framebuf.c revision 1.17
1 /* $NetBSD: framebuf.c,v 1.17 2007/07/20 13:14:55 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 1.17 2007/07/20 13:14:55 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_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(puffs_cc_getusermount(pufbuf->pcc), 302 pufbuf, pufbuf->fcb_arg, error); 303 } else { 304 pufbuf->istat &= ~ISTAT_NODESTROY; 305 puffs_framebuf_destroy(pufbuf); 306 } 307 } 308 309 #define GETFIO(fd) \ 310 do { \ 311 fio = getfiobyfd(pu, fd); \ 312 if (fio == NULL) { \ 313 errno = EINVAL; \ 314 return -1; \ 315 } \ 316 if (fio->stat & FIO_WRGONE) { \ 317 errno = ESHUTDOWN; \ 318 return -1; \ 319 } \ 320 } while (/*CONSTCOND*/0) 321 322 int 323 puffs_framev_enqueue_cc(struct puffs_cc *pcc, int fd, 324 struct puffs_framebuf *pufbuf, int flags) 325 { 326 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 327 struct puffs_fctrl_io *fio; 328 329 /* 330 * Technically we shouldn't allow this is RDGONE, but it's 331 * difficult to trap write close without allowing writes. 332 * And besides, there's probably a disconnect sequence in 333 * the protocol, so unexpectedly getting a closed fd is 334 * most likely an error condition. 335 */ 336 GETFIO(fd); 337 338 pufbuf->pcc = pcc; 339 pufbuf->fcb = NULL; 340 pufbuf->fcb_arg = NULL; 341 342 pufbuf->offset = 0; 343 pufbuf->istat |= ISTAT_NODESTROY; 344 345 if (flags & PUFFS_FBQUEUE_URGENT) 346 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 347 else 348 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 349 350 puffs_cc_yield(pcc); 351 if (pufbuf->rv) { 352 pufbuf->istat &= ~ISTAT_NODESTROY; 353 errno = pufbuf->rv; 354 return -1; 355 } 356 357 return 0; 358 } 359 360 int 361 puffs_framev_enqueue_cb(struct puffs_usermount *pu, int fd, 362 struct puffs_framebuf *pufbuf, puffs_framev_cb fcb, void *arg, 363 int flags) 364 { 365 struct puffs_fctrl_io *fio; 366 367 /* see enqueue_cc */ 368 GETFIO(fd); 369 370 pufbuf->pcc = NULL; 371 pufbuf->fcb = fcb; 372 pufbuf->fcb_arg = arg; 373 374 pufbuf->offset = 0; 375 pufbuf->istat |= ISTAT_NODESTROY; 376 377 if (flags & PUFFS_FBQUEUE_URGENT) 378 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 379 else 380 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 381 382 return 0; 383 } 384 385 int 386 puffs_framev_enqueue_justsend(struct puffs_usermount *pu, int fd, 387 struct puffs_framebuf *pufbuf, int reply, int flags) 388 { 389 struct puffs_fctrl_io *fio; 390 391 GETFIO(fd); 392 393 pufbuf->pcc = NULL; 394 pufbuf->fcb = NULL; 395 pufbuf->fcb_arg = NULL; 396 397 pufbuf->offset = 0; 398 pufbuf->istat |= ISTAT_NODESTROY; 399 if (!reply) 400 pufbuf->istat |= ISTAT_NOREPLY; 401 402 if (flags & PUFFS_FBQUEUE_URGENT) 403 TAILQ_INSERT_HEAD(&fio->snd_qing, pufbuf, pfb_entries); 404 else 405 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 406 407 return 0; 408 } 409 410 /* ARGSUSED */ 411 int 412 puffs_framev_enqueue_directreceive(struct puffs_cc *pcc, int fd, 413 struct puffs_framebuf *pufbuf, int flags /* used in the future */) 414 { 415 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 416 struct puffs_fctrl_io *fio; 417 418 fio = getfiobyfd(pu, fd); 419 if (fio == NULL) { 420 errno = EINVAL; 421 return -1; 422 } 423 424 /* XXX: should have cur_in queue */ 425 assert(fio->cur_in == NULL); 426 fio->cur_in = pufbuf; 427 428 pufbuf->pcc = pcc; 429 pufbuf->fcb = NULL; 430 pufbuf->fcb_arg = NULL; 431 432 pufbuf->offset = 0; 433 pufbuf->istat |= ISTAT_NODESTROY | ISTAT_DIRECT; 434 435 puffs_cc_yield(pcc); 436 pufbuf->istat &= ~ISTAT_NODESTROY; /* XXX: not the right place */ 437 if (pufbuf->rv) { 438 errno = pufbuf->rv; 439 return -1; 440 } 441 442 return 0; 443 } 444 445 int 446 puffs_framev_enqueue_directsend(struct puffs_cc *pcc, int fd, 447 struct puffs_framebuf *pufbuf, int flags) 448 { 449 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 450 struct puffs_fctrl_io *fio; 451 452 if (flags & PUFFS_FBQUEUE_URGENT) 453 abort(); /* EOPNOTSUPP for now */ 454 455 GETFIO(fd); 456 457 pufbuf->pcc = pcc; 458 pufbuf->fcb = NULL; 459 pufbuf->fcb_arg = NULL; 460 461 pufbuf->offset = 0; 462 pufbuf->istat |= ISTAT_NODESTROY | ISTAT_DIRECT; 463 464 TAILQ_INSERT_TAIL(&fio->snd_qing, pufbuf, pfb_entries); 465 466 puffs_cc_yield(pcc); 467 if (pufbuf->rv) { 468 pufbuf->istat &= ~ISTAT_NODESTROY; 469 errno = pufbuf->rv; 470 return -1; 471 } 472 473 return 0; 474 } 475 476 /* 477 * this beauty shall remain undocumented for now 478 */ 479 int 480 puffs_framev_framebuf_ccpromote(struct puffs_framebuf *pufbuf, 481 struct puffs_cc *pcc) 482 { 483 484 if ((pufbuf->istat & ISTAT_ONQUEUE) == 0) { 485 errno = EBUSY; 486 return -1; 487 } 488 489 pufbuf->pcc = pcc; 490 pufbuf->fcb = NULL; 491 pufbuf->fcb_arg = NULL; 492 pufbuf->istat &= ~ISTAT_NOREPLY; 493 494 puffs_cc_yield(pcc); 495 496 return 0; 497 } 498 499 int 500 puffs_framev_enqueue_waitevent(struct puffs_cc *pcc, int fd, int *what) 501 { 502 struct puffs_usermount *pu = puffs_cc_getusermount(pcc); 503 struct puffs_fctrl_io *fio; 504 struct puffs_fbevent feb; 505 struct kevent kev; 506 int rv, svwhat; 507 508 svwhat = *what; 509 510 if (*what == 0) { 511 errno = EINVAL; 512 return -1; 513 } 514 515 fio = getfiobyfd(pu, fd); 516 if (fio == NULL) { 517 errno = EINVAL; 518 return -1; 519 } 520 521 feb.pcc = pcc; 522 feb.what = *what & (PUFFS_FBIO_READ|PUFFS_FBIO_WRITE|PUFFS_FBIO_ERROR); 523 524 if (*what & PUFFS_FBIO_READ) 525 if ((fio->stat & FIO_ENABLE_R) == 0) 526 EV_SET(&kev, fd, EVFILT_READ, EV_ENABLE, 527 0, 0, (uintptr_t)fio); 528 529 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 530 if (rv != 0) 531 return errno; 532 533 if (*what & PUFFS_FBIO_READ) 534 fio->rwait++; 535 if (*what & PUFFS_FBIO_WRITE) 536 fio->wwait++; 537 538 LIST_INSERT_HEAD(&fio->ev_qing, &feb, pfe_entries); 539 puffs_cc_yield(pcc); 540 541 assert(svwhat == *what); 542 543 if (*what & PUFFS_FBIO_READ) { 544 fio->rwait--; 545 if (fio->rwait == 0 && (fio->stat & FIO_ENABLE_R) == 0) { 546 EV_SET(&kev, fd, EVFILT_READ, EV_DISABLE, 547 0, 0, (uintptr_t)fio); 548 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 549 #if 0 550 if (rv != 0) 551 /* XXXXX oh dear */; 552 #endif 553 } 554 } 555 if (*what & PUFFS_FBIO_WRITE) 556 fio->wwait--; 557 558 if (feb.rv == 0) 559 *what = feb.what; 560 else 561 *what = POLLERR; 562 563 return feb.rv; 564 } 565 566 void 567 puffs_framev_notify(struct puffs_fctrl_io *fio, int what) 568 { 569 struct puffs_fbevent *fbevp; 570 571 restart: 572 LIST_FOREACH(fbevp, &fio->ev_qing, pfe_entries) { 573 if (fbevp->what & what) { 574 fbevp->what = what; 575 fbevp->rv = 0; 576 LIST_REMOVE(fbevp, pfe_entries); 577 puffs_cc_continue(fbevp->pcc); 578 goto restart; 579 } 580 } 581 } 582 583 static struct puffs_framebuf * 584 findbuf(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 585 struct puffs_fctrl_io *fio, struct puffs_framebuf *findme) 586 { 587 struct puffs_framebuf *cand; 588 589 TAILQ_FOREACH(cand, &fio->res_qing, pfb_entries) 590 if (fctrl->cmpfb(pu, findme, cand) == 0) 591 break; 592 593 if (cand == NULL) 594 return NULL; 595 596 TAILQ_REMOVE(&fio->res_qing, cand, pfb_entries); 597 return cand; 598 } 599 600 static void 601 moveinfo(struct puffs_framebuf *from, struct puffs_framebuf *to) 602 { 603 604 assert(from->istat & ISTAT_INTERNAL); 605 606 /* migrate buffer */ 607 free(to->buf); 608 to->buf = from->buf; 609 from->buf = NULL; 610 611 /* migrate buffer info */ 612 to->len = from->len; 613 to->offset = from->offset; 614 to->maxoff = from->maxoff; 615 } 616 617 void 618 puffs_framev_input(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 619 struct puffs_fctrl_io *fio, struct puffs_putreq *ppr) 620 { 621 struct puffs_framebuf *pufbuf, *appbuf; 622 int rv, complete; 623 624 while ((fio->stat & FIO_DEAD) == 0 && (fio->stat & FIO_ENABLE_R)) { 625 if ((pufbuf = fio->cur_in) == NULL) { 626 pufbuf = puffs_framebuf_make(); 627 if (pufbuf == NULL) 628 return; 629 pufbuf->istat |= ISTAT_INTERNAL; 630 fio->cur_in = pufbuf; 631 } 632 633 complete = 0; 634 rv = fctrl->rfb(pu, pufbuf, fio->io_fd, &complete); 635 636 /* error */ 637 if (rv) { 638 puffs_framev_readclose(pu, fio, rv); 639 fio->cur_in = NULL; 640 if ((pufbuf->istat & ISTAT_DIRECT) == 0) { 641 assert((pufbuf->istat & ISTAT_NODESTROY) == 0); 642 puffs_framebuf_destroy(pufbuf); 643 } 644 return; 645 } 646 647 /* partial read, come back to fight another day */ 648 if (complete == 0) 649 break; 650 651 /* else: full read, process */ 652 if ((pufbuf->istat & ISTAT_DIRECT) == 0) { 653 appbuf = findbuf(pu, fctrl, fio, pufbuf); 654 655 /* XXX: error delivery? */ 656 if (appbuf == NULL) { 657 /* errno = ENOMSG; */ 658 return; 659 } 660 661 moveinfo(pufbuf, appbuf); 662 puffs_framebuf_destroy(pufbuf); 663 } else { 664 appbuf = pufbuf; 665 } 666 appbuf->istat &= ~ISTAT_NODESTROY; 667 fio->cur_in = NULL; 668 669 if (appbuf->pcc) { 670 puffs_docc(appbuf->pcc, ppr); 671 } else if (appbuf->fcb) { 672 appbuf->fcb(pu, appbuf, appbuf->fcb_arg, 0); 673 } else { 674 puffs_framebuf_destroy(appbuf); 675 } 676 677 /* hopeless romantics, here we go again */ 678 } 679 } 680 681 int 682 puffs_framev_output(struct puffs_usermount *pu, struct puffs_framectrl *fctrl, 683 struct puffs_fctrl_io *fio, struct puffs_putreq *ppr) 684 { 685 struct puffs_framebuf *pufbuf, *pufbuf_next; 686 int rv, complete, done; 687 688 if (fio->stat & FIO_DEAD) 689 return 0; 690 691 for (pufbuf = TAILQ_FIRST(&fio->snd_qing), done = 0; 692 pufbuf && (fio->stat & FIO_DEAD) == 0 && fio->stat & FIO_ENABLE_W; 693 pufbuf = pufbuf_next) { 694 complete = 0; 695 pufbuf_next = TAILQ_NEXT(pufbuf, pfb_entries); 696 rv = fctrl->wfb(pu, pufbuf, fio->io_fd, &complete); 697 698 if (rv) { 699 puffs_framev_writeclose(pu, fio, rv); 700 done = 1; 701 break; 702 } 703 704 /* partial write */ 705 if (complete == 0) 706 return done; 707 708 /* else, complete write */ 709 TAILQ_REMOVE(&fio->snd_qing, pufbuf, pfb_entries); 710 711 /* can't wait for result if we can't read */ 712 if (fio->stat & FIO_RDGONE) { 713 errnotify(pufbuf, ENXIO); 714 done = 1; 715 } else if ((pufbuf->istat & ISTAT_DIRECT)) { 716 pufbuf->istat &= ~ISTAT_NODESTROY; 717 puffs_docc(pufbuf->pcc, ppr); 718 done = 1; 719 } else if ((pufbuf->istat & ISTAT_NOREPLY) == 0) { 720 TAILQ_INSERT_TAIL(&fio->res_qing, pufbuf, 721 pfb_entries); 722 } else { 723 pufbuf->istat &= ~ISTAT_NODESTROY; 724 puffs_framebuf_destroy(pufbuf); 725 } 726 727 /* omstart! */ 728 } 729 730 return done; 731 } 732 733 int 734 puffs_framev_addfd(struct puffs_usermount *pu, int fd, int what) 735 { 736 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 737 struct puffs_fctrl_io *fio; 738 struct kevent *newevs; 739 struct kevent kev[2]; 740 size_t nfds; 741 int rv, readenable; 742 743 nfds = pfctrl->nfds+1; 744 newevs = realloc(pfctrl->evs, (2*nfds+1) * sizeof(struct kevent)); 745 if (newevs == NULL) 746 return -1; 747 pfctrl->evs = newevs; 748 749 fio = malloc(sizeof(struct puffs_fctrl_io)); 750 if (fio == NULL) 751 return -1; 752 memset(fio, 0, sizeof(struct puffs_fctrl_io)); 753 fio->io_fd = fd; 754 fio->cur_in = NULL; 755 TAILQ_INIT(&fio->snd_qing); 756 TAILQ_INIT(&fio->res_qing); 757 LIST_INIT(&fio->ev_qing); 758 759 readenable = 0; 760 if ((what & PUFFS_FBIO_READ) == 0) 761 readenable = EV_DISABLE; 762 763 if (pu->pu_state & PU_INLOOP) { 764 EV_SET(&kev[0], fd, EVFILT_READ, 765 EV_ADD|readenable, 0, 0, (intptr_t)fio); 766 EV_SET(&kev[1], fd, EVFILT_WRITE, 767 EV_ADD|EV_DISABLE, 0, 0, (intptr_t)fio); 768 rv = kevent(pu->pu_kq, kev, 2, NULL, 0, NULL); 769 if (rv == -1) { 770 free(fio); 771 return -1; 772 } 773 } 774 if (what & PUFFS_FBIO_READ) 775 fio->stat |= FIO_ENABLE_R; 776 if (what & PUFFS_FBIO_WRITE) 777 fio->stat |= FIO_ENABLE_W; 778 779 LIST_INSERT_HEAD(&pfctrl->fb_ios, fio, fio_entries); 780 pfctrl->nfds = nfds; 781 782 return 0; 783 } 784 785 /* 786 * XXX: the following en/disable should be coalesced and executed 787 * only during the actual kevent call. So feel free to fix if 788 * threatened by mindblowing boredom. 789 */ 790 791 int 792 puffs_framev_enablefd(struct puffs_usermount *pu, int fd, int what) 793 { 794 struct kevent kev; 795 struct puffs_fctrl_io *fio; 796 int rv = 0; 797 798 assert((what & (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) != 0); 799 800 fio = getfiobyfd(pu, fd); 801 if (fio == NULL) { 802 errno = ENXIO; 803 return -1; 804 } 805 806 /* write is enabled in the event loop if there is output */ 807 if (what & PUFFS_FBIO_READ && fio->rwait == 0) { 808 EV_SET(&kev, fd, EVFILT_READ, EV_ENABLE, 0, 0, (uintptr_t)fio); 809 rv = kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 810 } 811 812 if (rv == 0) { 813 if (what & PUFFS_FBIO_READ) 814 fio->stat |= FIO_ENABLE_R; 815 if (what & PUFFS_FBIO_WRITE) 816 fio->stat |= FIO_ENABLE_W; 817 } 818 819 return rv; 820 } 821 822 int 823 puffs_framev_disablefd(struct puffs_usermount *pu, int fd, int what) 824 { 825 struct kevent kev[2]; 826 struct puffs_fctrl_io *fio; 827 size_t i; 828 int rv; 829 830 assert((what & (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) != 0); 831 832 fio = getfiobyfd(pu, fd); 833 if (fio == NULL) { 834 errno = ENXIO; 835 return -1; 836 } 837 838 i = 0; 839 if (what & PUFFS_FBIO_READ && fio->rwait == 0) { 840 EV_SET(&kev[0], fd, 841 EVFILT_READ, EV_DISABLE, 0, 0, (uintptr_t)fio); 842 i++; 843 } 844 if (what & PUFFS_FBIO_WRITE && fio->stat & FIO_WR && fio->wwait == 0) { 845 EV_SET(&kev[1], fd, 846 EVFILT_WRITE, EV_DISABLE, 0, 0, (uintptr_t)fio); 847 i++; 848 } 849 if (i) 850 rv = kevent(pu->pu_kq, kev, i, NULL, 0, NULL); 851 else 852 rv = 0; 853 854 if (rv == 0) { 855 if (what & PUFFS_FBIO_READ) 856 fio->stat &= ~FIO_ENABLE_R; 857 if (what & PUFFS_FBIO_WRITE) 858 fio->stat &= ~FIO_ENABLE_W; 859 } 860 861 return rv; 862 } 863 864 void 865 puffs_framev_readclose(struct puffs_usermount *pu, 866 struct puffs_fctrl_io *fio, int error) 867 { 868 struct puffs_framebuf *pufbuf; 869 struct kevent kev; 870 int notflag; 871 872 if (fio->stat & FIO_RDGONE || fio->stat & FIO_DEAD) 873 return; 874 fio->stat |= FIO_RDGONE; 875 876 if (fio->cur_in) { 877 if ((fio->cur_in->istat & ISTAT_DIRECT) == 0) { 878 puffs_framebuf_destroy(fio->cur_in); 879 fio->cur_in = NULL; 880 } else { 881 errnotify(fio->cur_in, error); 882 } 883 } 884 885 while ((pufbuf = TAILQ_FIRST(&fio->res_qing)) != NULL) { 886 TAILQ_REMOVE(&fio->res_qing, pufbuf, pfb_entries); 887 errnotify(pufbuf, error); 888 } 889 890 EV_SET(&kev, fio->io_fd, EVFILT_READ, EV_DELETE, 0, 0, 0); 891 (void) kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 892 893 notflag = PUFFS_FBIO_READ; 894 if (fio->stat & FIO_WRGONE) 895 notflag |= PUFFS_FBIO_WRITE; 896 897 if (pu->pu_framectrl.fdnotfn) 898 pu->pu_framectrl.fdnotfn(pu, fio->io_fd, notflag); 899 } 900 901 void 902 puffs_framev_writeclose(struct puffs_usermount *pu, 903 struct puffs_fctrl_io *fio, int error) 904 { 905 struct puffs_framebuf *pufbuf; 906 struct kevent kev; 907 int notflag; 908 909 if (fio->stat & FIO_WRGONE || fio->stat & FIO_DEAD) 910 return; 911 fio->stat |= FIO_WRGONE; 912 913 while ((pufbuf = TAILQ_FIRST(&fio->snd_qing)) != NULL) { 914 TAILQ_REMOVE(&fio->snd_qing, pufbuf, pfb_entries); 915 errnotify(pufbuf, error); 916 } 917 918 EV_SET(&kev, fio->io_fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0); 919 (void) kevent(pu->pu_kq, &kev, 1, NULL, 0, NULL); 920 921 notflag = PUFFS_FBIO_WRITE; 922 if (fio->stat & FIO_RDGONE) 923 notflag |= PUFFS_FBIO_READ; 924 925 if (pu->pu_framectrl.fdnotfn) 926 pu->pu_framectrl.fdnotfn(pu, fio->io_fd, notflag); 927 } 928 929 static int 930 removefio(struct puffs_usermount *pu, struct puffs_fctrl_io *fio, int error) 931 { 932 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 933 struct puffs_fbevent *fbevp; 934 935 LIST_REMOVE(fio, fio_entries); 936 if (pu->pu_state & PU_INLOOP) { 937 puffs_framev_readclose(pu, fio, error); 938 puffs_framev_writeclose(pu, fio, error); 939 } 940 941 while ((fbevp = LIST_FIRST(&fio->ev_qing)) != NULL) { 942 fbevp->rv = error; 943 LIST_REMOVE(fbevp, pfe_entries); 944 puffs_goto(fbevp->pcc); 945 } 946 947 /* don't bother with realloc */ 948 pfctrl->nfds--; 949 950 /* don't free us yet, might have some references in event arrays */ 951 fio->stat |= FIO_DEAD; 952 LIST_INSERT_HEAD(&pfctrl->fb_ios_rmlist, fio, fio_entries); 953 954 return 0; 955 956 } 957 958 int 959 puffs_framev_removefd(struct puffs_usermount *pu, int fd, int error) 960 { 961 struct puffs_fctrl_io *fio; 962 963 fio = getfiobyfd(pu, fd); 964 if (fio == NULL) { 965 errno = ENXIO; 966 return -1; 967 } 968 969 return removefio(pu, fio, error ? error : ECONNRESET); 970 } 971 972 void 973 puffs_framev_removeonclose(struct puffs_usermount *pu, int fd, int what) 974 { 975 976 if (what == (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) 977 (void) puffs_framev_removefd(pu, fd, ECONNRESET); 978 } 979 980 void 981 puffs_framev_unmountonclose(struct puffs_usermount *pu, int fd, int what) 982 { 983 984 /* XXX & X: unmount is non-sensible */ 985 puffs_framev_removeonclose(pu, fd, what); 986 if (what == (PUFFS_FBIO_READ | PUFFS_FBIO_WRITE)) 987 PU_SETSTATE(pu, PUFFS_STATE_UNMOUNTED); 988 } 989 990 void 991 puffs_framev_init(struct puffs_usermount *pu, 992 puffs_framev_readframe_fn rfb, puffs_framev_writeframe_fn wfb, 993 puffs_framev_cmpframe_fn cmpfb, puffs_framev_fdnotify_fn fdnotfn) 994 { 995 struct puffs_framectrl *pfctrl; 996 997 pfctrl = &pu->pu_framectrl; 998 pfctrl->rfb = rfb; 999 pfctrl->wfb = wfb; 1000 pfctrl->cmpfb = cmpfb; 1001 pfctrl->fdnotfn = fdnotfn; 1002 } 1003 1004 void 1005 puffs_framev_exit(struct puffs_usermount *pu) 1006 { 1007 struct puffs_framectrl *pfctrl = &pu->pu_framectrl; 1008 struct puffs_fctrl_io *fio; 1009 1010 while ((fio = LIST_FIRST(&pfctrl->fb_ios)) != NULL) 1011 removefio(pu, fio, ENXIO); 1012 free(pfctrl->evs); 1013 1014 /* closing pu->pu_kq takes care of puffsfd */ 1015 } 1016
Indexes created Sun Sep 21 20:09:37 GMT 2025