sys_descrip.c revision 1.25
1 /* $NetBSD: sys_descrip.c,v 1.25 2012/01/25 14:04:09 christos 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 1.25 2012/01/25 14:04:09 christos 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 new, error, old; 109 file_t *fp; 110 111 old = SCARG(uap, fd); 112 113 if ((fp = fd_getfile(old)) == NULL) { 114 return EBADF; 115 } 116 error = fd_dup(fp, 0, &new, false); 117 fd_putfile(old); 118 *retval = new; 119 return error; 120 } 121 122 /* 123 * Duplicate a file descriptor to a particular value. 124 */ 125 static 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_data; 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 } */ 482 483 if (fd_getfile(SCARG(uap, fd)) == NULL) { 484 return EBADF; 485 } 486 return fd_close(SCARG(uap, fd)); 487 } 488 489 /* 490 * Return status information about a file descriptor. 491 * Common function for compat code. 492 */ 493 int 494 do_sys_fstat(int fd, struct stat *sb) 495 { 496 file_t *fp; 497 int error; 498 499 if ((fp = fd_getfile(fd)) == NULL) { 500 return EBADF; 501 } 502 error = (*fp->f_ops->fo_stat)(fp, sb); 503 fd_putfile(fd); 504 505 return error; 506 } 507 508 /* 509 * Return status information about a file descriptor. 510 */ 511 int 512 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap, 513 register_t *retval) 514 { 515 /* { 516 syscallarg(int) fd; 517 syscallarg(struct stat *) sb; 518 } */ 519 struct stat sb; 520 int error; 521 522 error = do_sys_fstat(SCARG(uap, fd), &sb); 523 if (error == 0) { 524 error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); 525 } 526 return error; 527 } 528 529 /* 530 * Return pathconf information about a file descriptor. 531 */ 532 int 533 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap, 534 register_t *retval) 535 { 536 /* { 537 syscallarg(int) fd; 538 syscallarg(int) name; 539 } */ 540 int fd, error; 541 file_t *fp; 542 543 fd = SCARG(uap, fd); 544 error = 0; 545 546 if ((fp = fd_getfile(fd)) == NULL) { 547 return (EBADF); 548 } 549 switch (fp->f_type) { 550 case DTYPE_SOCKET: 551 case DTYPE_PIPE: 552 if (SCARG(uap, name) != _PC_PIPE_BUF) 553 error = EINVAL; 554 else 555 *retval = PIPE_BUF; 556 break; 557 558 case DTYPE_VNODE: 559 error = VOP_PATHCONF(fp->f_data, SCARG(uap, name), retval); 560 break; 561 562 case DTYPE_KQUEUE: 563 error = EINVAL; 564 break; 565 566 default: 567 error = EOPNOTSUPP; 568 break; 569 } 570 571 fd_putfile(fd); 572 return (error); 573 } 574 575 /* 576 * Apply an advisory lock on a file descriptor. 577 * 578 * Just attempt to get a record lock of the requested type on 579 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0). 580 */ 581 /* ARGSUSED */ 582 int 583 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval) 584 { 585 /* { 586 syscallarg(int) fd; 587 syscallarg(int) how; 588 } */ 589 int fd, how, error; 590 file_t *fp; 591 vnode_t *vp; 592 struct flock lf; 593 proc_t *p; 594 595 fd = SCARG(uap, fd); 596 how = SCARG(uap, how); 597 error = 0; 598 599 if ((fp = fd_getfile(fd)) == NULL) { 600 return EBADF; 601 } 602 if (fp->f_type != DTYPE_VNODE) { 603 fd_putfile(fd); 604 return EOPNOTSUPP; 605 } 606 607 vp = fp->f_data; 608 lf.l_whence = SEEK_SET; 609 lf.l_start = 0; 610 lf.l_len = 0; 611 612 switch (how & ~LOCK_NB) { 613 case LOCK_UN: 614 lf.l_type = F_UNLCK; 615 atomic_and_uint(&fp->f_flag, ~FHASLOCK); 616 error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK); 617 fd_putfile(fd); 618 return error; 619 case LOCK_EX: 620 lf.l_type = F_WRLCK; 621 break; 622 case LOCK_SH: 623 lf.l_type = F_RDLCK; 624 break; 625 default: 626 fd_putfile(fd); 627 return EINVAL; 628 } 629 630 atomic_or_uint(&fp->f_flag, FHASLOCK); 631 p = curproc; 632 if (how & LOCK_NB) { 633 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK); 634 } else { 635 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT); 636 } 637 fd_putfile(fd); 638 return error; 639 } 640 641 int 642 do_posix_fadvise(int fd, off_t offset, off_t len, int advice) 643 { 644 file_t *fp; 645 vnode_t *vp; 646 off_t endoffset; 647 int error; 648 649 CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL); 650 CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM); 651 CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL); 652 653 if (len == 0) { 654 endoffset = INT64_MAX; 655 } else if (len > 0 && (INT64_MAX - offset) >= len) { 656 endoffset = offset + len; 657 } else { 658 return EINVAL; 659 } 660 if ((fp = fd_getfile(fd)) == NULL) { 661 return EBADF; 662 } 663 if (fp->f_type != DTYPE_VNODE) { 664 if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) { 665 error = ESPIPE; 666 } else { 667 error = EOPNOTSUPP; 668 } 669 fd_putfile(fd); 670 return error; 671 } 672 673 switch (advice) { 674 case POSIX_FADV_WILLNEED: 675 case POSIX_FADV_DONTNEED: 676 vp = fp->f_data; 677 if (vp->v_type != VREG && vp->v_type != VBLK) { 678 fd_putfile(fd); 679 return 0; 680 } 681 break; 682 } 683 684 switch (advice) { 685 case POSIX_FADV_NORMAL: 686 case POSIX_FADV_RANDOM: 687 case POSIX_FADV_SEQUENTIAL: 688 /* 689 * We ignore offset and size. Must lock the file to 690 * do this, as f_advice is sub-word sized. 691 */ 692 mutex_enter(&fp->f_lock); 693 fp->f_advice = (u_char)advice; 694 mutex_exit(&fp->f_lock); 695 error = 0; 696 break; 697 698 case POSIX_FADV_WILLNEED: 699 vp = fp->f_data; 700 error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset); 701 break; 702 703 case POSIX_FADV_DONTNEED: 704 vp = fp->f_data; 705 /* 706 * Align the region to page boundaries as VOP_PUTPAGES expects 707 * by shrinking it. We shrink instead of expand because we 708 * do not want to deactivate cache outside of the requested 709 * region. It means that if the specified region is smaller 710 * than PAGE_SIZE, we do nothing. 711 */ 712 if (round_page(offset) < trunc_page(endoffset) && 713 offset <= round_page(offset)) { 714 mutex_enter(vp->v_interlock); 715 error = VOP_PUTPAGES(vp, 716 round_page(offset), trunc_page(endoffset), 717 PGO_DEACTIVATE | PGO_CLEANIT); 718 } else { 719 error = 0; 720 } 721 break; 722 723 case POSIX_FADV_NOREUSE: 724 /* Not implemented yet. */ 725 error = 0; 726 break; 727 default: 728 error = EINVAL; 729 break; 730 } 731 732 fd_putfile(fd); 733 return error; 734 } 735 736 int 737 sys___posix_fadvise50(struct lwp *l, 738 const struct sys___posix_fadvise50_args *uap, 739 register_t *retval) 740 { 741 /* { 742 syscallarg(int) fd; 743 syscallarg(int) pad; 744 syscallarg(off_t) offset; 745 syscallarg(off_t) len; 746 syscallarg(int) advice; 747 } */ 748 749 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset), 750 SCARG(uap, len), SCARG(uap, advice)); 751 752 return 0; 753 } 754 755 int 756 sys_pipe(struct lwp *l, const void *v, register_t *retval) 757 { 758 return pipe1(l, retval, 0); 759 } 760 761 int 762 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval) 763 { 764 /* { 765 syscallarg(int[2]) fildes; 766 syscallarg(int) flags; 767 } */ 768 int fd[2], error; 769 770 if ((error = pipe1(l, retval, SCARG(uap, flags))) != 0) 771 return error; 772 fd[0] = retval[0]; 773 fd[1] = retval[1]; 774 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0) 775 return error; 776 retval[0] = 0; 777 return 0; 778 } 779
Indexes created Wed Sep 24 05:09:52 GMT 2025