usr.bin/fstat/ptyfs.c

   1 /*      $NetBSD: ptyfs.c,v 1.5 2008/04/28 20:24:12 martin Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: ptyfs.c,v 1.5 2008/04/28 20:24:12 martin Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38 #include <sys/proc.h>
  39 #include <sys/stat.h>
  40 #include <sys/vnode.h>
  41 #include <sys/mount.h>
  42
  43 #include <stdbool.h>
  44
  45 #define _KERNEL
  46 #include <miscfs/specfs/specdev.h>
  47 #include <fs/ptyfs/ptyfs.h>
  48 #undef _KERNEL
  49
  50 #include <paths.h>
  51 #include <err.h>
  52 #include <kvm.h>
  53 #include <dirent.h>
  54 #include "fstat.h"
  55
  56 int
  57 ptyfs_filestat(struct vnode *vp, struct filestat *fsp)
  58 {
  59         struct ptyfsnode pn;
  60         struct specnode sn;
  61         struct mount mt;
  62
  63         if (!KVM_READ(VTOPTYFS(vp), &pn, sizeof(pn))) {
  64                 dprintf("can't read ptyfs_node at %p for pid %d",
  65                     VTOPTYFS(vp), Pid);
  66                 return 0;
  67         }
  68         if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
  69                 dprintf("can't read mount at %p for pid %d",
  70                     VTOPTYFS(vp), Pid);
  71                 return 0;
  72         }
  73         fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
  74         fsp->fileid = pn.ptyfs_fileno;
  75         fsp->mode = pn.ptyfs_mode;
  76         fsp->size = 0;
  77         switch (pn.ptyfs_type) {
  78             case PTYFSpts:
  79             case PTYFSptc:
  80                 if (!KVM_READ(vp->v_specnode, &sn, sizeof(sn))) {
  81                         dprintf("can't read specnode at %p for pid %d",
  82                                 vp->v_specnode, Pid);
  83                         return 0;
  84                 }
  85                 fsp->rdev = sn.sn_rdev;
  86                 fsp->mode |= S_IFCHR;
  87                 break;
  88             case PTYFSroot:
  89                 fsp->rdev = 0;
  90                 fsp->mode |= S_IFDIR;
  91                 break;
  92         }
  93
  94         return 1;
  95 }