The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_bsdpty.c

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    1 /*      $NetBSD: tty_bsdpty.c,v 1.11 2006/11/01 10:17:59 yamt Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *        This product includes software developed by the NetBSD
   18  *        Foundation, Inc. and its contributors.
   19  * 4. Neither the name of The NetBSD Foundation nor the names of its
   20  *    contributors may be used to endorse or promote products derived
   21  *    from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33  * POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.11 2006/11/01 10:17:59 yamt Exp $");
   38 
   39 #include "opt_ptm.h"
   40 
   41 #ifdef COMPAT_BSDPTY
   42 /* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/ioctl.h>
   47 #include <sys/lwp.h>
   48 #include <sys/tty.h>
   49 #include <sys/stat.h>
   50 #include <sys/file.h>
   51 #include <sys/uio.h>
   52 #include <sys/kernel.h>
   53 #include <sys/vnode.h>
   54 #include <sys/namei.h>
   55 #include <sys/signalvar.h>
   56 #include <sys/uio.h>
   57 #include <sys/filedesc.h>
   58 #include <sys/conf.h>
   59 #include <sys/poll.h>
   60 #include <sys/malloc.h>
   61 #include <sys/pty.h>
   62 #include <sys/kauth.h>
   63 
   64 /*
   65  * pts == /dev/tty[pqrs]?
   66  * ptc == /dev/pty[pqrs]?
   67  */
   68 
   69 /*
   70  * All this hard-coding is really evil.
   71  */
   72 #define TTY_GID         4
   73 #define TTY_PERM        (S_IRUSR|S_IWUSR|S_IWGRP)
   74 #define TTY_TEMPLATE    "/dev/XtyXX"
   75 #define TTY_NAMESIZE    sizeof(TTY_TEMPLATE)
   76 #define TTY_LETTERS     "pqrstuvwxyzPQRST"
   77 #define TTY_OLD_SUFFIX  "0123456789abcdef"
   78 #define TTY_NEW_SUFFIX  "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
   79 
   80 static int pty_makename(struct ptm_pty *, struct lwp *, char *, size_t, dev_t,
   81     char);
   82 static int pty_allocvp(struct ptm_pty *, struct lwp *, struct vnode **,
   83     dev_t, char);
   84 static void pty_getvattr(struct ptm_pty *, struct lwp *, struct vattr *);
   85 
   86 struct ptm_pty ptm_bsdpty = {
   87         pty_allocvp,
   88         pty_makename,
   89         pty_getvattr,
   90         NULL
   91 };
   92 
   93 static int
   94 /*ARGSUSED*/
   95 pty_makename(struct ptm_pty *ptm, struct lwp *l, char *bf,
   96     size_t bufsiz, dev_t dev, char c)
   97 {
   98         size_t nt;
   99         dev_t minor = minor(dev);
  100         const char *suffix;
  101 
  102         if (bufsiz < TTY_NAMESIZE)
  103                 return EINVAL;
  104 
  105         (void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE);
  106 
  107         if (minor < 256) {
  108                 suffix = TTY_OLD_SUFFIX;
  109                 nt = sizeof(TTY_OLD_SUFFIX) - 1;
  110         } else {
  111                 minor -= 256;
  112                 suffix = TTY_NEW_SUFFIX;
  113                 nt = sizeof(TTY_NEW_SUFFIX) - 1;
  114         }
  115 
  116         bf[5] = c;
  117         bf[8] = TTY_LETTERS[minor / nt];
  118         bf[9] = suffix[minor % nt];
  119         return 0;
  120 }
  121 
  122 
  123 static int
  124 /*ARGSUSED*/
  125 pty_allocvp(struct ptm_pty *ptm, struct lwp *l, struct vnode **vp, dev_t dev,
  126     char ms)
  127 {
  128         int error;
  129         struct nameidata nd;
  130         char name[TTY_NAMESIZE];
  131 
  132         error = (*ptm->makename)(ptm, l, name, sizeof(name), dev, ms);
  133         if (error)
  134                 return error;
  135 
  136         NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, name, l);
  137         if ((error = namei(&nd)) != 0)
  138                 return error;
  139         *vp = nd.ni_vp;
  140         return 0;
  141 }
  142 
  143 
  144 static void
  145 /*ARGSUSED*/
  146 pty_getvattr(struct ptm_pty *ptm, struct lwp *l, struct vattr *vattr)
  147 {
  148         VATTR_NULL(vattr);
  149         /* get real uid */
  150         vattr->va_uid = kauth_cred_getuid(l->l_cred);
  151         vattr->va_gid = TTY_GID;
  152         vattr->va_mode = TTY_PERM;
  153 }
  154 #endif

Cache object: fd939aa134eb84eab404362df62ea9a4


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