Another day, another file system.
dmesgfs is another example file system, which displays the device tree information gained from dmesg(8) as a directory hierarchy. The information can be displayed in files, or as targets of symbolic links. % l /mnt/mainbus0 total 320 drwxr-xr-x 2 agc agc 512 May 21 22:21 . drwxr-xr-x 2 root wheel 0 Jan 1 1970 .. drwxr-xr-x 2 agc agc 512 May 21 22:21 acpi0 lrwxr-xr-x 1 agc agc 41 May 21 22:21 cpu0 -> cpu0 at mainbus0 apid 0: (boot processor) lrwxr-xr-x 1 agc agc 40 May 21 22:21 ioapic -> ioapic at mainbus0 apid 1 not configured drwxr-xr-x 2 agc agc 512 May 21 22:21 pci0 % l /mnt/mainbus0/pci0/piixide0/atabus1/atapibus0 total 256 drwxr-xr-x 2 agc agc 512 May 21 22:21 . drwxr-xr-x 2 agc agc 512 May 21 22:21 .. lrwxr-xr-x 1 agc agc 31 May 21 22:21 Description -> atapibus0 at atabus1: 2 targets lrwxr-xr-x 1 agc agc 104 May 21 22:21 cd0 -> cd0 at atapibus0 drive 0: <VMware Virtual IDE CDROM Drive, 1000000000000000000, 0000000> cdrom removable %
This commit is contained in:
agc
parent
cfb41894f8
commit
d49e2683be
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@ -0,0 +1,13 @@
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# $NetBSD: Makefile,v 1.1 2007/05/21 21:29:23 agc Exp $
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PROG=dmesgfs
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SRCS=dmesgfs.c virtdir.c
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LDADD+= -lrefuse
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CPPFLAGS+= -g -I${.CURDIR}/../virtdir
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LDFLAGS+=-g
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MAN=dmesgfs.8
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WARNS=4
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.PATH: ${.CURDIR}/../virtdir
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.include <bsd.prog.mk>
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@ -0,0 +1,96 @@
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.\"
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.\" Copyright © 2007 Alistair Crooks. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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.\" GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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.\" SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 16, 2007
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.Dt DMESGFS 8
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.Os
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.Sh NAME
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.Nm dmesgfs
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.Nd refuse-based virtual file system to display devices found in dmesg
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl l
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.Op Fl n Ar nexus
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.Op Fl v
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.Ar mount_point
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.Sh DESCRIPTION
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The
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.Nm
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utility can be used to mount a virtual file system which
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shows the tree of devices present in the computer.
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This tree is found by using the output of the
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.Xr dmesg 8
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command.
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.Pp
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The following arguments can be used:
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.Bl -tag -width Ds
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.It Fl f
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present the attachment information in the virtual file system
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as files.
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.It Fl l
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present the attachment information in the virtual file system
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as symbolic links.
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This is the default mode of operation.
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.It Fl n Ar nexus
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Use the nexus name
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as the root of the device tree.
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The default value for Nexus is
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.Dq mainbus0 .
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.It Fl v
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Produce verbose output
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.El
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.Pp
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The
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.Nm
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utility makes use of the
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.Xr virtdir 3
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virtual directory routines.
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.Pp
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The
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.Xr refuse 3
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library is used to provide the file system features.
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.Pp
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The mandatory parameter is
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the local mount
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point.
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.Pp
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The
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.Xr dmesg 8
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utility is used to retrieve the information.
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.Sh SEE ALSO
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.Xr librefuse 3 ,
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.Xr puffs 3 ,
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.Xr virtdir 3 ,
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.Xr dmesg 8 .
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Nx 5.0 .
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.Sh AUTHORS
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.An Alistair Crooks Aq agc@NetBSD.org
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@ -0,0 +1,346 @@
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/*
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* Copyright © 2007 Alistair Crooks. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fuse.h>
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#include <regex.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "virtdir.h"
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#include "defs.h"
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static int verbose; /* how chatty are we? */
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static virtdir_t pci;
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/* a device node describes the device that is printed in the dmesg */
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typedef struct devicenode_t {
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char *dev; /* device name */
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int devlen; /* length of name */
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char *parent; /* its parent device name */
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int parentlen; /* length of parent name */
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char *descr; /* description of the device itself */
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int descrlen; /* length of description */
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int p; /* device node subscript of parent */
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int dir; /* nonzero if this is a directory */
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} devicenode_t;
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DEFINE_ARRAY(devices_t, devicenode_t);
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static devices_t devices;
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/* perform the stat operation */
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/* if this is the root, then just synthesise the data */
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static int
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dmesgfs_getattr(const char *path, struct stat *st)
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{
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virt_dirent_t *ep;
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if (strcmp(path, "/") == 0) {
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(void) memset(st, 0x0, sizeof(*st));
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st->st_mode = (S_IFDIR | 0755);
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st->st_nlink = 2;
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return 0;
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}
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if ((ep = virtdir_find(&pci, path, strlen(path))) == NULL) {
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return -ENOENT;
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}
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switch(ep->type) {
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case 'f':
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(void) memcpy(st, &pci.file, sizeof(*st));
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st->st_size = ep->tgtlen;
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st->st_mode = S_IFREG | 0644;
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break;
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case 'd':
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(void) memcpy(st, &pci.dir, sizeof(*st));
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break;
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case 'l':
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(void) memcpy(st, &pci.lnk, sizeof(*st));
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st->st_size = ep->tgtlen;
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st->st_mode = S_IFLNK | 0755;
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break;
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}
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st->st_ino = virtdir_offset(&pci, ep) + 10;
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return 0;
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}
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/* readdir operation */
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static int
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dmesgfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info * fi)
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{
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static VIRTDIR *dirp;
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virt_dirent_t *dp;
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if (offset == 0) {
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if ((dirp = openvirtdir(&pci, path)) == NULL) {
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return 0;
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}
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filler(buf, ".", NULL, 0);
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filler(buf, "..", NULL, 0);
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}
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while ((dp = readvirtdir(dirp)) != NULL) {
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if (filler(buf, dp->d_name, NULL, 0) != 0) {
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return 0;
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}
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}
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closevirtdir(dirp);
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dirp = NULL;
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return 0;
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}
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/* open the file in the file system */
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static int
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dmesgfs_open(const char *path, struct fuse_file_info * fi)
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{
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return 0;
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}
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/* read the file's contents in the file system */
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static int
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dmesgfs_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info * fi)
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{
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virt_dirent_t *ep;
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if ((ep = virtdir_find(&pci, path, strlen(path))) == NULL) {
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return -ENOENT;
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}
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if (ep->tgt == NULL) {
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return -ENOENT;
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}
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(void) memcpy(buf, &ep->tgt[offset], size);
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return ep->tgtlen;
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}
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/* fill in the statvfs struct */
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static int
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dmesgfs_statfs(const char *path, struct statvfs *st)
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{
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(void) memset(st, 0x0, sizeof(*st));
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return 0;
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}
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/* read the symbolic link */
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static int
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dmesgfs_readlink(const char *path, char *buf, size_t size)
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{
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virt_dirent_t *ep;
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if ((ep = virtdir_find(&pci, path, strlen(path))) == NULL) {
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return -ENOENT;
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}
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if (ep->tgt == NULL) {
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return -ENOENT;
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}
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(void) strlcpy(buf, ep->tgt, size);
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return 0;
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}
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/* operations struct */
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static struct fuse_operations dmesgfs_oper = {
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.getattr = dmesgfs_getattr,
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.readlink = dmesgfs_readlink,
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.readdir = dmesgfs_readdir,
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.open = dmesgfs_open,
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.read = dmesgfs_read,
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.statfs = dmesgfs_statfs
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};
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/* save `n' chars of `s' in malloc'd memory */
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static char *
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strnsave(const char *s, int n)
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{
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char *cp;
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if (n < 0) {
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n = strlen(s);
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}
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NEWARRAY(char, cp, n + 1, "strnsave", exit(EXIT_FAILURE));
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(void) memcpy(cp, s, n);
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cp[n] = 0x0;
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return cp;
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}
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/* find a device in the device node tree */
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static int
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finddev(const char *s, int len, int updir)
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{
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int i;
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for (i = 0 ; i < devices.c ; i++) {
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if (strncmp(devices.v[i].dev, s, len) == 0 &&
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devices.v[i].devlen == len) {
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if (updir) {
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devices.v[i].dir = 1;
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}
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return i;
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}
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}
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return -1;
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}
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/* add a device to the device node tree */
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static void
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add_dev(const char *dev, int len, const char *parent, int parentlen, const char *descr, int descrlen)
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{
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int d;
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if ((d = finddev(dev, len, 0)) < 0) {
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ALLOC(devicenode_t, devices.v, devices.size, devices.c, 10, 10, "add_dev", exit(EXIT_FAILURE));
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devices.v[devices.c].dev = strnsave(dev, len);
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devices.v[devices.c].devlen = len;
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devices.v[devices.c].parent = strnsave(parent, parentlen);
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devices.v[devices.c].parentlen = parentlen;
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devices.v[devices.c].descr = strnsave(descr, descrlen);
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devices.v[devices.c].descrlen = descrlen;
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devices.c += 1;
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}
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}
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/* print the parent device pathname */
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static int
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pparent(int d, char *buf, size_t size)
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{
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int cc;
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if (d != 0) {
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cc = pparent(devices.v[d].p, buf, size);
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size -= cc;
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}
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(void) strlcat(buf, "/", size);
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(void) strlcat(buf, devices.v[d].dev, size - 1);
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return devices.v[d].devlen + 1;
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}
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#define NEXUS_DESCRIPTION "Nexus - the root of everything"
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/* build up a fuse_tree from the information in the database */
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static int
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build_tree(virtdir_t *tp, const char *nexus, char type)
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{
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struct stat dir;
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struct stat f;
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regmatch_t matchv[10];
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regex_t r;
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FILE *pp;
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char buf[BUFSIZ];
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int i;
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int p;
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(void) stat(".", &dir);
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(void) memcpy(&f, &dir, sizeof(f));
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f.st_mode = S_IFREG | 0644;
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if (regcomp(&r, "^([a-z0-9]+) at ([a-z0-9]+)(.*)", REG_EXTENDED) != 0) {
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warn("can't compile regular expression\n");
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return 0;
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}
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if ((pp = popen("dmesg", "r")) == NULL) {
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return 0;
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}
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add_dev(nexus, strlen(nexus), nexus, strlen(nexus), NEXUS_DESCRIPTION,
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strlen(NEXUS_DESCRIPTION));
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while (fgets(buf, sizeof(buf), pp) != NULL) {
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if (type == 'l') {
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buf[strlen(buf) - 1] = 0x0;
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}
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if (regexec(&r, buf, 10, matchv, 0) == 0) {
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add_dev(&buf[matchv[1].rm_so],
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matchv[1].rm_eo - matchv[1].rm_so,
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&buf[matchv[2].rm_so],
|
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matchv[2].rm_eo - matchv[2].rm_so,
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||||
buf,
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matchv[0].rm_eo - matchv[0].rm_so);
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||||
}
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}
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printf("%d devices\n", devices.c);
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(void) pclose(pp);
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||||
for (i = 0 ; i < devices.c ; i++) {
|
||||
if ((p = finddev(devices.v[i].parent, devices.v[i].parentlen, 1)) < 0) {
|
||||
warn("No parent device for %s\n", devices.v[i].dev);
|
||||
}
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devices.v[i].p = p;
|
||||
}
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for (i = 0 ; i < devices.c ; i++) {
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||||
pparent(i, buf, sizeof(buf));
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||||
virtdir_add(tp, buf, strlen(buf),
|
||||
(devices.v[i].dir) ? 'd' : type,
|
||||
devices.v[i].descr, devices.v[i].descrlen);
|
||||
if (devices.v[i].dir) {
|
||||
(void) strlcat(buf, "/", sizeof(buf));
|
||||
(void) strlcat(buf, "Description", sizeof(buf));
|
||||
virtdir_add(tp, buf, strlen(buf), type,
|
||||
devices.v[i].descr, devices.v[i].descrlen);
|
||||
}
|
||||
if (verbose) {
|
||||
printf("dmesgfs: adding %s `%s' -> `%s'\n",
|
||||
(type == 'l') ? "symbolic link" : "file",
|
||||
buf, devices.v[i].descr);
|
||||
}
|
||||
buf[0] = 0x0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char **argv)
|
||||
{
|
||||
char *nexus;
|
||||
char type;
|
||||
int i;
|
||||
|
||||
nexus = NULL;
|
||||
type = 'l';
|
||||
while ((i = getopt(argc, argv, "fln:v")) != -1) {
|
||||
switch(i) {
|
||||
case 'f':
|
||||
type = 'f';
|
||||
break;
|
||||
case 'l':
|
||||
type = 'l';
|
||||
break;
|
||||
case 'n':
|
||||
nexus = optarg;
|
||||
break;
|
||||
case 'v':
|
||||
verbose += 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!build_tree(&pci, (nexus) ? nexus : "mainbus0", type)) {
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
return fuse_main(argc, argv, &dmesgfs_oper, NULL);
|
||||
}
|
||||
Loading…
Reference in New Issue