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 1.17 2010/11/19 06:44:43 dholland 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 1.17 2010/11/19 06:44:43 dholland 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/pty.h>
   53 #include <sys/kauth.h>
   54 
   55 /*
   56  * pts == /dev/tty[pqrs]?
   57  * ptc == /dev/pty[pqrs]?
   58  */
   59 
   60 /*
   61  * All this hard-coding is really evil.
   62  */
   63 #define TTY_GID         4
   64 #define TTY_PERM        (S_IRUSR|S_IWUSR|S_IWGRP)
   65 #define TTY_TEMPLATE    "/dev/XtyXX"
   66 #define TTY_NAMESIZE    sizeof(TTY_TEMPLATE)
   67 #define TTY_LETTERS     "pqrstuvwxyzPQRST"
   68 #define TTY_OLD_SUFFIX  "0123456789abcdef"
   69 #define TTY_NEW_SUFFIX  "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
   70 
   71 static int pty_makename(struct ptm_pty *, struct lwp *, char *, size_t, dev_t,
   72     char);
   73 static int pty_allocvp(struct ptm_pty *, struct lwp *, struct vnode **,
   74     dev_t, char);
   75 static void pty_getvattr(struct ptm_pty *, struct lwp *, struct vattr *);
   76 
   77 struct ptm_pty ptm_bsdpty = {
   78         pty_allocvp,
   79         pty_makename,
   80         pty_getvattr,
   81         NULL
   82 };
   83 
   84 static int
   85 /*ARGSUSED*/
   86 pty_makename(struct ptm_pty *ptm, struct lwp *l, char *bf,
   87     size_t bufsiz, dev_t dev, char c)
   88 {
   89         size_t nt;
   90         dev_t minor = minor(dev);
   91         const char *suffix;
   92 
   93         if (bufsiz < TTY_NAMESIZE)
   94                 return EINVAL;
   95 
   96         (void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE);
   97 
   98         if (minor < 256) {
   99                 suffix = TTY_OLD_SUFFIX;
  100                 nt = sizeof(TTY_OLD_SUFFIX) - 1;
  101         } else {
  102                 minor -= 256;
  103                 suffix = TTY_NEW_SUFFIX;
  104                 nt = sizeof(TTY_NEW_SUFFIX) - 1;
  105         }
  106 
  107         bf[5] = c;
  108         bf[8] = TTY_LETTERS[minor / nt];
  109         bf[9] = suffix[minor % nt];
  110         return 0;
  111 }
  112 
  113 
  114 static int
  115 /*ARGSUSED*/
  116 pty_allocvp(struct ptm_pty *ptm, struct lwp *l, struct vnode **vp, dev_t dev,
  117     char ms)
  118 {
  119         int error;
  120         struct pathbuf *pb;
  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         pb = pathbuf_create(name);
  129         if (pb == NULL) {
  130                 return ENOMEM;
  131         }
  132 
  133         NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, pb);
  134         if ((error = namei(&nd)) != 0) {
  135                 pathbuf_destroy(pb);
  136                 return error;
  137         }
  138         *vp = nd.ni_vp;
  139         pathbuf_destroy(pb);
  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

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