| 1 | /* $NetBSD: sys_descrip.c,v 1.30 2014/09/05 09:20:59 matt Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Copyright (c) 1982, 1986, 1989, 1991, 1993 |
| 31 | * The Regents of the University of California. All rights reserved. |
| 32 | * (c) UNIX System Laboratories, Inc. |
| 33 | * All or some portions of this file are derived from material licensed |
| 34 | * to the University of California by American Telephone and Telegraph |
| 35 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 36 | * the permission of UNIX System Laboratories, Inc. |
| 37 | * |
| 38 | * Redistribution and use in source and binary forms, with or without |
| 39 | * modification, are permitted provided that the following conditions |
| 40 | * are met: |
| 41 | * 1. Redistributions of source code must retain the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer. |
| 43 | * 2. Redistributions in binary form must reproduce the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer in the |
| 45 | * documentation and/or other materials provided with the distribution. |
| 46 | * 3. Neither the name of the University nor the names of its contributors |
| 47 | * may be used to endorse or promote products derived from this software |
| 48 | * without specific prior written permission. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 51 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 52 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 53 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 54 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 55 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 56 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 57 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 58 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 59 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 60 | * SUCH DAMAGE. |
| 61 | * |
| 62 | * @(#)kern_descrip.c 8.8 (Berkeley) 2/14/95 |
| 63 | */ |
| 64 | |
| 65 | /* |
| 66 | * System calls on descriptors. |
| 67 | */ |
| 68 | |
| 69 | #include <sys/cdefs.h> |
| 70 | __KERNEL_RCSID(0, "$NetBSD: sys_descrip.c,v 1.30 2014/09/05 09:20:59 matt Exp $" ); |
| 71 | |
| 72 | #include <sys/param.h> |
| 73 | #include <sys/systm.h> |
| 74 | #include <sys/filedesc.h> |
| 75 | #include <sys/kernel.h> |
| 76 | #include <sys/vnode.h> |
| 77 | #include <sys/proc.h> |
| 78 | #include <sys/file.h> |
| 79 | #include <sys/namei.h> |
| 80 | #include <sys/socket.h> |
| 81 | #include <sys/socketvar.h> |
| 82 | #include <sys/stat.h> |
| 83 | #include <sys/ioctl.h> |
| 84 | #include <sys/fcntl.h> |
| 85 | #include <sys/kmem.h> |
| 86 | #include <sys/pool.h> |
| 87 | #include <sys/syslog.h> |
| 88 | #include <sys/unistd.h> |
| 89 | #include <sys/resourcevar.h> |
| 90 | #include <sys/conf.h> |
| 91 | #include <sys/event.h> |
| 92 | #include <sys/kauth.h> |
| 93 | #include <sys/atomic.h> |
| 94 | #include <sys/mount.h> |
| 95 | #include <sys/syscallargs.h> |
| 96 | |
| 97 | #include <uvm/uvm_readahead.h> |
| 98 | |
| 99 | /* |
| 100 | * Duplicate a file descriptor. |
| 101 | */ |
| 102 | int |
| 103 | sys_dup(struct lwp *l, const struct sys_dup_args *uap, register_t *retval) |
| 104 | { |
| 105 | /* { |
| 106 | syscallarg(int) fd; |
| 107 | } */ |
| 108 | int error, newfd, oldfd; |
| 109 | file_t *fp; |
| 110 | |
| 111 | oldfd = SCARG(uap, fd); |
| 112 | |
| 113 | if ((fp = fd_getfile(oldfd)) == NULL) { |
| 114 | return EBADF; |
| 115 | } |
| 116 | error = fd_dup(fp, 0, &newfd, false); |
| 117 | fd_putfile(oldfd); |
| 118 | *retval = newfd; |
| 119 | return error; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Duplicate a file descriptor to a particular value. |
| 124 | */ |
| 125 | int |
| 126 | dodup(struct lwp *l, int from, int to, int flags, register_t *retval) |
| 127 | { |
| 128 | int error; |
| 129 | file_t *fp; |
| 130 | |
| 131 | if ((fp = fd_getfile(from)) == NULL) |
| 132 | return EBADF; |
| 133 | mutex_enter(&fp->f_lock); |
| 134 | fp->f_count++; |
| 135 | mutex_exit(&fp->f_lock); |
| 136 | fd_putfile(from); |
| 137 | |
| 138 | if ((u_int)to >= curproc->p_rlimit[RLIMIT_NOFILE].rlim_cur || |
| 139 | (u_int)to >= maxfiles) |
| 140 | error = EBADF; |
| 141 | else if (from == to) |
| 142 | error = 0; |
| 143 | else |
| 144 | error = fd_dup2(fp, to, flags); |
| 145 | closef(fp); |
| 146 | *retval = to; |
| 147 | |
| 148 | return error; |
| 149 | } |
| 150 | |
| 151 | int |
| 152 | sys_dup3(struct lwp *l, const struct sys_dup3_args *uap, register_t *retval) |
| 153 | { |
| 154 | /* { |
| 155 | syscallarg(int) from; |
| 156 | syscallarg(int) to; |
| 157 | syscallarg(int) flags; |
| 158 | } */ |
| 159 | return dodup(l, SCARG(uap, from), SCARG(uap, to), SCARG(uap, flags), |
| 160 | retval); |
| 161 | } |
| 162 | |
| 163 | int |
| 164 | sys_dup2(struct lwp *l, const struct sys_dup2_args *uap, register_t *retval) |
| 165 | { |
| 166 | /* { |
| 167 | syscallarg(int) from; |
| 168 | syscallarg(int) to; |
| 169 | } */ |
| 170 | return dodup(l, SCARG(uap, from), SCARG(uap, to), 0, retval); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * fcntl call which is being passed to the file's fs. |
| 175 | */ |
| 176 | static int |
| 177 | fcntl_forfs(int fd, file_t *fp, int cmd, void *arg) |
| 178 | { |
| 179 | int error; |
| 180 | u_int size; |
| 181 | void *data, *memp; |
| 182 | #define STK_PARAMS 128 |
| 183 | char stkbuf[STK_PARAMS]; |
| 184 | |
| 185 | if ((fp->f_flag & (FREAD | FWRITE)) == 0) |
| 186 | return (EBADF); |
| 187 | |
| 188 | /* |
| 189 | * Interpret high order word to find amount of data to be |
| 190 | * copied to/from the user's address space. |
| 191 | */ |
| 192 | size = (size_t)F_PARAM_LEN(cmd); |
| 193 | if (size > F_PARAM_MAX) |
| 194 | return (EINVAL); |
| 195 | memp = NULL; |
| 196 | if (size > sizeof(stkbuf)) { |
| 197 | memp = kmem_alloc(size, KM_SLEEP); |
| 198 | data = memp; |
| 199 | } else |
| 200 | data = stkbuf; |
| 201 | if (cmd & F_FSIN) { |
| 202 | if (size) { |
| 203 | error = copyin(arg, data, size); |
| 204 | if (error) { |
| 205 | if (memp) |
| 206 | kmem_free(memp, size); |
| 207 | return (error); |
| 208 | } |
| 209 | } else |
| 210 | *(void **)data = arg; |
| 211 | } else if ((cmd & F_FSOUT) != 0 && size != 0) { |
| 212 | /* |
| 213 | * Zero the buffer so the user always |
| 214 | * gets back something deterministic. |
| 215 | */ |
| 216 | memset(data, 0, size); |
| 217 | } else if (cmd & F_FSVOID) |
| 218 | *(void **)data = arg; |
| 219 | |
| 220 | |
| 221 | error = (*fp->f_ops->fo_fcntl)(fp, cmd, data); |
| 222 | |
| 223 | /* |
| 224 | * Copy any data to user, size was |
| 225 | * already set and checked above. |
| 226 | */ |
| 227 | if (error == 0 && (cmd & F_FSOUT) && size) |
| 228 | error = copyout(data, arg, size); |
| 229 | if (memp) |
| 230 | kmem_free(memp, size); |
| 231 | return (error); |
| 232 | } |
| 233 | |
| 234 | int |
| 235 | do_fcntl_lock(int fd, int cmd, struct flock *fl) |
| 236 | { |
| 237 | file_t *fp; |
| 238 | vnode_t *vp; |
| 239 | proc_t *p; |
| 240 | int error, flg; |
| 241 | |
| 242 | if ((fp = fd_getfile(fd)) == NULL) |
| 243 | return EBADF; |
| 244 | if (fp->f_type != DTYPE_VNODE) { |
| 245 | fd_putfile(fd); |
| 246 | return EINVAL; |
| 247 | } |
| 248 | vp = fp->f_vnode; |
| 249 | if (fl->l_whence == SEEK_CUR) |
| 250 | fl->l_start += fp->f_offset; |
| 251 | |
| 252 | flg = F_POSIX; |
| 253 | p = curproc; |
| 254 | |
| 255 | switch (cmd) { |
| 256 | case F_SETLKW: |
| 257 | flg |= F_WAIT; |
| 258 | /* Fall into F_SETLK */ |
| 259 | |
| 260 | case F_SETLK: |
| 261 | switch (fl->l_type) { |
| 262 | case F_RDLCK: |
| 263 | if ((fp->f_flag & FREAD) == 0) { |
| 264 | error = EBADF; |
| 265 | break; |
| 266 | } |
| 267 | if ((p->p_flag & PK_ADVLOCK) == 0) { |
| 268 | mutex_enter(p->p_lock); |
| 269 | p->p_flag |= PK_ADVLOCK; |
| 270 | mutex_exit(p->p_lock); |
| 271 | } |
| 272 | error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); |
| 273 | break; |
| 274 | |
| 275 | case F_WRLCK: |
| 276 | if ((fp->f_flag & FWRITE) == 0) { |
| 277 | error = EBADF; |
| 278 | break; |
| 279 | } |
| 280 | if ((p->p_flag & PK_ADVLOCK) == 0) { |
| 281 | mutex_enter(p->p_lock); |
| 282 | p->p_flag |= PK_ADVLOCK; |
| 283 | mutex_exit(p->p_lock); |
| 284 | } |
| 285 | error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); |
| 286 | break; |
| 287 | |
| 288 | case F_UNLCK: |
| 289 | error = VOP_ADVLOCK(vp, p, F_UNLCK, fl, F_POSIX); |
| 290 | break; |
| 291 | |
| 292 | default: |
| 293 | error = EINVAL; |
| 294 | break; |
| 295 | } |
| 296 | break; |
| 297 | |
| 298 | case F_GETLK: |
| 299 | if (fl->l_type != F_RDLCK && |
| 300 | fl->l_type != F_WRLCK && |
| 301 | fl->l_type != F_UNLCK) { |
| 302 | error = EINVAL; |
| 303 | break; |
| 304 | } |
| 305 | error = VOP_ADVLOCK(vp, p, F_GETLK, fl, F_POSIX); |
| 306 | break; |
| 307 | |
| 308 | default: |
| 309 | error = EINVAL; |
| 310 | break; |
| 311 | } |
| 312 | |
| 313 | fd_putfile(fd); |
| 314 | return error; |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * The file control system call. |
| 319 | */ |
| 320 | int |
| 321 | sys_fcntl(struct lwp *l, const struct sys_fcntl_args *uap, register_t *retval) |
| 322 | { |
| 323 | /* { |
| 324 | syscallarg(int) fd; |
| 325 | syscallarg(int) cmd; |
| 326 | syscallarg(void *) arg; |
| 327 | } */ |
| 328 | int fd, i, tmp, error, cmd, newmin; |
| 329 | filedesc_t *fdp; |
| 330 | file_t *fp; |
| 331 | struct flock fl; |
| 332 | bool cloexec = false; |
| 333 | |
| 334 | fd = SCARG(uap, fd); |
| 335 | cmd = SCARG(uap, cmd); |
| 336 | fdp = l->l_fd; |
| 337 | error = 0; |
| 338 | |
| 339 | switch (cmd) { |
| 340 | case F_CLOSEM: |
| 341 | if (fd < 0) |
| 342 | return EBADF; |
| 343 | while ((i = fdp->fd_lastfile) >= fd) { |
| 344 | if (fd_getfile(i) == NULL) { |
| 345 | /* Another thread has updated. */ |
| 346 | continue; |
| 347 | } |
| 348 | fd_close(i); |
| 349 | } |
| 350 | return 0; |
| 351 | |
| 352 | case F_MAXFD: |
| 353 | *retval = fdp->fd_lastfile; |
| 354 | return 0; |
| 355 | |
| 356 | case F_SETLKW: |
| 357 | case F_SETLK: |
| 358 | case F_GETLK: |
| 359 | error = copyin(SCARG(uap, arg), &fl, sizeof(fl)); |
| 360 | if (error) |
| 361 | return error; |
| 362 | error = do_fcntl_lock(fd, cmd, &fl); |
| 363 | if (cmd == F_GETLK && error == 0) |
| 364 | error = copyout(&fl, SCARG(uap, arg), sizeof(fl)); |
| 365 | return error; |
| 366 | |
| 367 | default: |
| 368 | /* Handled below */ |
| 369 | break; |
| 370 | } |
| 371 | |
| 372 | if ((fp = fd_getfile(fd)) == NULL) |
| 373 | return (EBADF); |
| 374 | |
| 375 | if ((cmd & F_FSCTL)) { |
| 376 | error = fcntl_forfs(fd, fp, cmd, SCARG(uap, arg)); |
| 377 | fd_putfile(fd); |
| 378 | return error; |
| 379 | } |
| 380 | |
| 381 | switch (cmd) { |
| 382 | case F_DUPFD_CLOEXEC: |
| 383 | cloexec = true; |
| 384 | /*FALLTHROUGH*/ |
| 385 | case F_DUPFD: |
| 386 | newmin = (long)SCARG(uap, arg); |
| 387 | if ((u_int)newmin >= |
| 388 | l->l_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur || |
| 389 | (u_int)newmin >= maxfiles) { |
| 390 | fd_putfile(fd); |
| 391 | return EINVAL; |
| 392 | } |
| 393 | error = fd_dup(fp, newmin, &i, cloexec); |
| 394 | *retval = i; |
| 395 | break; |
| 396 | |
| 397 | case F_GETFD: |
| 398 | *retval = fdp->fd_dt->dt_ff[fd]->ff_exclose; |
| 399 | break; |
| 400 | |
| 401 | case F_SETFD: |
| 402 | fd_set_exclose(l, fd, |
| 403 | ((long)SCARG(uap, arg) & FD_CLOEXEC) != 0); |
| 404 | break; |
| 405 | |
| 406 | case F_GETNOSIGPIPE: |
| 407 | *retval = (fp->f_flag & FNOSIGPIPE) != 0; |
| 408 | break; |
| 409 | |
| 410 | case F_SETNOSIGPIPE: |
| 411 | if (SCARG(uap, arg)) |
| 412 | atomic_or_uint(&fp->f_flag, FNOSIGPIPE); |
| 413 | else |
| 414 | atomic_and_uint(&fp->f_flag, ~FNOSIGPIPE); |
| 415 | *retval = 0; |
| 416 | break; |
| 417 | |
| 418 | case F_GETFL: |
| 419 | *retval = OFLAGS(fp->f_flag); |
| 420 | break; |
| 421 | |
| 422 | case F_SETFL: |
| 423 | /* XXX not guaranteed to be atomic. */ |
| 424 | tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS; |
| 425 | error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, &tmp); |
| 426 | if (error) |
| 427 | break; |
| 428 | i = tmp ^ fp->f_flag; |
| 429 | if (i & FNONBLOCK) { |
| 430 | int flgs = tmp & FNONBLOCK; |
| 431 | error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, &flgs); |
| 432 | if (error) { |
| 433 | (*fp->f_ops->fo_fcntl)(fp, F_SETFL, |
| 434 | &fp->f_flag); |
| 435 | break; |
| 436 | } |
| 437 | } |
| 438 | if (i & FASYNC) { |
| 439 | int flgs = tmp & FASYNC; |
| 440 | error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, &flgs); |
| 441 | if (error) { |
| 442 | if (i & FNONBLOCK) { |
| 443 | tmp = fp->f_flag & FNONBLOCK; |
| 444 | (void)(*fp->f_ops->fo_ioctl)(fp, |
| 445 | FIONBIO, &tmp); |
| 446 | } |
| 447 | (*fp->f_ops->fo_fcntl)(fp, F_SETFL, |
| 448 | &fp->f_flag); |
| 449 | break; |
| 450 | } |
| 451 | } |
| 452 | fp->f_flag = (fp->f_flag & ~FCNTLFLAGS) | tmp; |
| 453 | break; |
| 454 | |
| 455 | case F_GETOWN: |
| 456 | error = (*fp->f_ops->fo_ioctl)(fp, FIOGETOWN, &tmp); |
| 457 | *retval = tmp; |
| 458 | break; |
| 459 | |
| 460 | case F_SETOWN: |
| 461 | tmp = (int)(uintptr_t) SCARG(uap, arg); |
| 462 | error = (*fp->f_ops->fo_ioctl)(fp, FIOSETOWN, &tmp); |
| 463 | break; |
| 464 | |
| 465 | default: |
| 466 | error = EINVAL; |
| 467 | } |
| 468 | |
| 469 | fd_putfile(fd); |
| 470 | return (error); |
| 471 | } |
| 472 | |
| 473 | /* |
| 474 | * Close a file descriptor. |
| 475 | */ |
| 476 | int |
| 477 | sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval) |
| 478 | { |
| 479 | /* { |
| 480 | syscallarg(int) fd; |
| 481 | } */ |
| 482 | int error; |
| 483 | |
| 484 | if (fd_getfile(SCARG(uap, fd)) == NULL) { |
| 485 | return EBADF; |
| 486 | } |
| 487 | |
| 488 | error = fd_close(SCARG(uap, fd)); |
| 489 | if (error == ERESTART) { |
| 490 | #ifdef DIAGNOSTIC |
| 491 | printf("pid %d: close returned ERESTART\n" , |
| 492 | (int)l->l_proc->p_pid); |
| 493 | #endif |
| 494 | error = EINTR; |
| 495 | } |
| 496 | |
| 497 | return error; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * Return status information about a file descriptor. |
| 502 | * Common function for compat code. |
| 503 | */ |
| 504 | int |
| 505 | do_sys_fstat(int fd, struct stat *sb) |
| 506 | { |
| 507 | file_t *fp; |
| 508 | int error; |
| 509 | |
| 510 | if ((fp = fd_getfile(fd)) == NULL) { |
| 511 | return EBADF; |
| 512 | } |
| 513 | error = (*fp->f_ops->fo_stat)(fp, sb); |
| 514 | fd_putfile(fd); |
| 515 | |
| 516 | return error; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Return status information about a file descriptor. |
| 521 | */ |
| 522 | int |
| 523 | sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, |
| 524 | register_t *retval) |
| 525 | { |
| 526 | /* { |
| 527 | syscallarg(int) fd; |
| 528 | syscallarg(struct stat *) sb; |
| 529 | } */ |
| 530 | struct stat sb; |
| 531 | int error; |
| 532 | |
| 533 | error = do_sys_fstat(SCARG(uap, fd), &sb); |
| 534 | if (error == 0) { |
| 535 | error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); |
| 536 | } |
| 537 | return error; |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Return pathconf information about a file descriptor. |
| 542 | */ |
| 543 | int |
| 544 | sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, |
| 545 | register_t *retval) |
| 546 | { |
| 547 | /* { |
| 548 | syscallarg(int) fd; |
| 549 | syscallarg(int) name; |
| 550 | } */ |
| 551 | int fd, error; |
| 552 | file_t *fp; |
| 553 | |
| 554 | fd = SCARG(uap, fd); |
| 555 | error = 0; |
| 556 | |
| 557 | if ((fp = fd_getfile(fd)) == NULL) { |
| 558 | return (EBADF); |
| 559 | } |
| 560 | switch (fp->f_type) { |
| 561 | case DTYPE_SOCKET: |
| 562 | case DTYPE_PIPE: |
| 563 | if (SCARG(uap, name) != _PC_PIPE_BUF) |
| 564 | error = EINVAL; |
| 565 | else |
| 566 | *retval = PIPE_BUF; |
| 567 | break; |
| 568 | |
| 569 | case DTYPE_VNODE: |
| 570 | error = VOP_PATHCONF(fp->f_vnode, SCARG(uap, name), retval); |
| 571 | break; |
| 572 | |
| 573 | case DTYPE_KQUEUE: |
| 574 | error = EINVAL; |
| 575 | break; |
| 576 | |
| 577 | default: |
| 578 | error = EOPNOTSUPP; |
| 579 | break; |
| 580 | } |
| 581 | |
| 582 | fd_putfile(fd); |
| 583 | return (error); |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Apply an advisory lock on a file descriptor. |
| 588 | * |
| 589 | * Just attempt to get a record lock of the requested type on |
| 590 | * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). |
| 591 | */ |
| 592 | /* ARGSUSED */ |
| 593 | int |
| 594 | sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) |
| 595 | { |
| 596 | /* { |
| 597 | syscallarg(int) fd; |
| 598 | syscallarg(int) how; |
| 599 | } */ |
| 600 | int fd, how, error; |
| 601 | file_t *fp; |
| 602 | vnode_t *vp; |
| 603 | struct flock lf; |
| 604 | |
| 605 | fd = SCARG(uap, fd); |
| 606 | how = SCARG(uap, how); |
| 607 | error = 0; |
| 608 | |
| 609 | if ((fp = fd_getfile(fd)) == NULL) { |
| 610 | return EBADF; |
| 611 | } |
| 612 | if (fp->f_type != DTYPE_VNODE) { |
| 613 | fd_putfile(fd); |
| 614 | return EOPNOTSUPP; |
| 615 | } |
| 616 | |
| 617 | vp = fp->f_vnode; |
| 618 | lf.l_whence = SEEK_SET; |
| 619 | lf.l_start = 0; |
| 620 | lf.l_len = 0; |
| 621 | |
| 622 | switch (how & ~LOCK_NB) { |
| 623 | case LOCK_UN: |
| 624 | lf.l_type = F_UNLCK; |
| 625 | atomic_and_uint(&fp->f_flag, ~FHASLOCK); |
| 626 | error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); |
| 627 | fd_putfile(fd); |
| 628 | return error; |
| 629 | case LOCK_EX: |
| 630 | lf.l_type = F_WRLCK; |
| 631 | break; |
| 632 | case LOCK_SH: |
| 633 | lf.l_type = F_RDLCK; |
| 634 | break; |
| 635 | default: |
| 636 | fd_putfile(fd); |
| 637 | return EINVAL; |
| 638 | } |
| 639 | |
| 640 | atomic_or_uint(&fp->f_flag, FHASLOCK); |
| 641 | if (how & LOCK_NB) { |
| 642 | error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK); |
| 643 | } else { |
| 644 | error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); |
| 645 | } |
| 646 | fd_putfile(fd); |
| 647 | return error; |
| 648 | } |
| 649 | |
| 650 | int |
| 651 | do_posix_fadvise(int fd, off_t offset, off_t len, int advice) |
| 652 | { |
| 653 | file_t *fp; |
| 654 | vnode_t *vp; |
| 655 | off_t endoffset; |
| 656 | int error; |
| 657 | |
| 658 | CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL); |
| 659 | CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM); |
| 660 | CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL); |
| 661 | |
| 662 | if (len == 0) { |
| 663 | endoffset = INT64_MAX; |
| 664 | } else if (len > 0 && (INT64_MAX - offset) >= len) { |
| 665 | endoffset = offset + len; |
| 666 | } else { |
| 667 | return EINVAL; |
| 668 | } |
| 669 | if ((fp = fd_getfile(fd)) == NULL) { |
| 670 | return EBADF; |
| 671 | } |
| 672 | if (fp->f_type != DTYPE_VNODE) { |
| 673 | if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) { |
| 674 | error = ESPIPE; |
| 675 | } else { |
| 676 | error = EOPNOTSUPP; |
| 677 | } |
| 678 | fd_putfile(fd); |
| 679 | return error; |
| 680 | } |
| 681 | |
| 682 | switch (advice) { |
| 683 | case POSIX_FADV_WILLNEED: |
| 684 | case POSIX_FADV_DONTNEED: |
| 685 | vp = fp->f_vnode; |
| 686 | if (vp->v_type != VREG && vp->v_type != VBLK) { |
| 687 | fd_putfile(fd); |
| 688 | return 0; |
| 689 | } |
| 690 | break; |
| 691 | } |
| 692 | |
| 693 | switch (advice) { |
| 694 | case POSIX_FADV_NORMAL: |
| 695 | case POSIX_FADV_RANDOM: |
| 696 | case POSIX_FADV_SEQUENTIAL: |
| 697 | /* |
| 698 | * We ignore offset and size. Must lock the file to |
| 699 | * do this, as f_advice is sub-word sized. |
| 700 | */ |
| 701 | mutex_enter(&fp->f_lock); |
| 702 | fp->f_advice = (u_char)advice; |
| 703 | mutex_exit(&fp->f_lock); |
| 704 | error = 0; |
| 705 | break; |
| 706 | |
| 707 | case POSIX_FADV_WILLNEED: |
| 708 | vp = fp->f_vnode; |
| 709 | error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset); |
| 710 | break; |
| 711 | |
| 712 | case POSIX_FADV_DONTNEED: |
| 713 | vp = fp->f_vnode; |
| 714 | /* |
| 715 | * Align the region to page boundaries as VOP_PUTPAGES expects |
| 716 | * by shrinking it. We shrink instead of expand because we |
| 717 | * do not want to deactivate cache outside of the requested |
| 718 | * region. It means that if the specified region is smaller |
| 719 | * than PAGE_SIZE, we do nothing. |
| 720 | */ |
| 721 | if (round_page(offset) < trunc_page(endoffset) && |
| 722 | offset <= round_page(offset)) { |
| 723 | mutex_enter(vp->v_interlock); |
| 724 | error = VOP_PUTPAGES(vp, |
| 725 | round_page(offset), trunc_page(endoffset), |
| 726 | PGO_DEACTIVATE | PGO_CLEANIT); |
| 727 | } else { |
| 728 | error = 0; |
| 729 | } |
| 730 | break; |
| 731 | |
| 732 | case POSIX_FADV_NOREUSE: |
| 733 | /* Not implemented yet. */ |
| 734 | error = 0; |
| 735 | break; |
| 736 | default: |
| 737 | error = EINVAL; |
| 738 | break; |
| 739 | } |
| 740 | |
| 741 | fd_putfile(fd); |
| 742 | return error; |
| 743 | } |
| 744 | |
| 745 | int |
| 746 | sys___posix_fadvise50(struct lwp *l, |
| 747 | const struct sys___posix_fadvise50_args *uap, |
| 748 | register_t *retval) |
| 749 | { |
| 750 | /* { |
| 751 | syscallarg(int) fd; |
| 752 | syscallarg(int) pad; |
| 753 | syscallarg(off_t) offset; |
| 754 | syscallarg(off_t) len; |
| 755 | syscallarg(int) advice; |
| 756 | } */ |
| 757 | |
| 758 | *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), |
| 759 | SCARG(uap, len), SCARG(uap, advice)); |
| 760 | |
| 761 | return 0; |
| 762 | } |
| 763 | |
| 764 | int |
| 765 | sys_pipe(struct lwp *l, const void *v, register_t *retval) |
| 766 | { |
| 767 | return pipe1(l, retval, 0); |
| 768 | } |
| 769 | |
| 770 | int |
| 771 | sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) |
| 772 | { |
| 773 | /* { |
| 774 | syscallarg(int[2]) fildes; |
| 775 | syscallarg(int) flags; |
| 776 | } */ |
| 777 | int fd[2], error; |
| 778 | |
| 779 | if ((error = pipe1(l, retval, SCARG(uap, flags))) != 0) |
| 780 | return error; |
| 781 | fd[0] = retval[0]; |
| 782 | fd[1] = retval[1]; |
| 783 | if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) |
| 784 | return error; |
| 785 | retval[0] = 0; |
| 786 | return 0; |
| 787 | } |
| 788 | |