bsd/kern/tty_tty.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
  29 /*-
  30  * Copyright (c) 1982, 1986, 1991, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)tty_tty.c   8.2 (Berkeley) 9/23/93
  62  */
  63
  64 /*
  65  * Indirect driver for controlling tty.
  66  */
  67 #include <sys/param.h>
  68 #include <sys/systm.h>
  69 #include <sys/conf.h>
  70 #include <sys/ioctl.h>
  71 #include <sys/proc_internal.h>
  72 #include <sys/tty.h>
  73 #include <sys/vnode_internal.h>
  74 #include <sys/file_internal.h>
  75 #ifndef NeXT
  76 #include <sys/kernel.h>
  77 #ifdef DEVFS
  78 #include <sys/devfsext.h>
  79 #endif /*DEVFS*/
  80
  81 static  d_open_t        cttyopen;
  82 static  d_read_t        cttyread;
  83 static  d_write_t       cttywrite;
  84 static  d_ioctl_t       cttyioctl;
  85 static  d_select_t      cttyselect;
  86
  87 #endif /* !NeXT */
  88
  89 /* Forward declarations for cdevsw[] entry */
  90 /* XXX we should consider making these static */
  91 int cttyopen(dev_t dev, int flag, int mode, struct proc *p);
  92 int cttyread(dev_t dev, struct uio *uio, int flag);
  93 int cttywrite(dev_t dev, struct uio *uio, int flag);
  94 int cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p);
  95 int cttyselect(dev_t dev, int flag, void* wql, struct proc *p);
  96
  97 #ifndef NeXT
  98
  99 #define CDEV_MAJOR 1
 100 /* Don't make static, fdesc_vnops uses this. */
 101 struct cdevsw ctty_cdevsw =
 102         { cttyopen,     nullclose,      cttyread,       cttywrite,      /*1*/
 103           cttyioctl,    nullstop,       nullreset,      nodevtotty,/* tty */
 104           cttyselect,   nommap,         NULL,   "ctty", NULL,   -1 };
 105
 106 #endif /* !NeXT */
 107
 108 #define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
 109
 110 /*ARGSUSED*/
 111 int
 112 cttyopen(__unused dev_t dev, int flag, __unused int mode, struct proc *p)
 113 {
 114         struct vnode *ttyvp = cttyvp(p);
 115         struct vfs_context context;
 116         int error;
 117
 118         if (ttyvp == NULL)
 119                 return (ENXIO);
 120
 121         context.vc_proc = p;
 122         context.vc_ucred = kauth_cred_proc_ref(p);
 123         error = VNOP_OPEN(ttyvp, flag, &context);
 124         kauth_cred_unref(&context.vc_ucred);
 125
 126         return (error);
 127 }
 128
 129 /*ARGSUSED*/
 130 int
 131 cttyread(__unused dev_t dev, struct uio *uio, int flag)
 132 {
 133         struct proc *p = current_proc();
 134         register struct vnode *ttyvp = cttyvp(p);
 135         struct vfs_context context;
 136         int error;
 137
 138         if (ttyvp == NULL)
 139                 return (EIO);
 140
 141         context.vc_proc = p;
 142         context.vc_ucred = NOCRED;
 143
 144         error = VNOP_READ(ttyvp, uio, flag, &context);
 145
 146         return (error);
 147 }
 148
 149 /*ARGSUSED*/
 150 int
 151 cttywrite(__unused dev_t dev, struct uio *uio, int flag)
 152 {
 153         struct proc *p = current_proc();
 154         register struct vnode *ttyvp = cttyvp(p);
 155         struct vfs_context context;
 156         int error;
 157
 158         if (ttyvp == NULL)
 159                 return (EIO);
 160
 161         context.vc_proc = p;
 162         context.vc_ucred = NOCRED;
 163
 164         error = VNOP_WRITE(ttyvp, uio, flag, &context);
 165
 166         return (error);
 167 }
 168
 169 /*ARGSUSED*/
 170 #ifndef NeXT
 171 static  int
 172 cttyioctl(dev, cmd, addr, flag, p)
 173         dev_t dev;
 174         int cmd;
 175         caddr_t addr;
 176         int flag;
 177         struct proc *p;
 178 #else
 179 int
 180 cttyioctl(__unused dev_t dev, u_long cmd, caddr_t addr, int flag,
 181         struct proc *p)
 182 #endif /* !NeXT */
 183 {
 184         struct vnode *ttyvp = cttyvp(p);
 185         struct vfs_context context;
 186
 187         if (ttyvp == NULL)
 188                 return (EIO);
 189         if (cmd == TIOCSCTTY)  /* don't allow controlling tty to be set    */
 190                 return EINVAL; /* to controlling tty -- infinite recursion */
 191         if (cmd == TIOCNOTTY) {
 192                 if (!SESS_LEADER(p)) {
 193                         p->p_flag &= ~P_CONTROLT;
 194                         return (0);
 195                 } else
 196                         return (EINVAL);
 197         }
 198         context.vc_proc = p;
 199         context.vc_ucred = NOCRED;
 200
 201         return (VNOP_IOCTL(ttyvp, cmd, addr, flag, &context));
 202 }
 203
 204 /*ARGSUSED*/
 205 int
 206 cttyselect(__unused dev_t dev, int flag, void* wql, struct proc *p)
 207 {
 208         struct vnode *ttyvp = cttyvp(p);
 209         struct vfs_context context;
 210
 211         context.vc_proc = p;
 212         context.vc_ucred = NOCRED;
 213
 214         if (ttyvp == NULL)
 215                 return (1);     /* try operation to get EOF/failure */
 216         return (VNOP_SELECT(ttyvp, flag, FREAD|FWRITE, wql, &context));
 217 }
 218
 219 #ifndef NeXT
 220 static ctty_devsw_installed = 0;
 221 #ifdef DEVFS
 222 static  void    *ctty_devfs_token;
 223 #endif
 224
 225 static void
 226 ctty_drvinit(void *unused)
 227 {
 228         dev_t dev;
 229
 230         if( ! ctty_devsw_installed ) {
 231                 dev = makedev(CDEV_MAJOR,0);
 232                 cdevsw_add(&dev,&ctty_cdevsw,NULL);
 233                 ctty_devsw_installed = 1;
 234 #ifdef DEVFS
 235                 ctty_devfs_token =
 236                         devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
 237                                         0666, "tty");
 238 #endif
 239         }
 240 }
 241
 242 SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
 243
 244
 245 #endif /* !NeXT */