1 /* $NetBSD: sys_descrip.c,v 1.30 2014/09/05 09:20:59 matt 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 1.30 2014/09/05 09:20:59 matt 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
sys_dup(struct lwp * l,const struct sys_dup_args * uap,register_t * retval)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
dodup(struct lwp * l,int from,int to,int flags,register_t * retval)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
sys_dup3(struct lwp * l,const struct sys_dup3_args * uap,register_t * retval)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
sys_dup2(struct lwp * l,const struct sys_dup2_args * uap,register_t * retval)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
fcntl_forfs(int fd,file_t * fp,int cmd,void * arg)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
do_fcntl_lock(int fd,int cmd,struct flock * fl)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 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
sys_fcntl(struct lwp * l,const struct sys_fcntl_args * uap,register_t * retval)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
sys_close(struct lwp * l,const struct sys_close_args * uap,register_t * retval)477 sys_close(struct lwp *l, const struct sys_close_args *uap, register_t *retval)
478 {
479 /* {
480 syscallarg(int) fd;
481 } */
482 int error;
483
484 if (fd_getfile(SCARG(uap, fd)) == NULL) {
485 return EBADF;
486 }
487
488 error = fd_close(SCARG(uap, fd));
489 if (error == ERESTART) {
490 #ifdef DIAGNOSTIC
491 printf("pid %d: close returned ERESTART\n",
492 (int)l->l_proc->p_pid);
493 #endif
494 error = EINTR;
495 }
496
497 return error;
498 }
499
500 /*
501 * Return status information about a file descriptor.
502 * Common function for compat code.
503 */
504 int
do_sys_fstat(int fd,struct stat * sb)505 do_sys_fstat(int fd, struct stat *sb)
506 {
507 file_t *fp;
508 int error;
509
510 if ((fp = fd_getfile(fd)) == NULL) {
511 return EBADF;
512 }
513 error = (*fp->f_ops->fo_stat)(fp, sb);
514 fd_putfile(fd);
515
516 return error;
517 }
518
519 /*
520 * Return status information about a file descriptor.
521 */
522 int
sys___fstat50(struct lwp * l,const struct sys___fstat50_args * uap,register_t * retval)523 sys___fstat50(struct lwp *l, const struct sys___fstat50_args *uap,
524 register_t *retval)
525 {
526 /* {
527 syscallarg(int) fd;
528 syscallarg(struct stat *) sb;
529 } */
530 struct stat sb;
531 int error;
532
533 error = do_sys_fstat(SCARG(uap, fd), &sb);
534 if (error == 0) {
535 error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
536 }
537 return error;
538 }
539
540 /*
541 * Return pathconf information about a file descriptor.
542 */
543 int
sys_fpathconf(struct lwp * l,const struct sys_fpathconf_args * uap,register_t * retval)544 sys_fpathconf(struct lwp *l, const struct sys_fpathconf_args *uap,
545 register_t *retval)
546 {
547 /* {
548 syscallarg(int) fd;
549 syscallarg(int) name;
550 } */
551 int fd, error;
552 file_t *fp;
553
554 fd = SCARG(uap, fd);
555 error = 0;
556
557 if ((fp = fd_getfile(fd)) == NULL) {
558 return (EBADF);
559 }
560 switch (fp->f_type) {
561 case DTYPE_SOCKET:
562 case DTYPE_PIPE:
563 if (SCARG(uap, name) != _PC_PIPE_BUF)
564 error = EINVAL;
565 else
566 *retval = PIPE_BUF;
567 break;
568
569 case DTYPE_VNODE:
570 error = VOP_PATHCONF(fp->f_vnode, SCARG(uap, name), retval);
571 break;
572
573 case DTYPE_KQUEUE:
574 error = EINVAL;
575 break;
576
577 default:
578 error = EOPNOTSUPP;
579 break;
580 }
581
582 fd_putfile(fd);
583 return (error);
584 }
585
586 /*
587 * Apply an advisory lock on a file descriptor.
588 *
589 * Just attempt to get a record lock of the requested type on
590 * the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
591 */
592 /* ARGSUSED */
593 int
sys_flock(struct lwp * l,const struct sys_flock_args * uap,register_t * retval)594 sys_flock(struct lwp *l, const struct sys_flock_args *uap, register_t *retval)
595 {
596 /* {
597 syscallarg(int) fd;
598 syscallarg(int) how;
599 } */
600 int fd, how, error;
601 file_t *fp;
602 vnode_t *vp;
603 struct flock lf;
604
605 fd = SCARG(uap, fd);
606 how = SCARG(uap, how);
607 error = 0;
608
609 if ((fp = fd_getfile(fd)) == NULL) {
610 return EBADF;
611 }
612 if (fp->f_type != DTYPE_VNODE) {
613 fd_putfile(fd);
614 return EOPNOTSUPP;
615 }
616
617 vp = fp->f_vnode;
618 lf.l_whence = SEEK_SET;
619 lf.l_start = 0;
620 lf.l_len = 0;
621
622 switch (how & ~LOCK_NB) {
623 case LOCK_UN:
624 lf.l_type = F_UNLCK;
625 atomic_and_uint(&fp->f_flag, ~FHASLOCK);
626 error = VOP_ADVLOCK(vp, fp, F_UNLCK, &lf, F_FLOCK);
627 fd_putfile(fd);
628 return error;
629 case LOCK_EX:
630 lf.l_type = F_WRLCK;
631 break;
632 case LOCK_SH:
633 lf.l_type = F_RDLCK;
634 break;
635 default:
636 fd_putfile(fd);
637 return EINVAL;
638 }
639
640 atomic_or_uint(&fp->f_flag, FHASLOCK);
641 if (how & LOCK_NB) {
642 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK);
643 } else {
644 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, F_FLOCK|F_WAIT);
645 }
646 fd_putfile(fd);
647 return error;
648 }
649
650 int
do_posix_fadvise(int fd,off_t offset,off_t len,int advice)651 do_posix_fadvise(int fd, off_t offset, off_t len, int advice)
652 {
653 file_t *fp;
654 vnode_t *vp;
655 off_t endoffset;
656 int error;
657
658 CTASSERT(POSIX_FADV_NORMAL == UVM_ADV_NORMAL);
659 CTASSERT(POSIX_FADV_RANDOM == UVM_ADV_RANDOM);
660 CTASSERT(POSIX_FADV_SEQUENTIAL == UVM_ADV_SEQUENTIAL);
661
662 if (len == 0) {
663 endoffset = INT64_MAX;
664 } else if (len > 0 && (INT64_MAX - offset) >= len) {
665 endoffset = offset + len;
666 } else {
667 return EINVAL;
668 }
669 if ((fp = fd_getfile(fd)) == NULL) {
670 return EBADF;
671 }
672 if (fp->f_type != DTYPE_VNODE) {
673 if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) {
674 error = ESPIPE;
675 } else {
676 error = EOPNOTSUPP;
677 }
678 fd_putfile(fd);
679 return error;
680 }
681
682 switch (advice) {
683 case POSIX_FADV_WILLNEED:
684 case POSIX_FADV_DONTNEED:
685 vp = fp->f_vnode;
686 if (vp->v_type != VREG && vp->v_type != VBLK) {
687 fd_putfile(fd);
688 return 0;
689 }
690 break;
691 }
692
693 switch (advice) {
694 case POSIX_FADV_NORMAL:
695 case POSIX_FADV_RANDOM:
696 case POSIX_FADV_SEQUENTIAL:
697 /*
698 * We ignore offset and size. Must lock the file to
699 * do this, as f_advice is sub-word sized.
700 */
701 mutex_enter(&fp->f_lock);
702 fp->f_advice = (u_char)advice;
703 mutex_exit(&fp->f_lock);
704 error = 0;
705 break;
706
707 case POSIX_FADV_WILLNEED:
708 vp = fp->f_vnode;
709 error = uvm_readahead(&vp->v_uobj, offset, endoffset - offset);
710 break;
711
712 case POSIX_FADV_DONTNEED:
713 vp = fp->f_vnode;
714 /*
715 * Align the region to page boundaries as VOP_PUTPAGES expects
716 * by shrinking it. We shrink instead of expand because we
717 * do not want to deactivate cache outside of the requested
718 * region. It means that if the specified region is smaller
719 * than PAGE_SIZE, we do nothing.
720 */
721 if (round_page(offset) < trunc_page(endoffset) &&
722 offset <= round_page(offset)) {
723 mutex_enter(vp->v_interlock);
724 error = VOP_PUTPAGES(vp,
725 round_page(offset), trunc_page(endoffset),
726 PGO_DEACTIVATE | PGO_CLEANIT);
727 } else {
728 error = 0;
729 }
730 break;
731
732 case POSIX_FADV_NOREUSE:
733 /* Not implemented yet. */
734 error = 0;
735 break;
736 default:
737 error = EINVAL;
738 break;
739 }
740
741 fd_putfile(fd);
742 return error;
743 }
744
745 int
sys___posix_fadvise50(struct lwp * l,const struct sys___posix_fadvise50_args * uap,register_t * retval)746 sys___posix_fadvise50(struct lwp *l,
747 const struct sys___posix_fadvise50_args *uap,
748 register_t *retval)
749 {
750 /* {
751 syscallarg(int) fd;
752 syscallarg(int) pad;
753 syscallarg(off_t) offset;
754 syscallarg(off_t) len;
755 syscallarg(int) advice;
756 } */
757
758 *retval = do_posix_fadvise(SCARG(uap, fd), SCARG(uap, offset),
759 SCARG(uap, len), SCARG(uap, advice));
760
761 return 0;
762 }
763
764 int
sys_pipe(struct lwp * l,const void * v,register_t * retval)765 sys_pipe(struct lwp *l, const void *v, register_t *retval)
766 {
767 return pipe1(l, retval, 0);
768 }
769
770 int
sys_pipe2(struct lwp * l,const struct sys_pipe2_args * uap,register_t * retval)771 sys_pipe2(struct lwp *l, const struct sys_pipe2_args *uap, register_t *retval)
772 {
773 /* {
774 syscallarg(int[2]) fildes;
775 syscallarg(int) flags;
776 } */
777 int fd[2], error;
778
779 if ((error = pipe1(l, retval, SCARG(uap, flags))) != 0)
780 return error;
781 fd[0] = retval[0];
782 fd[1] = retval[1];
783 if ((error = copyout(fd, SCARG(uap, fildes), sizeof(fd))) != 0)
784 return error;
785 retval[0] = 0;
786 return 0;
787 }
788