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 1.14 2008/04/28 20:24:05 martin 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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.14 2008/04/28 20:24:05 martin Exp $");
   31 
   32 #include "opt_ptm.h"
   33 
   34 #ifdef COMPAT_BSDPTY
   35 /* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/ioctl.h>
   40 #include <sys/lwp.h>
   41 #include <sys/tty.h>
   42 #include <sys/stat.h>
   43 #include <sys/file.h>
   44 #include <sys/uio.h>
   45 #include <sys/kernel.h>
   46 #include <sys/vnode.h>
   47 #include <sys/namei.h>
   48 #include <sys/signalvar.h>
   49 #include <sys/filedesc.h>
   50 #include <sys/conf.h>
   51 #include <sys/poll.h>
   52 #include <sys/malloc.h>
   53 #include <sys/pty.h>
   54 #include <sys/kauth.h>
   55 
   56 /*
   57  * pts == /dev/tty[pqrs]?
   58  * ptc == /dev/pty[pqrs]?
   59  */
   60 
   61 /*
   62  * All this hard-coding is really evil.
   63  */
   64 #define TTY_GID         4
   65 #define TTY_PERM        (S_IRUSR|S_IWUSR|S_IWGRP)
   66 #define TTY_TEMPLATE    "/dev/XtyXX"
   67 #define TTY_NAMESIZE    sizeof(TTY_TEMPLATE)
   68 #define TTY_LETTERS     "pqrstuvwxyzPQRST"
   69 #define TTY_OLD_SUFFIX  "0123456789abcdef"
   70 #define TTY_NEW_SUFFIX  "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
   71 
   72 static int pty_makename(struct ptm_pty *, struct lwp *, char *, size_t, dev_t,
   73     char);
   74 static int pty_allocvp(struct ptm_pty *, struct lwp *, struct vnode **,
   75     dev_t, char);
   76 static void pty_getvattr(struct ptm_pty *, struct lwp *, struct vattr *);
   77 
   78 struct ptm_pty ptm_bsdpty = {
   79         pty_allocvp,
   80         pty_makename,
   81         pty_getvattr,
   82         NULL
   83 };
   84 
   85 static int
   86 /*ARGSUSED*/
   87 pty_makename(struct ptm_pty *ptm, struct lwp *l, char *bf,
   88     size_t bufsiz, dev_t dev, char c)
   89 {
   90         size_t nt;
   91         dev_t minor = minor(dev);
   92         const char *suffix;
   93 
   94         if (bufsiz < TTY_NAMESIZE)
   95                 return EINVAL;
   96 
   97         (void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE);
   98 
   99         if (minor < 256) {
  100                 suffix = TTY_OLD_SUFFIX;
  101                 nt = sizeof(TTY_OLD_SUFFIX) - 1;
  102         } else {
  103                 minor -= 256;
  104                 suffix = TTY_NEW_SUFFIX;
  105                 nt = sizeof(TTY_NEW_SUFFIX) - 1;
  106         }
  107 
  108         bf[5] = c;
  109         bf[8] = TTY_LETTERS[minor / nt];
  110         bf[9] = suffix[minor % nt];
  111         return 0;
  112 }
  113 
  114 
  115 static int
  116 /*ARGSUSED*/
  117 pty_allocvp(struct ptm_pty *ptm, struct lwp *l, struct vnode **vp, dev_t dev,
  118     char ms)
  119 {
  120         int error;
  121         struct nameidata nd;
  122         char name[TTY_NAMESIZE];
  123 
  124         error = (*ptm->makename)(ptm, l, name, sizeof(name), dev, ms);
  125         if (error)
  126                 return error;
  127 
  128         NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, name);
  129         if ((error = namei(&nd)) != 0)
  130                 return error;
  131         *vp = nd.ni_vp;
  132         return 0;
  133 }
  134 
  135 
  136 static void
  137 /*ARGSUSED*/
  138 pty_getvattr(struct ptm_pty *ptm, struct lwp *l, struct vattr *vattr)
  139 {
  140         VATTR_NULL(vattr);
  141         /* get real uid */
  142         vattr->va_uid = kauth_cred_getuid(l->l_cred);
  143         vattr->va_gid = TTY_GID;
  144         vattr->va_mode = TTY_PERM;
  145 }
  146 #endif

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