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Diffstat (limited to 'share/examples/kld/misc/module/miscmod.c')
| -rw-r--r-- | share/examples/kld/misc/module/miscmod.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/share/examples/kld/misc/module/miscmod.c b/share/examples/kld/misc/module/miscmod.c new file mode 100644 index 0000000..07be90f --- /dev/null +++ b/share/examples/kld/misc/module/miscmod.c @@ -0,0 +1,197 @@ +/* 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 <sys/param.h> +#include <sys/systm.h> +#include <sys/sysproto.h> +#include <sys/exec.h> +#include <sys/sysent.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/conf.h> + +#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); |
