d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Terry Lambert's loadable kernel module support - modload & modunload

Browse Source 
utilities w/improvements from the NetBSD group.
This commit is contained in:
David Greenman 1994-08-19 12:07:23 +00:00
parent 3edb235c09
commit eeabb58ec9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2125
9 changed files with 744 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sbin/Makefile
View File

@ -3,8 +3,8 @@
# XXX MISSING: fsdb icheck ncheck
# XXX NEEDS CONVERSION: scsiformat
SUBDIR= badsect clri disklabel dmesg dump dumpfs dumplfs fastboot \
fsck ifconfig init mknod mount mount_cd9660 mount_fdesc \
mount_kernfs mount_lfs mount_nfs mount_null mount_portal \
fsck ifconfig init mknod modload modunload mount mount_cd9660 \
mount_fdesc mount_kernfs mount_lfs mount_nfs mount_null mount_portal \
mount_procfs mount_umap mount_union mountd newfs newlfs nfsd \
nfsiod nologin ping quotacheck reboot restore route savecore \
shutdown slattach startslip swapon tunefs umount

42
sbin/modload/Makefile Normal file
View File

@ -0,0 +1,42 @@
#
# Makefile for modload
#
# 25 May 93 Terry Lambert Original
#
# Copyright (c) 1993 Terrence R. Lambert.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by Terrence R. Lambert.
# 4. The name Terrence R. Lambert may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id: Makefile,v 1.4 1994/02/09 15:00:32 deraadt Exp $
#
PROG= modload
MAN8= modload.8
.include <bsd.prog.mk>

115
sbin/modload/modload.8 Normal file
View File

@ -0,0 +1,115 @@
.\" Copyright (c) 1993 Christopher G. Demetriou
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $Id: modload.8,v 1.3 1994/01/29 01:43:30 jtc Exp $
.\"
.Dd June 7, 1993
.Dt MODLOAD 8
.Os NetBSD 0.8a
.Sh NAME
.Nm modload
.Nd load a kernel module
.Sh SYNOPSIS
.Nm modload
.Op Fl dv
.Op Fl A Ar kernel
.Op Fl e Ar entry
.Op Fl p Ar postinstall
.Op Fl o Ar output_file
.Ar input_file
.Sh DESCRIPTION
The
.Nm
utility loads a loadable kernel module into a running system.
The input file is an object file (.o file).
.Pp
The options to
.Nm
are as follows:
.Bl -tag -width indent
.It Fl d
Debug. Used to debug
.Nm
itself.
.It Fl v
Print comments about the loading process.
.It Fl A Ar kernel
Specify the file that is passed to the linker
to resolve module references to external symbols.
The symbol file must be for the currently running
kernel or the module is likely to crash the system.
.It Fl e Ar entry
Specify the module entry point.
This is passed by
.Nm
to
.Xr ld 1
when the module is linked.
The default module entry point name is `xxxinit'.
.It Fl p Ar postinstall
Specify the name of a shell script or program that will
be executed if the module is successfully loaded. It
is always passed the module id (in decimal) and module
type (in hexadecimal) as the first two arguments.
For loadable drivers, the third and fourth arguments are
the block major and character major numbers respectively.
For a loadable system call, the third argument is the system
call number.
.It Fl o Ar output_file
Specify the name of the output file that is produced by
the linker.
.El
.Sh FILES
.Bl -tag -width /usr/include/sys/lkm.h -compact
.It Pa /netbsd
default file passed to the linker to resolve external
references in the module
.It Pa /usr/include/sys/lkm.h
file containing definitions of module types
.\" .It Pa output file.
.\" default output file name
.Sh DIAGNOSTICS
The
.Nm
utility exits with a status of 0 on success
and with a nonzero status if an error occurs.
.Sh SEE ALSO
.Xr ld 1 ,
.Xr lkm 4 ,
.Xr modunload 8 ,
.Xr modstat 8
.Sh HISTORY
The
.Nm
command was designed to be similar in functionality
to the corresponding command in
.Tn "SunOS 4.1.3" .
.Sh AUTHOR
.Bl -tag
Terrence R. Lambert, terry@cs.weber.edu
.El
.Sh BUGS
Loadable streams modules and loadable execution interpreters
are not currently supported.

335
sbin/modload/modload.c Normal file
View File

@ -0,0 +1,335 @@
/*
* Copyright (c) 1993 Terrence R. Lambert.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: modload.c,v 1.9 1994/05/23 05:42:41 cgd Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <a.out.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/lkm.h>
#include <sys/file.h>
#include <sys/errno.h>
#include "pathnames.h"
#ifndef DFLT_ENTRY
#define DFLT_ENTRY "xxxinit"
#endif /* !DFLT_ENTRY */
#define min(a, b) ((a) < (b) ? (a) : (b))
/*
* Expected linker options:
*
* -A executable to link against
* -e entry point
* -o output file
* -T address to link to in hex (assumes it's a page boundry)
* <target> object file
*/
#define LINKCMD "ld -A %s -e _%s -o %s -T %x %s"
int debug = 0;
int verbose = 0;
int
linkcmd(kernel, entry, outfile, address, object)
char *kernel, *entry, *outfile;
u_int address; /* XXX */
char *object;
{
char cmdbuf[1024];
int error = 0;
sprintf(cmdbuf, LINKCMD, kernel, entry, outfile, address, object);
if (debug)
printf("%s\n", cmdbuf);
switch (system(cmdbuf)) {
case 0: /* SUCCESS! */
break;
case 1: /* uninformitive error */
/*
* Someone needs to fix the return values from the NetBSD
* ld program -- it's totally uninformative.
*
* No such file (4 on SunOS)
* Can't write output (2 on SunOS)
* Undefined symbol (1 on SunOS)
* etc.
*/
case 127: /* can't load shell */
case 32512:
default:
error = 1;
break;
}
return error;
}
void
usage()
{
fprintf(stderr, "usage:\n");
fprintf(stderr, "modload [-d] [-v] [-A <kernel>] [-e <entry]\n");
fprintf(stderr,
"[-p <postinstall>] [-o <output file>] <input file>\n");
exit(1);
}
int fileopen = 0;
#define DEV_OPEN 0x01
#define MOD_OPEN 0x02
#define PART_RESRV 0x04
int devfd, modfd;
struct lmc_resrv resrv;
void
cleanup()
{
if (fileopen & PART_RESRV) {
/*
* Free up kernel memory
*/
if (ioctl(devfd, LMUNRESRV, 0) == -1)
warn("can't release slot 0x%08x memory", resrv.slot);
}
if (fileopen & DEV_OPEN)
close(devfd);
if (fileopen & MOD_OPEN)
close(modfd);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int c;
char *kname = _PATH_UNIX;
char *entry = DFLT_ENTRY;
char *post = NULL;
char *out = NULL;
char *modobj;
char modout[80], *p;
struct exec info_buf;
u_int modsize; /* XXX */
u_int modentry; /* XXX */
struct lmc_loadbuf ldbuf;
int sz, bytesleft;
char buf[MODIOBUF];
while ((c = getopt(argc, argv, "dvA:e:p:o:")) != EOF) {
switch (c) {
case 'd':
debug = 1;
break; /* debug */
case 'v':
verbose = 1;
break; /* verbose */
case 'A':
kname = optarg;
break; /* kernel */
case 'e':
entry = optarg;
break; /* entry point */
case 'p':
post = optarg;
break; /* postinstall */
case 'o':
out = optarg;
break; /* output file */
case '?':
usage();
default:
printf("default!\n");
break;
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
modobj = argv[0];
atexit(cleanup);
/*
* Open the virtual device device driver for exclusive use (needed
* to write the new module to it as our means of getting it in the
* kernel).
*/
if ((devfd = open(_PATH_LKM, O_RDWR, 0)) == -1)
err(3, _PATH_LKM);
fileopen |= DEV_OPEN;
strcpy(modout, modobj);
p = strchr(modout, '.');
if (!p || strcmp(p, ".o"))
errx(2, "module object must end in .o");
if (out == NULL) {
out = modout;
*p == 0;
}
/*
* Prelink to get file size
*/
if (linkcmd(kname, entry, out, 0, modobj))
errx(1, "can't prelink `%s' creating `%s'", modobj, out);
/*
* Pre-open the 0-linked module to get the size information
*/
if ((modfd = open(out, O_RDONLY, 0)) == -1)
err(4, out);
fileopen |= MOD_OPEN;
/*
* Get the load module post load size... do this by reading the
* header and doing page counts.
*/
if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
err(3, "read `%s'", out);
/*
* Close the dummy module -- we have our sizing information.
*/
close(modfd);
fileopen &= ~MOD_OPEN;
/*
* Magic number...
*/
if (N_BADMAG(info_buf))
errx(4, "not an a.out format file");
/*
* Calculate the size of the module
*/
modsize = info_buf.a_text + info_buf.a_data + info_buf.a_bss;
/*
* Reserve the required amount of kernel memory -- this may fail
* to be successful.
*/
resrv.size = modsize; /* size in bytes */
resrv.name = modout; /* objname w/o ".o" */
resrv.slot = -1; /* returned */
resrv.addr = 0; /* returned */
if (ioctl(devfd, LMRESERV, &resrv) == -1)
err(9, "can't reserve memory");
fileopen |= PART_RESRV;
/*
* Relink at kernel load address
*/
if (linkcmd(kname, entry, out, resrv.addr, modobj))
errx(1, "can't link `%s' creating `%s' bound to 0x%08x",
modobj, out, resrv.addr);
/*
* Open the relinked module to load it...
*/
if ((modfd = open(out, O_RDONLY, 0)) == -1)
err(4, out);
fileopen |= MOD_OPEN;
/*
* Reread the header to get the actual entry point *after* the
* relink.
*/
if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
err(3, "read `%s'", out);
/*
* Get the entry point (for initialization)
*/
modentry = info_buf.a_entry; /* place to call */
/*
* Seek to the text offset to start loading...
*/
if (lseek(modfd, N_TXTOFF(info_buf), 0) == -1)
err(12, "lseek");
/*
* Transfer the relinked module to kernel memory in chunks of
* MODIOBUF size at a time.
*/
for (bytesleft = info_buf.a_text + info_buf.a_data;
bytesleft > 0;
bytesleft -= sz) {
sz = min(bytesleft, MODIOBUF);
read(modfd, buf, sz);
ldbuf.cnt = sz;
ldbuf.data = buf;
if (ioctl(devfd, LMLOADBUF, &ldbuf) == -1)
err(11, "error transferring buffer");
}
/*
* Save ourselves before disaster (potentitally) strikes...
*/
sync();
/*
* Trigger the module as loaded by calling the entry procedure;
* this will do all necessary table fixup to ensure that state
* is maintained on success, or blow everything back to ground
* zero on failure.
*/
if (ioctl(devfd, LMREADY, &modentry) == -1)
err(14, "error initializing module");
/*
* Success!
*/
fileopen &= ~PART_RESRV; /* loaded */
printf("Module loaded as ID %d\n", resrv.slot);
return 0;
}

3
sbin/modload/pathnames.h Normal file
View File

@ -0,0 +1,3 @@
#include <paths.h>
#define _PATH_LKM "/dev/lkm"

42
sbin/modunload/Makefile Normal file
View File

@ -0,0 +1,42 @@
#
# Makefile for modunload
#
# 25 May 93 Terry Lambert Original
#
# Copyright (c) 1993 Terrence R. Lambert.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by Terrence R. Lambert.
# 4. The name Terrence R. Lambert may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id: Makefile,v 1.4 1994/02/09 15:00:35 deraadt Exp $
#
PROG= modunload
MAN8= modunload.8
.include <bsd.prog.mk>

76
sbin/modunload/modunload.8 Normal file
View File

@ -0,0 +1,76 @@
.\" Copyright (c) 1993 Christopher G. Demetriou
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $Id: modunload.8,v 1.2 1994/01/29 01:43:35 jtc Exp $
.\"
.Dd June 7, 1993
.Dt MODUNLOAD 8
.Os NetBSD 0.8a
.Sh NAME
.Nm modunload
.Nd unload a kernel module
.Sh SYNOPSIS
.Nm modunload
.Op Fl i Ar id
.Op Fl n Ar name
.Sh DESCRIPTION
The
.Nm
utility unloads a loadable kernel module from a running system.
The
.Ar id
or
.Ar name
is the ID or name of the module as shown by
.Xr modstat 8 .
.Pp
One of the following options must be specified:
.Bl -tag -width indent
.It Fl i Ar id
Unload the module with the ID
.Ar id .
.It Fl n Ar name
Unload the module with the name
.Ar name .
.El
.Sh DIAGNOSTICS
The
.Nm
utility exits with a status of 0 on success
and with a nonzero status if an error occurs.
.Sh SEE ALSO
.Xr lkm 4 ,
.Xr modunload 8 ,
.Xr modstat 8
.Sh HISTORY
The
.Nm
command was designed to be similar in functionality
to the corresponding command in
.Tn "SunOS 4.1.3" .
.Sh AUTHOR
.Bl -tag
Terrence R. Lambert, terry@cs.weber.edu
.El

126
sbin/modunload/modunload.c Normal file
View File

@ -0,0 +1,126 @@
/*
* Copyright (c) 1993 Terrence R. Lambert.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: modunload.c,v 1.6 1994/05/23 05:42:58 cgd Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <string.h>
#include <a.out.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/lkm.h>
#include <sys/file.h>
#include <sys/errno.h>
#include "pathnames.h"
void
usage()
{
fprintf(stderr, "usage:\n");
fprintf(stderr, "modunload [-i <module id>] [-n <module name>]\n");
exit(1);
}
int devfd;
void
cleanup()
{
close(devfd);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int c;
int modnum = -1;
char *modname = NULL;
struct lmc_unload ulbuf;
while ((c = getopt(argc, argv, "i:n:")) != EOF) {
switch (c) {
case 'i':
modnum = atoi(optarg);
break; /* number */
case 'n':
modname = optarg;
break; /* name */
case '?':
usage();
default:
printf("default!\n");
break;
}
}
argc -= optind;
argv += optind;
if (argc != 0 || (modnum == -1 && modname == NULL))
usage();
/*
* Open the virtual device device driver for exclusive use (needed
* to ioctl() to retrive the loaded module(s) status).
*/
if ((devfd = open(_PATH_LKM, O_RDWR, 0)) == -1)
err(2, _PATH_LKM);
atexit(cleanup);
/*
* Unload the requested module.
*/
ulbuf.name = modname;
ulbuf.id = modnum;
if (ioctl(devfd, LMUNLOAD, &ulbuf) == -1) {
switch (errno) {
case EINVAL: /* out of range */
errx(3, "id out of range");
case ENOENT: /* no such entry */
errx(3, "no such module");
default: /* other error (EFAULT, etc) */
err(5, "LMUNLOAD");
}
}
return 0;
}

3
sbin/modunload/pathnames.h Normal file
View File

@ -0,0 +1,3 @@
#include <paths.h>
#define _PATH_LKM "/dev/lkm"