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ptyfs.c revision 1.4 
      1 /*	$NetBSD: ptyfs.c,v 1.4 2008/01/24 17:32:58 ad 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __RCSID("$NetBSD: ptyfs.c,v 1.4 2008/01/24 17:32:58 ad Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/types.h>
     44 #include <sys/time.h>
     45 #include <sys/proc.h>
     46 #include <sys/stat.h>
     47 #include <sys/vnode.h>
     48 #include <sys/mount.h>
     49 
     50 #include <stdbool.h>
     51 
     52 #define _KERNEL
     53 #include <miscfs/specfs/specdev.h>
     54 #include <fs/ptyfs/ptyfs.h>
     55 #undef _KERNEL
     56 
     57 #include <paths.h>
     58 #include <err.h>
     59 #include <kvm.h>
     60 #include <dirent.h>
     61 #include "fstat.h"
     62 
     63 int
     64 ptyfs_filestat(struct vnode *vp, struct filestat *fsp)
     65 {
     66 	struct ptyfsnode pn;
     67 	struct specnode sn;
     68 	struct mount mt;
     69 
     70 	if (!KVM_READ(VTOPTYFS(vp), &pn, sizeof(pn))) {
     71 		dprintf("can't read ptyfs_node at %p for pid %d",
     72 		    VTOPTYFS(vp), Pid);
     73 		return 0;
     74 	}
     75 	if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
     76 		dprintf("can't read mount at %p for pid %d",
     77 		    VTOPTYFS(vp), Pid);
     78 		return 0;
     79 	}
     80 	fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
     81 	fsp->fileid = (long)pn.ptyfs_fileno;
     82 	fsp->mode = pn.ptyfs_mode;
     83 	fsp->size = 0;
     84 	switch (pn.ptyfs_type) {
     85 	    case PTYFSpts:
     86 	    case PTYFSptc:
     87 		if (!KVM_READ(vp->v_specnode, &sn, sizeof(sn))) {
     88 			dprintf("can't read specnode at %p for pid %d",
     89 				vp->v_specnode, Pid);
     90 			return 0;
     91 		}
     92 		fsp->rdev = sn.sn_rdev;
     93 		fsp->mode |= S_IFCHR;
     94 		break;
     95 	    case PTYFSroot:
     96 		fsp->rdev = 0;
     97 		fsp->mode |= S_IFDIR;
     98 		break;
     99 	}
    100 
    101 	return 1;
    102 }
    103