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