79: static d_read_t        cttyread;
        !            80: static d_write_t       cttywrite;
        !            81: static d_ioctl_t       cttyioctl;
        !            82: static d_select_t      cttyselect;
        !            83: 
        !            84: #define CDEV_MAJOR 1
        !            85: /* Don't make static, fdesc_vnops uses this. */
        !            86: struct cdevsw ctty_cdevsw = 
        !            87:        { cttyopen,     nullclose,      cttyread,       cttywrite,      /*1*/
        !            88:          cttyioctl,    nullstop,       nullreset,      nodevtotty,/* tty */
        !            89:          cttyselect,   nommap,         NULL,   "ctty", NULL,   -1 };
        !            90: 
        !            91: #endif /* !NeXT */
        !            92: 
        !            93: #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
        !            94: 
        !            95: /*ARGSUSED*/
        !            96: int
        !            97: cttyopen(dev, flag, mode, p)
        !            98:        dev_t dev;
        !            99:        int flag, mode;
        !           100:        struct proc *p;
        !           101: {
        !           102:        struct vnode *ttyvp = cttyvp(p);
        !           103:        int error;
        !           104: 
        !           105:        if (ttyvp == NULL)
        !           106:                return (ENXIO);
        !           107: #ifndef NeXT
        !           108:        VOP_LOCK(ttyvp);
        !           109: #else
        !           110:        /*
        !           111:         * This is the only place that NeXT Guarding has been used for
        !           112:         * VOP_.*LOCK style calls.  Note all of the other diffs should
        !           113:         * use the three paramater lock/unlock.
        !           114:         */
        !           115:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           116: #endif
        !           117: 
        !           118: #ifdef PARANOID
        !           119:        /*
        !           120:         * Since group is tty and mode is 620 on most terminal lines
        !           121:         * and since sessions protect terminals from processes outside
        !           122:         * your session, this check is probably no longer necessary.
        !           123:         * Since it inhibits setuid root programs that later switch
        !           124:         * to another user from accessing /dev/tty, we have decided
        !           125:         * to delete this test. (mckusick 5/93)
        !           126:         */
        !           127:        error = VOP_ACCESS(ttyvp,
        !           128:          (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
        !           129:        if (!error)
        !           130: #endif /* PARANOID */
        !           131:                error = VOP_OPEN(ttyvp, flag, NOCRED, p);
        !           132:        VOP_UNLOCK(ttyvp, 0, p);
        !           133:        return (error);
        !           134: }
        !           135: 
        !           136: /*ARGSUSED*/
        !           137: int
        !           138: cttyread(dev, uio, flag)
        !           139:        dev_t dev;
        !           140:        struct uio *uio;
        !           141:        int flag;
        !           142: {
        !           143:        struct proc *p = uio->uio_procp;
        !           144:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !           145:        int error;
        !           146: 
        !           147:        if (ttyvp == NULL)
        !           148:                return (EIO);
        !           149:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           150:        error = VOP_READ(ttyvp, uio, flag, NOCRED);
        !           151:        VOP_UNLOCK(ttyvp, 0, p);
        !           152:        return (error);
        !           153: }
        !           154: 
        !           155: /*ARGSUSED*/
        !           156: int
        !           157: cttywrite(dev, uio, flag)
        !           158:        dev_t dev;
        !           159:        struct uio *uio;
        !           160:        int flag;
        !           161: {
        !           162:        struct proc *p = uio->uio_procp;
        !           163:        register struct vnode *ttyvp = cttyvp(uio->uio_procp);
        !           164:        int error;
        !           165: 
        !           166:        if (ttyvp == NULL)
        !           167:                return (EIO);
        !           168:        vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
        !           169:        error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
        !           170:        VOP_UNLOCK(ttyvp, 0, p);
        !           171:        return (error);
        !           172: }
        !           173: 
        !           174: /*ARGSUSED*/
        !           175: #ifndef NeXT
        !           176: static int
        !           177: cttyioctl(dev, cmd, addr, flag, p)
        !           178:        dev_t dev;
        !           179:        int cmd;
        !           180:        caddr_t addr;
        !           181:        int flag;
        !           182:        struct proc *p;
        !           183: #else
        !           184: int
        !           185: cttyioctl(dev, cmd, addr, flag, p)
        !           186:        dev_t dev;
        !           187:        u_long cmd;
        !           188:        caddr_t addr;
        !           189:        int flag;
        !           190:        struct proc *p;
        !           191: #endif /* !NeXT */
        !           192: {
        !           193:        struct vnode *ttyvp = cttyvp(p);
        !           194: 
        !           195:        if (ttyvp == NULL)
        !           196:                return (EIO);
        !           197:        if (cmd == TIOCSCTTY)  /* don't allow controlling tty to be set    */
        !           198:                return EINVAL; /* to controlling tty -- infinite recursion */
        !           199:        if (cmd == TIOCNOTTY) {
        !           200:                if (!SESS_LEADER(p)) {
        !           201:                        p->p_flag &= ~P_CONTROLT;
        !           202:                        return (0);
        !           203:                } else
        !           204:                        return (EINVAL);
        !           205:        }
        !           206:        return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
        !           207: }
        !           208: 
        !           209: /*ARGSUSED*/
        !           210: int
        !           211: cttyselect(dev, flag, p)
        !           212:        dev_t dev;
        !           213:        int flag;
        !           214:        struct proc *p;
        !           215: {
        !           216:        struct vnode *ttyvp = cttyvp(p);
        !           217: 
        !           218:        if (ttyvp == NULL)
        !           219:                return (1);     /* try operation to get EOF/failure */
        !           220:        return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
        !           221: }
        !           222: 
        !           223: #ifndef NeXT
        !           224: static ctty_devsw_installed = 0;
        !           225: #ifdef DEVFS
        !           226: static         void    *ctty_devfs_token;
        !           227: #endif
        !           228: 
        !           229: static void
        !           230: ctty_drvinit(void *unused)
        !           231: {
        !           232:        dev_t dev;
        !           233: 
        !           234:        if( ! ctty_devsw_installed ) {
        !           235:                dev = makedev(CDEV_MAJOR,0);
        !           236:                cdevsw_add(&dev,&ctty_cdevsw,NULL);
        !           237:                ctty_devsw_installed = 1;
        !           238: #ifdef DEVFS
        !           239:                ctty_devfs_token = 
        !           240:                        devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0, 
        !           241:                                        0666, "tty");
        !           242: #endif
        !           243:        }
        !           244: }
        !           245: 
        !           246: SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
        !           247: 
        !           248: 
        !           249: #endif /* !NeXT */

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