vio9p.c revision 1.7
1 /* $NetBSD: vio9p.c,v 1.7 2022/04/13 15:08:52 uwe Exp $ */ 2 3 /* 4 * Copyright (c) 2019 Internet Initiative Japan, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: vio9p.c,v 1.7 2022/04/13 15:08:52 uwe Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/condvar.h> 37 #include <sys/device.h> 38 #include <sys/mutex.h> 39 #include <sys/sysctl.h> 40 #include <sys/module.h> 41 #include <sys/syslog.h> 42 #include <sys/select.h> 43 #include <sys/kmem.h> 44 45 #include <sys/file.h> 46 #include <sys/filedesc.h> 47 #include <sys/uio.h> 48 49 #include <dev/pci/virtioreg.h> 50 #include <dev/pci/virtiovar.h> 51 52 #include "ioconf.h" 53 54 //#define VIO9P_DEBUG 1 55 //#define VIO9P_DUMP 1 56 #ifdef VIO9P_DEBUG 57 #define DLOG(fmt, args...) \ 58 do { log(LOG_DEBUG, "%s: " fmt "\n", __func__, ##args); } while (0) 59 #else 60 #define DLOG(fmt, args...) __nothing 61 #endif 62 63 /* Device-specific feature bits */ 64 #define VIO9P_F_MOUNT_TAG (UINT64_C(1) << 0) /* mount tag specified */ 65 66 /* Configuration registers */ 67 #define VIO9P_CONFIG_TAG_LEN 0 /* 16bit */ 68 #define VIO9P_CONFIG_TAG 2 69 70 #define VIO9P_FLAG_BITS \ 71 VIRTIO_COMMON_FLAG_BITS \ 72 "b\x00" "MOUNT_TAG\0" 73 74 75 // Must be the same as P9P_DEFREQLEN of usr.sbin/puffs/mount_9p/ninepuffs.h 76 #define VIO9P_MAX_REQLEN (16 * 1024) 77 #define VIO9P_SEGSIZE PAGE_SIZE 78 #define VIO9P_N_SEGMENTS (VIO9P_MAX_REQLEN / VIO9P_SEGSIZE) 79 80 #define P9_MAX_TAG_LEN 16 81 82 CTASSERT((PAGE_SIZE) == (VIRTIO_PAGE_SIZE)); /* XXX */ 83 84 struct vio9p_softc { 85 device_t sc_dev; 86 87 struct virtio_softc *sc_virtio; 88 struct virtqueue sc_vq[1]; 89 90 uint16_t sc_taglen; 91 uint8_t sc_tag[P9_MAX_TAG_LEN + 1]; 92 93 int sc_flags; 94 #define VIO9P_INUSE __BIT(0) 95 96 int sc_state; 97 #define VIO9P_S_INIT 0 98 #define VIO9P_S_REQUESTING 1 99 #define VIO9P_S_REPLIED 2 100 #define VIO9P_S_CONSUMING 3 101 kcondvar_t sc_wait; 102 struct selinfo sc_sel; 103 kmutex_t sc_lock; 104 105 bus_dmamap_t sc_dmamap_tx; 106 bus_dmamap_t sc_dmamap_rx; 107 char *sc_buf_tx; 108 char *sc_buf_rx; 109 size_t sc_buf_rx_len; 110 off_t sc_buf_rx_offset; 111 }; 112 113 /* 114 * Locking notes: 115 * - sc_state, sc_wait and sc_sel are protected by sc_lock 116 * 117 * The state machine (sc_state): 118 * - INIT =(write from client)=> REQUESTING 119 * - REQUESTING =(reply from host)=> REPLIED 120 * - REPLIED =(read from client)=> CONSUMING 121 * - CONSUMING =(read completed(*))=> INIT 122 * 123 * (*) read may not finish by one read(2) request, then 124 * the state remains CONSUMING. 125 */ 126 127 static int vio9p_match(device_t, cfdata_t, void *); 128 static void vio9p_attach(device_t, device_t, void *); 129 static void vio9p_read_config(struct vio9p_softc *); 130 static int vio9p_request_done(struct virtqueue *); 131 132 static int vio9p_read(struct file *, off_t *, struct uio *, kauth_cred_t, 133 int); 134 static int vio9p_write(struct file *, off_t *, struct uio *, 135 kauth_cred_t, int); 136 static int vio9p_ioctl(struct file *, u_long, void *); 137 static int vio9p_close(struct file *); 138 static int vio9p_kqfilter(struct file *, struct knote *); 139 140 static const struct fileops vio9p_fileops = { 141 .fo_name = "vio9p", 142 .fo_read = vio9p_read, 143 .fo_write = vio9p_write, 144 .fo_ioctl = vio9p_ioctl, 145 .fo_fcntl = fnullop_fcntl, 146 .fo_poll = fnullop_poll, 147 .fo_stat = fbadop_stat, 148 .fo_close = vio9p_close, 149 .fo_kqfilter = vio9p_kqfilter, 150 .fo_restart = fnullop_restart, 151 }; 152 153 static dev_type_open(vio9p_dev_open); 154 155 const struct cdevsw vio9p_cdevsw = { 156 .d_open = vio9p_dev_open, 157 .d_read = noread, 158 .d_write = nowrite, 159 .d_ioctl = noioctl, 160 .d_stop = nostop, 161 .d_tty = notty, 162 .d_poll = nopoll, 163 .d_mmap = nommap, 164 .d_kqfilter = nokqfilter, 165 .d_discard = nodiscard, 166 .d_flag = D_OTHER | D_MPSAFE, 167 }; 168 169 static int 170 vio9p_dev_open(dev_t dev, int flag, int mode, struct lwp *l) 171 { 172 struct vio9p_softc *sc; 173 struct file *fp; 174 int error, fd; 175 176 sc = device_lookup_private(&vio9p_cd, minor(dev)); 177 if (sc == NULL) 178 return ENXIO; 179 180 /* FIXME TOCTOU */ 181 if (ISSET(sc->sc_flags, VIO9P_INUSE)) 182 return EBUSY; 183 184 /* falloc() will fill in the descriptor for us. */ 185 error = fd_allocfile(&fp, &fd); 186 if (error != 0) 187 return error; 188 189 sc->sc_flags |= VIO9P_INUSE; 190 191 return fd_clone(fp, fd, flag, &vio9p_fileops, sc); 192 } 193 194 static int 195 vio9p_ioctl(struct file *fp, u_long cmd, void *addr) 196 { 197 int error = 0; 198 199 switch (cmd) { 200 case FIONBIO: 201 break; 202 default: 203 error = EINVAL; 204 break; 205 } 206 207 return error; 208 } 209 210 static int 211 vio9p_read(struct file *fp, off_t *offp, struct uio *uio, 212 kauth_cred_t cred, int flags) 213 { 214 struct vio9p_softc *sc = fp->f_data; 215 struct virtio_softc *vsc = sc->sc_virtio; 216 struct virtqueue *vq = &sc->sc_vq[0]; 217 int error, slot, len; 218 219 DLOG("enter"); 220 221 mutex_enter(&sc->sc_lock); 222 223 if (sc->sc_state == VIO9P_S_INIT) { 224 DLOG("%s: not requested", device_xname(sc->sc_dev)); 225 error = EAGAIN; 226 goto out; 227 } 228 229 if (sc->sc_state == VIO9P_S_CONSUMING) { 230 KASSERT(sc->sc_buf_rx_len > 0); 231 /* We already have some remaining, consume it. */ 232 len = sc->sc_buf_rx_len - sc->sc_buf_rx_offset; 233 goto consume; 234 } 235 236 #if 0 237 if (uio->uio_resid != VIO9P_MAX_REQLEN) 238 return EINVAL; 239 #else 240 if (uio->uio_resid > VIO9P_MAX_REQLEN) { 241 error = EINVAL; 242 goto out; 243 } 244 #endif 245 246 error = 0; 247 while (sc->sc_state == VIO9P_S_REQUESTING) { 248 error = cv_timedwait_sig(&sc->sc_wait, &sc->sc_lock, hz); 249 if (error != 0) 250 break; 251 } 252 if (sc->sc_state == VIO9P_S_REPLIED) 253 sc->sc_state = VIO9P_S_CONSUMING; 254 255 if (error != 0) 256 goto out; 257 258 error = virtio_dequeue(vsc, vq, &slot, &len); 259 if (error != 0) { 260 log(LOG_ERR, "%s: virtio_dequeue failed: %d\n", 261 device_xname(sc->sc_dev), error); 262 goto out; 263 } 264 DLOG("len=%d", len); 265 sc->sc_buf_rx_len = len; 266 sc->sc_buf_rx_offset = 0; 267 bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_tx, 0, VIO9P_MAX_REQLEN, 268 BUS_DMASYNC_POSTWRITE); 269 bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_rx, 0, VIO9P_MAX_REQLEN, 270 BUS_DMASYNC_POSTREAD); 271 virtio_dequeue_commit(vsc, vq, slot); 272 #ifdef VIO9P_DUMP 273 int i; 274 log(LOG_DEBUG, "%s: buf: ", __func__); 275 for (i = 0; i < len; i++) { 276 log(LOG_DEBUG, "%c", (char)sc->sc_buf_rx[i]); 277 } 278 log(LOG_DEBUG, "\n"); 279 #endif 280 281 consume: 282 DLOG("uio_resid=%lu", uio->uio_resid); 283 if (len < uio->uio_resid) { 284 error = EINVAL; 285 goto out; 286 } 287 len = uio->uio_resid; 288 error = uiomove(sc->sc_buf_rx + sc->sc_buf_rx_offset, len, uio); 289 if (error != 0) 290 goto out; 291 292 sc->sc_buf_rx_offset += len; 293 if (sc->sc_buf_rx_offset == sc->sc_buf_rx_len) { 294 sc->sc_buf_rx_len = 0; 295 sc->sc_buf_rx_offset = 0; 296 297 sc->sc_state = VIO9P_S_INIT; 298 selnotify(&sc->sc_sel, 0, 1); 299 } 300 301 out: 302 mutex_exit(&sc->sc_lock); 303 return error; 304 } 305 306 static int 307 vio9p_write(struct file *fp, off_t *offp, struct uio *uio, 308 kauth_cred_t cred, int flags) 309 { 310 struct vio9p_softc *sc = fp->f_data; 311 struct virtio_softc *vsc = sc->sc_virtio; 312 struct virtqueue *vq = &sc->sc_vq[0]; 313 int error, slot; 314 size_t len; 315 316 DLOG("enter"); 317 318 mutex_enter(&sc->sc_lock); 319 320 if (sc->sc_state != VIO9P_S_INIT) { 321 DLOG("already requesting"); 322 error = EAGAIN; 323 goto out; 324 } 325 326 if (uio->uio_resid == 0) { 327 error = 0; 328 goto out; 329 } 330 331 if (uio->uio_resid > VIO9P_MAX_REQLEN) { 332 error = EINVAL; 333 goto out; 334 } 335 336 len = uio->uio_resid; 337 error = uiomove(sc->sc_buf_tx, len, uio); 338 if (error != 0) 339 goto out; 340 341 DLOG("len=%lu", len); 342 #ifdef VIO9P_DUMP 343 int i; 344 log(LOG_DEBUG, "%s: buf: ", __func__); 345 for (i = 0; i < len; i++) { 346 log(LOG_DEBUG, "%c", (char)sc->sc_buf_tx[i]); 347 } 348 log(LOG_DEBUG, "\n"); 349 #endif 350 351 error = virtio_enqueue_prep(vsc, vq, &slot); 352 if (error != 0) { 353 log(LOG_ERR, "%s: virtio_enqueue_prep failed\n", 354 device_xname(sc->sc_dev)); 355 goto out; 356 } 357 DLOG("slot=%d", slot); 358 error = virtio_enqueue_reserve(vsc, vq, slot, 359 sc->sc_dmamap_tx->dm_nsegs + sc->sc_dmamap_rx->dm_nsegs); 360 if (error != 0) { 361 log(LOG_ERR, "%s: virtio_enqueue_reserve failed\n", 362 device_xname(sc->sc_dev)); 363 goto out; 364 } 365 366 /* Tx */ 367 bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_tx, 0, 368 len, BUS_DMASYNC_PREWRITE); 369 virtio_enqueue(vsc, vq, slot, sc->sc_dmamap_tx, true); 370 /* Rx */ 371 bus_dmamap_sync(virtio_dmat(vsc), sc->sc_dmamap_rx, 0, 372 VIO9P_MAX_REQLEN, BUS_DMASYNC_PREREAD); 373 virtio_enqueue(vsc, vq, slot, sc->sc_dmamap_rx, false); 374 virtio_enqueue_commit(vsc, vq, slot, true); 375 376 sc->sc_state = VIO9P_S_REQUESTING; 377 out: 378 mutex_exit(&sc->sc_lock); 379 return error; 380 } 381 382 static int 383 vio9p_close(struct file *fp) 384 { 385 struct vio9p_softc *sc = fp->f_data; 386 387 KASSERT(ISSET(sc->sc_flags, VIO9P_INUSE)); 388 sc->sc_flags &= ~VIO9P_INUSE; 389 390 return 0; 391 } 392 393 static void 394 filt_vio9p_detach(struct knote *kn) 395 { 396 struct vio9p_softc *sc = kn->kn_hook; 397 398 mutex_enter(&sc->sc_lock); 399 selremove_knote(&sc->sc_sel, kn); 400 mutex_exit(&sc->sc_lock); 401 } 402 403 static int 404 filt_vio9p_read(struct knote *kn, long hint) 405 { 406 struct vio9p_softc *sc = kn->kn_hook; 407 int rv; 408 409 kn->kn_data = sc->sc_buf_rx_len; 410 /* XXX need sc_lock? */ 411 rv = (kn->kn_data > 0) || sc->sc_state != VIO9P_S_INIT; 412 413 return rv; 414 } 415 416 static const struct filterops vio9p_read_filtops = { 417 .f_flags = FILTEROP_ISFD, 418 .f_attach = NULL, 419 .f_detach = filt_vio9p_detach, 420 .f_event = filt_vio9p_read, 421 }; 422 423 static int 424 filt_vio9p_write(struct knote *kn, long hint) 425 { 426 struct vio9p_softc *sc = kn->kn_hook; 427 428 /* XXX need sc_lock? */ 429 return sc->sc_state == VIO9P_S_INIT; 430 } 431 432 static const struct filterops vio9p_write_filtops = { 433 .f_flags = FILTEROP_ISFD, 434 .f_attach = NULL, 435 .f_detach = filt_vio9p_detach, 436 .f_event = filt_vio9p_write, 437 }; 438 439 static int 440 vio9p_kqfilter(struct file *fp, struct knote *kn) 441 { 442 struct vio9p_softc *sc = fp->f_data; 443 444 switch (kn->kn_filter) { 445 case EVFILT_READ: 446 kn->kn_fop = &vio9p_read_filtops; 447 break; 448 449 case EVFILT_WRITE: 450 kn->kn_fop = &vio9p_write_filtops; 451 break; 452 453 default: 454 log(LOG_ERR, "%s: kn_filter=%u\n", __func__, kn->kn_filter); 455 return EINVAL; 456 } 457 458 kn->kn_hook = sc; 459 460 mutex_enter(&sc->sc_lock); 461 selrecord_knote(&sc->sc_sel, kn); 462 mutex_exit(&sc->sc_lock); 463 464 return 0; 465 } 466 467 CFATTACH_DECL_NEW(vio9p, sizeof(struct vio9p_softc), 468 vio9p_match, vio9p_attach, NULL, NULL); 469 470 static int 471 vio9p_match(device_t parent, cfdata_t match, void *aux) 472 { 473 struct virtio_attach_args *va = aux; 474 475 if (va->sc_childdevid == VIRTIO_DEVICE_ID_9P) 476 return 1; 477 478 return 0; 479 } 480 481 static void 482 vio9p_attach(device_t parent, device_t self, void *aux) 483 { 484 struct vio9p_softc *sc = device_private(self); 485 struct virtio_softc *vsc = device_private(parent); 486 uint64_t features; 487 int error; 488 489 if (virtio_child(vsc) != NULL) { 490 aprint_normal(": child already attached for %s; " 491 "something wrong...\n", device_xname(parent)); 492 return; 493 } 494 495 sc->sc_dev = self; 496 sc->sc_virtio = vsc; 497 498 virtio_child_attach_start(vsc, self, IPL_VM, NULL, 499 NULL, virtio_vq_intr, 500 VIRTIO_F_INTR_MPSAFE | VIRTIO_F_INTR_SOFTINT, 501 VIO9P_F_MOUNT_TAG, 502 VIO9P_FLAG_BITS); 503 504 features = virtio_features(vsc); 505 if ((features & VIO9P_F_MOUNT_TAG) == 0) 506 goto err_none; 507 508 error = virtio_alloc_vq(vsc, &sc->sc_vq[0], 0, VIO9P_MAX_REQLEN, 509 VIO9P_N_SEGMENTS * 2, "vio9p"); 510 if (error != 0) 511 goto err_none; 512 513 sc->sc_vq[0].vq_done = vio9p_request_done; 514 515 virtio_child_attach_set_vqs(vsc, sc->sc_vq, 1); 516 517 sc->sc_buf_tx = kmem_alloc(VIO9P_MAX_REQLEN, KM_SLEEP); 518 sc->sc_buf_rx = kmem_alloc(VIO9P_MAX_REQLEN, KM_SLEEP); 519 520 error = bus_dmamap_create(virtio_dmat(vsc), VIO9P_MAX_REQLEN, 521 VIO9P_N_SEGMENTS, VIO9P_SEGSIZE, 0, BUS_DMA_WAITOK, &sc->sc_dmamap_tx); 522 if (error != 0) { 523 aprint_error_dev(sc->sc_dev, "bus_dmamap_create failed: %d\n", 524 error); 525 goto err_vq; 526 } 527 error = bus_dmamap_create(virtio_dmat(vsc), VIO9P_MAX_REQLEN, 528 VIO9P_N_SEGMENTS, VIO9P_SEGSIZE, 0, BUS_DMA_WAITOK, &sc->sc_dmamap_rx); 529 if (error != 0) { 530 aprint_error_dev(sc->sc_dev, "bus_dmamap_create failed: %d\n", 531 error); 532 goto err_vq; 533 } 534 535 error = bus_dmamap_load(virtio_dmat(vsc), sc->sc_dmamap_tx, 536 sc->sc_buf_tx, VIO9P_MAX_REQLEN, NULL, BUS_DMA_WAITOK | BUS_DMA_WRITE); 537 if (error != 0) { 538 aprint_error_dev(sc->sc_dev, "bus_dmamap_load failed: %d\n", 539 error); 540 goto err_dmamap; 541 } 542 error = bus_dmamap_load(virtio_dmat(vsc), sc->sc_dmamap_rx, 543 sc->sc_buf_rx, VIO9P_MAX_REQLEN, NULL, BUS_DMA_WAITOK | BUS_DMA_READ); 544 if (error != 0) { 545 aprint_error_dev(sc->sc_dev, "bus_dmamap_load failed: %d\n", 546 error); 547 goto err_dmamap; 548 } 549 550 sc->sc_state = VIO9P_S_INIT; 551 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 552 cv_init(&sc->sc_wait, "vio9p"); 553 554 vio9p_read_config(sc); 555 aprint_normal_dev(self, "tagged as %s\n", sc->sc_tag); 556 557 error = virtio_child_attach_finish(vsc); 558 if (error != 0) 559 goto err_mutex; 560 561 return; 562 563 err_mutex: 564 cv_destroy(&sc->sc_wait); 565 mutex_destroy(&sc->sc_lock); 566 err_dmamap: 567 bus_dmamap_destroy(virtio_dmat(vsc), sc->sc_dmamap_tx); 568 bus_dmamap_destroy(virtio_dmat(vsc), sc->sc_dmamap_rx); 569 err_vq: 570 virtio_free_vq(vsc, &sc->sc_vq[0]); 571 err_none: 572 virtio_child_attach_failed(vsc); 573 return; 574 } 575 576 static void 577 vio9p_read_config(struct vio9p_softc *sc) 578 { 579 device_t dev = sc->sc_dev; 580 uint8_t reg; 581 int i; 582 583 /* these values are explicitly specified as little-endian */ 584 sc->sc_taglen = virtio_read_device_config_le_2(sc->sc_virtio, 585 VIO9P_CONFIG_TAG_LEN); 586 587 if (sc->sc_taglen > P9_MAX_TAG_LEN) { 588 aprint_error_dev(dev, "warning: tag is trimmed from %u to %u\n", 589 sc->sc_taglen, P9_MAX_TAG_LEN); 590 sc->sc_taglen = P9_MAX_TAG_LEN; 591 } 592 593 for (i = 0; i < sc->sc_taglen; i++) { 594 reg = virtio_read_device_config_1(sc->sc_virtio, 595 VIO9P_CONFIG_TAG + i); 596 sc->sc_tag[i] = reg; 597 } 598 sc->sc_tag[i] = '\0'; 599 } 600 601 static int 602 vio9p_request_done(struct virtqueue *vq) 603 { 604 struct virtio_softc *vsc = vq->vq_owner; 605 struct vio9p_softc *sc = device_private(virtio_child(vsc)); 606 607 DLOG("enter"); 608 609 mutex_enter(&sc->sc_lock); 610 sc->sc_state = VIO9P_S_REPLIED; 611 cv_broadcast(&sc->sc_wait); 612 selnotify(&sc->sc_sel, 0, 1); 613 mutex_exit(&sc->sc_lock); 614 615 return 1; 616 } 617 618 MODULE(MODULE_CLASS_DRIVER, vio9p, "virtio"); 619 620 #ifdef _MODULE 621 #include "ioconf.c" 622 #endif 623 624 static int 625 vio9p_modcmd(modcmd_t cmd, void *opaque) 626 { 627 #ifdef _MODULE 628 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 629 #endif 630 int error = 0; 631 632 #ifdef _MODULE 633 switch (cmd) { 634 case MODULE_CMD_INIT: 635 devsw_attach(vio9p_cd.cd_name, NULL, &bmajor, 636 &vio9p_cdevsw, &cmajor); 637 error = config_init_component(cfdriver_ioconf_vio9p, 638 cfattach_ioconf_vio9p, cfdata_ioconf_vio9p); 639 break; 640 case MODULE_CMD_FINI: 641 error = config_fini_component(cfdriver_ioconf_vio9p, 642 cfattach_ioconf_vio9p, cfdata_ioconf_vio9p); 643 devsw_detach(NULL, &vio9p_cdevsw); 644 break; 645 default: 646 error = ENOTTY; 647 break; 648 } 649 #endif 650 651 return error; 652 } 653
Indexes created Mon Sep 29 21:09:56 GMT 2025