sys_descrip.c revision 1.31.4.2
1 /* $NetBSD: sys_descrip.c,v 1.31.4.2 2020/04/08 14:08:52 martin 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 1.31.4.2 2020/04/08 14:08:52 martin 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 /* FALLTHROUGH */ 261 case F_SETLK: 262 switch (fl->l_type) { 263 case F_RDLCK: 264 if ((fp->f_flag & FREAD) == 0) { 265 error = EBADF; 266 break; 267 } 268 if ((p->p_flag & PK_ADVLOCK) == 0) { 269 mutex_enter(p->p_lock); 270 p->p_flag |= PK_ADVLOCK; 271 mutex_exit(p->p_lock); 272 } 273 error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); 274 break; 275 276 case F_WRLCK: 277 if ((fp->f_flag & FWRITE) == 0) { 278 error = EBADF; 279 break; 280 } 281 if ((p->p_flag & PK_ADVLOCK) == 0) { 282 mutex_enter(p->p_lock); 283 p->p_flag |= PK_ADVLOCK; 284 mutex_exit(p->p_lock); 285 } 286 error = VOP_ADVLOCK(vp, p, F_SETLK, fl, flg); 287 break; 288 289 case F_UNLCK: 290 error = VOP_ADVLOCK(vp, p, F_UNLCK, fl, F_POSIX); 291 break; 292 293 default: 294 error = EINVAL; 295 break; 296 } 297 break; 298 299 case F_GETLK: 300 if (fl->l_type != F_RDLCK && 301 fl->l_type != F_WRLCK && 302 fl->l_type != F_UNLCK) { 303 error = EINVAL; 304 break; 305 } 306 error = VOP_ADVLOCK(vp, p, F_GETLK, fl, F_POSIX); 307 break; 308 309 default: 310 error = EINVAL; 311 break; 312 } 313 314 fd_putfile(fd); 315 return error; 316 } 317 318 /* 319 * The file control system call. 320 */ 321 int 322 sys_fcntl(struct lwp *l, const struct sys_fcntl_args *uap, register_t *retval) 323 { 324 /* { 325 syscallarg(int) fd; 326 syscallarg(int) cmd; 327 syscallarg(void *) arg; 328 } */ 329 int fd, i, tmp, error, cmd, newmin; 330 filedesc_t *fdp; 331 fdtab_t *dt; 332 file_t *fp; 333 struct flock fl; 334 bool cloexec = false; 335 336 fd = SCARG(uap, fd); 337 cmd = SCARG(uap, cmd); 338 fdp = l->l_fd; 339 error = 0; 340 341 switch (cmd) { 342 case F_CLOSEM: 343 if (fd < 0) 344 return EBADF; 345 while ((i = fdp->fd_lastfile) >= fd) { 346 if (fd_getfile(i) == NULL) { 347 /* Another thread has updated. */ 348 continue; 349 } 350 fd_close(i); 351 } 352 return 0; 353 354 case F_MAXFD: 355 *retval = fdp->fd_lastfile; 356 return 0; 357 358 case F_SETLKW: 359 case F_SETLK: 360 case F_GETLK: 361 error = copyin(SCARG(uap, arg), &fl, sizeof(fl)); 362 if (error) 363 return error; 364 error = do_fcntl_lock(fd, cmd, &fl); 365 if (cmd == F_GETLK && error == 0) 366 error = copyout(&fl, SCARG(uap, arg), sizeof(fl)); 367 return error; 368 369 default: 370 /* Handled below */ 371 break; 372 } 373 374 if ((fp = fd_getfile(fd)) == NULL) 375 return (EBADF); 376 377 if ((cmd & F_FSCTL)) { 378 error = fcntl_forfs(fd, fp, cmd, SCARG(uap, arg)); 379 fd_putfile(fd); 380 return error; 381 } 382 383 switch (cmd) { 384 case F_DUPFD_CLOEXEC: 385 cloexec = true; 386 /*FALLTHROUGH*/ 387 case F_DUPFD: 388 newmin = (long)SCARG(uap, arg); 389 if ((u_int)newmin >= 390 l->l_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 391 (u_int)newmin >= maxfiles) { 392 fd_putfile(fd); 393 return EINVAL; 394 } 395 error = fd_dup(fp, newmin, &i, cloexec); 396 *retval = i; 397 break; 398 399 case F_GETFD: 400 dt = atomic_load_consume(&fdp->fd_dt); 401 *retval = dt->dt_ff[fd]->ff_exclose; 402 break; 403 404 case F_SETFD: 405 fd_set_exclose(l, fd, 406 ((long)SCARG(uap, arg) & FD_CLOEXEC) != 0); 407 break; 408 409 case F_GETNOSIGPIPE: 410 *retval = (fp->f_flag & FNOSIGPIPE) != 0; 411 break; 412 413 case F_SETNOSIGPIPE: 414 if (SCARG(uap, arg)) 415 atomic_or_uint(&fp->f_flag, FNOSIGPIPE); 416 else 417 atomic_and_uint(&fp->f_flag, ~FNOSIGPIPE); 418 *retval = 0; 419 break; 420 421 case F_GETFL: 422 *retval = OFLAGS(fp->f_flag); 423 break; 424 425 case F_SETFL: 426 /* XXX not guaranteed to be atomic. */ 427 tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS; 428 error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, &tmp); 429 if (error) 430 break; 431 i = tmp ^ fp->f_flag; 432 if (i & FNONBLOCK) { 433 int flgs = tmp & FNONBLOCK; 434 error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, &flgs); 435 if (error) { 436 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 437 &fp->f_flag); 438 break; 439 } 440 } 441 if (i & FASYNC) { 442 int flgs = tmp & FASYNC; 443 error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, &flgs); 444 if (error) { 445 if (i & FNONBLOCK) { 446 tmp = fp->f_flag & FNONBLOCK; 447 (void)(*fp->f_ops->fo_ioctl)(fp, 448 FIONBIO, &tmp); 449 } 450 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 451 &fp->f_flag); 452 break; 453 } 454 } 455 fp->f_flag = (fp->f_flag & ~FCNTLFLAGS) | tmp; 456 break; 457 458 case F_GETOWN: 459 error = (*fp->f_ops->fo_ioctl)(fp, FIOGETOWN, &tmp); 460 *retval = tmp; 461 break; 462 463 case F_SETOWN: 464 tmp = (int)(uintptr_t) SCARG(uap, arg); 465 error = (*fp->f_ops->fo_ioctl)(fp, FIOSETOWN, &tmp); 466 break; 467 468 default: 469 error = EINVAL; 470 } 471 472 fd_putfile(fd); 473 return (error); 474 } 475 476 /* 477 * Close a file descriptor. 478 */ 479 int 480 sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval) 481 { 482 /* { 483 syscallarg(int) fd; 484 } */ 485 int error; 486 int fd = SCARG(uap, fd); 487 488 if (fd_getfile(fd) == NULL) { 489 return EBADF; 490 } 491 492 error = fd_close(fd); 493 if (error == ERESTART) { 494 #ifdef DIAGNOSTIC 495 printf("%s[%d]: close(%d) returned ERESTART\n", 496 l->l_proc->p_comm, (int)l->l_proc->p_pid, fd); 497 #endif 498 error = EINTR; 499 } 500 501 return error; 502 } 503 504 /* 505 * Return status information about a file descriptor. 506 * Common function for compat code. 507 */ 508 int 509 do_sys_fstat(int fd, struct stat *sb) 510 { 511 file_t *fp; 512 int error; 513 514 if ((fp = fd_getfile(fd)) == NULL) { 515 return EBADF; 516 } 517 error = (*fp->f_ops->fo_stat)(fp, sb); 518 fd_putfile(fd); 519 520 return error; 521 } 522 523 /* 524 * Return status information about a file descriptor. 525 */ 526 int 527 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, 528 register_t *retval) 529 { 530 /* { 531 syscallarg(int) fd; 532 syscallarg(struct stat *) sb; 533 } */ 534 struct stat sb; 535 int error; 536 537 error = do_sys_fstat(SCARG(uap, fd), &sb); 538 if (error == 0) { 539 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 540 } 541 return error; 542 } 543 544 /* 545 * Return pathconf information about a file descriptor. 546 */ 547 int 548 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, 549 register_t *retval) 550 { 551 /* { 552 syscallarg(int) fd; 553 syscallarg(int) name; 554 } */ 555 int fd, error; 556 file_t *fp; 557 558 fd = SCARG(uap, fd); 559 error = 0; 560 561 if ((fp = fd_getfile(fd)) == NULL) { 562 return (EBADF); 563 } 564 switch (fp->f_type) { 565 case DTYPE_SOCKET: 566 case DTYPE_PIPE: 567 if (SCARG(uap, name) != _PC_PIPE_BUF) 568 error = EINVAL; 569 else 570 *retval = PIPE_BUF; 571 break; 572 573 case DTYPE_VNODE: 574 error = VOP_PATHCONF(fp->f_vnode, SCARG(uap, name), retval); 575 break; 576 577 case DTYPE_KQUEUE: 578 error = EINVAL; 579 break; 580 581 default: 582 error = EOPNOTSUPP; 583 break; 584 } 585 586 fd_putfile(fd); 587 return (error); 588 } 589 590 /* 591 * Apply an advisory lock on a file descriptor. 592 * 593 * Just attempt to get a record lock of the requested type on 594 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). 595 */ 596 /* ARGSUSED */ 597 int 598 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) 599 { 600 /* { 601 syscallarg(int) fd; 602 syscallarg(int) how; 603 } */ 604 int fd, how, error; 605 file_t *fp; 606 vnode_t *vp; 607 struct flock lf; 608 609 fd = SCARG(uap, fd); 610 how = SCARG(uap, how); 611 error = 0; 612 613 if ((fp = fd_getfile(fd)) == NULL) { 614 return EBADF; 615 } 616 if (fp->f_type != DTYPE_VNODE) { 617 fd_putfile(fd); 618 return EOPNOTSUPP; 619 } 620 621 vp = fp->f_vnode; 622 lf.l_whence = SEEK_SET; 623 lf.l_start = 0; 624 lf.l_len = 0; 625 626 switch (how & ~LOCK_NB) { 627 case LOCK_UN: 628 lf.l_type = F_UNLCK; 629 atomic_and_uint(&fp->f_flag, ~FHASLOCK); 630 error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 631 fd_putfile(fd); 632 return error; 633 case LOCK_EX: 634 lf.l_type = F_WRLCK; 635 break; 636 case LOCK_SH: 637 lf.l_type = F_RDLCK; 638 break; 639 default: 640 fd_putfile(fd); 641 return EINVAL; 642 } 643 644 atomic_or_uint(&fp->f_flag, FHASLOCK); 645 if (how & LOCK_NB) { 646 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK); 647 } else { 648 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); 649 } 650 fd_putfile(fd); 651 return error; 652 } 653 654 int 655 do_posix_fadvise(int fd, off_t offset, off_t len, int advice) 656 { 657 file_t *fp; 658 vnode_t *vp; 659 off_t endoffset; 660 int error; 661 662 CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL); 663 CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM); 664 CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL); 665 666 if (len == 0) { 667 endoffset = INT64_MAX; 668 } else if (len > 0 && (INT64_MAX - offset) >= len) { 669 endoffset = offset + len; 670 } else { 671 return EINVAL; 672 } 673 if ((fp = fd_getfile(fd)) == NULL) { 674 return EBADF; 675 } 676 if (fp->f_type != DTYPE_VNODE) { 677 if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) { 678 error = ESPIPE; 679 } else { 680 error = EOPNOTSUPP; 681 } 682 fd_putfile(fd); 683 return error; 684 } 685 686 switch (advice) { 687 case POSIX_FADV_WILLNEED: 688 case POSIX_FADV_DONTNEED: 689 vp = fp->f_vnode; 690 if (vp->v_type != VREG && vp->v_type != VBLK) { 691 fd_putfile(fd); 692 return 0; 693 } 694 break; 695 } 696 697 switch (advice) { 698 case POSIX_FADV_NORMAL: 699 case POSIX_FADV_RANDOM: 700 case POSIX_FADV_SEQUENTIAL: 701 /* 702 * We ignore offset and size. Must lock the file to 703 * do this, as f_advice is sub-word sized. 704 */ 705 mutex_enter(&fp->f_lock); 706 fp->f_advice = (u_char)advice; 707 mutex_exit(&fp->f_lock); 708 error = 0; 709 break; 710 711 case POSIX_FADV_WILLNEED: 712 vp = fp->f_vnode; 713 error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset); 714 break; 715 716 case POSIX_FADV_DONTNEED: 717 vp = fp->f_vnode; 718 /* 719 * Align the region to page boundaries as VOP_PUTPAGES expects 720 * by shrinking it. We shrink instead of expand because we 721 * do not want to deactivate cache outside of the requested 722 * region. It means that if the specified region is smaller 723 * than PAGE_SIZE, we do nothing. 724 */ 725 if (round_page(offset) < trunc_page(endoffset) && 726 offset <= round_page(offset)) { 727 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 728 error = VOP_PUTPAGES(vp, 729 round_page(offset), trunc_page(endoffset), 730 PGO_DEACTIVATE | PGO_CLEANIT); 731 } else { 732 error = 0; 733 } 734 break; 735 736 case POSIX_FADV_NOREUSE: 737 /* Not implemented yet. */ 738 error = 0; 739 break; 740 default: 741 error = EINVAL; 742 break; 743 } 744 745 fd_putfile(fd); 746 return error; 747 } 748 749 int 750 sys___posix_fadvise50(struct lwp *l, 751 const struct sys___posix_fadvise50_args *uap, 752 register_t *retval) 753 { 754 /* { 755 syscallarg(int) fd; 756 syscallarg(int) pad; 757 syscallarg(off_t) offset; 758 syscallarg(off_t) len; 759 syscallarg(int) advice; 760 } */ 761 762 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), 763 SCARG(uap, len), SCARG(uap, advice)); 764 765 return 0; 766 } 767 768 int 769 sys_pipe(struct lwp *l, const void *v, register_t *retval) 770 { 771 int fd[2], error; 772 773 if ((error = pipe1(l, fd, 0)) != 0) 774 return error; 775 776 retval[0] = fd[0]; 777 retval[1] = fd[1]; 778 779 return 0; 780 } 781 782 int 783 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) 784 { 785 /* { 786 syscallarg(int[2]) fildes; 787 syscallarg(int) flags; 788 } */ 789 int fd[2], error; 790 791 if ((error = pipe1(l, fd, SCARG(uap, flags))) != 0) 792 return error; 793 794 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) 795 return error; 796 retval[0] = 0; 797 return 0; 798 } 799
Indexes created Wed Oct 22 06:10:02 GMT 2025