framebuf.c revision 1.20
1 /* $NetBSD: framebuf.c,v 1.20 2007/08/25 09:30:41 pooka Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Antti Kantee. All Rights Reserved. 5 * 6 * Development of this software was supported by the 7 * Finnish Cultural Foundation. 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 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 19 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * The event portion of this code is a twisty maze of pointers, 33 * flags, yields and continues. Sincere aplogies. 34 */ 35 36 #include <sys/cdefs.h> 37 #if !defined(lint) 38 __RCSID("$NetBSD: framebuf.c,v 1.20 2007/08/25 09:30:41 pooka Exp $"); 39 #endif /* !lint */ 40 41 #include <sys/types.h> 42 #include <sys/queue.h> 43 44 #include <assert.h> 45 #include <errno.h> 46 #include <poll.h> 47 #include <puffs.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 51 #include "puffs_priv.h" 52 53 struct puffs_framebuf { 54 struct puffs_cc *pcc; /* pcc to continue with */ 55 /* OR */ 56 puffs_framev_cb fcb; /* non-blocking callback */ 57 void *fcb_arg; /* argument for previous */ 58 59 uint8_t *buf; /* buffer base */ 60 size_t len; /* total length */ 61 62 size_t offset; /* cursor, telloff() */ 63 size_t maxoff; /* maximum offset for data, tellsize() */ 64 65 volatile int rv; /* errno value */ 66 67 int istat; 68 69 TAILQ_ENTRY(puffs_framebuf) pfb_entries; 70 }; 71 #define ISTAT_NODESTROY 0x01 /* indestructible by framebuf_destroy() */ 72 #define ISTAT_INTERNAL 0x02 /* never leaves library */ 73 #define ISTAT_NOREPLY 0x04 /* nuke after sending */ 74 #define ISTAT_DIRECT 0x08 /* receive directly, no moveinfo */ 75 76 #define ISTAT_ONQUEUE ISTAT_NODESTROY /* alias */ 77 78 #define PUFBUF_INCRALLOC 4096 79 #define PUFBUF_REMAIN(p) (p->len - p->offset) 80 81 /* for poll/kqueue */ 82 struct puffs_fbevent { 83 struct puffs_cc *pcc; 84 int what; 85 volatile int rv; 86 87 LIST_ENTRY(puffs_fbevent) pfe_entries; 88 }; 89 90 static struct puffs_fctrl_io * 91 getfiobyfd(struct puffs_usermount *pu, int fd) 92 { 93 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 94 struct puffs_fctrl_io *fio; 95 96 LIST_FOREACH(fio, &pfctrl->fb_ios, fio_entries) 97 if (fio->io_fd == fd) 98 return fio; 99 return NULL; 100 } 101 102 struct puffs_framebuf * 103 puffs_framebuf_make() 104 { 105 struct puffs_framebuf *pufbuf; 106 107 pufbuf = malloc(sizeof(struct puffs_framebuf)); 108 if (pufbuf == NULL) 109 return NULL; 110 memset(pufbuf, 0, sizeof(struct puffs_framebuf)); 111 112 pufbuf->buf = malloc(PUFBUF_INCRALLOC); 113 if (pufbuf->buf == NULL) { 114 free(pufbuf); 115 return NULL; 116 } 117 pufbuf->len = PUFBUF_INCRALLOC; 118 119 puffs_framebuf_recycle(pufbuf); 120 return pufbuf; 121 } 122 123 void 124 puffs_framebuf_destroy(struct puffs_framebuf *pufbuf) 125 { 126 127 assert((pufbuf->istat & ISTAT_NODESTROY) == 0); 128 129 free(pufbuf->buf); 130 free(pufbuf); 131 } 132 133 void 134 puffs_framebuf_recycle(struct puffs_framebuf *pufbuf) 135 { 136 137 assert((pufbuf->istat & ISTAT_NODESTROY) == 0); 138 139 pufbuf->offset = 0; 140 pufbuf->maxoff = 0; 141 pufbuf->istat = 0; 142 } 143 144 static int 145 reservespace(struct puffs_framebuf *pufbuf, size_t off, size_t wantsize) 146 { 147 size_t incr; 148 void *nd; 149 150 if (off <= pufbuf->len && pufbuf->len - off >= wantsize) 151 return 0; 152 153 for (incr = PUFBUF_INCRALLOC; 154 pufbuf->len + incr < off + wantsize; 155 incr += PUFBUF_INCRALLOC) 156 continue; 157 158 nd = realloc(pufbuf->buf, pufbuf->offset + incr); 159 if (nd == NULL) 160 return -1; 161 162 pufbuf->buf = nd; 163 pufbuf->len += incr; 164 165 return 0; 166 } 167 168 int 169 puffs_framebuf_reserve_space(struct puffs_framebuf *pufbuf, size_t wantsize) 170 { 171 172 return reservespace(pufbuf, pufbuf->offset, wantsize); 173 } 174 175 int 176 puffs_framebuf_putdata(struct puffs_framebuf *pufbuf, 177 const void *data, size_t dlen) 178 { 179 180 if (PUFBUF_REMAIN(pufbuf) < dlen) 181 if (puffs_framebuf_reserve_space(pufbuf, dlen) == -1) 182 return -1; 183 184 memcpy(pufbuf->buf + pufbuf->offset, data, dlen); 185 pufbuf->offset += dlen; 186 187 if (pufbuf->offset > pufbuf->maxoff) 188 pufbuf->maxoff = pufbuf->offset; 189 190 return 0; 191 } 192 193 int 194 puffs_framebuf_putdata_atoff(struct puffs_framebuf *pufbuf, size_t offset, 195 const void *data, size_t dlen) 196 { 197 198 if (reservespace(pufbuf, offset, dlen) == -1) 199 return -1; 200 201 memcpy(pufbuf->buf + offset, data, dlen); 202 203 if (offset + dlen > pufbuf->maxoff) 204 pufbuf->maxoff = offset + dlen; 205 206 return 0; 207 } 208 209 int 210 puffs_framebuf_getdata(struct puffs_framebuf *pufbuf, void *data, size_t dlen) 211 { 212 213 if (pufbuf->maxoff < pufbuf->offset + dlen) { 214 errno = ENOBUFS; 215 return -1; 216 } 217 218 memcpy(data, pufbuf->buf + pufbuf->offset, dlen); 219 pufbuf->offset += dlen; 220 221 return 0; 222 } 223 224 int 225 puffs_framebuf_getdata_atoff(struct puffs_framebuf *pufbuf, size_t offset, 226 void *data, size_t dlen) 227 { 228 229 if (pufbuf->maxoff < offset + dlen) { 230 errno = ENOBUFS; 231 return -1; 232 } 233 234 memcpy(data, pufbuf->buf + offset, dlen); 235 return 0; 236 } 237 238 size_t 239 puffs_framebuf_telloff(struct puffs_framebuf *pufbuf) 240 { 241 242 return pufbuf->offset; 243 } 244 245 size_t 246 puffs_framebuf_tellsize(struct puffs_framebuf *pufbuf) 247 { 248 249 return pufbuf->maxoff; 250 } 251 252 size_t 253 puffs_framebuf_remaining(struct puffs_framebuf *pufbuf) 254 { 255 256 return puffs_framebuf_tellsize(pufbuf) - puffs_framebuf_telloff(pufbuf); 257 } 258 259 int 260 puffs_framebuf_seekset(struct puffs_framebuf *pufbuf, size_t newoff) 261 { 262 263 if (reservespace(pufbuf, newoff, 0) == -1) 264 return -1; 265 266 pufbuf->offset = newoff; 267 return 0; 268 } 269 270 int 271 puffs_framebuf_getwindow(struct puffs_framebuf *pufbuf, size_t winoff, 272 void **data, size_t *dlen) 273 { 274 size_t winlen; 275 276 #ifdef WINTESTING 277 winlen = MIN(*dlen, 32); 278 #else 279 winlen = *dlen; 280 #endif 281 282 if (reservespace(pufbuf, winoff, winlen) == -1) 283 return -1; 284 285 *data = pufbuf->buf + winoff; 286 if (pufbuf->maxoff < winoff + winlen) 287 pufbuf->maxoff = winoff + winlen; 288 289 return 0; 290 } 291 292 static void 293 errnotify(struct puffs_usermount *pu, struct puffs_framebuf *pufbuf, int error) 294 { 295 296 pufbuf->rv = error; 297 if (pufbuf->pcc) { 298 puffs_goto(pufbuf->pcc); 299 } else if (pufbuf->fcb) { 300 pufbuf->istat &= ~ISTAT_NODESTROY; 301 pufbuf->fcb(pu, pufbuf, pufbuf->fcb_arg, error); 302 } else { 303 pufbuf->istat &= ~ISTAT_NODESTROY; 304 puffs_framebuf_destroy(pufbuf); 305 } 306 } 307 308 #define GETFIO(fd) \ 309 do { \ 310 fio = getfiobyfd(pu, fd); \ 311 if (fio == NULL) { \ 312 errno = EINVAL; \ 313 return -1; \ 314 } \ 315 if (fio->stat & FIO_WRGONE) { \ 316 errno = ESHUTDOWN; \ 317 return -1; \ 318 } \ 319 } while (/*CONSTCOND*/0) 320 321 int 322 puffs_framev_enqueue_cc(struct puffs_cc *pcc, int fd, 323 struct puffs_framebuf *pufbuf, int flags) 324 { 325 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 326 struct puffs_fctrl_io *fio; 327 328 /* 329 * Technically we shouldn't allow this is RDGONE, but it's 330 * difficult to trap write close without allowing writes. 331 * And besides, there's probably a disconnect sequence in 332 * the protocol, so unexpectedly getting a closed fd is 333 * most likely an error condition. 334 */ 335 GETFIO(fd); 336 337 pufbuf->pcc = pcc; 338 pufbuf->fcb = NULL; 339 pufbuf->fcb_arg = NULL; 340 341 pufbuf->offset = 0; 342 pufbuf->istat |= ISTAT_NODESTROY; 343 344 if (flags & PUFFS_FBQUEUE_URGENT) 345 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 346 else 347 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 348 349 puffs_cc_yield(pcc); 350 if (pufbuf->rv) { 351 pufbuf->istat &= ~ISTAT_NODESTROY; 352 errno = pufbuf->rv; 353 return -1; 354 } 355 356 return 0; 357 } 358 359 int 360 puffs_framev_enqueue_cb(struct puffs_usermount *pu, int fd, 361 struct puffs_framebuf *pufbuf, puffs_framev_cb fcb, void *arg, 362 int flags) 363 { 364 struct puffs_fctrl_io *fio; 365 366 /* see enqueue_cc */ 367 GETFIO(fd); 368 369 pufbuf->pcc = NULL; 370 pufbuf->fcb = fcb; 371 pufbuf->fcb_arg = arg; 372 373 pufbuf->offset = 0; 374 pufbuf->istat |= ISTAT_NODESTROY; 375 376 if (flags & PUFFS_FBQUEUE_URGENT) 377 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 378 else 379 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 380 381 return 0; 382 } 383 384 int 385 puffs_framev_enqueue_justsend(struct puffs_usermount *pu, int fd, 386 struct puffs_framebuf *pufbuf, int reply, int flags) 387 { 388 struct puffs_fctrl_io *fio; 389 390 GETFIO(fd); 391 392 pufbuf->pcc = NULL; 393 pufbuf->fcb = NULL; 394 pufbuf->fcb_arg = NULL; 395 396 pufbuf->offset = 0; 397 pufbuf->istat |= ISTAT_NODESTROY; 398 if (!reply) 399 pufbuf->istat |= ISTAT_NOREPLY; 400 401 if (flags & PUFFS_FBQUEUE_URGENT) 402 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 403 else 404 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 405 406 return 0; 407 } 408 409 /* ARGSUSED */ 410 int 411 puffs_framev_enqueue_directreceive(struct puffs_cc *pcc, int fd, 412 struct puffs_framebuf *pufbuf, int flags /* used in the future */) 413 { 414 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 415 struct puffs_fctrl_io *fio; 416 417 fio = getfiobyfd(pu, fd); 418 if (fio == NULL) { 419 errno = EINVAL; 420 return -1; 421 } 422 423 /* XXX: should have cur_in queue */ 424 assert(fio->cur_in == NULL); 425 fio->cur_in = pufbuf; 426 427 pufbuf->pcc = pcc; 428 pufbuf->fcb = NULL; 429 pufbuf->fcb_arg = NULL; 430 431 pufbuf->offset = 0; 432 pufbuf->istat |= ISTAT_NODESTROY | ISTAT_DIRECT; 433 434 puffs_cc_yield(pcc); 435 pufbuf->istat &= ~ISTAT_NODESTROY; /* XXX: not the right place */ 436 if (pufbuf->rv) { 437 errno = pufbuf->rv; 438 return -1; 439 } 440 441 return 0; 442 } 443 444 int 445 puffs_framev_enqueue_directsend(struct puffs_cc *pcc, int fd, 446 struct puffs_framebuf *pufbuf, int flags) 447 { 448 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 449 struct puffs_fctrl_io *fio; 450 451 if (flags & PUFFS_FBQUEUE_URGENT) 452 abort(); /* EOPNOTSUPP for now */ 453 454 GETFIO(fd); 455 456 pufbuf->pcc = pcc; 457 pufbuf->fcb = NULL; 458 pufbuf->fcb_arg = NULL; 459 460 pufbuf->offset = 0; 461 pufbuf->istat |= ISTAT_NODESTROY | ISTAT_DIRECT; 462 463 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 464 465 puffs_cc_yield(pcc); 466 if (pufbuf->rv) { 467 pufbuf->istat &= ~ISTAT_NODESTROY; 468 errno = pufbuf->rv; 469 return -1; 470 } 471 472 return 0; 473 } 474 475 /* 476 * this beauty shall remain undocumented for now 477 */ 478 int 479 puffs_framev_framebuf_ccpromote(struct puffs_framebuf *pufbuf, 480 struct puffs_cc *pcc) 481 { 482 483 if ((pufbuf->istat & ISTAT_ONQUEUE) == 0) { 484 errno = EBUSY; 485 return -1; 486 } 487 488 pufbuf->pcc = pcc; 489 pufbuf->fcb = NULL; 490 pufbuf->fcb_arg = NULL; 491 pufbuf->istat &= ~ISTAT_NOREPLY; 492 493 puffs_cc_yield(pcc); 494 495 return 0; 496 } 497 498 int 499 puffs_framev_enqueue_waitevent(struct puffs_cc *pcc, int fd, int *what) 500 { 501 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 502 struct puffs_fctrl_io *fio; 503 struct puffs_fbevent feb; 504 struct kevent kev; 505 int rv, svwhat; 506 507 svwhat = *what; 508 509 if (*what == 0) { 510 errno = EINVAL; 511 return -1; 512 } 513 514 fio = getfiobyfd(pu, fd); 515 if (fio == NULL) { 516 errno = EINVAL; 517 return -1; 518 } 519 520 feb.pcc = pcc; 521 feb.what = *what & (PUFFS_FBIO_READ|PUFFS_FBIO_WRITE|PUFFS_FBIO_ERROR); 522 523 if (*what & PUFFS_FBIO_READ) 524 if ((fio->stat & FIO_ENABLE_R) == 0) 525 EV_SET(&kev, fd, EVFILT_READ, EV_ENABLE, 526 0, 0, (uintptr_t)fio); 527 528 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 529 if (rv != 0) 530 return errno; 531 532 if (*what & PUFFS_FBIO_READ) 533 fio->rwait++; 534 if (*what & PUFFS_FBIO_WRITE) 535 fio->wwait++; 536 537 LIST_INSERT_HEAD(&fio->ev_qing, &feb, pfe_entries); 538 puffs_cc_yield(pcc); 539 540 assert(svwhat == *what); 541 542 if (*what & PUFFS_FBIO_READ) { 543 fio->rwait--; 544 if (fio->rwait == 0 && (fio->stat & FIO_ENABLE_R) == 0) { 545 EV_SET(&kev, fd, EVFILT_READ, EV_DISABLE, 546 0, 0, (uintptr_t)fio); 547 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 548 #if 0 549 if (rv != 0) 550 /* XXXXX oh dear */; 551 #endif 552 } 553 } 554 if (*what & PUFFS_FBIO_WRITE) 555 fio->wwait--; 556 557 if (feb.rv == 0) { 558 *what = feb.what; 559 rv = 0; 560 } else { 561 *what = PUFFS_FBIO_ERROR; 562 errno = feb.rv; 563 rv = -1; 564 } 565 566 return rv; 567 } 568 569 void 570 puffs_framev_notify(struct puffs_fctrl_io *fio, int what) 571 { 572 struct puffs_fbevent *fbevp; 573 574 restart: 575 LIST_FOREACH(fbevp, &fio->ev_qing, pfe_entries) { 576 if (fbevp->what & what) { 577 fbevp->what = what; 578 fbevp->rv = 0; 579 LIST_REMOVE(fbevp, pfe_entries); 580 puffs_cc_continue(fbevp->pcc); 581 goto restart; 582 } 583 } 584 } 585 586 static struct puffs_framebuf * 587 findbuf(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 588 struct puffs_fctrl_io *fio, struct puffs_framebuf *findme) 589 { 590 struct puffs_framebuf *cand; 591 592 TAILQ_FOREACH(cand, &fio->res_qing, pfb_entries) 593 if (fctrl->cmpfb(pu, findme, cand) == 0) 594 break; 595 596 if (cand == NULL) 597 return NULL; 598 599 TAILQ_REMOVE(&fio->res_qing, cand, pfb_entries); 600 return cand; 601 } 602 603 static void 604 moveinfo(struct puffs_framebuf *from, struct puffs_framebuf *to) 605 { 606 607 assert(from->istat & ISTAT_INTERNAL); 608 609 /* migrate buffer */ 610 free(to->buf); 611 to->buf = from->buf; 612 from->buf = NULL; 613 614 /* migrate buffer info */ 615 to->len = from->len; 616 to->offset = from->offset; 617 to->maxoff = from->maxoff; 618 } 619 620 void 621 puffs_framev_input(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 622 struct puffs_fctrl_io *fio, struct puffs_putreq *ppr) 623 { 624 struct puffs_framebuf *pufbuf, *appbuf; 625 int rv, complete; 626 627 while ((fio->stat & FIO_DEAD) == 0 && (fio->stat & FIO_ENABLE_R)) { 628 if ((pufbuf = fio->cur_in) == NULL) { 629 pufbuf = puffs_framebuf_make(); 630 if (pufbuf == NULL) 631 return; 632 pufbuf->istat |= ISTAT_INTERNAL; 633 fio->cur_in = pufbuf; 634 } 635 636 complete = 0; 637 rv = fctrl->rfb(pu, pufbuf, fio->io_fd, &complete); 638 639 /* error */ 640 if (rv) { 641 puffs_framev_readclose(pu, fio, rv); 642 fio->cur_in = NULL; 643 if ((pufbuf->istat & ISTAT_DIRECT) == 0) { 644 assert((pufbuf->istat & ISTAT_NODESTROY) == 0); 645 puffs_framebuf_destroy(pufbuf); 646 } 647 return; 648 } 649 650 /* partial read, come back to fight another day */ 651 if (complete == 0) 652 break; 653 654 /* else: full read, process */ 655 if ((pufbuf->istat & ISTAT_DIRECT) == 0) { 656 appbuf = findbuf(pu, fctrl, fio, pufbuf); 657 658 /* XXX: error delivery? */ 659 if (appbuf == NULL) { 660 /* errno = ENOMSG; */ 661 return; 662 } 663 664 moveinfo(pufbuf, appbuf); 665 puffs_framebuf_destroy(pufbuf); 666 } else { 667 appbuf = pufbuf; 668 } 669 appbuf->istat &= ~ISTAT_NODESTROY; 670 fio->cur_in = NULL; 671 672 if (appbuf->pcc) { 673 puffs_docc(appbuf->pcc, ppr); 674 } else if (appbuf->fcb) { 675 appbuf->fcb(pu, appbuf, appbuf->fcb_arg, 0); 676 } else { 677 puffs_framebuf_destroy(appbuf); 678 } 679 680 /* hopeless romantics, here we go again */ 681 } 682 } 683 684 int 685 puffs_framev_output(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 686 struct puffs_fctrl_io *fio, struct puffs_putreq *ppr) 687 { 688 struct puffs_framebuf *pufbuf; 689 int rv, complete, done; 690 691 if (fio->stat & FIO_DEAD) 692 return 0; 693 694 for (pufbuf = TAILQ_FIRST(&fio->snd_qing), done = 0; 695 pufbuf && (fio->stat & FIO_DEAD) == 0 && fio->stat & FIO_ENABLE_W; 696 pufbuf = TAILQ_FIRST(&fio->snd_qing)) { 697 complete = 0; 698 rv = fctrl->wfb(pu, pufbuf, fio->io_fd, &complete); 699 700 if (rv) { 701 puffs_framev_writeclose(pu, fio, rv); 702 done = 1; 703 break; 704 } 705 706 /* partial write */ 707 if (complete == 0) 708 return done; 709 710 /* else, complete write */ 711 TAILQ_REMOVE(&fio->snd_qing, pufbuf, pfb_entries); 712 713 /* can't wait for result if we can't read */ 714 if (fio->stat & FIO_RDGONE) { 715 errnotify(pu, pufbuf, ENXIO); 716 done = 1; 717 } else if ((pufbuf->istat & ISTAT_DIRECT)) { 718 pufbuf->istat &= ~ISTAT_NODESTROY; 719 puffs_docc(pufbuf->pcc, ppr); 720 done = 1; 721 } else if ((pufbuf->istat & ISTAT_NOREPLY) == 0) { 722 TAILQ_INSERT_TAIL(&fio->res_qing, pufbuf, 723 pfb_entries); 724 } else { 725 pufbuf->istat &= ~ISTAT_NODESTROY; 726 puffs_framebuf_destroy(pufbuf); 727 } 728 729 /* omstart! */ 730 } 731 732 return done; 733 } 734 735 int 736 puffs_framev_addfd(struct puffs_usermount *pu, int fd, int what) 737 { 738 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 739 struct puffs_fctrl_io *fio; 740 struct kevent *newevs; 741 struct kevent kev[2]; 742 size_t nfds; 743 int rv, readenable; 744 745 nfds = pfctrl->nfds+1; 746 newevs = realloc(pfctrl->evs, (2*nfds+1) * sizeof(struct kevent)); 747 if (newevs == NULL) 748 return -1; 749 pfctrl->evs = newevs; 750 751 fio = malloc(sizeof(struct puffs_fctrl_io)); 752 if (fio == NULL) 753 return -1; 754 memset(fio, 0, sizeof(struct puffs_fctrl_io)); 755 fio->io_fd = fd; 756 fio->cur_in = NULL; 757 TAILQ_INIT(&fio->snd_qing); 758 TAILQ_INIT(&fio->res_qing); 759 LIST_INIT(&fio->ev_qing); 760 761 readenable = 0; 762 if ((what & PUFFS_FBIO_READ) == 0) 763 readenable = EV_DISABLE; 764 765 if (pu->pu_state & PU_INLOOP) { 766 EV_SET(&kev[0], fd, EVFILT_READ, 767 EV_ADD|readenable, 0, 0, (intptr_t)fio); 768 EV_SET(&kev[1], fd, EVFILT_WRITE, 769 EV_ADD|EV_DISABLE, 0, 0, (intptr_t)fio); 770 rv = kevent(pu->pu_kq, kev, 2, NULL, 0, NULL); 771 if (rv == -1) { 772 free(fio); 773 return -1; 774 } 775 } 776 if (what & PUFFS_FBIO_READ) 777 fio->stat |= FIO_ENABLE_R; 778 if (what & PUFFS_FBIO_WRITE) 779 fio->stat |= FIO_ENABLE_W; 780 781 LIST_INSERT_HEAD(&pfctrl->fb_ios, fio, fio_entries); 782 pfctrl->nfds = nfds; 783 784 return 0; 785 } 786 787 /* 788 * XXX: the following en/disable should be coalesced and executed 789 * only during the actual kevent call. So feel free to fix if 790 * threatened by mindblowing boredom. 791 */ 792 793 int 794 puffs_framev_enablefd(struct puffs_usermount *pu, int fd, int what) 795 { 796 struct kevent kev; 797 struct puffs_fctrl_io *fio; 798 int rv = 0; 799 800 assert((what & (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) != 0); 801 802 fio = getfiobyfd(pu, fd); 803 if (fio == NULL) { 804 errno = ENXIO; 805 return -1; 806 } 807 808 /* write is enabled in the event loop if there is output */ 809 if (what & PUFFS_FBIO_READ && fio->rwait == 0) { 810 EV_SET(&kev, fd, EVFILT_READ, EV_ENABLE, 0, 0, (uintptr_t)fio); 811 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 812 } 813 814 if (rv == 0) { 815 if (what & PUFFS_FBIO_READ) 816 fio->stat |= FIO_ENABLE_R; 817 if (what & PUFFS_FBIO_WRITE) 818 fio->stat |= FIO_ENABLE_W; 819 } 820 821 return rv; 822 } 823 824 int 825 puffs_framev_disablefd(struct puffs_usermount *pu, int fd, int what) 826 { 827 struct kevent kev[2]; 828 struct puffs_fctrl_io *fio; 829 size_t i; 830 int rv; 831 832 assert((what & (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) != 0); 833 834 fio = getfiobyfd(pu, fd); 835 if (fio == NULL) { 836 errno = ENXIO; 837 return -1; 838 } 839 840 i = 0; 841 if (what & PUFFS_FBIO_READ && fio->rwait == 0) { 842 EV_SET(&kev[0], fd, 843 EVFILT_READ, EV_DISABLE, 0, 0, (uintptr_t)fio); 844 i++; 845 } 846 if (what & PUFFS_FBIO_WRITE && fio->stat & FIO_WR && fio->wwait == 0) { 847 EV_SET(&kev[1], fd, 848 EVFILT_WRITE, EV_DISABLE, 0, 0, (uintptr_t)fio); 849 i++; 850 } 851 if (i) 852 rv = kevent(pu->pu_kq, kev, i, NULL, 0, NULL); 853 else 854 rv = 0; 855 856 if (rv == 0) { 857 if (what & PUFFS_FBIO_READ) 858 fio->stat &= ~FIO_ENABLE_R; 859 if (what & PUFFS_FBIO_WRITE) 860 fio->stat &= ~FIO_ENABLE_W; 861 } 862 863 return rv; 864 } 865 866 void 867 puffs_framev_readclose(struct puffs_usermount *pu, 868 struct puffs_fctrl_io *fio, int error) 869 { 870 struct puffs_framebuf *pufbuf; 871 struct kevent kev; 872 int notflag; 873 874 if (fio->stat & FIO_RDGONE || fio->stat & FIO_DEAD) 875 return; 876 fio->stat |= FIO_RDGONE; 877 878 if (fio->cur_in) { 879 if ((fio->cur_in->istat & ISTAT_DIRECT) == 0) { 880 puffs_framebuf_destroy(fio->cur_in); 881 fio->cur_in = NULL; 882 } else { 883 errnotify(pu, fio->cur_in, error); 884 } 885 } 886 887 while ((pufbuf = TAILQ_FIRST(&fio->res_qing)) != NULL) { 888 TAILQ_REMOVE(&fio->res_qing, pufbuf, pfb_entries); 889 errnotify(pu, pufbuf, error); 890 } 891 892 EV_SET(&kev, fio->io_fd, EVFILT_READ, EV_DELETE, 0, 0, 0); 893 (void) kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 894 895 notflag = PUFFS_FBIO_READ; 896 if (fio->stat & FIO_WRGONE) 897 notflag |= PUFFS_FBIO_WRITE; 898 899 if (pu->pu_framectrl.fdnotfn) 900 pu->pu_framectrl.fdnotfn(pu, fio->io_fd, notflag); 901 } 902 903 void 904 puffs_framev_writeclose(struct puffs_usermount *pu, 905 struct puffs_fctrl_io *fio, int error) 906 { 907 struct puffs_framebuf *pufbuf; 908 struct kevent kev; 909 int notflag; 910 911 if (fio->stat & FIO_WRGONE || fio->stat & FIO_DEAD) 912 return; 913 fio->stat |= FIO_WRGONE; 914 915 while ((pufbuf = TAILQ_FIRST(&fio->snd_qing)) != NULL) { 916 TAILQ_REMOVE(&fio->snd_qing, pufbuf, pfb_entries); 917 errnotify(pu, pufbuf, error); 918 } 919 920 EV_SET(&kev, fio->io_fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0); 921 (void) kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 922 923 notflag = PUFFS_FBIO_WRITE; 924 if (fio->stat & FIO_RDGONE) 925 notflag |= PUFFS_FBIO_READ; 926 927 if (pu->pu_framectrl.fdnotfn) 928 pu->pu_framectrl.fdnotfn(pu, fio->io_fd, notflag); 929 } 930 931 static int 932 removefio(struct puffs_usermount *pu, struct puffs_fctrl_io *fio, int error) 933 { 934 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 935 struct puffs_fbevent *fbevp; 936 937 LIST_REMOVE(fio, fio_entries); 938 if (pu->pu_state & PU_INLOOP) { 939 puffs_framev_readclose(pu, fio, error); 940 puffs_framev_writeclose(pu, fio, error); 941 } 942 943 while ((fbevp = LIST_FIRST(&fio->ev_qing)) != NULL) { 944 fbevp->rv = error; 945 LIST_REMOVE(fbevp, pfe_entries); 946 puffs_goto(fbevp->pcc); 947 } 948 949 /* don't bother with realloc */ 950 pfctrl->nfds--; 951 952 /* don't free us yet, might have some references in event arrays */ 953 fio->stat |= FIO_DEAD; 954 LIST_INSERT_HEAD(&pfctrl->fb_ios_rmlist, fio, fio_entries); 955 956 return 0; 957 958 } 959 960 int 961 puffs_framev_removefd(struct puffs_usermount *pu, int fd, int error) 962 { 963 struct puffs_fctrl_io *fio; 964 965 fio = getfiobyfd(pu, fd); 966 if (fio == NULL) { 967 errno = ENXIO; 968 return -1; 969 } 970 971 return removefio(pu, fio, error ? error : ECONNRESET); 972 } 973 974 void 975 puffs_framev_removeonclose(struct puffs_usermount *pu, int fd, int what) 976 { 977 978 if (what == (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) 979 (void) puffs_framev_removefd(pu, fd, ECONNRESET); 980 } 981 982 void 983 puffs_framev_unmountonclose(struct puffs_usermount *pu, int fd, int what) 984 { 985 986 /* XXX & X: unmount is non-sensible */ 987 puffs_framev_removeonclose(pu, fd, what); 988 if (what == (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) 989 PU_SETSTATE(pu, PUFFS_STATE_UNMOUNTED); 990 } 991 992 void 993 puffs_framev_init(struct puffs_usermount *pu, 994 puffs_framev_readframe_fn rfb, puffs_framev_writeframe_fn wfb, 995 puffs_framev_cmpframe_fn cmpfb, puffs_framev_fdnotify_fn fdnotfn) 996 { 997 struct puffs_framectrl *pfctrl; 998 999 pfctrl = &pu->pu_framectrl; 1000 pfctrl->rfb = rfb; 1001 pfctrl->wfb = wfb; 1002 pfctrl->cmpfb = cmpfb; 1003 pfctrl->fdnotfn = fdnotfn; 1004 } 1005 1006 void 1007 puffs_framev_exit(struct puffs_usermount *pu) 1008 { 1009 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 1010 struct puffs_fctrl_io *fio; 1011 1012 while ((fio = LIST_FIRST(&pfctrl->fb_ios)) != NULL) 1013 removefio(pu, fio, ENXIO); 1014 free(pfctrl->evs); 1015 1016 /* closing pu->pu_kq takes care of puffsfd */ 1017 } 1018
Indexes created Thu Oct 02 01:09:59 GMT 2025