Home | History | Annotate | Line # | Download | only in fstat 
      1 /*	$NetBSD: ptyfs.c,v 1.7 2017/06/09 00:13:29 chs 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 1.7 2017/06/09 00:13:29 chs 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 #define __EXPOSE_MOUNT
     42 #include <sys/mount.h>
     43 
     44 #include <stdbool.h>
     45 
     46 #define _KERNEL
     47 #include <miscfs/specfs/specdev.h>
     48 #include <fs/ptyfs/ptyfs.h>
     49 #undef _KERNEL
     50 
     51 #include <paths.h>
     52 #include <err.h>
     53 #include <kvm.h>
     54 #include <dirent.h>
     55 #include "fstat.h"
     56 
     57 int
     58 ptyfs_filestat(struct vnode *vp, struct filestat *fsp)
     59 {
     60 	struct ptyfsnode pn;
     61 	struct specnode sn;
     62 	struct mount mt;
     63 
     64 	if (!KVM_READ(VTOPTYFS(vp), &pn, sizeof(pn))) {
     65 		dprintf("can't read ptyfs_node at %p for pid %d",
     66 		    VTOPTYFS(vp), Pid);
     67 		return 0;
     68 	}
     69 	if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
     70 		dprintf("can't read mount at %p for pid %d",
     71 		    VTOPTYFS(vp), Pid);
     72 		return 0;
     73 	}
     74 	fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
     75 	fsp->fileid = pn.ptyfs_fileno;
     76 	fsp->mode = pn.ptyfs_mode;
     77 	fsp->size = 0;
     78 	switch (pn.ptyfs_type) {
     79 	    case PTYFSpts:
     80 	    case PTYFSptc:
     81 		if (!KVM_READ(vp->v_specnode, &sn, sizeof(sn))) {
     82 			dprintf("can't read specnode at %p for pid %d",
     83 				vp->v_specnode, Pid);
     84 			return 0;
     85 		}
     86 		fsp->rdev = sn.sn_rdev;
     87 		fsp->mode |= S_IFCHR;
     88 		break;
     89 	    case PTYFSroot:
     90 		fsp->rdev = 0;
     91 		fsp->mode |= S_IFDIR;
     92 		break;
     93 	}
     94 
     95 	return 1;
     96 }
     97