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kernel/libc: Remove sigstack() remains.
[dragonfly.git] / sys / kern / sys_generic.c
blobca5a55606bd9300efed93afbc2e00d80cf7faa57
1 /*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/sys_generic.c,v 1.55.2.10 2001/03/17 10:39:32 peter Exp $
36 */
37
38 #include "opt_ktrace.h"
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sysproto.h>
43 #include <sys/event.h>
44 #include <sys/filedesc.h>
45 #include <sys/filio.h>
46 #include <sys/fcntl.h>
47 #include <sys/file.h>
48 #include <sys/proc.h>
49 #include <sys/signalvar.h>
50 #include <sys/socketvar.h>
51 #include <sys/uio.h>
52 #include <sys/kernel.h>
53 #include <sys/kern_syscall.h>
54 #include <sys/malloc.h>
55 #include <sys/mapped_ioctl.h>
56 #include <sys/poll.h>
57 #include <sys/queue.h>
58 #include <sys/resourcevar.h>
59 #include <sys/socketops.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
62 #include <sys/buf.h>
63 #ifdef KTRACE
64 #include <sys/ktrace.h>
65 #endif
66 #include <vm/vm.h>
67 #include <vm/vm_page.h>
68
69 #include <sys/file2.h>
70 #include <sys/spinlock2.h>
71
72 #include <machine/limits.h>
73
74 static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
75 static MALLOC_DEFINE(M_IOCTLMAP, "ioctlmap", "mapped ioctl handler buffer");
76 static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
77 MALLOC_DEFINE(M_IOV, "iov", "large iov's");
78
79 typedef struct kfd_set {
80 fd_mask fds_bits[2];
81 } kfd_set;
82
83 enum select_copyin_states {
84 COPYIN_READ, COPYIN_WRITE, COPYIN_EXCEPT, COPYIN_DONE };
85
86 struct select_kevent_copyin_args {
87 kfd_set *read_set;
88 kfd_set *write_set;
89 kfd_set *except_set;
90 int active_set; /* One of select_copyin_states */
91 struct lwp *lwp; /* Pointer to our lwp */
92 int num_fds; /* Number of file descriptors (syscall arg) */
93 int proc_fds; /* Processed fd's (wraps) */
94 int error; /* Returned to userland */
95 };
96
97 struct poll_kevent_copyin_args {
98 struct lwp *lwp;
99 struct pollfd *fds;
100 int nfds;
101 int pfds;
102 int error;
103 };
104
105 static struct lwkt_token mioctl_token = LWKT_TOKEN_INITIALIZER(mioctl_token);
106
107 static int doselect(int nd, fd_set *in, fd_set *ou, fd_set *ex,
108 struct timespec *ts, int *res);
109 static int dopoll(int nfds, struct pollfd *fds, struct timespec *ts,
110 int *res, int flags);
111 static int dofileread(int, struct file *, struct uio *, int, size_t *);
112 static int dofilewrite(int, struct file *, struct uio *, int, size_t *);
113
114 /*
115 * Read system call.
116 *
117 * MPSAFE
118 */
119 int
120 sys_read(struct read_args *uap)
121 {
122 struct thread *td = curthread;
123 struct uio auio;
124 struct iovec aiov;
125 int error;
126
127 if ((ssize_t)uap->nbyte < 0)
128 error = EINVAL;
129
130 aiov.iov_base = uap->buf;
131 aiov.iov_len = uap->nbyte;
132 auio.uio_iov = &aiov;
133 auio.uio_iovcnt = 1;
134 auio.uio_offset = -1;
135 auio.uio_resid = uap->nbyte;
136 auio.uio_rw = UIO_READ;
137 auio.uio_segflg = UIO_USERSPACE;
138 auio.uio_td = td;
139
140 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
141 return(error);
142 }
143
144 /*
145 * Positioned (Pread) read system call
146 *
147 * MPSAFE
148 */
149 int
150 sys_extpread(struct extpread_args *uap)
151 {
152 struct thread *td = curthread;
153 struct uio auio;
154 struct iovec aiov;
155 int error;
156 int flags;
157
158 if ((ssize_t)uap->nbyte < 0)
159 return(EINVAL);
160
161 aiov.iov_base = uap->buf;
162 aiov.iov_len = uap->nbyte;
163 auio.uio_iov = &aiov;
164 auio.uio_iovcnt = 1;
165 auio.uio_offset = uap->offset;
166 auio.uio_resid = uap->nbyte;
167 auio.uio_rw = UIO_READ;
168 auio.uio_segflg = UIO_USERSPACE;
169 auio.uio_td = td;
170
171 flags = uap->flags & O_FMASK;
172 if (uap->offset != (off_t)-1)
173 flags |= O_FOFFSET;
174
175 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
176 return(error);
177 }
178
179 /*
180 * Scatter read system call.
181 *
182 * MPSAFE
183 */
184 int
185 sys_readv(struct readv_args *uap)
186 {
187 struct thread *td = curthread;
188 struct uio auio;
189 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
190 int error;
191
192 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
193 &auio.uio_resid);
194 if (error)
195 return (error);
196 auio.uio_iov = iov;
197 auio.uio_iovcnt = uap->iovcnt;
198 auio.uio_offset = -1;
199 auio.uio_rw = UIO_READ;
200 auio.uio_segflg = UIO_USERSPACE;
201 auio.uio_td = td;
202
203 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
204
205 iovec_free(&iov, aiov);
206 return (error);
207 }
208
209
210 /*
211 * Scatter positioned read system call.
212 *
213 * MPSAFE
214 */
215 int
216 sys_extpreadv(struct extpreadv_args *uap)
217 {
218 struct thread *td = curthread;
219 struct uio auio;
220 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
221 int error;
222 int flags;
223
224 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
225 &auio.uio_resid);
226 if (error)
227 return (error);
228 auio.uio_iov = iov;
229 auio.uio_iovcnt = uap->iovcnt;
230 auio.uio_offset = uap->offset;
231 auio.uio_rw = UIO_READ;
232 auio.uio_segflg = UIO_USERSPACE;
233 auio.uio_td = td;
234
235 flags = uap->flags & O_FMASK;
236 if (uap->offset != (off_t)-1)
237 flags |= O_FOFFSET;
238
239 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
240
241 iovec_free(&iov, aiov);
242 return(error);
243 }
244
245 /*
246 * MPSAFE
247 */
248 int
249 kern_preadv(int fd, struct uio *auio, int flags, size_t *res)
250 {
251 struct thread *td = curthread;
252 struct file *fp;
253 int error;
254
255 fp = holdfp(td, fd, FREAD);
256 if (fp == NULL)
257 return (EBADF);
258 if (flags & O_FOFFSET && fp->f_type != DTYPE_VNODE) {
259 error = ESPIPE;
260 } else {
261 error = dofileread(fd, fp, auio, flags, res);
262 }
263 dropfp(td, fd, fp);
264
265 return(error);
266 }
267
268 /*
269 * Common code for readv and preadv that reads data in
270 * from a file using the passed in uio, offset, and flags.
271 *
272 * MPALMOSTSAFE - ktrace needs help
273 */
274 static int
275 dofileread(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
276 {
277 int error;
278 size_t len;
279 #ifdef KTRACE
280 struct thread *td = curthread;
281 struct iovec *ktriov = NULL;
282 struct uio ktruio;
283 #endif
284
285 #ifdef KTRACE
286 /*
287 * if tracing, save a copy of iovec
288 */
289 if (KTRPOINT(td, KTR_GENIO)) {
290 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
291
292 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
293 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
294 ktruio = *auio;
295 }
296 #endif
297 len = auio->uio_resid;
298 error = fo_read(fp, auio, fp->f_cred, flags);
299 if (error) {
300 if (auio->uio_resid != len && (error == ERESTART ||
301 error == EINTR || error == EWOULDBLOCK))
302 error = 0;
303 }
304 #ifdef KTRACE
305 if (ktriov != NULL) {
306 if (error == 0) {
307 ktruio.uio_iov = ktriov;
308 ktruio.uio_resid = len - auio->uio_resid;
309 ktrgenio(td->td_lwp, fd, UIO_READ, &ktruio, error);
310 }
311 kfree(ktriov, M_TEMP);
312 }
313 #endif
314 if (error == 0)
315 *res = len - auio->uio_resid;
316
317 return(error);
318 }
319
320 /*
321 * Write system call
322 *
323 * MPSAFE
324 */
325 int
326 sys_write(struct write_args *uap)
327 {
328 struct thread *td = curthread;
329 struct uio auio;
330 struct iovec aiov;
331 int error;
332
333 if ((ssize_t)uap->nbyte < 0)
334 error = EINVAL;
335
336 aiov.iov_base = (void *)(uintptr_t)uap->buf;
337 aiov.iov_len = uap->nbyte;
338 auio.uio_iov = &aiov;
339 auio.uio_iovcnt = 1;
340 auio.uio_offset = -1;
341 auio.uio_resid = uap->nbyte;
342 auio.uio_rw = UIO_WRITE;
343 auio.uio_segflg = UIO_USERSPACE;
344 auio.uio_td = td;
345
346 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
347
348 return(error);
349 }
350
351 /*
352 * Pwrite system call
353 *
354 * MPSAFE
355 */
356 int
357 sys_extpwrite(struct extpwrite_args *uap)
358 {
359 struct thread *td = curthread;
360 struct uio auio;
361 struct iovec aiov;
362 int error;
363 int flags;
364
365 if ((ssize_t)uap->nbyte < 0)
366 error = EINVAL;
367
368 aiov.iov_base = (void *)(uintptr_t)uap->buf;
369 aiov.iov_len = uap->nbyte;
370 auio.uio_iov = &aiov;
371 auio.uio_iovcnt = 1;
372 auio.uio_offset = uap->offset;
373 auio.uio_resid = uap->nbyte;
374 auio.uio_rw = UIO_WRITE;
375 auio.uio_segflg = UIO_USERSPACE;
376 auio.uio_td = td;
377
378 flags = uap->flags & O_FMASK;
379 if (uap->offset != (off_t)-1)
380 flags |= O_FOFFSET;
381 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
382 return(error);
383 }
384
385 /*
386 * MPSAFE
387 */
388 int
389 sys_writev(struct writev_args *uap)
390 {
391 struct thread *td = curthread;
392 struct uio auio;
393 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
394 int error;
395
396 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
397 &auio.uio_resid);
398 if (error)
399 return (error);
400 auio.uio_iov = iov;
401 auio.uio_iovcnt = uap->iovcnt;
402 auio.uio_offset = -1;
403 auio.uio_rw = UIO_WRITE;
404 auio.uio_segflg = UIO_USERSPACE;
405 auio.uio_td = td;
406
407 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
408
409 iovec_free(&iov, aiov);
410 return (error);
411 }
412
413
414 /*
415 * Gather positioned write system call
416 *
417 * MPSAFE
418 */
419 int
420 sys_extpwritev(struct extpwritev_args *uap)
421 {
422 struct thread *td = curthread;
423 struct uio auio;
424 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
425 int error;
426 int flags;
427
428 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
429 &auio.uio_resid);
430 if (error)
431 return (error);
432 auio.uio_iov = iov;
433 auio.uio_iovcnt = uap->iovcnt;
434 auio.uio_offset = uap->offset;
435 auio.uio_rw = UIO_WRITE;
436 auio.uio_segflg = UIO_USERSPACE;
437 auio.uio_td = td;
438
439 flags = uap->flags & O_FMASK;
440 if (uap->offset != (off_t)-1)
441 flags |= O_FOFFSET;
442
443 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
444
445 iovec_free(&iov, aiov);
446 return(error);
447 }
448
449 /*
450 * MPSAFE
451 */
452 int
453 kern_pwritev(int fd, struct uio *auio, int flags, size_t *res)
454 {
455 struct thread *td = curthread;
456 struct file *fp;
457 int error;
458
459 fp = holdfp(td, fd, FWRITE);
460 if (fp == NULL)
461 return (EBADF);
462 else if ((flags & O_FOFFSET) && fp->f_type != DTYPE_VNODE) {
463 error = ESPIPE;
464 } else {
465 error = dofilewrite(fd, fp, auio, flags, res);
466 }
467 dropfp(td, fd, fp);
468
469 return(error);
470 }
471
472 /*
473 * Common code for writev and pwritev that writes data to
474 * a file using the passed in uio, offset, and flags.
475 *
476 * MPALMOSTSAFE - ktrace needs help
477 */
478 static int
479 dofilewrite(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
480 {
481 struct thread *td = curthread;
482 struct lwp *lp = td->td_lwp;
483 int error;
484 size_t len;
485 #ifdef KTRACE
486 struct iovec *ktriov = NULL;
487 struct uio ktruio;
488 #endif
489
490 #ifdef KTRACE
491 /*
492 * if tracing, save a copy of iovec and uio
493 */
494 if (KTRPOINT(td, KTR_GENIO)) {
495 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
496
497 ktriov = kmalloc(iovlen, M_TEMP, M_WAITOK);
498 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
499 ktruio = *auio;
500 }
501 #endif
502 len = auio->uio_resid;
503 error = fo_write(fp, auio, fp->f_cred, flags);
504 if (error) {
505 if (auio->uio_resid != len && (error == ERESTART ||
506 error == EINTR || error == EWOULDBLOCK))
507 error = 0;
508 /* Socket layer is responsible for issuing SIGPIPE. */
509 if (error == EPIPE && fp->f_type != DTYPE_SOCKET)
510 lwpsignal(lp->lwp_proc, lp, SIGPIPE);
511 }
512 #ifdef KTRACE
513 if (ktriov != NULL) {
514 if (error == 0) {
515 ktruio.uio_iov = ktriov;
516 ktruio.uio_resid = len - auio->uio_resid;
517 ktrgenio(lp, fd, UIO_WRITE, &ktruio, error);
518 }
519 kfree(ktriov, M_TEMP);
520 }
521 #endif
522 if (error == 0)
523 *res = len - auio->uio_resid;
524
525 return(error);
526 }
527
528 /*
529 * Ioctl system call
530 *
531 * MPSAFE
532 */
533 int
534 sys_ioctl(struct ioctl_args *uap)
535 {
536 int error;
537
538 error = mapped_ioctl(uap->fd, uap->com, uap->data, NULL, &uap->sysmsg);
539 return (error);
540 }
541
542 struct ioctl_map_entry {
543 const char *subsys;
544 struct ioctl_map_range *cmd_ranges;
545 LIST_ENTRY(ioctl_map_entry) entries;
546 };
547
548 /*
549 * The true heart of all ioctl syscall handlers (native, emulation).
550 * If map != NULL, it will be searched for a matching entry for com,
551 * and appropriate conversions/conversion functions will be utilized.
552 *
553 * MPSAFE
554 */
555 int
556 mapped_ioctl(int fd, u_long com, caddr_t uspc_data, struct ioctl_map *map,
557 struct sysmsg *msg)
558 {
559 struct thread *td = curthread;
560 struct proc *p = td->td_proc;
561 struct ucred *cred;
562 struct file *fp;
563 struct ioctl_map_range *iomc = NULL;
564 int error;
565 u_int size;
566 u_long ocom = com;
567 caddr_t data, memp;
568 int tmp;
569 #define STK_PARAMS 128
570 union {
571 char stkbuf[STK_PARAMS];
572 long align;
573 } ubuf;
574
575 KKASSERT(p);
576 cred = td->td_ucred;
577 memp = NULL;
578
579 fp = holdfp(td, fd, FREAD|FWRITE);
580 if (fp == NULL)
581 return(EBADF);
582
583 if (map != NULL) { /* obey translation map */
584 u_long maskcmd;
585 struct ioctl_map_entry *e;
586
587 maskcmd = com & map->mask;
588
589 lwkt_gettoken(&mioctl_token);
590 LIST_FOREACH(e, &map->mapping, entries) {
591 for (iomc = e->cmd_ranges; iomc->start != 0 ||
592 iomc->maptocmd != 0 || iomc->wrapfunc != NULL ||
593 iomc->mapfunc != NULL;
594 iomc++) {
595 if (maskcmd >= iomc->start &&
596 maskcmd <= iomc->end)
597 break;
598 }
599
600 /* Did we find a match? */
601 if (iomc->start != 0 || iomc->maptocmd != 0 ||
602 iomc->wrapfunc != NULL || iomc->mapfunc != NULL)
603 break;
604 }
605 lwkt_reltoken(&mioctl_token);
606
607 if (iomc == NULL ||
608 (iomc->start == 0 && iomc->maptocmd == 0
609 && iomc->wrapfunc == NULL && iomc->mapfunc == NULL)) {
610 kprintf("%s: 'ioctl' fd=%d, cmd=0x%lx ('%c',%d) not implemented\n",
611 map->sys, fd, maskcmd,
612 (int)((maskcmd >> 8) & 0xff),
613 (int)(maskcmd & 0xff));
614 error = EINVAL;
615 goto done;
616 }
617
618 /*
619 * If it's a non-range one to one mapping, maptocmd should be
620 * correct. If it's a ranged one to one mapping, we pass the
621 * original value of com, and for a range mapped to a different
622 * range, we always need a mapping function to translate the
623 * ioctl to our native ioctl. Ex. 6500-65ff <-> 9500-95ff
624 */
625 if (iomc->start == iomc->end && iomc->maptocmd == iomc->maptoend) {
626 com = iomc->maptocmd;
627 } else if (iomc->start == iomc->maptocmd && iomc->end == iomc->maptoend) {
628 if (iomc->mapfunc != NULL)
629 com = iomc->mapfunc(iomc->start, iomc->end,
630 iomc->start, iomc->end,
631 com, com);
632 } else {
633 if (iomc->mapfunc != NULL) {
634 com = iomc->mapfunc(iomc->start, iomc->end,
635 iomc->maptocmd, iomc->maptoend,
636 com, ocom);
637 } else {
638 kprintf("%s: Invalid mapping for fd=%d, cmd=%#lx ('%c',%d)\n",
639 map->sys, fd, maskcmd,
640 (int)((maskcmd >> 8) & 0xff),
641 (int)(maskcmd & 0xff));
642 error = EINVAL;
643 goto done;
644 }
645 }
646 }
647
648 switch (com) {
649 case FIONCLEX:
650 error = fclrfdflags(p->p_fd, fd, UF_EXCLOSE);
651 goto done;
652 case FIOCLEX:
653 error = fsetfdflags(p->p_fd, fd, UF_EXCLOSE);
654 goto done;
655 }
656
657 /*
658 * Interpret high order word to find amount of data to be
659 * copied to/from the user's address space.
660 */
661 size = IOCPARM_LEN(com);
662 if (size > IOCPARM_MAX) {
663 error = ENOTTY;
664 goto done;
665 }
666
667 if ((com & IOC_VOID) == 0 && size > sizeof(ubuf.stkbuf)) {
668 memp = kmalloc(size, M_IOCTLOPS, M_WAITOK);
669 data = memp;
670 } else {
671 memp = NULL;
672 data = ubuf.stkbuf;
673 }
674 if (com & IOC_VOID) {
675 *(caddr_t *)data = uspc_data;
676 } else if (com & IOC_IN) {
677 if (size != 0) {
678 error = copyin(uspc_data, data, (size_t)size);
679 if (error)
680 goto done;
681 } else {
682 *(caddr_t *)data = uspc_data;
683 }
684 } else if ((com & IOC_OUT) != 0 && size) {
685 /*
686 * Zero the buffer so the user always
687 * gets back something deterministic.
688 */
689 bzero(data, (size_t)size);
690 }
691
692 switch (com) {
693 case FIONBIO:
694 if ((tmp = *(int *)data))
695 atomic_set_int(&fp->f_flag, FNONBLOCK);
696 else
697 atomic_clear_int(&fp->f_flag, FNONBLOCK);
698 error = 0;
699 break;
700
701 case FIOASYNC:
702 if ((tmp = *(int *)data))
703 atomic_set_int(&fp->f_flag, FASYNC);
704 else
705 atomic_clear_int(&fp->f_flag, FASYNC);
706 error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, cred, msg);
707 break;
708
709 default:
710 /*
711 * If there is a override function,
712 * call it instead of directly routing the call
713 */
714 if (map != NULL && iomc->wrapfunc != NULL)
715 error = iomc->wrapfunc(fp, com, ocom, data, cred);
716 else
717 error = fo_ioctl(fp, com, data, cred, msg);
718 /*
719 * Copy any data to user, size was
720 * already set and checked above.
721 */
722 if (error == 0 && (com & IOC_OUT) != 0 && size != 0)
723 error = copyout(data, uspc_data, (size_t)size);
724 break;
725 }
726 done:
727 if (memp != NULL)
728 kfree(memp, M_IOCTLOPS);
729 dropfp(td, fd, fp);
730
731 return(error);
732 }
733
734 /*
735 * MPSAFE
736 */
737 int
738 mapped_ioctl_register_handler(struct ioctl_map_handler *he)
739 {
740 struct ioctl_map_entry *ne;
741
742 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL &&
743 he->subsys != NULL && *he->subsys != '\0');
744
745 ne = kmalloc(sizeof(struct ioctl_map_entry), M_IOCTLMAP,
746 M_WAITOK | M_ZERO);
747
748 ne->subsys = he->subsys;
749 ne->cmd_ranges = he->cmd_ranges;
750
751 lwkt_gettoken(&mioctl_token);
752 LIST_INSERT_HEAD(&he->map->mapping, ne, entries);
753 lwkt_reltoken(&mioctl_token);
754
755 return(0);
756 }
757
758 /*
759 * MPSAFE
760 */
761 int
762 mapped_ioctl_unregister_handler(struct ioctl_map_handler *he)
763 {
764 struct ioctl_map_entry *ne;
765 int error = EINVAL;
766
767 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL);
768
769 lwkt_gettoken(&mioctl_token);
770 LIST_FOREACH(ne, &he->map->mapping, entries) {
771 if (ne->cmd_ranges == he->cmd_ranges) {
772 LIST_REMOVE(ne, entries);
773 kfree(ne, M_IOCTLMAP);
774 error = 0;
775 break;
776 }
777 }
778 lwkt_reltoken(&mioctl_token);
779 return(error);
780 }
781
782 static int nselcoll; /* Select collisions since boot */
783 int selwait;
784 SYSCTL_INT(_kern, OID_AUTO, nselcoll, CTLFLAG_RD, &nselcoll, 0, "");
785 static int nseldebug;
786 SYSCTL_INT(_kern, OID_AUTO, nseldebug, CTLFLAG_RW, &nseldebug, 0, "");
787
788 /*
789 * Select system call.
790 *
791 * MPSAFE
792 */
793 int
794 sys_select(struct select_args *uap)
795 {
796 struct timeval ktv;
797 struct timespec *ktsp, kts;
798 int error;
799
800 /*
801 * Get timeout if any.
802 */
803 if (uap->tv != NULL) {
804 error = copyin(uap->tv, &ktv, sizeof (ktv));
805 if (error)
806 return (error);
807 TIMEVAL_TO_TIMESPEC(&ktv, &kts);
808 ktsp = &kts;
809 } else {
810 ktsp = NULL;
811 }
812
813 /*
814 * Do real work.
815 */
816 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp,
817 &uap->sysmsg_result);
818
819 return (error);
820 }
821
822
823 /*
824 * Pselect system call.
825 */
826 int
827 sys_pselect(struct pselect_args *uap)
828 {
829 struct thread *td = curthread;
830 struct lwp *lp = td->td_lwp;
831 struct timespec *ktsp, kts;
832 sigset_t sigmask;
833 int error;
834
835 /*
836 * Get timeout if any.
837 */
838 if (uap->ts != NULL) {
839 error = copyin(uap->ts, &kts, sizeof (kts));
840 if (error)
841 return (error);
842 ktsp = &kts;
843 } else {
844 ktsp = NULL;
845 }
846
847 /*
848 * Install temporary signal mask if any provided.
849 */
850 if (uap->sigmask != NULL) {
851 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask));
852 if (error)
853 return (error);
854 lwkt_gettoken(&lp->lwp_proc->p_token);
855 lp->lwp_oldsigmask = lp->lwp_sigmask;
856 SIG_CANTMASK(sigmask);
857 lp->lwp_sigmask = sigmask;
858 lwkt_reltoken(&lp->lwp_proc->p_token);
859 }
860
861 /*
862 * Do real job.
863 */
864 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktsp,
865 &uap->sysmsg_result);
866
867 if (uap->sigmask != NULL) {
868 lwkt_gettoken(&lp->lwp_proc->p_token);
869 /* doselect() responsible for turning ERESTART into EINTR */
870 KKASSERT(error != ERESTART);
871 if (error == EINTR) {
872 /*
873 * We can't restore the previous signal mask now
874 * because it could block the signal that interrupted
875 * us. So make a note to restore it after executing
876 * the handler.
877 */
878 lp->lwp_flags |= LWP_OLDMASK;
879 } else {
880 /*
881 * No handler to run. Restore previous mask immediately.
882 */
883 lp->lwp_sigmask = lp->lwp_oldsigmask;
884 }
885 lwkt_reltoken(&lp->lwp_proc->p_token);
886 }
887
888 return (error);
889 }
890
891 static int
892 select_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
893 {
894 struct select_kevent_copyin_args *skap = NULL;
895 struct kevent *kev;
896 int fd;
897 kfd_set *fdp = NULL;
898 short filter = 0;
899 u_int fflags = 0;
900
901 skap = (struct select_kevent_copyin_args *)arg;
902
903 if (*events == maxevents)
904 return (0);
905
906 while (skap->active_set < COPYIN_DONE) {
907 switch (skap->active_set) {
908 case COPYIN_READ:
909 /*
910 * Register descriptors for the read filter
911 */
912 fdp = skap->read_set;
913 filter = EVFILT_READ;
914 fflags = NOTE_OLDAPI;
915 if (fdp)
916 break;
917 ++skap->active_set;
918 skap->proc_fds = 0;
919 /* fall through */
920 case COPYIN_WRITE:
921 /*
922 * Register descriptors for the write filter
923 */
924 fdp = skap->write_set;
925 filter = EVFILT_WRITE;
926 fflags = NOTE_OLDAPI;
927 if (fdp)
928 break;
929 ++skap->active_set;
930 skap->proc_fds = 0;
931 /* fall through */
932 case COPYIN_EXCEPT:
933 /*
934 * Register descriptors for the exception filter
935 */
936 fdp = skap->except_set;
937 filter = EVFILT_EXCEPT;
938 fflags = NOTE_OLDAPI | NOTE_OOB;
939 if (fdp)
940 break;
941 ++skap->active_set;
942 skap->proc_fds = 0;
943 /* fall through */
944 case COPYIN_DONE:
945 /*
946 * Nothing left to register
947 */
948 return(0);
949 /* NOT REACHED */
950 }
951
952 while (skap->proc_fds < skap->num_fds) {
953 fd = skap->proc_fds;
954 if (FD_ISSET(fd, fdp)) {
955 kev = &kevp[*events];
956 EV_SET(kev, fd, filter,
957 EV_ADD|EV_ENABLE,
958 fflags, 0,
959 (void *)(uintptr_t)
960 skap->lwp->lwp_kqueue_serial);
961 FD_CLR(fd, fdp);
962 ++*events;
963
964 if (nseldebug) {
965 kprintf("select fd %d filter %d "
966 "serial %ju\n", fd, filter,
967 (uintmax_t)
968 skap->lwp->lwp_kqueue_serial);
969 }
970 }
971 ++skap->proc_fds;
972 if (*events == maxevents)
973 return (0);
974 }
975 skap->active_set++;
976 skap->proc_fds = 0;
977 }
978
979 return (0);
980 }
981
982 static int
983 select_copyout(void *arg, struct kevent *kevp, int count, int *res)
984 {
985 struct select_kevent_copyin_args *skap;
986 struct kevent kev;
987 int i;
988 int n;
989
990 skap = (struct select_kevent_copyin_args *)arg;
991
992 for (i = 0; i < count; ++i) {
993 /*
994 * Filter out and delete spurious events
995 */
996 if ((uint64_t)(uintptr_t)kevp[i].udata !=
997 skap->lwp->lwp_kqueue_serial) {
998 kev = kevp[i];
999 kev.flags = EV_DISABLE|EV_DELETE;
1000 n = 1;
1001 kqueue_register(&skap->lwp->lwp_kqueue, &kev, &n);
1002 if (nseldebug) {
1003 kprintf("select fd %ju mismatched serial %ju\n",
1004 (uintmax_t)kevp[i].ident,
1005 (uintmax_t)skap->lwp->lwp_kqueue_serial);
1006 }
1007 continue;
1008 }
1009
1010 /*
1011 * Handle errors
1012 */
1013 if (kevp[i].flags & EV_ERROR) {
1014 int error = kevp[i].data;
1015
1016 switch (error) {
1017 case EBADF:
1018 /*
1019 * A bad file descriptor is considered a
1020 * fatal error for select, bail out.
1021 */
1022 skap->error = error;
1023 *res = -1;
1024 return error;
1025
1026 default:
1027 /*
1028 * Select silently swallows any unknown errors
1029 * for descriptors in the read or write sets.
1030 *
1031 * ALWAYS filter out EOPNOTSUPP errors from
1032 * filters (at least until all filters support
1033 * EVFILT_EXCEPT)
1034 *
1035 * We also filter out ENODEV since dev_dkqfilter
1036 * returns ENODEV if EOPNOTSUPP is returned in an
1037 * inner call.
1038 *
1039 * XXX: fix this
1040 */
1041 if (kevp[i].filter != EVFILT_READ &&
1042 kevp[i].filter != EVFILT_WRITE &&
1043 error != EOPNOTSUPP &&
1044 error != ENODEV) {
1045 skap->error = error;
1046 *res = -1;
1047 return error;
1048 }
1049 break;
1050 }
1051 if (nseldebug)
1052 kprintf("select fd %ju filter %d error %d\n",
1053 (uintmax_t)kevp[i].ident,
1054 kevp[i].filter, error);
1055 continue;
1056 }
1057
1058 switch (kevp[i].filter) {
1059 case EVFILT_READ:
1060 FD_SET(kevp[i].ident, skap->read_set);
1061 break;
1062 case EVFILT_WRITE:
1063 FD_SET(kevp[i].ident, skap->write_set);
1064 break;
1065 case EVFILT_EXCEPT:
1066 FD_SET(kevp[i].ident, skap->except_set);
1067 break;
1068 }
1069
1070 ++*res;
1071 }
1072
1073 return (0);
1074 }
1075
1076 /*
1077 * Copy select bits in from userland. Allocate kernel memory if the
1078 * set is large.
1079 */
1080 static int
1081 getbits(int bytes, fd_set *in_set, kfd_set **out_set, kfd_set *tmp_set)
1082 {
1083 int error;
1084
1085 if (in_set) {
1086 if (bytes < sizeof(*tmp_set))
1087 *out_set = tmp_set;
1088 else
1089 *out_set = kmalloc(bytes, M_SELECT, M_WAITOK);
1090 error = copyin(in_set, *out_set, bytes);
1091 } else {
1092 *out_set = NULL;
1093 error = 0;
1094 }
1095 return (error);
1096 }
1097
1098 /*
1099 * Copy returned select bits back out to userland.
1100 */
1101 static int
1102 putbits(int bytes, kfd_set *in_set, fd_set *out_set)
1103 {
1104 int error;
1105
1106 if (in_set) {
1107 error = copyout(in_set, out_set, bytes);
1108 } else {
1109 error = 0;
1110 }
1111 return (error);
1112 }
1113
1114 static int
1115 dotimeout_only(struct timespec *ts)
1116 {
1117 return(nanosleep1(ts, NULL));
1118 }
1119
1120 /*
1121 * Common code for sys_select() and sys_pselect().
1122 *
1123 * in, out and ex are userland pointers. ts must point to validated
1124 * kernel-side timeout value or NULL for infinite timeout. res must
1125 * point to syscall return value.
1126 */
1127 static int
1128 doselect(int nd, fd_set *read, fd_set *write, fd_set *except,
1129 struct timespec *ts, int *res)
1130 {
1131 struct proc *p = curproc;
1132 struct select_kevent_copyin_args *kap, ka;
1133 int bytes, error;
1134 kfd_set read_tmp;
1135 kfd_set write_tmp;
1136 kfd_set except_tmp;
1137
1138 *res = 0;
1139 if (nd < 0)
1140 return (EINVAL);
1141 if (nd == 0 && ts)
1142 return (dotimeout_only(ts));
1143
1144 if (nd > p->p_fd->fd_nfiles) /* limit kmalloc */
1145 nd = p->p_fd->fd_nfiles;
1146
1147 kap = &ka;
1148 kap->lwp = curthread->td_lwp;
1149 kap->num_fds = nd;
1150 kap->proc_fds = 0;
1151 kap->error = 0;
1152 kap->active_set = COPYIN_READ;
1153
1154 /*
1155 * Calculate bytes based on the number of __fd_mask[] array entries
1156 * multiplied by the size of __fd_mask.
1157 */
1158 bytes = howmany(nd, __NFDBITS) * sizeof(__fd_mask);
1159
1160 /* kap->read_set = NULL; not needed */
1161 kap->write_set = NULL;
1162 kap->except_set = NULL;
1163
1164 error = getbits(bytes, read, &kap->read_set, &read_tmp);
1165 if (error == 0)
1166 error = getbits(bytes, write, &kap->write_set, &write_tmp);
1167 if (error == 0)
1168 error = getbits(bytes, except, &kap->except_set, &except_tmp);
1169 if (error)
1170 goto done;
1171
1172 /*
1173 * NOTE: Make sure the max events passed to kern_kevent() is
1174 * effectively unlimited. (nd * 3) accomplishes this.
1175 *
1176 * (*res) continues to increment as returned events are
1177 * loaded in.
1178 */
1179 error = kern_kevent(&kap->lwp->lwp_kqueue, 0x7FFFFFFF, res, kap,
1180 select_copyin, select_copyout, ts, 0);
1181 if (error == 0)
1182 error = putbits(bytes, kap->read_set, read);
1183 if (error == 0)
1184 error = putbits(bytes, kap->write_set, write);
1185 if (error == 0)
1186 error = putbits(bytes, kap->except_set, except);
1187
1188 /*
1189 * An error from an individual event that should be passed
1190 * back to userland (EBADF)
1191 */
1192 if (kap->error)
1193 error = kap->error;
1194
1195 /*
1196 * Clean up.
1197 */
1198 done:
1199 if (kap->read_set && kap->read_set != &read_tmp)
1200 kfree(kap->read_set, M_SELECT);
1201 if (kap->write_set && kap->write_set != &write_tmp)
1202 kfree(kap->write_set, M_SELECT);
1203 if (kap->except_set && kap->except_set != &except_tmp)
1204 kfree(kap->except_set, M_SELECT);
1205
1206 kap->lwp->lwp_kqueue_serial += kap->num_fds;
1207
1208 return (error);
1209 }
1210
1211 /*
1212 * Poll system call.
1213 *
1214 * MPSAFE
1215 */
1216 int
1217 sys_poll(struct poll_args *uap)
1218 {
1219 struct timespec ts, *tsp;
1220 int error;
1221
1222 if (uap->timeout != INFTIM) {
1223 if (uap->timeout < 0)
1224 return (EINVAL);
1225 ts.tv_sec = uap->timeout / 1000;
1226 ts.tv_nsec = (uap->timeout % 1000) * 1000 * 1000;
1227 tsp = &ts;
1228 } else {
1229 tsp = NULL;
1230 }
1231
1232 error = dopoll(uap->nfds, uap->fds, tsp, &uap->sysmsg_result, 0);
1233
1234 return (error);
1235 }
1236
1237 /*
1238 * Ppoll system call.
1239 *
1240 * MPSAFE
1241 */
1242 int
1243 sys_ppoll(struct ppoll_args *uap)
1244 {
1245 struct thread *td = curthread;
1246 struct lwp *lp = td->td_lwp;
1247 struct timespec *ktsp, kts;
1248 sigset_t sigmask;
1249 int error;
1250
1251 /*
1252 * Get timeout if any.
1253 */
1254 if (uap->ts != NULL) {
1255 error = copyin(uap->ts, &kts, sizeof (kts));
1256 if (error)
1257 return (error);
1258 ktsp = &kts;
1259 } else {
1260 ktsp = NULL;
1261 }
1262
1263 /*
1264 * Install temporary signal mask if any provided.
1265 */
1266 if (uap->sigmask != NULL) {
1267 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask));
1268 if (error)
1269 return (error);
1270 lwkt_gettoken(&lp->lwp_proc->p_token);
1271 lp->lwp_oldsigmask = lp->lwp_sigmask;
1272 SIG_CANTMASK(sigmask);
1273 lp->lwp_sigmask = sigmask;
1274 lwkt_reltoken(&lp->lwp_proc->p_token);
1275 }
1276
1277 error = dopoll(uap->nfds, uap->fds, ktsp, &uap->sysmsg_result,
1278 ktsp != NULL ? KEVENT_TIMEOUT_PRECISE : 0);
1279
1280 if (uap->sigmask != NULL) {
1281 lwkt_gettoken(&lp->lwp_proc->p_token);
1282 /* dopoll() responsible for turning ERESTART into EINTR */
1283 KKASSERT(error != ERESTART);
1284 if (error == EINTR) {
1285 /*
1286 * We can't restore the previous signal mask now
1287 * because it could block the signal that interrupted
1288 * us. So make a note to restore it after executing
1289 * the handler.
1290 */
1291 lp->lwp_flags |= LWP_OLDMASK;
1292 } else {
1293 /*
1294 * No handler to run. Restore previous mask immediately.
1295 */
1296 lp->lwp_sigmask = lp->lwp_oldsigmask;
1297 }
1298 lwkt_reltoken(&lp->lwp_proc->p_token);
1299 }
1300
1301 return (error);
1302 }
1303
1304 static int
1305 poll_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
1306 {
1307 struct poll_kevent_copyin_args *pkap;
1308 struct pollfd *pfd;
1309 struct kevent *kev;
1310 int kev_count;
1311
1312 pkap = (struct poll_kevent_copyin_args *)arg;
1313
1314 while (pkap->pfds < pkap->nfds) {
1315 pfd = &pkap->fds[pkap->pfds];
1316
1317 /* Clear return events */
1318 pfd->revents = 0;
1319
1320 /* Do not check if fd is equal to -1 */
1321 if (pfd->fd == -1) {
1322 ++pkap->pfds;
1323 continue;
1324 }
1325
1326 kev_count = 0;
1327 if (pfd->events & (POLLIN | POLLRDNORM))
1328 kev_count++;
1329 if (pfd->events & (POLLOUT | POLLWRNORM))
1330 kev_count++;
1331 if (pfd->events & (POLLPRI | POLLRDBAND))
1332 kev_count++;
1333
1334 if (*events + kev_count > maxevents)
1335 return (0);
1336
1337 /*
1338 * NOTE: A combined serial number and poll array index is
1339 * stored in kev->udata.
1340 */
1341 kev = &kevp[*events];
1342 if (pfd->events & (POLLIN | POLLRDNORM)) {
1343 EV_SET(kev++, pfd->fd, EVFILT_READ, EV_ADD|EV_ENABLE,
1344 NOTE_OLDAPI, 0, (void *)(uintptr_t)
1345 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1346 }
1347 if (pfd->events & (POLLOUT | POLLWRNORM)) {
1348 EV_SET(kev++, pfd->fd, EVFILT_WRITE, EV_ADD|EV_ENABLE,
1349 NOTE_OLDAPI, 0, (void *)(uintptr_t)
1350 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1351 }
1352 if (pfd->events & (POLLPRI | POLLRDBAND)) {
1353 EV_SET(kev++, pfd->fd, EVFILT_EXCEPT, EV_ADD|EV_ENABLE,
1354 NOTE_OLDAPI | NOTE_OOB, 0,
1355 (void *)(uintptr_t)
1356 (pkap->lwp->lwp_kqueue_serial + pkap->pfds));
1357 }
1358
1359 if (nseldebug) {
1360 kprintf("poll index %d/%d fd %d events %08x "
1361 "serial %ju\n", pkap->pfds, pkap->nfds-1,
1362 pfd->fd, pfd->events,
1363 (uintmax_t)pkap->lwp->lwp_kqueue_serial);
1364 }
1365
1366 ++pkap->pfds;
1367 (*events) += kev_count;
1368 }
1369
1370 return (0);
1371 }
1372
1373 static int
1374 poll_copyout(void *arg, struct kevent *kevp, int count, int *res)
1375 {
1376 struct poll_kevent_copyin_args *pkap;
1377 struct pollfd *pfd;
1378 struct kevent kev;
1379 int count_res;
1380 int i;
1381 int n;
1382 uint64_t pi;
1383
1384 pkap = (struct poll_kevent_copyin_args *)arg;
1385
1386 for (i = 0; i < count; ++i) {
1387 /*
1388 * Extract the poll array index and delete spurious events.
1389 * We can easily tell if the serial number is incorrect
1390 * by checking whether the extracted index is out of range.
1391 */
1392 pi = (uint64_t)(uintptr_t)kevp[i].udata -
1393 pkap->lwp->lwp_kqueue_serial;
1394
1395 if (pi >= pkap->nfds) {
1396 kev = kevp[i];
1397 kev.flags = EV_DISABLE|EV_DELETE;
1398 n = 1;
1399 kqueue_register(&pkap->lwp->lwp_kqueue, &kev, &n);
1400 if (nseldebug) {
1401 kprintf("poll index %ju out of range against "
1402 "serial %ju\n", (uintmax_t)pi,
1403 (uintmax_t)pkap->lwp->lwp_kqueue_serial);
1404 }
1405 continue;
1406 }
1407 pfd = &pkap->fds[pi];
1408 if (kevp[i].ident == pfd->fd) {
1409 /*
1410 * A single descriptor may generate an error against
1411 * more than one filter, make sure to set the
1412 * appropriate flags but do not increment (*res)
1413 * more than once.
1414 */
1415 count_res = (pfd->revents == 0);
1416 if (kevp[i].flags & EV_ERROR) {
1417 switch(kevp[i].data) {
1418 case EBADF:
1419 case POLLNVAL:
1420 /* Bad file descriptor */
1421 if (count_res)
1422 ++*res;
1423 pfd->revents |= POLLNVAL;
1424 break;
1425 default:
1426 /*
1427 * Poll silently swallows any unknown
1428 * errors except in the case of POLLPRI
1429 * (OOB/urgent data).
1430 *
1431 * ALWAYS filter out EOPNOTSUPP errors
1432 * from filters, common applications
1433 * set POLLPRI|POLLRDBAND and most
1434 * filters do not support EVFILT_EXCEPT.
1435 *
1436 * We also filter out ENODEV since dev_dkqfilter
1437 * returns ENODEV if EOPNOTSUPP is returned in an
1438 * inner call.
1439 *
1440 * XXX: fix this
1441 */
1442 if (kevp[i].filter != EVFILT_READ &&
1443 kevp[i].filter != EVFILT_WRITE &&
1444 kevp[i].data != EOPNOTSUPP &&
1445 kevp[i].data != ENODEV) {
1446 if (count_res)
1447 ++*res;
1448 pfd->revents |= POLLERR;
1449 }
1450 break;
1451 }
1452 if (nseldebug) {
1453 kprintf("poll index %ju fd %d "
1454 "filter %d error %jd\n",
1455 (uintmax_t)pi, pfd->fd,
1456 kevp[i].filter,
1457 (intmax_t)kevp[i].data);
1458 }
1459 continue;
1460 }
1461
1462 switch (kevp[i].filter) {
1463 case EVFILT_READ:
1464 #if 0
1465 /*
1466 * NODATA on the read side can indicate a
1467 * half-closed situation and not necessarily
1468 * a disconnect, so depend on the user
1469 * issuing a read() and getting 0 bytes back.
1470 */
1471 if (kevp[i].flags & EV_NODATA)
1472 pfd->revents |= POLLHUP;
1473 #endif
1474 if ((kevp[i].flags & EV_EOF) &&
1475 kevp[i].fflags != 0)
1476 pfd->revents |= POLLERR;
1477 if (pfd->events & POLLIN)
1478 pfd->revents |= POLLIN;
1479 if (pfd->events & POLLRDNORM)
1480 pfd->revents |= POLLRDNORM;
1481 break;
1482 case EVFILT_WRITE:
1483 /*
1484 * As per the OpenGroup POLLHUP is mutually
1485 * exclusive with the writability flags. I
1486 * consider this a bit broken but...
1487 *
1488 * In this case a disconnect is implied even
1489 * for a half-closed (write side) situation.
1490 */
1491 if (kevp[i].flags & EV_EOF) {
1492 pfd->revents |= POLLHUP;
1493 if (kevp[i].fflags != 0)
1494 pfd->revents |= POLLERR;
1495 } else {
1496 if (pfd->events & POLLOUT)
1497 pfd->revents |= POLLOUT;
1498 if (pfd->events & POLLWRNORM)
1499 pfd->revents |= POLLWRNORM;
1500 }
1501 break;
1502 case EVFILT_EXCEPT:
1503 /*
1504 * EV_NODATA should never be tagged for this
1505 * filter.
1506 */
1507 if (pfd->events & POLLPRI)
1508 pfd->revents |= POLLPRI;
1509 if (pfd->events & POLLRDBAND)
1510 pfd->revents |= POLLRDBAND;
1511 break;
1512 }
1513
1514 if (nseldebug) {
1515 kprintf("poll index %ju/%d fd %d "
1516 "revents %08x\n", (uintmax_t)pi, pkap->nfds,
1517 pfd->fd, pfd->revents);
1518 }
1519
1520 if (count_res && pfd->revents)
1521 ++*res;
1522 } else {
1523 if (nseldebug) {
1524 kprintf("poll index %ju mismatch %ju/%d\n",
1525 (uintmax_t)pi, (uintmax_t)kevp[i].ident,
1526 pfd->fd);
1527 }
1528 }
1529 }
1530
1531 return (0);
1532 }
1533
1534 static int
1535 dopoll(int nfds, struct pollfd *fds, struct timespec *ts, int *res, int flags)
1536 {
1537 struct poll_kevent_copyin_args ka;
1538 struct pollfd sfds[64];
1539 int bytes;
1540 int error;
1541
1542 *res = 0;
1543 if (nfds < 0)
1544 return (EINVAL);
1545
1546 if (nfds == 0 && ts)
1547 return (dotimeout_only(ts));
1548
1549 /*
1550 * This is a bit arbitrary but we need to limit internal kmallocs.
1551 */
1552 if (nfds > maxfilesperproc * 2)
1553 nfds = maxfilesperproc * 2;
1554 bytes = sizeof(struct pollfd) * nfds;
1555
1556 ka.lwp = curthread->td_lwp;
1557 ka.nfds = nfds;
1558 ka.pfds = 0;
1559 ka.error = 0;
1560
1561 if (ka.nfds < 64)
1562 ka.fds = sfds;
1563 else
1564 ka.fds = kmalloc(bytes, M_SELECT, M_WAITOK);
1565
1566 error = copyin(fds, ka.fds, bytes);
1567 if (error == 0)
1568 error = kern_kevent(&ka.lwp->lwp_kqueue, 0x7FFFFFFF, res, &ka,
1569 poll_copyin, poll_copyout, ts, flags);
1570
1571 if (error == 0)
1572 error = copyout(ka.fds, fds, bytes);
1573
1574 if (ka.fds != sfds)
1575 kfree(ka.fds, M_SELECT);
1576
1577 ka.lwp->lwp_kqueue_serial += nfds;
1578
1579 return (error);
1580 }
1581
1582 static int
1583 socket_wait_copyin(void *arg, struct kevent *kevp, int maxevents, int *events)
1584 {
1585 return (0);
1586 }
1587
1588 static int
1589 socket_wait_copyout(void *arg, struct kevent *kevp, int count, int *res)
1590 {
1591 ++*res;
1592 return (0);
1593 }
1594
1595 extern struct fileops socketops;
1596
1597 /*
1598 * NOTE: Callers of socket_wait() must already have a reference on the
1599 * socket.
1600 */
1601 int
1602 socket_wait(struct socket *so, struct timespec *ts, int *res)
1603 {
1604 struct thread *td = curthread;
1605 struct file *fp;
1606 struct kqueue kq;
1607 struct kevent kev;
1608 int error, fd;
1609 int n;
1610
1611 if ((error = falloc(td->td_lwp, &fp, &fd)) != 0)
1612 return (error);
1613
1614 fp->f_type = DTYPE_SOCKET;
1615 fp->f_flag = FREAD | FWRITE;
1616 fp->f_ops = &socketops;
1617 fp->f_data = so;
1618 fsetfd(td->td_lwp->lwp_proc->p_fd, fp, fd);
1619 fsetfdflags(td->td_proc->p_fd, fd, UF_EXCLOSE);
1620
1621 bzero(&kq, sizeof(kq));
1622 kqueue_init(&kq, td->td_lwp->lwp_proc->p_fd);
1623 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, NULL);
1624 n = 1;
1625 if ((error = kqueue_register(&kq, &kev, &n)) != 0) {
1626 fdrop(fp);
1627 return (error);
1628 }
1629
1630 error = kern_kevent(&kq, 1, res, NULL, socket_wait_copyin,
1631 socket_wait_copyout, ts, 0);
1632
1633 EV_SET(&kev, fd, EVFILT_READ, EV_DELETE|EV_DISABLE, 0, 0, NULL);
1634 n = 1;
1635 kqueue_register(&kq, &kev, &n);
1636 fp->f_ops = &badfileops;
1637 fdrop(fp);
1638
1639 return (error);
1640 }
1641
1642 /*
1643 * OpenBSD poll system call.
1644 * XXX this isn't quite a true representation.. OpenBSD uses select ops.
1645 *
1646 * MPSAFE
1647 */
1648 int
1649 sys_openbsd_poll(struct openbsd_poll_args *uap)
1650 {
1651 return (sys_poll((struct poll_args *)uap));
1652 }
1653
1654 /*ARGSUSED*/
1655 int
1656 seltrue(cdev_t dev, int events)
1657 {
1658 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
1659 }
DragonFly BSD