/* 08 Nov 1998*/ /* * miscmod.c * * 08 Nov 1998 Rajesh Vaidheeswarran - adapted from the lkm miscmod.c * * Copyright (c) 1998 Rajesh Vaidheeswarran * 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 Rajesh Vaidheeswarran. * 4. The name Rajesh Vaidheeswarran may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY RAJESH VAIDHEESWARRAN ``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 RAJESH VAIDHEESWARRAN 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. * * * 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. */ #include #include #include #include #include #include #include #include #include "misccall.h" /* * These two entries define our system call and module information. We * have 0 arguments to our system call. */ static struct sysent newent = { 0, misccall /* # of args, function pointer*/ }; /* * Miscellaneous modules must have their own save areas... */ static struct sysent oldent; /* save area for old callslot entry*/ /* * Number of syscall entries for a.out executables */ #define nsysent (aout_sysvec.sv_size) /* * If you have a data structure to pass ... */ typedef struct misc_data { char name[20]; struct sysent * nent; struct sysent * oent; int offset; } misc_data_t; static misc_data_t misc_arg = { "misccall", &newent, &oldent, -1 }; static int misc_load(module_t, modeventtype_t, void *); static moduledata_t misc_mod = { "misc_mod", misc_load, (void *)&misc_arg /* This is our real data */ }; /* * This function is called each time the module is loaded or unloaded. * * For the system call table, we duplicate the code in the kern_lkm.c * file for patching into the system call table. We can tell what * has been allocated, etc. by virtue of the fact that we know the * criteria used by the system call loader interface. We still * kick out the copyright to the console here (to give an example). */ static int misc_load(mod, cmd, arg) module_t mod; modeventtype_t cmd; void * arg; { int i, err = 0; misc_data_t * args = (misc_data_t *)arg; switch (cmd) { case MOD_LOAD: /* * Search the table looking for a slot... */ for(i = 1; i < nsysent; i++) if(sysent[i].sy_call == (sy_call_t *)nosys) break; /* found it!*/ /* out of allocable slots?*/ if(i == nsysent) { err = ENFILE; break; } /* save old -- we must provide our own data area*/ bcopy(&sysent[i], args->oent, sizeof(struct sysent)); /* replace with new*/ bcopy(args->nent, &sysent[i], sizeof(struct sysent)); /* done!*/ args->offset = i; /* slot in sysent[]*/ /* if we make it to here, print copyright on console*/ printf("\nSample Loaded kld module (system call)\n"); printf("Copyright (c) 1998\n"); printf("Rajesh Vaidheeswarran\n"); printf("All rights reserved\n"); printf("System call %s loaded into slot %d\n", args->name, args->offset); break; /* Success*/ case MOD_UNLOAD: /* current slot...*/ i = args->offset; /* replace current slot contents with old contents*/ bcopy(args->oent, &sysent[ i], sizeof( struct sysent)); printf("Unloaded kld module (system call)\n"); break; /* Success*/ default: /* we only understand load/unload*/ err = EINVAL; break; } return(err); } /* Now declare the module to the system */ DECLARE_MODULE(misc, misc_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);