sys_descrip.c revision 1.32
1 /* $NetBSD: sys_descrip.c,v 1.32 2019/02/03 03:19:28 mrg 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 1.32 2019/02/03 03:19:28 mrg 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 file_t *fp; 332 struct flock fl; 333 bool cloexec = false; 334 335 fd = SCARG(uap, fd); 336 cmd = SCARG(uap, cmd); 337 fdp = l->l_fd; 338 error = 0; 339 340 switch (cmd) { 341 case F_CLOSEM: 342 if (fd < 0) 343 return EBADF; 344 while ((i = fdp->fd_lastfile) >= fd) { 345 if (fd_getfile(i) == NULL) { 346 /* Another thread has updated. */ 347 continue; 348 } 349 fd_close(i); 350 } 351 return 0; 352 353 case F_MAXFD: 354 *retval = fdp->fd_lastfile; 355 return 0; 356 357 case F_SETLKW: 358 case F_SETLK: 359 case F_GETLK: 360 error = copyin(SCARG(uap, arg), &fl, sizeof(fl)); 361 if (error) 362 return error; 363 error = do_fcntl_lock(fd, cmd, &fl); 364 if (cmd == F_GETLK && error == 0) 365 error = copyout(&fl, SCARG(uap, arg), sizeof(fl)); 366 return error; 367 368 default: 369 /* Handled below */ 370 break; 371 } 372 373 if ((fp = fd_getfile(fd)) == NULL) 374 return (EBADF); 375 376 if ((cmd & F_FSCTL)) { 377 error = fcntl_forfs(fd, fp, cmd, SCARG(uap, arg)); 378 fd_putfile(fd); 379 return error; 380 } 381 382 switch (cmd) { 383 case F_DUPFD_CLOEXEC: 384 cloexec = true; 385 /*FALLTHROUGH*/ 386 case F_DUPFD: 387 newmin = (long)SCARG(uap, arg); 388 if ((u_int)newmin >= 389 l->l_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur || 390 (u_int)newmin >= maxfiles) { 391 fd_putfile(fd); 392 return EINVAL; 393 } 394 error = fd_dup(fp, newmin, &i, cloexec); 395 *retval = i; 396 break; 397 398 case F_GETFD: 399 *retval = fdp->fd_dt->dt_ff[fd]->ff_exclose; 400 break; 401 402 case F_SETFD: 403 fd_set_exclose(l, fd, 404 ((long)SCARG(uap, arg) & FD_CLOEXEC) != 0); 405 break; 406 407 case F_GETNOSIGPIPE: 408 *retval = (fp->f_flag & FNOSIGPIPE) != 0; 409 break; 410 411 case F_SETNOSIGPIPE: 412 if (SCARG(uap, arg)) 413 atomic_or_uint(&fp->f_flag, FNOSIGPIPE); 414 else 415 atomic_and_uint(&fp->f_flag, ~FNOSIGPIPE); 416 *retval = 0; 417 break; 418 419 case F_GETFL: 420 *retval = OFLAGS(fp->f_flag); 421 break; 422 423 case F_SETFL: 424 /* XXX not guaranteed to be atomic. */ 425 tmp = FFLAGS((long)SCARG(uap, arg)) & FCNTLFLAGS; 426 error = (*fp->f_ops->fo_fcntl)(fp, F_SETFL, &tmp); 427 if (error) 428 break; 429 i = tmp ^ fp->f_flag; 430 if (i & FNONBLOCK) { 431 int flgs = tmp & FNONBLOCK; 432 error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, &flgs); 433 if (error) { 434 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 435 &fp->f_flag); 436 break; 437 } 438 } 439 if (i & FASYNC) { 440 int flgs = tmp & FASYNC; 441 error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, &flgs); 442 if (error) { 443 if (i & FNONBLOCK) { 444 tmp = fp->f_flag & FNONBLOCK; 445 (void)(*fp->f_ops->fo_ioctl)(fp, 446 FIONBIO, &tmp); 447 } 448 (*fp->f_ops->fo_fcntl)(fp, F_SETFL, 449 &fp->f_flag); 450 break; 451 } 452 } 453 fp->f_flag = (fp->f_flag & ~FCNTLFLAGS) | tmp; 454 break; 455 456 case F_GETOWN: 457 error = (*fp->f_ops->fo_ioctl)(fp, FIOGETOWN, &tmp); 458 *retval = tmp; 459 break; 460 461 case F_SETOWN: 462 tmp = (int)(uintptr_t) SCARG(uap, arg); 463 error = (*fp->f_ops->fo_ioctl)(fp, FIOSETOWN, &tmp); 464 break; 465 466 default: 467 error = EINVAL; 468 } 469 470 fd_putfile(fd); 471 return (error); 472 } 473 474 /* 475 * Close a file descriptor. 476 */ 477 int 478 sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval) 479 { 480 /* { 481 syscallarg(int) fd; 482 } */ 483 int error; 484 485 if (fd_getfile(SCARG(uap, fd)) == NULL) { 486 return EBADF; 487 } 488 489 error = fd_close(SCARG(uap, fd)); 490 if (error == ERESTART) { 491 #ifdef DIAGNOSTIC 492 printf("pid %d: close returned ERESTART\n", 493 (int)l->l_proc->p_pid); 494 #endif 495 error = EINTR; 496 } 497 498 return error; 499 } 500 501 /* 502 * Return status information about a file descriptor. 503 * Common function for compat code. 504 */ 505 int 506 do_sys_fstat(int fd, struct stat *sb) 507 { 508 file_t *fp; 509 int error; 510 511 if ((fp = fd_getfile(fd)) == NULL) { 512 return EBADF; 513 } 514 error = (*fp->f_ops->fo_stat)(fp, sb); 515 fd_putfile(fd); 516 517 return error; 518 } 519 520 /* 521 * Return status information about a file descriptor. 522 */ 523 int 524 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, 525 register_t *retval) 526 { 527 /* { 528 syscallarg(int) fd; 529 syscallarg(struct stat *) sb; 530 } */ 531 struct stat sb; 532 int error; 533 534 error = do_sys_fstat(SCARG(uap, fd), &sb); 535 if (error == 0) { 536 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 537 } 538 return error; 539 } 540 541 /* 542 * Return pathconf information about a file descriptor. 543 */ 544 int 545 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, 546 register_t *retval) 547 { 548 /* { 549 syscallarg(int) fd; 550 syscallarg(int) name; 551 } */ 552 int fd, error; 553 file_t *fp; 554 555 fd = SCARG(uap, fd); 556 error = 0; 557 558 if ((fp = fd_getfile(fd)) == NULL) { 559 return (EBADF); 560 } 561 switch (fp->f_type) { 562 case DTYPE_SOCKET: 563 case DTYPE_PIPE: 564 if (SCARG(uap, name) != _PC_PIPE_BUF) 565 error = EINVAL; 566 else 567 *retval = PIPE_BUF; 568 break; 569 570 case DTYPE_VNODE: 571 error = VOP_PATHCONF(fp->f_vnode, SCARG(uap, name), retval); 572 break; 573 574 case DTYPE_KQUEUE: 575 error = EINVAL; 576 break; 577 578 default: 579 error = EOPNOTSUPP; 580 break; 581 } 582 583 fd_putfile(fd); 584 return (error); 585 } 586 587 /* 588 * Apply an advisory lock on a file descriptor. 589 * 590 * Just attempt to get a record lock of the requested type on 591 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). 592 */ 593 /* ARGSUSED */ 594 int 595 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) 596 { 597 /* { 598 syscallarg(int) fd; 599 syscallarg(int) how; 600 } */ 601 int fd, how, error; 602 file_t *fp; 603 vnode_t *vp; 604 struct flock lf; 605 606 fd = SCARG(uap, fd); 607 how = SCARG(uap, how); 608 error = 0; 609 610 if ((fp = fd_getfile(fd)) == NULL) { 611 return EBADF; 612 } 613 if (fp->f_type != DTYPE_VNODE) { 614 fd_putfile(fd); 615 return EOPNOTSUPP; 616 } 617 618 vp = fp->f_vnode; 619 lf.l_whence = SEEK_SET; 620 lf.l_start = 0; 621 lf.l_len = 0; 622 623 switch (how & ~LOCK_NB) { 624 case LOCK_UN: 625 lf.l_type = F_UNLCK; 626 atomic_and_uint(&fp->f_flag, ~FHASLOCK); 627 error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 628 fd_putfile(fd); 629 return error; 630 case LOCK_EX: 631 lf.l_type = F_WRLCK; 632 break; 633 case LOCK_SH: 634 lf.l_type = F_RDLCK; 635 break; 636 default: 637 fd_putfile(fd); 638 return EINVAL; 639 } 640 641 atomic_or_uint(&fp->f_flag, FHASLOCK); 642 if (how & LOCK_NB) { 643 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK); 644 } else { 645 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); 646 } 647 fd_putfile(fd); 648 return error; 649 } 650 651 int 652 do_posix_fadvise(int fd, off_t offset, off_t len, int advice) 653 { 654 file_t *fp; 655 vnode_t *vp; 656 off_t endoffset; 657 int error; 658 659 CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL); 660 CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM); 661 CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL); 662 663 if (len == 0) { 664 endoffset = INT64_MAX; 665 } else if (len > 0 && (INT64_MAX - offset) >= len) { 666 endoffset = offset + len; 667 } else { 668 return EINVAL; 669 } 670 if ((fp = fd_getfile(fd)) == NULL) { 671 return EBADF; 672 } 673 if (fp->f_type != DTYPE_VNODE) { 674 if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) { 675 error = ESPIPE; 676 } else { 677 error = EOPNOTSUPP; 678 } 679 fd_putfile(fd); 680 return error; 681 } 682 683 switch (advice) { 684 case POSIX_FADV_WILLNEED: 685 case POSIX_FADV_DONTNEED: 686 vp = fp->f_vnode; 687 if (vp->v_type != VREG && vp->v_type != VBLK) { 688 fd_putfile(fd); 689 return 0; 690 } 691 break; 692 } 693 694 switch (advice) { 695 case POSIX_FADV_NORMAL: 696 case POSIX_FADV_RANDOM: 697 case POSIX_FADV_SEQUENTIAL: 698 /* 699 * We ignore offset and size. Must lock the file to 700 * do this, as f_advice is sub-word sized. 701 */ 702 mutex_enter(&fp->f_lock); 703 fp->f_advice = (u_char)advice; 704 mutex_exit(&fp->f_lock); 705 error = 0; 706 break; 707 708 case POSIX_FADV_WILLNEED: 709 vp = fp->f_vnode; 710 error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset); 711 break; 712 713 case POSIX_FADV_DONTNEED: 714 vp = fp->f_vnode; 715 /* 716 * Align the region to page boundaries as VOP_PUTPAGES expects 717 * by shrinking it. We shrink instead of expand because we 718 * do not want to deactivate cache outside of the requested 719 * region. It means that if the specified region is smaller 720 * than PAGE_SIZE, we do nothing. 721 */ 722 if (round_page(offset) < trunc_page(endoffset) && 723 offset <= round_page(offset)) { 724 mutex_enter(vp->v_interlock); 725 error = VOP_PUTPAGES(vp, 726 round_page(offset), trunc_page(endoffset), 727 PGO_DEACTIVATE | PGO_CLEANIT); 728 } else { 729 error = 0; 730 } 731 break; 732 733 case POSIX_FADV_NOREUSE: 734 /* Not implemented yet. */ 735 error = 0; 736 break; 737 default: 738 error = EINVAL; 739 break; 740 } 741 742 fd_putfile(fd); 743 return error; 744 } 745 746 int 747 sys___posix_fadvise50(struct lwp *l, 748 const struct sys___posix_fadvise50_args *uap, 749 register_t *retval) 750 { 751 /* { 752 syscallarg(int) fd; 753 syscallarg(int) pad; 754 syscallarg(off_t) offset; 755 syscallarg(off_t) len; 756 syscallarg(int) advice; 757 } */ 758 759 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), 760 SCARG(uap, len), SCARG(uap, advice)); 761 762 return 0; 763 } 764 765 int 766 sys_pipe(struct lwp *l, const void *v, register_t *retval) 767 { 768 int fd[2], error; 769 770 if ((error = pipe1(l, fd, 0)) != 0) 771 return error; 772 773 retval[0] = fd[0]; 774 retval[1] = fd[1]; 775 776 return 0; 777 } 778 779 int 780 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) 781 { 782 /* { 783 syscallarg(int[2]) fildes; 784 syscallarg(int) flags; 785 } */ 786 int fd[2], error; 787 788 if ((error = pipe1(l, fd, SCARG(uap, flags))) != 0) 789 return error; 790 791 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) 792 return error; 793 retval[0] = 0; 794 return 0; 795 } 796
Indexes created Thu Sep 25 08:09:54 GMT 2025