sys_descrip.c revision 1.54
1 /* $NetBSD: sys_descrip.c,v 1.54 2026/01/04 01:32:23 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2020 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 1.54 2026/01/04 01:32:23 riastradh Exp $"); 71 72 #include <sys/param.h> 73 #include <sys/types.h> 74 75 #include <sys/atomic.h> 76 #include <sys/conf.h> 77 #include <sys/event.h> 78 #include <sys/fcntl.h> 79 #include <sys/file.h> 80 #include <sys/filedesc.h> 81 #include <sys/ioctl.h> 82 #include <sys/kauth.h> 83 #include <sys/kernel.h> 84 #include <sys/kmem.h> 85 #include <sys/mount.h> 86 #include <sys/namei.h> 87 #include <sys/pool.h> 88 #include <sys/proc.h> 89 #include <sys/resourcevar.h> 90 #include <sys/sdt.h> 91 #include <sys/socket.h> 92 #include <sys/socketvar.h> 93 #include <sys/stat.h> 94 #include <sys/syscallargs.h> 95 #include <sys/syslog.h> 96 #include <sys/systm.h> 97 #include <sys/unistd.h> 98 #include <sys/vnode.h> 99 100 #include <uvm/uvm_readahead.h> 101 102 /* 103 * Duplicate a file descriptor. 104 */ 105 int 106 sys_dup(struct lwp *l, const struct sys_dup_args *uap, register_t *retval) 107 { 108 /* { 109 syscallarg(int) fd; 110 } */ 111 int error, newfd, oldfd; 112 file_t *fp; 113 114 oldfd = SCARG(uap, fd); 115 116 if ((fp = fd_getfile(oldfd)) == NULL) { 117 return SET_ERROR(EBADF); 118 } 119 error = fd_dup(fp, 0, &newfd, false, false); 120 fd_putfile(oldfd); 121 *retval = newfd; 122 return error; 123 } 124 125 /* 126 * Duplicate a file descriptor to a particular value. 127 */ 128 int 129 dodup(struct lwp *l, int from, int to, int flags, register_t *retval) 130 { 131 int error; 132 file_t *fp; 133 134 if ((fp = fd_getfile(from)) == NULL) 135 return SET_ERROR(EBADF); 136 mutex_enter(&fp->f_lock); 137 fp->f_count++; 138 mutex_exit(&fp->f_lock); 139 fd_putfile(from); 140 141 if ((u_int)to >= curproc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 142 (u_int)to >= maxfiles) 143 error = SET_ERROR(EBADF); 144 else if (from == to) 145 error = 0; 146 else 147 error = fd_dup2(fp, to, flags); 148 closef(fp); 149 *retval = to; 150 151 return error; 152 } 153 154 int 155 sys___dup3100(struct lwp *l, const struct sys___dup3100_args *uap, register_t *retval) 156 { 157 /* { 158 syscallarg(int) from; 159 syscallarg(int) to; 160 syscallarg(int) flags; 161 } */ 162 if (SCARG(uap, from) == SCARG(uap, to)) 163 return SET_ERROR(EINVAL); 164 return dodup(l, SCARG(uap, from), SCARG(uap, to), SCARG(uap, flags), 165 retval); 166 } 167 168 int 169 sys_dup2(struct lwp *l, const struct sys_dup2_args *uap, register_t *retval) 170 { 171 /* { 172 syscallarg(int) from; 173 syscallarg(int) to; 174 } */ 175 return dodup(l, SCARG(uap, from), SCARG(uap, to), 0, retval); 176 } 177 178 /* 179 * fcntl call which is being passed to the file's fs. 180 */ 181 static int 182 fcntl_forfs(int fd, file_t *fp, int cmd, void *arg) 183 { 184 int error; 185 u_int size; 186 void *data, *memp; 187 #define STK_PARAMS 128 188 char stkbuf[STK_PARAMS]; 189 190 if ((fp->f_flag & (FREAD | FWRITE)) == 0) 191 return SET_ERROR(EBADF); 192 193 /* 194 * Interpret high order word to find amount of data to be 195 * copied to/from the user's address space. 196 */ 197 size = (size_t)F_PARAM_LEN(cmd); 198 if (size > F_PARAM_MAX) 199 return SET_ERROR(EINVAL); 200 memp = NULL; 201 if (size > sizeof(stkbuf)) { 202 memp = kmem_alloc(size, KM_SLEEP); 203 data = memp; 204 } else 205 data = stkbuf; 206 if (cmd & F_FSIN) { 207 if (size) { 208 error = copyin(arg, data, size); 209 if (error) { 210 if (memp) 211 kmem_free(memp, size); 212 return (error); 213 } 214 } else 215 *(void **)data = arg; 216 } else if ((cmd & F_FSOUT) != 0 && size != 0) { 217 /* 218 * Zero the buffer so the user always 219 * gets back something deterministic. 220 */ 221 memset(data, 0, size); 222 } else if (cmd & F_FSVOID) 223 *(void **)data = arg; 224 225 226 error = (*fp->f_ops->fo_fcntl)(fp, cmd, data); 227 228 /* 229 * Copy any data to user, size was 230 * already set and checked above. 231 */ 232 if (error == 0 && (cmd & F_FSOUT) && size) 233 error = copyout(data, arg, size); 234 if (memp) 235 kmem_free(memp, size); 236 return (error); 237 } 238 239 int 240 do_fcntl_lock(int fd, int cmd, struct flock *fl) 241 { 242 struct file *fp = NULL; 243 proc_t *p; 244 int (*fo_advlock)(struct file *, void *, int, struct flock *, int); 245 int error, flg; 246 247 if ((fp = fd_getfile(fd)) == NULL) { 248 error = SET_ERROR(EBADF); 249 goto out; 250 } 251 if ((fo_advlock = fp->f_ops->fo_advlock) == NULL) { 252 error = SET_ERROR(EINVAL); 253 goto out; 254 } 255 256 flg = F_POSIX; 257 p = curproc; 258 259 switch (cmd) { 260 case F_SETLKW: 261 flg |= F_WAIT; 262 /* Fall into F_SETLK */ 263 264 /* FALLTHROUGH */ 265 case F_SETLK: 266 switch (fl->l_type) { 267 case F_RDLCK: 268 if ((fp->f_flag & FREAD) == 0) { 269 error = SET_ERROR(EBADF); 270 break; 271 } 272 if ((p->p_flag & PK_ADVLOCK) == 0) { 273 mutex_enter(p->p_lock); 274 p->p_flag |= PK_ADVLOCK; 275 mutex_exit(p->p_lock); 276 } 277 error = (*fo_advlock)(fp, p, F_SETLK, fl, flg); 278 break; 279 280 case F_WRLCK: 281 if ((fp->f_flag & FWRITE) == 0) { 282 error = SET_ERROR(EBADF); 283 break; 284 } 285 if ((p->p_flag & PK_ADVLOCK) == 0) { 286 mutex_enter(p->p_lock); 287 p->p_flag |= PK_ADVLOCK; 288 mutex_exit(p->p_lock); 289 } 290 error = (*fo_advlock)(fp, p, F_SETLK, fl, flg); 291 break; 292 293 case F_UNLCK: 294 error = (*fo_advlock)(fp, p, F_UNLCK, fl, F_POSIX); 295 break; 296 297 default: 298 error = SET_ERROR(EINVAL); 299 break; 300 } 301 break; 302 303 case F_GETLK: 304 if (fl->l_type != F_RDLCK && 305 fl->l_type != F_WRLCK && 306 fl->l_type != F_UNLCK) { 307 error = SET_ERROR(EINVAL); 308 break; 309 } 310 error = (*fo_advlock)(fp, p, F_GETLK, fl, F_POSIX); 311 break; 312 313 default: 314 error = SET_ERROR(EINVAL); 315 break; 316 } 317 318 out: if (fp) 319 fd_putfile(fd); 320 return error; 321 } 322 323 /* 324 * The file control system call. 325 */ 326 int 327 sys_fcntl(struct lwp *l, const struct sys_fcntl_args *uap, register_t *retval) 328 { 329 /* { 330 syscallarg(int) fd; 331 syscallarg(int) cmd; 332 syscallarg(void *) arg; 333 } */ 334 int fd, i, tmp, error, cmd, newmin; 335 filedesc_t *fdp; 336 fdtab_t *dt; 337 file_t *fp; 338 char *kpath; 339 struct flock fl; 340 bool cloexec = false; 341 bool clofork = false; 342 343 fd = SCARG(uap, fd); 344 cmd = SCARG(uap, cmd); 345 fdp = l->l_fd; 346 error = 0; 347 348 switch (cmd) { 349 case F_CLOSEM: 350 if (fd < 0) 351 return SET_ERROR(EBADF); 352 while ((i = fdp->fd_lastfile) >= fd) { 353 if (fd_getfile(i) == NULL) { 354 /* Another thread has updated. */ 355 continue; 356 } 357 fd_close(i); 358 } 359 return 0; 360 361 case F_MAXFD: 362 *retval = fdp->fd_lastfile; 363 return 0; 364 365 case F_SETLKW: 366 case F_SETLK: 367 case F_GETLK: 368 error = copyin(SCARG(uap, arg), &fl, sizeof(fl)); 369 if (error) 370 return error; 371 error = do_fcntl_lock(fd, cmd, &fl); 372 if (cmd == F_GETLK && error == 0) 373 error = copyout(&fl, SCARG(uap, arg), sizeof(fl)); 374 return error; 375 376 default: 377 /* Handled below */ 378 break; 379 } 380 381 if ((fp = fd_getfile(fd)) == NULL) 382 return SET_ERROR(EBADF); 383 384 if ((cmd & F_FSCTL)) { 385 error = fcntl_forfs(fd, fp, cmd, SCARG(uap, arg)); 386 fd_putfile(fd); 387 return error; 388 } 389 390 switch (cmd) { 391 case F_DUPFD_CLOFORK: 392 clofork = true; 393 goto f_dupfd; 394 case F_DUPFD_CLOBOTH: 395 clofork = true; 396 /*FALLTHROUGH*/ 397 case F_DUPFD_CLOEXEC: 398 cloexec = true; 399 /*FALLTHROUGH*/ 400 case F_DUPFD: 401 f_dupfd:; 402 newmin = (long)SCARG(uap, arg); 403 if ((u_int)newmin >= 404 l->l_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 405 (u_int)newmin >= maxfiles) { 406 fd_putfile(fd); 407 return SET_ERROR(EINVAL); 408 } 409 error = fd_dup(fp, newmin, &i, cloexec, clofork); 410 *retval = i; 411 break; 412 413 case F_GETFD: 414 dt = atomic_load_consume(&fdp->fd_dt); 415 *retval = (dt->dt_ff[fd]->ff_exclose ? FD_CLOEXEC : 0) | 416 (dt->dt_ff[fd]->ff_foclose ? FD_CLOFORK: 0); 417 break; 418 419 case F_SETFD: 420 tmp = (intptr_t)SCARG(uap, arg); 421 fd_set_exclose(l, fd, (tmp & FD_CLOEXEC) != 0); 422 fd_set_foclose(l, fd, (tmp & FD_CLOFORK) != 0); 423 break; 424 425 case F_GETNOSIGPIPE: 426 *retval = (fp->f_flag & FNOSIGPIPE) != 0; 427 break; 428 429 case F_SETNOSIGPIPE: 430 if (SCARG(uap, arg)) 431 atomic_or_uint(&fp->f_flag, FNOSIGPIPE); 432 else 433 atomic_and_uint(&fp->f_flag, ~FNOSIGPIPE); 434 *retval = 0; 435 break; 436 437 case F_GETFL: 438 *retval = OFLAGS(fp->f_flag); 439 break; 440 441 case F_SETFL: 442 /* XXX not guaranteed to be atomic. */ 443 tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS; 444 error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, &tmp); 445 if (error) 446 break; 447 i = tmp ^ fp->f_flag; 448 if (i & FNONBLOCK) { 449 int flgs = tmp & FNONBLOCK; 450 error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, &flgs); 451 if (error) { 452 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 453 &fp->f_flag); 454 break; 455 } 456 } 457 if (i & FASYNC) { 458 int flgs = tmp & FASYNC; 459 error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, &flgs); 460 if (error) { 461 if (i & FNONBLOCK) { 462 tmp = fp->f_flag & FNONBLOCK; 463 (void)(*fp->f_ops->fo_ioctl)(fp, 464 FIONBIO, &tmp); 465 } 466 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 467 &fp->f_flag); 468 break; 469 } 470 } 471 fp->f_flag = (fp->f_flag & ~FCNTLFLAGS) | tmp; 472 break; 473 474 case F_GETOWN: 475 error = (*fp->f_ops->fo_ioctl)(fp, FIOGETOWN, &tmp); 476 *retval = tmp; 477 break; 478 479 case F_SETOWN: 480 tmp = (int)(uintptr_t) SCARG(uap, arg); 481 error = (*fp->f_ops->fo_ioctl)(fp, FIOSETOWN, &tmp); 482 break; 483 484 case F_GETPATH: 485 kpath = PNBUF_GET(); 486 487 /* vnodes need extra context, so are handled separately */ 488 if (fp->f_type == DTYPE_VNODE) 489 error = vnode_to_path(kpath, MAXPATHLEN, fp->f_vnode, 490 l, l->l_proc); 491 else 492 error = (*fp->f_ops->fo_fcntl)(fp, F_GETPATH, kpath); 493 494 if (error == 0) 495 error = copyoutstr(kpath, SCARG(uap, arg), MAXPATHLEN, 496 NULL); 497 498 PNBUF_PUT(kpath); 499 break; 500 501 case F_ADD_SEALS: 502 tmp = (int)(uintptr_t) SCARG(uap, arg); 503 error = (*fp->f_ops->fo_fcntl)(fp, F_ADD_SEALS, &tmp); 504 break; 505 506 case F_GET_SEALS: 507 error = (*fp->f_ops->fo_fcntl)(fp, F_GET_SEALS, &tmp); 508 *retval = tmp; 509 break; 510 511 default: 512 error = SET_ERROR(EINVAL); 513 } 514 515 fd_putfile(fd); 516 return (error); 517 } 518 519 /* 520 * Close a file descriptor. 521 */ 522 int 523 sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval) 524 { 525 /* { 526 syscallarg(int) fd; 527 } */ 528 int error; 529 int fd = SCARG(uap, fd); 530 531 if (fd_getfile(fd) == NULL) { 532 return SET_ERROR(EBADF); 533 } 534 535 error = fd_close(fd); 536 if (error == ERESTART) { 537 #ifdef DIAGNOSTIC 538 printf("%s[%d]: close(%d) returned ERESTART\n", 539 l->l_proc->p_comm, (int)l->l_proc->p_pid, fd); 540 #endif 541 error = SET_ERROR(EINTR); 542 } 543 544 return error; 545 } 546 547 /* 548 * Return status information about a file descriptor. 549 * Common function for compat code. 550 */ 551 int 552 do_sys_fstat(int fd, struct stat *sb) 553 { 554 file_t *fp; 555 int error; 556 557 if ((fp = fd_getfile(fd)) == NULL) { 558 return SET_ERROR(EBADF); 559 } 560 error = (*fp->f_ops->fo_stat)(fp, sb); 561 fd_putfile(fd); 562 563 return error; 564 } 565 566 /* 567 * Return status information about a file descriptor. 568 */ 569 int 570 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, 571 register_t *retval) 572 { 573 /* { 574 syscallarg(int) fd; 575 syscallarg(struct stat *) sb; 576 } */ 577 struct stat sb; 578 int error; 579 580 error = do_sys_fstat(SCARG(uap, fd), &sb); 581 if (error == 0) { 582 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 583 } 584 return error; 585 } 586 587 /* 588 * Return pathconf information about a file descriptor. 589 */ 590 int 591 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, 592 register_t *retval) 593 { 594 /* { 595 syscallarg(int) fd; 596 syscallarg(int) name; 597 } */ 598 int fd, name, error; 599 file_t *fp; 600 601 fd = SCARG(uap, fd); 602 name = SCARG(uap, name); 603 error = 0; 604 605 if ((fp = fd_getfile(fd)) == NULL) 606 return SET_ERROR(EBADF); 607 if (fp->f_ops->fo_fpathconf == NULL) 608 error = SET_ERROR(EOPNOTSUPP); 609 else 610 error = (*fp->f_ops->fo_fpathconf)(fp, name, retval); 611 fd_putfile(fd); 612 return error; 613 } 614 615 /* 616 * Apply an advisory lock on a file descriptor. 617 * 618 * Just attempt to get a record lock of the requested type on 619 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). 620 */ 621 /* ARGSUSED */ 622 int 623 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) 624 { 625 /* { 626 syscallarg(int) fd; 627 syscallarg(int) how; 628 } */ 629 int fd, how, error; 630 struct file *fp = NULL; 631 int (*fo_advlock)(struct file *, void *, int, struct flock *, int); 632 struct flock lf; 633 634 fd = SCARG(uap, fd); 635 how = SCARG(uap, how); 636 637 if ((fp = fd_getfile(fd)) == NULL) { 638 error = SET_ERROR(EBADF); 639 goto out; 640 } 641 if ((fo_advlock = fp->f_ops->fo_advlock) == NULL) { 642 KASSERT((atomic_load_relaxed(&fp->f_flag) & FHASLOCK) == 0); 643 error = SET_ERROR(EOPNOTSUPP); 644 goto out; 645 } 646 647 lf.l_whence = SEEK_SET; 648 lf.l_start = 0; 649 lf.l_len = 0; 650 651 switch (how & ~LOCK_NB) { 652 case LOCK_UN: 653 lf.l_type = F_UNLCK; 654 atomic_and_uint(&fp->f_flag, ~FHASLOCK); 655 error = (*fo_advlock)(fp, fp, F_UNLCK, &lf, F_FLOCK); 656 goto out; 657 case LOCK_EX: 658 lf.l_type = F_WRLCK; 659 break; 660 case LOCK_SH: 661 lf.l_type = F_RDLCK; 662 break; 663 default: 664 error = SET_ERROR(EINVAL); 665 goto out; 666 } 667 668 atomic_or_uint(&fp->f_flag, FHASLOCK); 669 if (how & LOCK_NB) { 670 error = (*fo_advlock)(fp, fp, F_SETLK, &lf, F_FLOCK); 671 } else { 672 error = (*fo_advlock)(fp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); 673 } 674 out: if (fp) 675 fd_putfile(fd); 676 return error; 677 } 678 679 int 680 do_posix_fadvise(int fd, off_t offset, off_t len, int advice) 681 { 682 file_t *fp; 683 int error; 684 685 if ((fp = fd_getfile(fd)) == NULL) 686 return SET_ERROR(EBADF); 687 if (fp->f_ops->fo_posix_fadvise == NULL) { 688 error = SET_ERROR(EOPNOTSUPP); 689 } else { 690 error = (*fp->f_ops->fo_posix_fadvise)(fp, offset, len, 691 advice); 692 } 693 fd_putfile(fd); 694 return error; 695 } 696 697 int 698 sys___posix_fadvise50(struct lwp *l, 699 const struct sys___posix_fadvise50_args *uap, 700 register_t *retval) 701 { 702 /* { 703 syscallarg(int) fd; 704 syscallarg(int) pad; 705 syscallarg(off_t) offset; 706 syscallarg(off_t) len; 707 syscallarg(int) advice; 708 } */ 709 710 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), 711 SCARG(uap, len), SCARG(uap, advice)); 712 713 return 0; 714 } 715 716 int 717 sys_pipe(struct lwp *l, const void *v, register_t *retval) 718 { 719 int fd[2], error; 720 721 if ((error = pipe1(l, fd, 0)) != 0) 722 return error; 723 724 retval[0] = fd[0]; 725 retval[1] = fd[1]; 726 727 return 0; 728 } 729 730 int 731 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) 732 { 733 /* { 734 syscallarg(int[2]) fildes; 735 syscallarg(int) flags; 736 } */ 737 int fd[2], error; 738 739 if ((error = pipe1(l, fd, SCARG(uap, flags))) != 0) 740 return error; 741 742 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) 743 return error; 744 retval[0] = 0; 745 return 0; 746 } 747
Indexes created Sun Aug 02 00:25:04 UTC 2026