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197 lines
6.4 KiB
C
197 lines
6.4 KiB
C
/* 08 Nov 1998*/
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/*
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* miscmod.c
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*
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* 08 Nov 1998 Rajesh Vaidheeswarran - adapted from the lkm miscmod.c
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*
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* Copyright (c) 1998 Rajesh Vaidheeswarran
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Rajesh Vaidheeswarran.
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* 4. The name Rajesh Vaidheeswarran 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 RAJESH VAIDHEESWARRAN ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE RAJESH VAIDHEESWARRAN BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Copyright (c) 1993 Terrence R. Lambert.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Terrence R. Lambert.
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* 4. The name Terrence R. Lambert 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 TERRENCE R. LAMBERT ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/exec.h>
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#include <sys/sysent.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/conf.h>
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#include "misccall.h"
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/*
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* These two entries define our system call and module information. We
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* have 0 arguments to our system call.
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*/
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static struct sysent newent = {
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0, misccall /* # of args, function pointer*/
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};
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/*
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* Miscellaneous modules must have their own save areas...
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*/
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static struct sysent oldent; /* save area for old callslot entry*/
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/*
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* Number of syscall entries for a.out executables
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*/
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#define nsysent (aout_sysvec.sv_size)
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/*
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* If you have a data structure to pass ...
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*/
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typedef struct misc_data {
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char name[20];
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struct sysent * nent;
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struct sysent * oent;
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int offset;
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} misc_data_t;
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static misc_data_t misc_arg = {
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"misccall",
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&newent,
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&oldent,
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-1
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};
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static int misc_load(module_t, modeventtype_t, void *);
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static moduledata_t misc_mod = {
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"misc_mod",
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misc_load,
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(void *)&misc_arg /* This is our real data */
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};
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/*
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* This function is called each time the module is loaded or unloaded.
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*
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* For the system call table, we duplicate the code in the kern_lkm.c
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* file for patching into the system call table. We can tell what
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* has been allocated, etc. by virtue of the fact that we know the
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* criteria used by the system call loader interface. We still
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* kick out the copyright to the console here (to give an example).
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*/
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static int
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misc_load(mod, cmd, arg)
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module_t mod;
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modeventtype_t cmd;
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void * arg;
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{
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int i, err = 0;
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misc_data_t * args = (misc_data_t *)arg;
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switch (cmd) {
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case MOD_LOAD:
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/*
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* Search the table looking for a slot...
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*/
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for(i = 1; i < nsysent; i++)
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if(sysent[i].sy_call == (sy_call_t *)nosys)
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break; /* found it!*/
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/* out of allocable slots?*/
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if(i == nsysent) {
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err = ENFILE;
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break;
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}
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/* save old -- we must provide our own data area*/
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bcopy(&sysent[i], args->oent, sizeof(struct sysent));
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/* replace with new*/
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bcopy(args->nent, &sysent[i], sizeof(struct sysent));
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/* done!*/
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args->offset = i; /* slot in sysent[]*/
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/* if we make it to here, print copyright on console*/
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printf("\nSample Loaded kld module (system call)\n");
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printf("Copyright (c) 1998\n");
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printf("Rajesh Vaidheeswarran\n");
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printf("All rights reserved\n");
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printf("System call %s loaded into slot %d\n", args->name,
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args->offset);
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break; /* Success*/
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case MOD_UNLOAD:
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/* current slot...*/
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i = args->offset;
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/* replace current slot contents with old contents*/
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bcopy(args->oent, &sysent[ i], sizeof( struct sysent));
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printf("Unloaded kld module (system call)\n");
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break; /* Success*/
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default: /* we only understand load/unload*/
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err = EINVAL;
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break;
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}
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return(err);
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}
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/* Now declare the module to the system */
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DECLARE_MODULE(misc, misc_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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