| 1 | /* $NetBSD: sysmon_wdog.c,v 1.29 2015/12/14 01:08:47 pgoyette Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2000 Zembu Labs, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Author: Jason R. Thorpe <thorpej@zembu.com> |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed by Zembu Labs, Inc. |
| 20 | * 4. Neither the name of Zembu Labs nor the names of its employees may |
| 21 | * be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS |
| 25 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR- |
| 26 | * RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- |
| 27 | * CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Watchdog timer framework for sysmon. Hardware (and software) |
| 38 | * watchdog timers can register themselves here to provide a |
| 39 | * watchdog function, which provides an abstract interface to the |
| 40 | * user. |
| 41 | */ |
| 42 | |
| 43 | #include <sys/cdefs.h> |
| 44 | __KERNEL_RCSID(0, "$NetBSD: sysmon_wdog.c,v 1.29 2015/12/14 01:08:47 pgoyette Exp $" ); |
| 45 | |
| 46 | #include <sys/param.h> |
| 47 | #include <sys/conf.h> |
| 48 | #include <sys/errno.h> |
| 49 | #include <sys/fcntl.h> |
| 50 | #include <sys/condvar.h> |
| 51 | #include <sys/mutex.h> |
| 52 | #include <sys/callout.h> |
| 53 | #include <sys/kernel.h> |
| 54 | #include <sys/systm.h> |
| 55 | #include <sys/proc.h> |
| 56 | #include <sys/module.h> |
| 57 | #include <sys/once.h> |
| 58 | |
| 59 | #include <dev/sysmon/sysmonvar.h> |
| 60 | |
| 61 | static LIST_HEAD(, sysmon_wdog) sysmon_wdog_list = |
| 62 | LIST_HEAD_INITIALIZER(&sysmon_wdog_list); |
| 63 | static int sysmon_wdog_count; |
| 64 | static kmutex_t sysmon_wdog_list_mtx, sysmon_wdog_mtx; |
| 65 | static kcondvar_t sysmon_wdog_cv; |
| 66 | static struct sysmon_wdog *sysmon_armed_wdog; |
| 67 | static callout_t sysmon_wdog_callout; |
| 68 | static void *sysmon_wdog_sdhook; |
| 69 | static void *sysmon_wdog_cphook; |
| 70 | |
| 71 | struct sysmon_wdog *sysmon_wdog_find(const char *); |
| 72 | void sysmon_wdog_release(struct sysmon_wdog *); |
| 73 | int sysmon_wdog_setmode(struct sysmon_wdog *, int, u_int); |
| 74 | void sysmon_wdog_ktickle(void *); |
| 75 | void sysmon_wdog_critpoll(void *); |
| 76 | void sysmon_wdog_shutdown(void *); |
| 77 | void sysmon_wdog_ref(struct sysmon_wdog *); |
| 78 | |
| 79 | static struct sysmon_opvec sysmon_wdog_opvec = { |
| 80 | sysmonopen_wdog, sysmonclose_wdog, sysmonioctl_wdog, |
| 81 | NULL, NULL, NULL |
| 82 | }; |
| 83 | |
| 84 | MODULE(MODULE_CLASS_DRIVER, sysmon_wdog, "sysmon" ); |
| 85 | |
| 86 | ONCE_DECL(once_wdog); |
| 87 | |
| 88 | static int |
| 89 | wdog_preinit(void) |
| 90 | { |
| 91 | |
| 92 | mutex_init(&sysmon_wdog_list_mtx, MUTEX_DEFAULT, IPL_NONE); |
| 93 | mutex_init(&sysmon_wdog_mtx, MUTEX_DEFAULT, IPL_SOFTCLOCK); |
| 94 | cv_init(&sysmon_wdog_cv, "wdogref" ); |
| 95 | callout_init(&sysmon_wdog_callout, 0); |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | int |
| 101 | sysmon_wdog_init(void) |
| 102 | { |
| 103 | int error; |
| 104 | |
| 105 | (void)RUN_ONCE(&once_wdog, wdog_preinit); |
| 106 | |
| 107 | sysmon_wdog_sdhook = shutdownhook_establish(sysmon_wdog_shutdown, NULL); |
| 108 | if (sysmon_wdog_sdhook == NULL) |
| 109 | printf("WARNING: unable to register watchdog shutdown hook\n" ); |
| 110 | sysmon_wdog_cphook = critpollhook_establish(sysmon_wdog_critpoll, NULL); |
| 111 | if (sysmon_wdog_cphook == NULL) |
| 112 | printf("WARNING: unable to register watchdog critpoll hook\n" ); |
| 113 | |
| 114 | error = sysmon_attach_minor(SYSMON_MINOR_WDOG, &sysmon_wdog_opvec); |
| 115 | |
| 116 | return error; |
| 117 | } |
| 118 | |
| 119 | int |
| 120 | sysmon_wdog_fini(void) |
| 121 | { |
| 122 | int error; |
| 123 | |
| 124 | if ( ! LIST_EMPTY(&sysmon_wdog_list)) |
| 125 | return EBUSY; |
| 126 | |
| 127 | error = sysmon_attach_minor(SYSMON_MINOR_WDOG, NULL); |
| 128 | |
| 129 | if (error == 0) { |
| 130 | callout_destroy(&sysmon_wdog_callout); |
| 131 | critpollhook_disestablish(sysmon_wdog_cphook); |
| 132 | shutdownhook_disestablish(sysmon_wdog_sdhook); |
| 133 | cv_destroy(&sysmon_wdog_cv); |
| 134 | mutex_destroy(&sysmon_wdog_mtx); |
| 135 | mutex_destroy(&sysmon_wdog_list_mtx); |
| 136 | } |
| 137 | |
| 138 | return error; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * sysmonopen_wdog: |
| 143 | * |
| 144 | * Open the system monitor device. |
| 145 | */ |
| 146 | int |
| 147 | sysmonopen_wdog(dev_t dev, int flag, int mode, struct lwp *l) |
| 148 | { |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * sysmonclose_wdog: |
| 155 | * |
| 156 | * Close the system monitor device. |
| 157 | */ |
| 158 | int |
| 159 | sysmonclose_wdog(dev_t dev, int flag, int mode, struct lwp *l) |
| 160 | { |
| 161 | struct sysmon_wdog *smw; |
| 162 | int error = 0; |
| 163 | |
| 164 | /* |
| 165 | * If this is the last close, and there is a watchdog |
| 166 | * running in UTICKLE mode, we need to disable it, |
| 167 | * otherwise the system will reset in short order. |
| 168 | * |
| 169 | * XXX Maybe we should just go into KTICKLE mode? |
| 170 | */ |
| 171 | mutex_enter(&sysmon_wdog_mtx); |
| 172 | if ((smw = sysmon_armed_wdog) != NULL) { |
| 173 | if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_UTICKLE) { |
| 174 | error = sysmon_wdog_setmode(smw, |
| 175 | WDOG_MODE_DISARMED, smw->smw_period); |
| 176 | if (error) { |
| 177 | printf("WARNING: UNABLE TO DISARM " |
| 178 | "WATCHDOG %s ON CLOSE!\n" , |
| 179 | smw->smw_name); |
| 180 | /* |
| 181 | * ...we will probably reboot soon. |
| 182 | */ |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | mutex_exit(&sysmon_wdog_mtx); |
| 187 | |
| 188 | return error; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * sysmonioctl_wdog: |
| 193 | * |
| 194 | * Perform a watchdog control request. |
| 195 | */ |
| 196 | int |
| 197 | sysmonioctl_wdog(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 198 | { |
| 199 | struct sysmon_wdog *smw; |
| 200 | int error = 0; |
| 201 | |
| 202 | switch (cmd) { |
| 203 | case WDOGIOC_GMODE: |
| 204 | { |
| 205 | struct wdog_mode *wm = (void *) data; |
| 206 | |
| 207 | wm->wm_name[sizeof(wm->wm_name) - 1] = '\0'; |
| 208 | smw = sysmon_wdog_find(wm->wm_name); |
| 209 | if (smw == NULL) { |
| 210 | error = ESRCH; |
| 211 | break; |
| 212 | } |
| 213 | |
| 214 | wm->wm_mode = smw->smw_mode; |
| 215 | wm->wm_period = smw->smw_period; |
| 216 | sysmon_wdog_release(smw); |
| 217 | break; |
| 218 | } |
| 219 | |
| 220 | case WDOGIOC_SMODE: |
| 221 | { |
| 222 | struct wdog_mode *wm = (void *) data; |
| 223 | |
| 224 | if ((flag & FWRITE) == 0) { |
| 225 | error = EPERM; |
| 226 | break; |
| 227 | } |
| 228 | |
| 229 | wm->wm_name[sizeof(wm->wm_name) - 1] = '\0'; |
| 230 | smw = sysmon_wdog_find(wm->wm_name); |
| 231 | if (smw == NULL) { |
| 232 | error = ESRCH; |
| 233 | break; |
| 234 | } |
| 235 | |
| 236 | if (wm->wm_mode & ~(WDOG_MODE_MASK|WDOG_FEATURE_MASK)) |
| 237 | error = EINVAL; |
| 238 | else { |
| 239 | mutex_enter(&sysmon_wdog_mtx); |
| 240 | error = sysmon_wdog_setmode(smw, wm->wm_mode, |
| 241 | wm->wm_period); |
| 242 | mutex_exit(&sysmon_wdog_mtx); |
| 243 | } |
| 244 | |
| 245 | sysmon_wdog_release(smw); |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | case WDOGIOC_WHICH: |
| 250 | { |
| 251 | struct wdog_mode *wm = (void *) data; |
| 252 | |
| 253 | mutex_enter(&sysmon_wdog_mtx); |
| 254 | if ((smw = sysmon_armed_wdog) != NULL) { |
| 255 | strcpy(wm->wm_name, smw->smw_name); |
| 256 | wm->wm_mode = smw->smw_mode; |
| 257 | wm->wm_period = smw->smw_period; |
| 258 | } else |
| 259 | error = ESRCH; |
| 260 | mutex_exit(&sysmon_wdog_mtx); |
| 261 | break; |
| 262 | } |
| 263 | |
| 264 | case WDOGIOC_TICKLE: |
| 265 | if ((flag & FWRITE) == 0) { |
| 266 | error = EPERM; |
| 267 | break; |
| 268 | } |
| 269 | |
| 270 | mutex_enter(&sysmon_wdog_mtx); |
| 271 | if ((smw = sysmon_armed_wdog) != NULL) { |
| 272 | error = (*smw->smw_tickle)(smw); |
| 273 | if (error == 0) |
| 274 | smw->smw_tickler = l->l_proc->p_pid; |
| 275 | } else |
| 276 | error = ESRCH; |
| 277 | mutex_exit(&sysmon_wdog_mtx); |
| 278 | break; |
| 279 | |
| 280 | case WDOGIOC_GTICKLER: |
| 281 | if ((smw = sysmon_armed_wdog) != NULL) |
| 282 | *(pid_t *)data = smw->smw_tickler; |
| 283 | else |
| 284 | error = ESRCH; |
| 285 | break; |
| 286 | |
| 287 | case WDOGIOC_GWDOGS: |
| 288 | { |
| 289 | struct wdog_conf *wc = (void *) data; |
| 290 | char *cp; |
| 291 | int i; |
| 292 | |
| 293 | mutex_enter(&sysmon_wdog_list_mtx); |
| 294 | if (wc->wc_names == NULL) |
| 295 | wc->wc_count = sysmon_wdog_count; |
| 296 | else { |
| 297 | for (i = 0, cp = wc->wc_names, |
| 298 | smw = LIST_FIRST(&sysmon_wdog_list); |
| 299 | i < sysmon_wdog_count && smw != NULL && error == 0; |
| 300 | i++, cp += WDOG_NAMESIZE, |
| 301 | smw = LIST_NEXT(smw, smw_list)) |
| 302 | error = copyout(smw->smw_name, cp, |
| 303 | strlen(smw->smw_name) + 1); |
| 304 | wc->wc_count = i; |
| 305 | } |
| 306 | mutex_exit(&sysmon_wdog_list_mtx); |
| 307 | break; |
| 308 | } |
| 309 | |
| 310 | default: |
| 311 | error = ENOTTY; |
| 312 | } |
| 313 | |
| 314 | return error; |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * sysmon_wdog_register: |
| 319 | * |
| 320 | * Register a watchdog device. |
| 321 | */ |
| 322 | int |
| 323 | sysmon_wdog_register(struct sysmon_wdog *smw) |
| 324 | { |
| 325 | struct sysmon_wdog *lsmw; |
| 326 | int error = 0; |
| 327 | |
| 328 | (void)RUN_ONCE(&once_wdog, wdog_preinit); |
| 329 | |
| 330 | mutex_enter(&sysmon_wdog_list_mtx); |
| 331 | |
| 332 | LIST_FOREACH(lsmw, &sysmon_wdog_list, smw_list) { |
| 333 | if (strcmp(lsmw->smw_name, smw->smw_name) == 0) { |
| 334 | error = EEXIST; |
| 335 | goto out; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | smw->smw_mode = WDOG_MODE_DISARMED; |
| 340 | smw->smw_tickler = (pid_t) -1; |
| 341 | smw->smw_refcnt = 0; |
| 342 | sysmon_wdog_count++; |
| 343 | LIST_INSERT_HEAD(&sysmon_wdog_list, smw, smw_list); |
| 344 | |
| 345 | out: |
| 346 | mutex_exit(&sysmon_wdog_list_mtx); |
| 347 | return error; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * sysmon_wdog_unregister: |
| 352 | * |
| 353 | * Unregister a watchdog device. |
| 354 | */ |
| 355 | int |
| 356 | sysmon_wdog_unregister(struct sysmon_wdog *smw) |
| 357 | { |
| 358 | int rc = 0; |
| 359 | |
| 360 | mutex_enter(&sysmon_wdog_list_mtx); |
| 361 | while (smw->smw_refcnt > 0 && rc == 0) { |
| 362 | aprint_debug("%s: %d users remain\n" , smw->smw_name, |
| 363 | smw->smw_refcnt); |
| 364 | rc = cv_wait_sig(&sysmon_wdog_cv, &sysmon_wdog_list_mtx); |
| 365 | } |
| 366 | if (rc == 0) { |
| 367 | sysmon_wdog_count--; |
| 368 | LIST_REMOVE(smw, smw_list); |
| 369 | } |
| 370 | mutex_exit(&sysmon_wdog_list_mtx); |
| 371 | return rc; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * sysmon_wdog_critpoll: |
| 376 | * |
| 377 | * Perform critical operations during long polling periods |
| 378 | */ |
| 379 | void |
| 380 | sysmon_wdog_critpoll(void *arg) |
| 381 | { |
| 382 | struct sysmon_wdog *smw = sysmon_armed_wdog; |
| 383 | |
| 384 | if (smw == NULL) |
| 385 | return; |
| 386 | |
| 387 | if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) { |
| 388 | if ((*smw->smw_tickle)(smw) != 0) { |
| 389 | printf("WARNING: KERNEL TICKLE OF WATCHDOG %s " |
| 390 | "FAILED!\n" , smw->smw_name); |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * sysmon_wdog_find: |
| 397 | * |
| 398 | * Find a watchdog device. We increase the reference |
| 399 | * count on a match. |
| 400 | */ |
| 401 | struct sysmon_wdog * |
| 402 | sysmon_wdog_find(const char *name) |
| 403 | { |
| 404 | struct sysmon_wdog *smw; |
| 405 | |
| 406 | mutex_enter(&sysmon_wdog_list_mtx); |
| 407 | |
| 408 | LIST_FOREACH(smw, &sysmon_wdog_list, smw_list) { |
| 409 | if (strcmp(smw->smw_name, name) == 0) |
| 410 | break; |
| 411 | } |
| 412 | |
| 413 | if (smw != NULL) |
| 414 | smw->smw_refcnt++; |
| 415 | |
| 416 | mutex_exit(&sysmon_wdog_list_mtx); |
| 417 | return smw; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * sysmon_wdog_release: |
| 422 | * |
| 423 | * Release a watchdog device. |
| 424 | */ |
| 425 | void |
| 426 | sysmon_wdog_release(struct sysmon_wdog *smw) |
| 427 | { |
| 428 | |
| 429 | mutex_enter(&sysmon_wdog_list_mtx); |
| 430 | KASSERT(smw->smw_refcnt != 0); |
| 431 | smw->smw_refcnt--; |
| 432 | cv_signal(&sysmon_wdog_cv); |
| 433 | mutex_exit(&sysmon_wdog_list_mtx); |
| 434 | } |
| 435 | |
| 436 | void |
| 437 | sysmon_wdog_ref(struct sysmon_wdog *smw) |
| 438 | { |
| 439 | mutex_enter(&sysmon_wdog_list_mtx); |
| 440 | smw->smw_refcnt++; |
| 441 | mutex_exit(&sysmon_wdog_list_mtx); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * sysmon_wdog_setmode: |
| 446 | * |
| 447 | * Set the mode of a watchdog device. |
| 448 | */ |
| 449 | int |
| 450 | sysmon_wdog_setmode(struct sysmon_wdog *smw, int mode, u_int period) |
| 451 | { |
| 452 | u_int operiod = smw->smw_period; |
| 453 | int omode = smw->smw_mode; |
| 454 | int error = 0; |
| 455 | |
| 456 | smw->smw_period = period; |
| 457 | smw->smw_mode = mode; |
| 458 | |
| 459 | switch (mode & WDOG_MODE_MASK) { |
| 460 | case WDOG_MODE_DISARMED: |
| 461 | if (smw != sysmon_armed_wdog) { |
| 462 | error = EINVAL; |
| 463 | goto out; |
| 464 | } |
| 465 | break; |
| 466 | |
| 467 | case WDOG_MODE_KTICKLE: |
| 468 | case WDOG_MODE_UTICKLE: |
| 469 | case WDOG_MODE_ETICKLE: |
| 470 | if (sysmon_armed_wdog != NULL) { |
| 471 | error = EBUSY; |
| 472 | goto out; |
| 473 | } |
| 474 | break; |
| 475 | |
| 476 | default: |
| 477 | error = EINVAL; |
| 478 | goto out; |
| 479 | } |
| 480 | |
| 481 | error = (*smw->smw_setmode)(smw); |
| 482 | |
| 483 | out: |
| 484 | if (error) { |
| 485 | smw->smw_period = operiod; |
| 486 | smw->smw_mode = omode; |
| 487 | } else { |
| 488 | if ((mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { |
| 489 | sysmon_armed_wdog = NULL; |
| 490 | smw->smw_tickler = (pid_t) -1; |
| 491 | sysmon_wdog_release(smw); |
| 492 | if ((omode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) |
| 493 | callout_stop(&sysmon_wdog_callout); |
| 494 | } else { |
| 495 | sysmon_armed_wdog = smw; |
| 496 | sysmon_wdog_ref(smw); |
| 497 | if ((mode & WDOG_MODE_MASK) == WDOG_MODE_KTICKLE) { |
| 498 | callout_reset(&sysmon_wdog_callout, |
| 499 | WDOG_PERIOD_TO_TICKS(smw->smw_period) / 2, |
| 500 | sysmon_wdog_ktickle, NULL); |
| 501 | } |
| 502 | } |
| 503 | } |
| 504 | return error; |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * sysmon_wdog_ktickle: |
| 509 | * |
| 510 | * Kernel watchdog tickle routine. |
| 511 | */ |
| 512 | void |
| 513 | sysmon_wdog_ktickle(void *arg) |
| 514 | { |
| 515 | struct sysmon_wdog *smw; |
| 516 | |
| 517 | mutex_enter(&sysmon_wdog_mtx); |
| 518 | if ((smw = sysmon_armed_wdog) != NULL) { |
| 519 | if ((*smw->smw_tickle)(smw) != 0) { |
| 520 | printf("WARNING: KERNEL TICKLE OF WATCHDOG %s " |
| 521 | "FAILED!\n" , smw->smw_name); |
| 522 | /* |
| 523 | * ...we will probably reboot soon. |
| 524 | */ |
| 525 | } |
| 526 | callout_reset(&sysmon_wdog_callout, |
| 527 | WDOG_PERIOD_TO_TICKS(smw->smw_period) / 2, |
| 528 | sysmon_wdog_ktickle, NULL); |
| 529 | } |
| 530 | mutex_exit(&sysmon_wdog_mtx); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * sysmon_wdog_shutdown: |
| 535 | * |
| 536 | * Perform shutdown-time operations. |
| 537 | */ |
| 538 | void |
| 539 | sysmon_wdog_shutdown(void *arg) |
| 540 | { |
| 541 | struct sysmon_wdog *smw; |
| 542 | |
| 543 | /* |
| 544 | * XXX Locking here? I don't think it's necessary. |
| 545 | */ |
| 546 | |
| 547 | if ((smw = sysmon_armed_wdog) != NULL) { |
| 548 | if (sysmon_wdog_setmode(smw, WDOG_MODE_DISARMED, |
| 549 | smw->smw_period)) |
| 550 | printf("WARNING: FAILED TO SHUTDOWN WATCHDOG %s!\n" , |
| 551 | smw->smw_name); |
| 552 | } |
| 553 | } |
| 554 | static |
| 555 | int |
| 556 | sysmon_wdog_modcmd(modcmd_t cmd, void *arg) |
| 557 | { |
| 558 | int ret; |
| 559 | |
| 560 | switch (cmd) { |
| 561 | case MODULE_CMD_INIT: |
| 562 | ret = sysmon_wdog_init(); |
| 563 | break; |
| 564 | |
| 565 | case MODULE_CMD_FINI: |
| 566 | ret = sysmon_wdog_fini(); |
| 567 | break; |
| 568 | |
| 569 | case MODULE_CMD_STAT: |
| 570 | default: |
| 571 | ret = ENOTTY; |
| 572 | } |
| 573 | |
| 574 | return ret; |
| 575 | } |
| 576 | |