1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94 39 * $FreeBSD: src/sys/kern/sys_generic.c,v 1.55.2.10 2001/03/17 10:39:32 peter Exp $ 40 * $DragonFly: src/sys/kern/sys_generic.c,v 1.49 2008/05/05 22:09:44 dillon Exp $ 41 */ 42 43 #include "opt_ktrace.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/sysproto.h> 48 #include <sys/event.h> 49 #include <sys/filedesc.h> 50 #include <sys/filio.h> 51 #include <sys/fcntl.h> 52 #include <sys/file.h> 53 #include <sys/proc.h> 54 #include <sys/signalvar.h> 55 #include <sys/socketvar.h> 56 #include <sys/uio.h> 57 #include <sys/kernel.h> 58 #include <sys/kern_syscall.h> 59 #include <sys/malloc.h> 60 #include <sys/mapped_ioctl.h> 61 #include <sys/poll.h> 62 #include <sys/queue.h> 63 #include <sys/resourcevar.h> 64 #include <sys/socketops.h> 65 #include <sys/sysctl.h> 66 #include <sys/sysent.h> 67 #include <sys/buf.h> 68 #ifdef KTRACE 69 #include <sys/ktrace.h> 70 #endif 71 #include <vm/vm.h> 72 #include <vm/vm_page.h> 73 74 #include <sys/file2.h> 75 #include <sys/mplock2.h> 76 #include <sys/spinlock2.h> 77 78 #include <machine/limits.h> 79 80 static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer"); 81 static MALLOC_DEFINE(M_IOCTLMAP, "ioctlmap", "mapped ioctl handler buffer"); 82 static MALLOC_DEFINE(M_SELECT, "select", "select() buffer"); 83 MALLOC_DEFINE(M_IOV, "iov", "large iov's"); 84 85 typedef struct kfd_set { 86 fd_mask fds_bits[2]; 87 } kfd_set; 88 89 enum select_copyin_states { 90 COPYIN_READ, COPYIN_WRITE, COPYIN_EXCEPT, COPYIN_DONE }; 91 92 struct select_kevent_copyin_args { 93 kfd_set *read_set; 94 kfd_set *write_set; 95 kfd_set *except_set; 96 int active_set; /* One of select_copyin_states */ 97 struct lwp *lwp; /* Pointer to our lwp */ 98 int num_fds; /* Number of file descriptors (syscall arg) */ 99 int proc_fds; /* Processed fd's (wraps) */ 100 int error; /* Returned to userland */ 101 }; 102 103 struct poll_kevent_copyin_args { 104 struct lwp *lwp; 105 struct pollfd *fds; 106 int nfds; 107 int pfds; 108 int error; 109 }; 110 111 static struct lwkt_token mioctl_token = LWKT_TOKEN_MP_INITIALIZER(mioctl_token); 112 113 static int doselect(int nd, fd_set *in, fd_set *ou, fd_set *ex, 114 struct timespec *ts, int *res); 115 static int dopoll(int nfds, struct pollfd *fds, struct timespec *ts, 116 int *res); 117 static int dofileread(int, struct file *, struct uio *, int, size_t *); 118 static int dofilewrite(int, struct file *, struct uio *, int, size_t *); 119 120 /* 121 * Read system call. 122 * 123 * MPSAFE 124 */ 125 int 126 sys_read(struct read_args *uap) 127 { 128 struct thread *td = curthread; 129 struct uio auio; 130 struct iovec aiov; 131 int error; 132 133 if ((ssize_t)uap->nbyte < 0) 134 error = EINVAL; 135 136 aiov.iov_base = uap->buf; 137 aiov.iov_len = uap->nbyte; 138 auio.uio_iov = &aiov; 139 auio.uio_iovcnt = 1; 140 auio.uio_offset = -1; 141 auio.uio_resid = uap->nbyte; 142 auio.uio_rw = UIO_READ; 143 auio.uio_segflg = UIO_USERSPACE; 144 auio.uio_td = td; 145 146 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult); 147 return(error); 148 } 149 150 /* 151 * Positioned (Pread) read system call 152 * 153 * MPSAFE 154 */ 155 int 156 sys_extpread(struct extpread_args *uap) 157 { 158 struct thread *td = curthread; 159 struct uio auio; 160 struct iovec aiov; 161 int error; 162 int flags; 163 164 if ((ssize_t)uap->nbyte < 0) 165 return(EINVAL); 166 167 aiov.iov_base = uap->buf; 168 aiov.iov_len = uap->nbyte; 169 auio.uio_iov = &aiov; 170 auio.uio_iovcnt = 1; 171 auio.uio_offset = uap->offset; 172 auio.uio_resid = uap->nbyte; 173 auio.uio_rw = UIO_READ; 174 auio.uio_segflg = UIO_USERSPACE; 175 auio.uio_td = td; 176 177 flags = uap->flags & O_FMASK; 178 if (uap->offset != (off_t)-1) 179 flags |= O_FOFFSET; 180 181 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult); 182 return(error); 183 } 184 185 /* 186 * Scatter read system call. 187 * 188 * MPSAFE 189 */ 190 int 191 sys_readv(struct readv_args *uap) 192 { 193 struct thread *td = curthread; 194 struct uio auio; 195 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 196 int error; 197 198 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt, 199 &auio.uio_resid); 200 if (error) 201 return (error); 202 auio.uio_iov = iov; 203 auio.uio_iovcnt = uap->iovcnt; 204 auio.uio_offset = -1; 205 auio.uio_rw = UIO_READ; 206 auio.uio_segflg = UIO_USERSPACE; 207 auio.uio_td = td; 208 209 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult); 210 211 iovec_free(&iov, aiov); 212 return (error); 213 } 214 215 216 /* 217 * Scatter positioned read system call. 218 * 219 * MPSAFE 220 */ 221 int 222 sys_extpreadv(struct extpreadv_args *uap) 223 { 224 struct thread *td = curthread; 225 struct uio auio; 226 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 227 int error; 228 int flags; 229 230 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt, 231 &auio.uio_resid); 232 if (error) 233 return (error); 234 auio.uio_iov = iov; 235 auio.uio_iovcnt = uap->iovcnt; 236 auio.uio_offset = uap->offset; 237 auio.uio_rw = UIO_READ; 238 auio.uio_segflg = UIO_USERSPACE; 239 auio.uio_td = td; 240 241 flags = uap->flags & O_FMASK; 242 if (uap->offset != (off_t)-1) 243 flags |= O_FOFFSET; 244 245 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult); 246 247 iovec_free(&iov, aiov); 248 return(error); 249 } 250 251 /* 252 * MPSAFE 253 */ 254 int 255 kern_preadv(int fd, struct uio *auio, int flags, size_t *res) 256 { 257 struct thread *td = curthread; 258 struct proc *p = td->td_proc; 259 struct file *fp; 260 int error; 261 262 KKASSERT(p); 263 264 fp = holdfp(p->p_fd, fd, FREAD); 265 if (fp == NULL) 266 return (EBADF); 267 if (flags & O_FOFFSET && fp->f_type != DTYPE_VNODE) { 268 error = ESPIPE; 269 } else { 270 error = dofileread(fd, fp, auio, flags, res); 271 } 272 fdrop(fp); 273 return(error); 274 } 275 276 /* 277 * Common code for readv and preadv that reads data in 278 * from a file using the passed in uio, offset, and flags. 279 * 280 * MPALMOSTSAFE - ktrace needs help 281 */ 282 static int 283 dofileread(int fd, struct file *fp, struct uio *auio, int flags, size_t *res) 284 { 285 int error; 286 size_t len; 287 #ifdef KTRACE 288 struct thread *td = curthread; 289 struct iovec *ktriov = NULL; 290 struct uio ktruio; 291 #endif 292 293 #ifdef KTRACE 294 /* 295 * if tracing, save a copy of iovec 296 */ 297 if (KTRPOINT(td, KTR_GENIO)) { 298 int iovlen = auio->uio_iovcnt * sizeof(struct iovec); 299 300 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 301 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 302 ktruio = *auio; 303 } 304 #endif 305 len = auio->uio_resid; 306 error = fo_read(fp, auio, fp->f_cred, flags); 307 if (error) { 308 if (auio->uio_resid != len && (error == ERESTART || 309 error == EINTR || error == EWOULDBLOCK)) 310 error = 0; 311 } 312 #ifdef KTRACE 313 if (ktriov != NULL) { 314 if (error == 0) { 315 ktruio.uio_iov = ktriov; 316 ktruio.uio_resid = len - auio->uio_resid; 317 get_mplock(); 318 ktrgenio(td->td_lwp, fd, UIO_READ, &ktruio, error); 319 rel_mplock(); 320 } 321 FREE(ktriov, M_TEMP); 322 } 323 #endif 324 if (error == 0) 325 *res = len - auio->uio_resid; 326 327 return(error); 328 } 329 330 /* 331 * Write system call 332 * 333 * MPSAFE 334 */ 335 int 336 sys_write(struct write_args *uap) 337 { 338 struct thread *td = curthread; 339 struct uio auio; 340 struct iovec aiov; 341 int error; 342 343 if ((ssize_t)uap->nbyte < 0) 344 error = EINVAL; 345 346 aiov.iov_base = (void *)(uintptr_t)uap->buf; 347 aiov.iov_len = uap->nbyte; 348 auio.uio_iov = &aiov; 349 auio.uio_iovcnt = 1; 350 auio.uio_offset = -1; 351 auio.uio_resid = uap->nbyte; 352 auio.uio_rw = UIO_WRITE; 353 auio.uio_segflg = UIO_USERSPACE; 354 auio.uio_td = td; 355 356 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult); 357 358 return(error); 359 } 360 361 /* 362 * Pwrite system call 363 * 364 * MPSAFE 365 */ 366 int 367 sys_extpwrite(struct extpwrite_args *uap) 368 { 369 struct thread *td = curthread; 370 struct uio auio; 371 struct iovec aiov; 372 int error; 373 int flags; 374 375 if ((ssize_t)uap->nbyte < 0) 376 error = EINVAL; 377 378 aiov.iov_base = (void *)(uintptr_t)uap->buf; 379 aiov.iov_len = uap->nbyte; 380 auio.uio_iov = &aiov; 381 auio.uio_iovcnt = 1; 382 auio.uio_offset = uap->offset; 383 auio.uio_resid = uap->nbyte; 384 auio.uio_rw = UIO_WRITE; 385 auio.uio_segflg = UIO_USERSPACE; 386 auio.uio_td = td; 387 388 flags = uap->flags & O_FMASK; 389 if (uap->offset != (off_t)-1) 390 flags |= O_FOFFSET; 391 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult); 392 return(error); 393 } 394 395 /* 396 * MPSAFE 397 */ 398 int 399 sys_writev(struct writev_args *uap) 400 { 401 struct thread *td = curthread; 402 struct uio auio; 403 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 404 int error; 405 406 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt, 407 &auio.uio_resid); 408 if (error) 409 return (error); 410 auio.uio_iov = iov; 411 auio.uio_iovcnt = uap->iovcnt; 412 auio.uio_offset = -1; 413 auio.uio_rw = UIO_WRITE; 414 auio.uio_segflg = UIO_USERSPACE; 415 auio.uio_td = td; 416 417 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult); 418 419 iovec_free(&iov, aiov); 420 return (error); 421 } 422 423 424 /* 425 * Gather positioned write system call 426 * 427 * MPSAFE 428 */ 429 int 430 sys_extpwritev(struct extpwritev_args *uap) 431 { 432 struct thread *td = curthread; 433 struct uio auio; 434 struct iovec aiov[UIO_SMALLIOV], *iov = NULL; 435 int error; 436 int flags; 437 438 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt, 439 &auio.uio_resid); 440 if (error) 441 return (error); 442 auio.uio_iov = iov; 443 auio.uio_iovcnt = uap->iovcnt; 444 auio.uio_offset = uap->offset; 445 auio.uio_rw = UIO_WRITE; 446 auio.uio_segflg = UIO_USERSPACE; 447 auio.uio_td = td; 448 449 flags = uap->flags & O_FMASK; 450 if (uap->offset != (off_t)-1) 451 flags |= O_FOFFSET; 452 453 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult); 454 455 iovec_free(&iov, aiov); 456 return(error); 457 } 458 459 /* 460 * MPSAFE 461 */ 462 int 463 kern_pwritev(int fd, struct uio *auio, int flags, size_t *res) 464 { 465 struct thread *td = curthread; 466 struct proc *p = td->td_proc; 467 struct file *fp; 468 int error; 469 470 KKASSERT(p); 471 472 fp = holdfp(p->p_fd, fd, FWRITE); 473 if (fp == NULL) 474 return (EBADF); 475 else if ((flags & O_FOFFSET) && fp->f_type != DTYPE_VNODE) { 476 error = ESPIPE; 477 } else { 478 error = dofilewrite(fd, fp, auio, flags, res); 479 } 480 481 fdrop(fp); 482 return (error); 483 } 484 485 /* 486 * Common code for writev and pwritev that writes data to 487 * a file using the passed in uio, offset, and flags. 488 * 489 * MPALMOSTSAFE - ktrace needs help 490 */ 491 static int 492 dofilewrite(int fd, struct file *fp, struct uio *auio, int flags, size_t *res) 493 { 494 struct thread *td = curthread; 495 struct lwp *lp = td->td_lwp; 496 int error; 497 size_t len; 498 #ifdef KTRACE 499 struct iovec *ktriov = NULL; 500 struct uio ktruio; 501 #endif 502 503 #ifdef KTRACE 504 /* 505 * if tracing, save a copy of iovec and uio 506 */ 507 if (KTRPOINT(td, KTR_GENIO)) { 508 int iovlen = auio->uio_iovcnt * sizeof(struct iovec); 509 510 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 511 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen); 512 ktruio = *auio; 513 } 514 #endif 515 len = auio->uio_resid; 516 error = fo_write(fp, auio, fp->f_cred, flags); 517 if (error) { 518 if (auio->uio_resid != len && (error == ERESTART || 519 error == EINTR || error == EWOULDBLOCK)) 520 error = 0; 521 /* Socket layer is responsible for issuing SIGPIPE. */ 522 if (error == EPIPE) { 523 get_mplock(); 524 lwpsignal(lp->lwp_proc, lp, SIGPIPE); 525 rel_mplock(); 526 } 527 } 528 #ifdef KTRACE 529 if (ktriov != NULL) { 530 if (error == 0) { 531 ktruio.uio_iov = ktriov; 532 ktruio.uio_resid = len - auio->uio_resid; 533 get_mplock(); 534 ktrgenio(lp, fd, UIO_WRITE, &ktruio, error); 535 rel_mplock(); 536 } 537 FREE(ktriov, M_TEMP); 538 } 539 #endif 540 if (error == 0) 541 *res = len - auio->uio_resid; 542 543 return(error); 544 } 545 546 /* 547 * Ioctl system call 548 * 549 * MPSAFE 550 */ 551 int 552 sys_ioctl(struct ioctl_args *uap) 553 { 554 int error; 555 556 error = mapped_ioctl(uap->fd, uap->com, uap->data, NULL, &uap->sysmsg); 557 return (error); 558 } 559 560 struct ioctl_map_entry { 561 const char *subsys; 562 struct ioctl_map_range *cmd_ranges; 563 LIST_ENTRY(ioctl_map_entry) entries; 564 }; 565 566 /* 567 * The true heart of all ioctl syscall handlers (native, emulation). 568 * If map != NULL, it will be searched for a matching entry for com, 569 * and appropriate conversions/conversion functions will be utilized. 570 * 571 * MPSAFE 572 */ 573 int 574 mapped_ioctl(int fd, u_long com, caddr_t uspc_data, struct ioctl_map *map, 575 struct sysmsg *msg) 576 { 577 struct thread *td = curthread; 578 struct proc *p = td->td_proc; 579 struct ucred *cred; 580 struct file *fp; 581 struct ioctl_map_range *iomc = NULL; 582 int error; 583 u_int size; 584 u_long ocom = com; 585 caddr_t data, memp; 586 int tmp; 587 #define STK_PARAMS 128 588 union { 589 char stkbuf[STK_PARAMS]; 590 long align; 591 } ubuf; 592 593 KKASSERT(p); 594 cred = td->td_ucred; 595 596 fp = holdfp(p->p_fd, fd, FREAD|FWRITE); 597 if (fp == NULL) 598 return(EBADF); 599 600 if (map != NULL) { /* obey translation map */ 601 u_long maskcmd; 602 struct ioctl_map_entry *e; 603 604 maskcmd = com & map->mask; 605 606 lwkt_gettoken(&mioctl_token); 607 LIST_FOREACH(e, &map->mapping, entries) { 608 for (iomc = e->cmd_ranges; iomc->start != 0 || 609 iomc->maptocmd != 0 || iomc->wrapfunc != NULL || 610 iomc->mapfunc != NULL; 611 iomc++) { 612 if (maskcmd >= iomc->start && 613 maskcmd <= iomc->end) 614 break; 615 } 616 617 /* Did we find a match? */ 618 if (iomc->start != 0 || iomc->maptocmd != 0 || 619 iomc->wrapfunc != NULL || iomc->mapfunc != NULL) 620 break; 621 } 622 lwkt_reltoken(&mioctl_token); 623 624 if (iomc == NULL || 625 (iomc->start == 0 && iomc->maptocmd == 0 626 && iomc->wrapfunc == NULL && iomc->mapfunc == NULL)) { 627 kprintf("%s: 'ioctl' fd=%d, cmd=0x%lx ('%c',%d) not implemented\n", 628 map->sys, fd, maskcmd, 629 (int)((maskcmd >> 8) & 0xff), 630 (int)(maskcmd & 0xff)); 631 error = EINVAL; 632 goto done; 633 } 634 635 /* 636 * If it's a non-range one to one mapping, maptocmd should be 637 * correct. If it's a ranged one to one mapping, we pass the 638 * original value of com, and for a range mapped to a different 639 * range, we always need a mapping function to translate the 640 * ioctl to our native ioctl. Ex. 6500-65ff <-> 9500-95ff 641 */ 642 if (iomc->start == iomc->end && iomc->maptocmd == iomc->maptoend) { 643 com = iomc->maptocmd; 644 } else if (iomc->start == iomc->maptocmd && iomc->end == iomc->maptoend) { 645 if (iomc->mapfunc != NULL) 646 com = iomc->mapfunc(iomc->start, iomc->end, 647 iomc->start, iomc->end, 648 com, com); 649 } else { 650 if (iomc->mapfunc != NULL) { 651 com = iomc->mapfunc(iomc->start, iomc->end, 652 iomc->maptocmd, iomc->maptoend, 653 com, ocom); 654 } else { 655 kprintf("%s: Invalid mapping for fd=%d, cmd=%#lx ('%c',%d)\n", 656 map->sys, fd, maskcmd, 657 (int)((maskcmd >> 8) & 0xff), 658 (int)(maskcmd & 0xff)); 659 error = EINVAL; 660 goto done; 661 } 662 } 663 } 664 665 switch (com) { 666 case FIONCLEX: 667 error = fclrfdflags(p->p_fd, fd, UF_EXCLOSE); 668 goto done; 669 case FIOCLEX: 670 error = fsetfdflags(p->p_fd, fd, UF_EXCLOSE); 671 goto done; 672 } 673 674 /* 675 * Interpret high order word to find amount of data to be 676 * copied to/from the user's address space. 677 */ 678 size = IOCPARM_LEN(com); 679 if (size > IOCPARM_MAX) { 680 error = ENOTTY; 681 goto done; 682 } 683 684 if (size > sizeof (ubuf.stkbuf)) { 685 memp = kmalloc(size, M_IOCTLOPS, M_WAITOK); 686 data = memp; 687 } else { 688 memp = NULL; 689 data = ubuf.stkbuf; 690 } 691 if ((com & IOC_IN) != 0) { 692 if (size != 0) { 693 error = copyin(uspc_data, data, (size_t)size); 694 if (error) { 695 if (memp != NULL) 696 kfree(memp, M_IOCTLOPS); 697 goto done; 698 } 699 } else { 700 *(caddr_t *)data = uspc_data; 701 } 702 } else if ((com & IOC_OUT) != 0 && size) { 703 /* 704 * Zero the buffer so the user always 705 * gets back something deterministic. 706 */ 707 bzero(data, (size_t)size); 708 } else if ((com & IOC_VOID) != 0) { 709 *(caddr_t *)data = uspc_data; 710 } 711 712 switch (com) { 713 case FIONBIO: 714 if ((tmp = *(int *)data)) 715 atomic_set_int(&fp->f_flag, FNONBLOCK); 716 else 717 atomic_clear_int(&fp->f_flag, FNONBLOCK); 718 error = 0; 719 break; 720 721 case FIOASYNC: 722 if ((tmp = *(int *)data)) 723 atomic_set_int(&fp->f_flag, FASYNC); 724 else 725 atomic_clear_int(&fp->f_flag, FASYNC); 726 error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, cred, msg); 727 break; 728 729 default: 730 /* 731 * If there is a override function, 732 * call it instead of directly routing the call 733 */ 734 if (map != NULL && iomc->wrapfunc != NULL) 735 error = iomc->wrapfunc(fp, com, ocom, data, cred); 736 else 737 error = fo_ioctl(fp, com, data, cred, msg); 738 /* 739 * Copy any data to user, size was 740 * already set and checked above. 741 */ 742 if (error == 0 && (com & IOC_OUT) != 0 && size != 0) 743 error = copyout(data, uspc_data, (size_t)size); 744 break; 745 } 746 if (memp != NULL) 747 kfree(memp, M_IOCTLOPS); 748 done: 749 fdrop(fp); 750 return(error); 751 } 752 753 /* 754 * MPSAFE 755 */ 756 int 757 mapped_ioctl_register_handler(struct ioctl_map_handler *he) 758 { 759 struct ioctl_map_entry *ne; 760 761 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL && 762 he->subsys != NULL && *he->subsys != '\0'); 763 764 ne = kmalloc(sizeof(struct ioctl_map_entry), M_IOCTLMAP, 765 M_WAITOK | M_ZERO); 766 767 ne->subsys = he->subsys; 768 ne->cmd_ranges = he->cmd_ranges; 769 770 lwkt_gettoken(&mioctl_token); 771 LIST_INSERT_HEAD(&he->map->mapping, ne, entries); 772 lwkt_reltoken(&mioctl_token); 773 774 return(0); 775 } 776 777 /* 778 * MPSAFE 779 */ 780 int 781 mapped_ioctl_unregister_handler(struct ioctl_map_handler *he) 782 { 783 struct ioctl_map_entry *ne; 784 int error = EINVAL; 785 786 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL); 787 788 lwkt_gettoken(&mioctl_token); 789 LIST_FOREACH(ne, &he->map->mapping, entries) { 790 if (ne->cmd_ranges == he->cmd_ranges) { 791 LIST_REMOVE(ne, entries); 792 kfree(ne, M_IOCTLMAP); 793 error = 0; 794 break; 795 } 796 } 797 lwkt_reltoken(&mioctl_token); 798 return(error); 799 } 800 801 static int nselcoll; /* Select collisions since boot */ 802 int selwait; 803 SYSCTL_INT(_kern, OID_AUTO, nselcoll, CTLFLAG_RD, &nselcoll, 0, ""); 804 static int nseldebug; 805 SYSCTL_INT(_kern, OID_AUTO, nseldebug, CTLFLAG_RW, &nseldebug, 0, ""); 806 807 /* 808 * Select system call. 809 * 810 * MPSAFE 811 */ 812 int 813 sys_select(struct select_args *uap) 814 { 815 struct timeval ktv; 816 struct timespec *ktsp, kts; 817 int error; 818 819 /* 820 * Get timeout if any. 821 */ 822 if (uap->tv != NULL) { 823 error = copyin(uap->tv, &ktv, sizeof (ktv)); 824 if (error) 825 return (error); 826 TIMEVAL_TO_TIMESPEC(&ktv, &kts); 827 ktsp = &kts; 828 } else { 829 ktsp = NULL; 830 } 831 832 /* 833 * Do real work. 834 */ 835 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp, 836 &uap->sysmsg_result); 837 838 return (error); 839 } 840 841 842 /* 843 * Pselect system call. 844 * 845 * MPALMOSTSAFE 846 */ 847 int 848 sys_pselect(struct pselect_args *uap) 849 { 850 struct thread *td = curthread; 851 struct lwp *lp = td->td_lwp; 852 struct timespec *ktsp, kts; 853 sigset_t sigmask; 854 int error; 855 856 /* 857 * Get timeout if any. 858 */ 859 if (uap->ts != NULL) { 860 error = copyin(uap->ts, &kts, sizeof (kts)); 861 if (error) 862 return (error); 863 ktsp = &kts; 864 } else { 865 ktsp = NULL; 866 } 867 868 /* 869 * Install temporary signal mask if any provided. 870 */ 871 if (uap->sigmask != NULL) { 872 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask)); 873 if (error) 874 return (error); 875 get_mplock(); 876 lp->lwp_oldsigmask = lp->lwp_sigmask; 877 SIG_CANTMASK(sigmask); 878 lp->lwp_sigmask = sigmask; 879 } else { 880 get_mplock(); 881 } 882 883 /* 884 * Do real job. 885 */ 886 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp, 887 &uap->sysmsg_result); 888 889 if (uap->sigmask != NULL) { 890 /* doselect() responsible for turning ERESTART into EINTR */ 891 KKASSERT(error != ERESTART); 892 if (error == EINTR) { 893 /* 894 * We can't restore the previous signal mask now 895 * because it could block the signal that interrupted 896 * us. So make a note to restore it after executing 897 * the handler. 898 */ 899 lp->lwp_flag |= LWP_OLDMASK; 900 } else { 901 /* 902 * No handler to run. Restore previous mask immediately. 903 */ 904 lp->lwp_sigmask = lp->lwp_oldsigmask; 905 } 906 } 907 rel_mplock(); 908 909 return (error); 910 } 911 912 static int 913 select_copyin(void *arg, struct kevent *kevp, int maxevents, int *events) 914 { 915 struct select_kevent_copyin_args *skap = NULL; 916 struct kevent *kev; 917 int fd; 918 kfd_set *fdp = NULL; 919 short filter = 0; 920 u_int fflags = 0; 921 922 skap = (struct select_kevent_copyin_args *)arg; 923 924 if (*events == maxevents) 925 return (0); 926 927 while (skap->active_set < COPYIN_DONE) { 928 switch (skap->active_set) { 929 case COPYIN_READ: 930 /* 931 * Register descriptors for the read filter 932 */ 933 fdp = skap->read_set; 934 filter = EVFILT_READ; 935 fflags = NOTE_OLDAPI; 936 if (fdp) 937 break; 938 ++skap->active_set; 939 skap->proc_fds = 0; 940 /* fall through */ 941 case COPYIN_WRITE: 942 /* 943 * Register descriptors for the write filter 944 */ 945 fdp = skap->write_set; 946 filter = EVFILT_WRITE; 947 fflags = NOTE_OLDAPI; 948 if (fdp) 949 break; 950 ++skap->active_set; 951 skap->proc_fds = 0; 952 /* fall through */ 953 case COPYIN_EXCEPT: 954 /* 955 * Register descriptors for the exception filter 956 */ 957 fdp = skap->except_set; 958 filter = EVFILT_EXCEPT; 959 fflags = NOTE_OLDAPI | NOTE_OOB; 960 if (fdp) 961 break; 962 ++skap->active_set; 963 skap->proc_fds = 0; 964 /* fall through */ 965 case COPYIN_DONE: 966 /* 967 * Nothing left to register 968 */ 969 return(0); 970 /* NOT REACHED */ 971 } 972 973 while (skap->proc_fds < skap->num_fds) { 974 fd = skap->proc_fds; 975 if (FD_ISSET(fd, fdp)) { 976 kev = &kevp[*events]; 977 EV_SET(kev, fd, filter, 978 EV_ADD|EV_ENABLE, 979 fflags, 0, 980 (void *)(uintptr_t) 981 skap->lwp->lwp_kqueue_serial); 982 FD_CLR(fd, fdp); 983 ++*events; 984 985 if (nseldebug) 986 kprintf("select fd %d filter %d serial %d\n", 987 fd, filter, skap->lwp->lwp_kqueue_serial); 988 } 989 ++skap->proc_fds; 990 if (*events == maxevents) 991 return (0); 992 } 993 skap->active_set++; 994 skap->proc_fds = 0; 995 } 996 997 return (0); 998 } 999 1000 static int 1001 select_copyout(void *arg, struct kevent *kevp, int count, int *res) 1002 { 1003 struct select_kevent_copyin_args *skap; 1004 struct kevent kev; 1005 int i = 0; 1006 1007 skap = (struct select_kevent_copyin_args *)arg; 1008 1009 for (i = 0; i < count; ++i) { 1010 /* 1011 * Filter out and delete spurious events 1012 */ 1013 if ((u_int)(uintptr_t)kevp[i].udata != 1014 skap->lwp->lwp_kqueue_serial) { 1015 kev = kevp[i]; 1016 kev.flags = EV_DISABLE|EV_DELETE; 1017 kqueue_register(&skap->lwp->lwp_kqueue, &kev); 1018 if (nseldebug) 1019 kprintf("select fd %ju mismatched serial %d\n", 1020 (uintmax_t)kevp[i].ident, 1021 skap->lwp->lwp_kqueue_serial); 1022 continue; 1023 } 1024 1025 /* 1026 * Handle errors 1027 */ 1028 if (kevp[i].flags & EV_ERROR) { 1029 switch(kevp[i].data) { 1030 case EBADF: 1031 /* 1032 * A bad file descriptor is considered a 1033 * fatal error for select, bail out. 1034 */ 1035 skap->error = EBADF; 1036 *res = 0; 1037 return (1); 1038 break; 1039 default: 1040 /* 1041 * Select silently swallows any unknown errors 1042 * for descriptors in the read or write sets. 1043 * 1044 * ALWAYS filter out EOPNOTSUPP errors from 1045 * filters (at least until all filters support 1046 * EVFILT_EXCEPT) 1047 */ 1048 if (kevp[i].filter != EVFILT_READ && 1049 kevp[i].filter != EVFILT_WRITE && 1050 kevp[i].data != EOPNOTSUPP) { 1051 skap->error = kevp[i].data; 1052 *res = 0; 1053 return (1); 1054 } 1055 break; 1056 } 1057 if (nseldebug) 1058 kprintf("select fd %ju filter %d error %jd\n", 1059 (uintmax_t)kevp[i].ident, 1060 kevp[i].filter, 1061 (intmax_t)kevp[i].data); 1062 continue; 1063 } 1064 1065 switch (kevp[i].filter) { 1066 case EVFILT_READ: 1067 FD_SET(kevp[i].ident, skap->read_set); 1068 break; 1069 case EVFILT_WRITE: 1070 FD_SET(kevp[i].ident, skap->write_set); 1071 break; 1072 case EVFILT_EXCEPT: 1073 FD_SET(kevp[i].ident, skap->except_set); 1074 break; 1075 } 1076 1077 ++*res; 1078 } 1079 1080 return (0); 1081 } 1082 1083 /* 1084 * Copy select bits in from userland. Allocate kernel memory if the 1085 * set is large. 1086 */ 1087 static int 1088 getbits(int bytes, fd_set *in_set, kfd_set **out_set, kfd_set *tmp_set) 1089 { 1090 int error; 1091 1092 if (in_set) { 1093 if (bytes < sizeof(*tmp_set)) 1094 *out_set = tmp_set; 1095 else 1096 *out_set = kmalloc(bytes, M_SELECT, M_WAITOK); 1097 error = copyin(in_set, *out_set, bytes); 1098 } else { 1099 *out_set = NULL; 1100 error = 0; 1101 } 1102 return (error); 1103 } 1104 1105 /* 1106 * Copy returned select bits back out to userland. 1107 */ 1108 static int 1109 putbits(int bytes, kfd_set *in_set, fd_set *out_set) 1110 { 1111 int error; 1112 1113 if (in_set) { 1114 error = copyout(in_set, out_set, bytes); 1115 } else { 1116 error = 0; 1117 } 1118 return (error); 1119 } 1120 1121 /* 1122 * Common code for sys_select() and sys_pselect(). 1123 * 1124 * in, out and ex are userland pointers. ts must point to validated 1125 * kernel-side timeout value or NULL for infinite timeout. res must 1126 * point to syscall return value. 1127 */ 1128 static int 1129 doselect(int nd, fd_set *read, fd_set *write, fd_set *except, 1130 struct timespec *ts, int *res) 1131 { 1132 struct proc *p = curproc; 1133 struct select_kevent_copyin_args *kap, ka; 1134 int bytes, error; 1135 kfd_set read_tmp; 1136 kfd_set write_tmp; 1137 kfd_set except_tmp; 1138 1139 *res = 0; 1140 if (nd < 0) 1141 return (EINVAL); 1142 if (nd > p->p_fd->fd_nfiles) /* limit kmalloc */ 1143 nd = p->p_fd->fd_nfiles; 1144 1145 kap = &ka; 1146 kap->lwp = curthread->td_lwp; 1147 kap->num_fds = nd; 1148 kap->proc_fds = 0; 1149 kap->error = 0; 1150 kap->active_set = COPYIN_READ; 1151 1152 /* 1153 * Calculate bytes based on the number of __fd_mask[] array entries 1154 * multiplied by the size of __fd_mask. 1155 */ 1156 bytes = howmany(nd, __NFDBITS) * sizeof(__fd_mask); 1157 1158 /* kap->read_set = NULL; not needed */ 1159 kap->write_set = NULL; 1160 kap->except_set = NULL; 1161 1162 error = getbits(bytes, read, &kap->read_set, &read_tmp); 1163 if (error == 0) 1164 error = getbits(bytes, write, &kap->write_set, &write_tmp); 1165 if (error == 0) 1166 error = getbits(bytes, except, &kap->except_set, &except_tmp); 1167 if (error) 1168 goto done; 1169 1170 /* 1171 * NOTE: Make sure the max events passed to kern_kevent() is 1172 * effectively unlimited. (nd * 3) accomplishes this. 1173 * 1174 * (*res) continues to increment as returned events are 1175 * loaded in. 1176 */ 1177 error = kern_kevent(&kap->lwp->lwp_kqueue, 0x7FFFFFFF, res, kap, 1178 select_copyin, select_copyout, ts); 1179 if (error == 0) 1180 error = putbits(bytes, kap->read_set, read); 1181 if (error == 0) 1182 error = putbits(bytes, kap->write_set, write); 1183 if (error == 0) 1184 error = putbits(bytes, kap->except_set, except); 1185 1186 /* 1187 * An error from an individual event that should be passed 1188 * back to userland (EBADF) 1189 */ 1190 if (kap->error) 1191 error = kap->error; 1192 1193 /* 1194 * Clean up. 1195 */ 1196 done: 1197 if (kap->read_set && kap->read_set != &read_tmp) 1198 kfree(kap->read_set, M_SELECT); 1199 if (kap->write_set && kap->write_set != &write_tmp) 1200 kfree(kap->write_set, M_SELECT); 1201 if (kap->except_set && kap->except_set != &except_tmp) 1202 kfree(kap->except_set, M_SELECT); 1203 1204 kap->lwp->lwp_kqueue_serial += kap->num_fds; 1205 1206 return (error); 1207 } 1208 1209 /* 1210 * Poll system call. 1211 * 1212 * MPSAFE 1213 */ 1214 int 1215 sys_poll(struct poll_args *uap) 1216 { 1217 struct timespec ts, *tsp; 1218 int error; 1219 1220 if (uap->timeout != INFTIM) { 1221 ts.tv_sec = uap->timeout / 1000; 1222 ts.tv_nsec = (uap->timeout % 1000) * 1000 * 1000; 1223 tsp = &ts; 1224 } else { 1225 tsp = NULL; 1226 } 1227 1228 error = dopoll(uap->nfds, uap->fds, tsp, &uap->sysmsg_result); 1229 1230 return (error); 1231 } 1232 1233 static int 1234 poll_copyin(void *arg, struct kevent *kevp, int maxevents, int *events) 1235 { 1236 struct poll_kevent_copyin_args *pkap; 1237 struct pollfd *pfd; 1238 struct kevent *kev; 1239 int kev_count; 1240 1241 pkap = (struct poll_kevent_copyin_args *)arg; 1242 1243 while (pkap->pfds < pkap->nfds) { 1244 pfd = &pkap->fds[pkap->pfds]; 1245 1246 /* Clear return events */ 1247 pfd->revents = 0; 1248 1249 /* Do not check if fd is equal to -1 */ 1250 if (pfd->fd == -1) { 1251 ++pkap->pfds; 1252 continue; 1253 } 1254 1255 kev_count = 0; 1256 if (pfd->events & (POLLIN | POLLRDNORM)) 1257 kev_count++; 1258 if (pfd->events & (POLLOUT | POLLWRNORM)) 1259 kev_count++; 1260 if (pfd->events & (POLLPRI | POLLRDBAND)) 1261 kev_count++; 1262 1263 if (*events + kev_count > maxevents) 1264 return (0); 1265 1266 /* 1267 * NOTE: A combined serial number and poll array index is 1268 * stored in kev->udata. 1269 */ 1270 kev = &kevp[*events]; 1271 if (pfd->events & (POLLIN | POLLRDNORM)) { 1272 EV_SET(kev++, pfd->fd, EVFILT_READ, EV_ADD|EV_ENABLE, 1273 NOTE_OLDAPI, 0, (void *)(uintptr_t) 1274 (pkap->lwp->lwp_kqueue_serial + pkap->pfds)); 1275 } 1276 if (pfd->events & (POLLOUT | POLLWRNORM)) { 1277 EV_SET(kev++, pfd->fd, EVFILT_WRITE, EV_ADD|EV_ENABLE, 1278 NOTE_OLDAPI, 0, (void *)(uintptr_t) 1279 (pkap->lwp->lwp_kqueue_serial + pkap->pfds)); 1280 } 1281 if (pfd->events & (POLLPRI | POLLRDBAND)) { 1282 EV_SET(kev++, pfd->fd, EVFILT_EXCEPT, EV_ADD|EV_ENABLE, 1283 NOTE_OLDAPI | NOTE_OOB, 0, 1284 (void *)(uintptr_t) 1285 (pkap->lwp->lwp_kqueue_serial + pkap->pfds)); 1286 } 1287 1288 if (nseldebug) { 1289 kprintf("poll index %d/%d fd %d events %08x serial %d\n", 1290 pkap->pfds, pkap->nfds-1, pfd->fd, pfd->events, 1291 pkap->lwp->lwp_kqueue_serial); 1292 } 1293 1294 ++pkap->pfds; 1295 (*events) += kev_count; 1296 } 1297 1298 return (0); 1299 } 1300 1301 static int 1302 poll_copyout(void *arg, struct kevent *kevp, int count, int *res) 1303 { 1304 struct poll_kevent_copyin_args *pkap; 1305 struct pollfd *pfd; 1306 struct kevent kev; 1307 int count_res; 1308 int i; 1309 u_int pi; 1310 1311 pkap = (struct poll_kevent_copyin_args *)arg; 1312 1313 for (i = 0; i < count; ++i) { 1314 /* 1315 * Extract the poll array index and delete spurious events. 1316 * We can easily tell if the serial number is incorrect 1317 * by checking whether the extracted index is out of range. 1318 */ 1319 pi = (u_int)(uintptr_t)kevp[i].udata - 1320 (u_int)pkap->lwp->lwp_kqueue_serial; 1321 1322 if (pi >= pkap->nfds) { 1323 kev = kevp[i]; 1324 kev.flags = EV_DISABLE|EV_DELETE; 1325 kqueue_register(&pkap->lwp->lwp_kqueue, &kev); 1326 if (nseldebug) 1327 kprintf("poll index %d out of range against serial %d\n", 1328 pi, pkap->lwp->lwp_kqueue_serial); 1329 continue; 1330 } 1331 pfd = &pkap->fds[pi]; 1332 if (kevp[i].ident == pfd->fd) { 1333 /* 1334 * A single descriptor may generate an error against 1335 * more than one filter, make sure to set the 1336 * appropriate flags but do not increment (*res) 1337 * more than once. 1338 */ 1339 count_res = (pfd->revents == 0); 1340 if (kevp[i].flags & EV_ERROR) { 1341 switch(kevp[i].data) { 1342 case EBADF: 1343 /* Bad file descriptor */ 1344 if (count_res) 1345 ++*res; 1346 pfd->revents |= POLLNVAL; 1347 break; 1348 default: 1349 /* 1350 * Poll silently swallows any unknown 1351 * errors except in the case of POLLPRI 1352 * (OOB/urgent data). 1353 * 1354 * ALWAYS filter out EOPNOTSUPP errors 1355 * from filters, common applications 1356 * set POLLPRI|POLLRDBAND and most 1357 * filters do not support EVFILT_EXCEPT. 1358 */ 1359 if (kevp[i].filter != EVFILT_READ && 1360 kevp[i].filter != EVFILT_WRITE && 1361 kevp[i].data != EOPNOTSUPP) { 1362 if (count_res == 0) 1363 ++*res; 1364 pfd->revents |= POLLERR; 1365 } 1366 break; 1367 } 1368 if (nseldebug) { 1369 kprintf("poll index %d fd %d " 1370 "filter %d error %jd\n", 1371 pi, pfd->fd, 1372 kevp[i].filter, 1373 (intmax_t)kevp[i].data); 1374 } 1375 continue; 1376 } 1377 1378 switch (kevp[i].filter) { 1379 case EVFILT_READ: 1380 #if 0 1381 /* 1382 * EOF on the read side can indicate a 1383 * half-closed situation and not necessarily 1384 * a disconnect, so depend on the user 1385 * issuing a read() and getting 0 bytes back. 1386 */ 1387 if (kevp[i].flags & EV_EOF) 1388 pfd->revents |= POLLHUP; 1389 #endif 1390 if (pfd->events & POLLIN) 1391 pfd->revents |= POLLIN; 1392 if (pfd->events & POLLRDNORM) 1393 pfd->revents |= POLLRDNORM; 1394 break; 1395 case EVFILT_WRITE: 1396 /* 1397 * As per the OpenGroup POLLHUP is mutually 1398 * exclusive with the writability flags. I 1399 * consider this a bit broken but... 1400 * 1401 * In this case a disconnect is implied even 1402 * for a half-closed (write side) situation. 1403 */ 1404 if (kevp[i].flags & EV_EOF) { 1405 pfd->revents |= POLLHUP; 1406 } else { 1407 if (pfd->events & POLLOUT) 1408 pfd->revents |= POLLOUT; 1409 if (pfd->events & POLLWRNORM) 1410 pfd->revents |= POLLWRNORM; 1411 } 1412 break; 1413 case EVFILT_EXCEPT: 1414 /* 1415 * EV_EOF should never be tagged for this 1416 * filter. 1417 */ 1418 if (pfd->events & POLLPRI) 1419 pfd->revents |= POLLPRI; 1420 if (pfd->events & POLLRDBAND) 1421 pfd->revents |= POLLRDBAND; 1422 break; 1423 } 1424 1425 if (nseldebug) { 1426 kprintf("poll index %d/%d fd %d revents %08x\n", 1427 pi, pkap->nfds, pfd->fd, pfd->revents); 1428 } 1429 1430 if (count_res && pfd->revents) 1431 ++*res; 1432 } else { 1433 if (nseldebug) { 1434 kprintf("poll index %d mismatch %ju/%d\n", 1435 pi, (uintmax_t)kevp[i].ident, pfd->fd); 1436 } 1437 } 1438 } 1439 1440 return (0); 1441 } 1442 1443 static int 1444 dopoll(int nfds, struct pollfd *fds, struct timespec *ts, int *res) 1445 { 1446 struct poll_kevent_copyin_args ka; 1447 struct pollfd sfds[64]; 1448 int bytes; 1449 int error; 1450 1451 *res = 0; 1452 if (nfds < 0) 1453 return (EINVAL); 1454 1455 /* 1456 * This is a bit arbitrary but we need to limit internal kmallocs. 1457 */ 1458 if (nfds > maxfilesperproc * 2) 1459 nfds = maxfilesperproc * 2; 1460 bytes = sizeof(struct pollfd) * nfds; 1461 1462 ka.lwp = curthread->td_lwp; 1463 ka.nfds = nfds; 1464 ka.pfds = 0; 1465 ka.error = 0; 1466 1467 if (ka.nfds < 64) 1468 ka.fds = sfds; 1469 else 1470 ka.fds = kmalloc(bytes, M_SELECT, M_WAITOK); 1471 1472 error = copyin(fds, ka.fds, bytes); 1473 if (error == 0) 1474 error = kern_kevent(&ka.lwp->lwp_kqueue, 0x7FFFFFFF, res, &ka, 1475 poll_copyin, poll_copyout, ts); 1476 1477 if (error == 0) 1478 error = copyout(ka.fds, fds, bytes); 1479 1480 if (ka.fds != sfds) 1481 kfree(ka.fds, M_SELECT); 1482 1483 ka.lwp->lwp_kqueue_serial += nfds; 1484 1485 return (error); 1486 } 1487 1488 static int 1489 socket_wait_copyin(void *arg, struct kevent *kevp, int maxevents, int *events) 1490 { 1491 return (0); 1492 } 1493 1494 static int 1495 socket_wait_copyout(void *arg, struct kevent *kevp, int count, int *res) 1496 { 1497 ++*res; 1498 return (0); 1499 } 1500 1501 extern struct fileops socketops; 1502 1503 /* 1504 * NOTE: Callers of socket_wait() must already have a reference on the 1505 * socket. 1506 */ 1507 int 1508 socket_wait(struct socket *so, struct timespec *ts, int *res) 1509 { 1510 struct thread *td = curthread; 1511 struct file *fp; 1512 struct kqueue kq; 1513 struct kevent kev; 1514 int error, fd; 1515 1516 if ((error = falloc(td->td_lwp, &fp, &fd)) != 0) 1517 return (error); 1518 1519 fp->f_type = DTYPE_SOCKET; 1520 fp->f_flag = FREAD | FWRITE; 1521 fp->f_ops = &socketops; 1522 fp->f_data = so; 1523 fsetfd(td->td_lwp->lwp_proc->p_fd, fp, fd); 1524 1525 kqueue_init(&kq, td->td_lwp->lwp_proc->p_fd); 1526 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, NULL); 1527 if ((error = kqueue_register(&kq, &kev)) != 0) { 1528 fdrop(fp); 1529 return (error); 1530 } 1531 1532 error = kern_kevent(&kq, 1, res, NULL, socket_wait_copyin, 1533 socket_wait_copyout, ts); 1534 1535 EV_SET(&kev, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL); 1536 kqueue_register(&kq, &kev); 1537 fp->f_ops = &badfileops; 1538 fdrop(fp); 1539 1540 return (error); 1541 } 1542 1543 /* 1544 * OpenBSD poll system call. 1545 * XXX this isn't quite a true representation.. OpenBSD uses select ops. 1546 * 1547 * MPSAFE 1548 */ 1549 int 1550 sys_openbsd_poll(struct openbsd_poll_args *uap) 1551 { 1552 return (sys_poll((struct poll_args *)uap)); 1553 } 1554 1555 /*ARGSUSED*/ 1556 int 1557 seltrue(cdev_t dev, int events) 1558 { 1559 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 1560 } 1561