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