AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / kern / sys_generic.c
CommitLineData
984263bc
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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. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/sys_generic.c,v 1.55.2.10 2001/03/17 10:39:32 peter Exp $
2494f282 40 * $DragonFly: src/sys/kern/sys_generic.c,v 1.49 2008/05/05 22:09:44 dillon Exp $
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41 */
42
43#include "opt_ktrace.h"
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/sysproto.h>
48#include <sys/filedesc.h>
49#include <sys/filio.h>
50#include <sys/fcntl.h>
51#include <sys/file.h>
52#include <sys/proc.h>
53#include <sys/signalvar.h>
54#include <sys/socketvar.h>
55#include <sys/uio.h>
56#include <sys/kernel.h>
ba023347 57#include <sys/kern_syscall.h>
984263bc 58#include <sys/malloc.h>
a0c5fc96 59#include <sys/mapped_ioctl.h>
984263bc 60#include <sys/poll.h>
a0c5fc96 61#include <sys/queue.h>
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62#include <sys/resourcevar.h>
63#include <sys/sysctl.h>
64#include <sys/sysent.h>
65#include <sys/buf.h>
66#ifdef KTRACE
67#include <sys/ktrace.h>
68#endif
69#include <vm/vm.h>
70#include <vm/vm_page.h>
dadab5e9 71#include <sys/file2.h>
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72
73#include <machine/limits.h>
74
75static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
a0c5fc96 76static MALLOC_DEFINE(M_IOCTLMAP, "ioctlmap", "mapped ioctl handler buffer");
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77static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
78MALLOC_DEFINE(M_IOV, "iov", "large iov's");
79
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80static int doselect(int nd, fd_set *in, fd_set *ou, fd_set *ex,
81 struct timeval *tv, int *res);
402ed7e1
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82static int pollscan (struct proc *, struct pollfd *, u_int, int *);
83static int selscan (struct proc *, fd_mask **, fd_mask **,
84 int, int *);
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85static int dofileread(int, struct file *, struct uio *, int, size_t *);
86static int dofilewrite(int, struct file *, struct uio *, int, size_t *);
7f83ed38 87
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88/*
89 * Read system call.
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90 *
91 * MPSAFE
984263bc 92 */
984263bc 93int
753fd850 94sys_read(struct read_args *uap)
984263bc 95{
dadab5e9 96 struct thread *td = curthread;
ba023347
DRJ
97 struct uio auio;
98 struct iovec aiov;
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99 int error;
100
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MD
101 if ((ssize_t)uap->nbyte < 0)
102 error = EINVAL;
103
ba023347
DRJ
104 aiov.iov_base = uap->buf;
105 aiov.iov_len = uap->nbyte;
106 auio.uio_iov = &aiov;
107 auio.uio_iovcnt = 1;
108 auio.uio_offset = -1;
109 auio.uio_resid = uap->nbyte;
110 auio.uio_rw = UIO_READ;
111 auio.uio_segflg = UIO_USERSPACE;
112 auio.uio_td = td;
113
e54488bb 114 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
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115 return(error);
116}
117
118/*
7f83ed38 119 * Positioned (Pread) read system call
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120 *
121 * MPSAFE
984263bc 122 */
984263bc 123int
b09fd398 124sys_extpread(struct extpread_args *uap)
984263bc 125{
dadab5e9 126 struct thread *td = curthread;
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127 struct uio auio;
128 struct iovec aiov;
984263bc 129 int error;
9ba76b73 130 int flags;
984263bc 131
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132 if ((ssize_t)uap->nbyte < 0)
133 return(EINVAL);
134
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135 aiov.iov_base = uap->buf;
136 aiov.iov_len = uap->nbyte;
137 auio.uio_iov = &aiov;
138 auio.uio_iovcnt = 1;
139 auio.uio_offset = uap->offset;
140 auio.uio_resid = uap->nbyte;
141 auio.uio_rw = UIO_READ;
142 auio.uio_segflg = UIO_USERSPACE;
143 auio.uio_td = td;
144
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145 flags = uap->flags & O_FMASK;
146 if (uap->offset != (off_t)-1)
147 flags |= O_FOFFSET;
148
e54488bb 149 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
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150 return(error);
151}
152
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153/*
154 * Scatter read system call.
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155 *
156 * MPSAFE
7f83ed38 157 */
984263bc 158int
753fd850 159sys_readv(struct readv_args *uap)
984263bc 160{
dadab5e9 161 struct thread *td = curthread;
984263bc 162 struct uio auio;
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DRJ
163 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
164 int error;
984263bc 165
ba023347 166 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
ef5c76d7 167 &auio.uio_resid);
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168 if (error)
169 return (error);
170 auio.uio_iov = iov;
171 auio.uio_iovcnt = uap->iovcnt;
172 auio.uio_offset = -1;
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173 auio.uio_rw = UIO_READ;
174 auio.uio_segflg = UIO_USERSPACE;
dadab5e9 175 auio.uio_td = td;
984263bc 176
e54488bb 177 error = kern_preadv(uap->fd, &auio, 0, &uap->sysmsg_szresult);
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178
179 iovec_free(&iov, aiov);
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180 return (error);
181}
182
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183
184/*
185 * Scatter positioned read system call.
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186 *
187 * MPSAFE
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188 */
189int
b09fd398 190sys_extpreadv(struct extpreadv_args *uap)
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191{
192 struct thread *td = curthread;
193 struct uio auio;
194 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
195 int error;
9ba76b73 196 int flags;
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197
198 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
ef5c76d7 199 &auio.uio_resid);
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200 if (error)
201 return (error);
202 auio.uio_iov = iov;
203 auio.uio_iovcnt = uap->iovcnt;
204 auio.uio_offset = uap->offset;
205 auio.uio_rw = UIO_READ;
206 auio.uio_segflg = UIO_USERSPACE;
207 auio.uio_td = td;
208
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209 flags = uap->flags & O_FMASK;
210 if (uap->offset != (off_t)-1)
211 flags |= O_FOFFSET;
212
e54488bb 213 error = kern_preadv(uap->fd, &auio, flags, &uap->sysmsg_szresult);
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214
215 iovec_free(&iov, aiov);
216 return(error);
217}
218
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219/*
220 * MPSAFE
221 */
984263bc 222int
e54488bb 223kern_preadv(int fd, struct uio *auio, int flags, size_t *res)
984263bc 224{
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225 struct thread *td = curthread;
226 struct proc *p = td->td_proc;
41c20dac 227 struct file *fp;
7f83ed38 228 int error;
984263bc 229
ba023347
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230 KKASSERT(p);
231
228b401d 232 fp = holdfp(p->p_fd, fd, FREAD);
ba023347 233 if (fp == NULL)
984263bc 234 return (EBADF);
9ba76b73 235 if (flags & O_FOFFSET && fp->f_type != DTYPE_VNODE) {
ba023347 236 error = ESPIPE;
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237 } else {
238 error = dofileread(fd, fp, auio, flags, res);
984263bc 239 }
9f87144f 240 fdrop(fp);
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241 return(error);
242}
243
244/*
245 * Common code for readv and preadv that reads data in
246 * from a file using the passed in uio, offset, and flags.
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247 *
248 * MPALMOSTSAFE - ktrace needs help
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249 */
250static int
e54488bb 251dofileread(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
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252{
253 struct thread *td = curthread;
7f83ed38 254 int error;
e54488bb 255 size_t len;
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256#ifdef KTRACE
257 struct iovec *ktriov = NULL;
258 struct uio ktruio;
259#endif
260
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261#ifdef KTRACE
262 /*
263 * if tracing, save a copy of iovec
264 */
dadab5e9 265 if (KTRPOINT(td, KTR_GENIO)) {
ba023347
DRJ
266 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
267
984263bc 268 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
ba023347
DRJ
269 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
270 ktruio = *auio;
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271 }
272#endif
ba023347 273 len = auio->uio_resid;
87de5057 274 error = fo_read(fp, auio, fp->f_cred, flags);
ba023347
DRJ
275 if (error) {
276 if (auio->uio_resid != len && (error == ERESTART ||
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277 error == EINTR || error == EWOULDBLOCK))
278 error = 0;
279 }
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280#ifdef KTRACE
281 if (ktriov != NULL) {
282 if (error == 0) {
283 ktruio.uio_iov = ktriov;
ba023347 284 ktruio.uio_resid = len - auio->uio_resid;
f832287e 285 get_mplock();
9fb04d14 286 ktrgenio(td->td_lwp, fd, UIO_READ, &ktruio, error);
f832287e 287 rel_mplock();
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288 }
289 FREE(ktriov, M_TEMP);
290 }
291#endif
ba023347
DRJ
292 if (error == 0)
293 *res = len - auio->uio_resid;
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294
295 return(error);
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296}
297
298/*
299 * Write system call
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300 *
301 * MPSAFE
984263bc 302 */
984263bc 303int
753fd850 304sys_write(struct write_args *uap)
984263bc 305{
dadab5e9 306 struct thread *td = curthread;
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307 struct uio auio;
308 struct iovec aiov;
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309 int error;
310
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311 if ((ssize_t)uap->nbyte < 0)
312 error = EINVAL;
313
ba023347
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314 aiov.iov_base = (void *)(uintptr_t)uap->buf;
315 aiov.iov_len = uap->nbyte;
316 auio.uio_iov = &aiov;
317 auio.uio_iovcnt = 1;
318 auio.uio_offset = -1;
319 auio.uio_resid = uap->nbyte;
320 auio.uio_rw = UIO_WRITE;
321 auio.uio_segflg = UIO_USERSPACE;
322 auio.uio_td = td;
323
e54488bb 324 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
dadab5e9 325
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326 return(error);
327}
328
329/*
330 * Pwrite system call
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331 *
332 * MPSAFE
984263bc 333 */
984263bc 334int
b09fd398 335sys_extpwrite(struct extpwrite_args *uap)
984263bc 336{
dadab5e9 337 struct thread *td = curthread;
ba023347
DRJ
338 struct uio auio;
339 struct iovec aiov;
984263bc 340 int error;
9ba76b73 341 int flags;
984263bc 342
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MD
343 if ((ssize_t)uap->nbyte < 0)
344 error = EINVAL;
345
ba023347
DRJ
346 aiov.iov_base = (void *)(uintptr_t)uap->buf;
347 aiov.iov_len = uap->nbyte;
348 auio.uio_iov = &aiov;
349 auio.uio_iovcnt = 1;
350 auio.uio_offset = uap->offset;
351 auio.uio_resid = uap->nbyte;
352 auio.uio_rw = UIO_WRITE;
353 auio.uio_segflg = UIO_USERSPACE;
354 auio.uio_td = td;
355
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MD
356 flags = uap->flags & O_FMASK;
357 if (uap->offset != (off_t)-1)
358 flags |= O_FOFFSET;
e54488bb 359 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
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360 return(error);
361}
362
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363/*
364 * MPSAFE
365 */
ba023347 366int
753fd850 367sys_writev(struct writev_args *uap)
ba023347 368{
dadab5e9 369 struct thread *td = curthread;
984263bc 370 struct uio auio;
ba023347
DRJ
371 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
372 int error;
984263bc 373
ba023347 374 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
ef5c76d7 375 &auio.uio_resid);
ba023347
DRJ
376 if (error)
377 return (error);
378 auio.uio_iov = iov;
379 auio.uio_iovcnt = uap->iovcnt;
380 auio.uio_offset = -1;
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381 auio.uio_rw = UIO_WRITE;
382 auio.uio_segflg = UIO_USERSPACE;
dadab5e9 383 auio.uio_td = td;
ba023347 384
e54488bb 385 error = kern_pwritev(uap->fd, &auio, 0, &uap->sysmsg_szresult);
ba023347
DRJ
386
387 iovec_free(&iov, aiov);
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388 return (error);
389}
390
7f83ed38 391
984263bc 392/*
7f83ed38 393 * Gather positioned write system call
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394 *
395 * MPSAFE
984263bc 396 */
984263bc 397int
b09fd398 398sys_extpwritev(struct extpwritev_args *uap)
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MD
399{
400 struct thread *td = curthread;
401 struct uio auio;
402 struct iovec aiov[UIO_SMALLIOV], *iov = NULL;
403 int error;
9ba76b73 404 int flags;
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405
406 error = iovec_copyin(uap->iovp, &iov, aiov, uap->iovcnt,
ef5c76d7 407 &auio.uio_resid);
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408 if (error)
409 return (error);
410 auio.uio_iov = iov;
411 auio.uio_iovcnt = uap->iovcnt;
412 auio.uio_offset = uap->offset;
413 auio.uio_rw = UIO_WRITE;
414 auio.uio_segflg = UIO_USERSPACE;
415 auio.uio_td = td;
416
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MD
417 flags = uap->flags & O_FMASK;
418 if (uap->offset != (off_t)-1)
419 flags |= O_FOFFSET;
420
e54488bb 421 error = kern_pwritev(uap->fd, &auio, flags, &uap->sysmsg_szresult);
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422
423 iovec_free(&iov, aiov);
424 return(error);
425}
426
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427/*
428 * MPSAFE
429 */
7f83ed38 430int
e54488bb 431kern_pwritev(int fd, struct uio *auio, int flags, size_t *res)
984263bc 432{
dadab5e9
MD
433 struct thread *td = curthread;
434 struct proc *p = td->td_proc;
41c20dac 435 struct file *fp;
7f83ed38 436 int error;
984263bc 437
dadab5e9 438 KKASSERT(p);
dadab5e9 439
228b401d 440 fp = holdfp(p->p_fd, fd, FWRITE);
ba023347 441 if (fp == NULL)
984263bc 442 return (EBADF);
9ba76b73 443 else if ((flags & O_FOFFSET) && fp->f_type != DTYPE_VNODE) {
ba023347 444 error = ESPIPE;
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445 } else {
446 error = dofilewrite(fd, fp, auio, flags, res);
984263bc 447 }
7f83ed38 448
9f87144f 449 fdrop(fp);
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450 return (error);
451}
452
453/*
454 * Common code for writev and pwritev that writes data to
455 * a file using the passed in uio, offset, and flags.
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456 *
457 * MPALMOSTSAFE - ktrace needs help
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458 */
459static int
e54488bb 460dofilewrite(int fd, struct file *fp, struct uio *auio, int flags, size_t *res)
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461{
462 struct thread *td = curthread;
7278a846 463 struct lwp *lp = td->td_lwp;
7f83ed38 464 int error;
e54488bb 465 size_t len;
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466#ifdef KTRACE
467 struct iovec *ktriov = NULL;
468 struct uio ktruio;
469#endif
470
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471#ifdef KTRACE
472 /*
473 * if tracing, save a copy of iovec and uio
474 */
dadab5e9 475 if (KTRPOINT(td, KTR_GENIO)) {
ba023347
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476 int iovlen = auio->uio_iovcnt * sizeof(struct iovec);
477
984263bc 478 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
ba023347
DRJ
479 bcopy((caddr_t)auio->uio_iov, (caddr_t)ktriov, iovlen);
480 ktruio = *auio;
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481 }
482#endif
ba023347 483 len = auio->uio_resid;
87de5057 484 error = fo_write(fp, auio, fp->f_cred, flags);
ba023347
DRJ
485 if (error) {
486 if (auio->uio_resid != len && (error == ERESTART ||
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487 error == EINTR || error == EWOULDBLOCK))
488 error = 0;
7f83ed38 489 /* Socket layer is responsible for issuing SIGPIPE. */
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490 if (error == EPIPE) {
491 get_mplock();
9fb04d14 492 lwpsignal(lp->lwp_proc, lp, SIGPIPE);
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493 rel_mplock();
494 }
984263bc 495 }
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496#ifdef KTRACE
497 if (ktriov != NULL) {
498 if (error == 0) {
499 ktruio.uio_iov = ktriov;
ba023347 500 ktruio.uio_resid = len - auio->uio_resid;
f832287e 501 get_mplock();
9fb04d14 502 ktrgenio(lp, fd, UIO_WRITE, &ktruio, error);
f832287e 503 rel_mplock();
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504 }
505 FREE(ktriov, M_TEMP);
506 }
507#endif
ba023347
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508 if (error == 0)
509 *res = len - auio->uio_resid;
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510
511 return(error);
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512}
513
514/*
515 * Ioctl system call
516 */
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517/* ARGSUSED */
518int
753fd850 519sys_ioctl(struct ioctl_args *uap)
984263bc 520{
a0c5fc96
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521 return(mapped_ioctl(uap->fd, uap->com, uap->data, NULL));
522}
523
524struct ioctl_map_entry {
525 const char *subsys;
526 struct ioctl_map_range *cmd_ranges;
527 LIST_ENTRY(ioctl_map_entry) entries;
528};
529
25b5b94d
SS
530/*
531 * The true heart of all ioctl syscall handlers (native, emulation).
532 * If map != NULL, it will be searched for a matching entry for com,
533 * and appropriate conversions/conversion functions will be utilized.
534 */
a0c5fc96
JS
535int
536mapped_ioctl(int fd, u_long com, caddr_t uspc_data, struct ioctl_map *map)
537{
dadab5e9
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538 struct thread *td = curthread;
539 struct proc *p = td->td_proc;
87de5057 540 struct ucred *cred;
41c20dac 541 struct file *fp;
a0c5fc96 542 struct ioctl_map_range *iomc = NULL;
984263bc 543 int error;
1fd87d54 544 u_int size;
a0c5fc96 545 u_long ocom = com;
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546 caddr_t data, memp;
547 int tmp;
548#define STK_PARAMS 128
549 union {
550 char stkbuf[STK_PARAMS];
551 long align;
552 } ubuf;
553
dadab5e9 554 KKASSERT(p);
87de5057 555 cred = p->p_ucred;
984263bc 556
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557 fp = holdfp(p->p_fd, fd, FREAD|FWRITE);
558 if (fp == NULL)
a0c5fc96
JS
559 return(EBADF);
560
561 if (map != NULL) { /* obey translation map */
562 u_long maskcmd;
563 struct ioctl_map_entry *e;
564
565 maskcmd = com & map->mask;
566
567 LIST_FOREACH(e, &map->mapping, entries) {
568 for (iomc = e->cmd_ranges; iomc->start != 0 ||
25b5b94d
SS
569 iomc->maptocmd != 0 || iomc->wrapfunc != NULL ||
570 iomc->mapfunc != NULL;
a0c5fc96
JS
571 iomc++) {
572 if (maskcmd >= iomc->start &&
573 maskcmd <= iomc->end)
574 break;
575 }
576
577 /* Did we find a match? */
578 if (iomc->start != 0 || iomc->maptocmd != 0 ||
25b5b94d 579 iomc->wrapfunc != NULL || iomc->mapfunc != NULL)
a0c5fc96
JS
580 break;
581 }
582
583 if (iomc == NULL ||
584 (iomc->start == 0 && iomc->maptocmd == 0
25b5b94d 585 && iomc->wrapfunc == NULL && iomc->mapfunc == NULL)) {
6ea70f76 586 kprintf("%s: 'ioctl' fd=%d, cmd=0x%lx ('%c',%d) not implemented\n",
a0c5fc96
JS
587 map->sys, fd, maskcmd,
588 (int)((maskcmd >> 8) & 0xff),
589 (int)(maskcmd & 0xff));
228b401d
MD
590 error = EINVAL;
591 goto done;
a0c5fc96 592 }
984263bc 593
25b5b94d
SS
594 /*
595 * If it's a non-range one to one mapping, maptocmd should be
596 * correct. If it's a ranged one to one mapping, we pass the
597 * original value of com, and for a range mapped to a different
598 * range, we always need a mapping function to translate the
599 * ioctl to our native ioctl. Ex. 6500-65ff <-> 9500-95ff
600 */
601 if (iomc->start == iomc->end && iomc->maptocmd == iomc->maptoend) {
602 com = iomc->maptocmd;
603 } else if (iomc->start == iomc->maptocmd && iomc->end == iomc->maptoend) {
604 if (iomc->mapfunc != NULL)
605 com = iomc->mapfunc(iomc->start, iomc->end,
606 iomc->start, iomc->end,
607 com, com);
608 } else {
609 if (iomc->mapfunc != NULL) {
610 com = iomc->mapfunc(iomc->start, iomc->end,
611 iomc->maptocmd, iomc->maptoend,
612 com, ocom);
613 } else {
6ea70f76 614 kprintf("%s: Invalid mapping for fd=%d, cmd=%#lx ('%c',%d)\n",
25b5b94d
SS
615 map->sys, fd, maskcmd,
616 (int)((maskcmd >> 8) & 0xff),
617 (int)(maskcmd & 0xff));
228b401d
MD
618 error = EINVAL;
619 goto done;
25b5b94d
SS
620 }
621 }
a0c5fc96
JS
622 }
623
624 switch (com) {
984263bc 625 case FIONCLEX:
228b401d
MD
626 error = fclrfdflags(p->p_fd, fd, UF_EXCLOSE);
627 goto done;
984263bc 628 case FIOCLEX:
228b401d
MD
629 error = fsetfdflags(p->p_fd, fd, UF_EXCLOSE);
630 goto done;
984263bc
MD
631 }
632
633 /*
634 * Interpret high order word to find amount of data to be
635 * copied to/from the user's address space.
636 */
637 size = IOCPARM_LEN(com);
228b401d
MD
638 if (size > IOCPARM_MAX) {
639 error = ENOTTY;
640 goto done;
641 }
984263bc
MD
642
643 memp = NULL;
644 if (size > sizeof (ubuf.stkbuf)) {
efda3bd0 645 memp = kmalloc(size, M_IOCTLOPS, M_WAITOK);
984263bc
MD
646 data = memp;
647 } else {
648 data = ubuf.stkbuf;
649 }
a0c5fc96
JS
650 if ((com & IOC_IN) != 0) {
651 if (size != 0) {
e54488bb 652 error = copyin(uspc_data, data, (size_t)size);
984263bc 653 if (error) {
a0c5fc96 654 if (memp != NULL)
efda3bd0 655 kfree(memp, M_IOCTLOPS);
228b401d 656 goto done;
984263bc
MD
657 }
658 } else {
a0c5fc96 659 *(caddr_t *)data = uspc_data;
984263bc 660 }
a0c5fc96 661 } else if ((com & IOC_OUT) != 0 && size) {
984263bc
MD
662 /*
663 * Zero the buffer so the user always
664 * gets back something deterministic.
665 */
e54488bb 666 bzero(data, (size_t)size);
a0c5fc96
JS
667 } else if ((com & IOC_VOID) != 0) {
668 *(caddr_t *)data = uspc_data;
984263bc
MD
669 }
670
671 switch (com) {
984263bc
MD
672 case FIONBIO:
673 if ((tmp = *(int *)data))
674 fp->f_flag |= FNONBLOCK;
675 else
676 fp->f_flag &= ~FNONBLOCK;
9ba76b73 677 error = 0;
984263bc
MD
678 break;
679
680 case FIOASYNC:
681 if ((tmp = *(int *)data))
682 fp->f_flag |= FASYNC;
683 else
684 fp->f_flag &= ~FASYNC;
87de5057 685 error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, cred);
984263bc
MD
686 break;
687
688 default:
a0c5fc96
JS
689 /*
690 * If there is a override function,
691 * call it instead of directly routing the call
692 */
25b5b94d 693 if (map != NULL && iomc->wrapfunc != NULL)
87de5057 694 error = iomc->wrapfunc(fp, com, ocom, data, cred);
a0c5fc96 695 else
87de5057 696 error = fo_ioctl(fp, com, data, cred);
984263bc
MD
697 /*
698 * Copy any data to user, size was
699 * already set and checked above.
700 */
a0c5fc96 701 if (error == 0 && (com & IOC_OUT) != 0 && size != 0)
e54488bb 702 error = copyout(data, uspc_data, (size_t)size);
984263bc
MD
703 break;
704 }
a0c5fc96 705 if (memp != NULL)
efda3bd0 706 kfree(memp, M_IOCTLOPS);
228b401d 707done:
9f87144f 708 fdrop(fp);
a0c5fc96
JS
709 return(error);
710}
711
712int
713mapped_ioctl_register_handler(struct ioctl_map_handler *he)
714{
715 struct ioctl_map_entry *ne;
716
717 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL &&
718 he->subsys != NULL && *he->subsys != '\0');
719
efda3bd0 720 ne = kmalloc(sizeof(struct ioctl_map_entry), M_IOCTLMAP, M_WAITOK);
a0c5fc96
JS
721
722 ne->subsys = he->subsys;
723 ne->cmd_ranges = he->cmd_ranges;
724
725 LIST_INSERT_HEAD(&he->map->mapping, ne, entries);
726
727 return(0);
728}
729
730int
731mapped_ioctl_unregister_handler(struct ioctl_map_handler *he)
732{
733 struct ioctl_map_entry *ne;
734
735 KKASSERT(he != NULL && he->map != NULL && he->cmd_ranges != NULL);
736
737 LIST_FOREACH(ne, &he->map->mapping, entries) {
738 if (ne->cmd_ranges != he->cmd_ranges)
739 continue;
740 LIST_REMOVE(ne, entries);
efda3bd0 741 kfree(ne, M_IOCTLMAP);
a0c5fc96
JS
742 return(0);
743 }
744 return(EINVAL);
984263bc
MD
745}
746
747static int nselcoll; /* Select collisions since boot */
748int selwait;
749SYSCTL_INT(_kern, OID_AUTO, nselcoll, CTLFLAG_RD, &nselcoll, 0, "");
750
751/*
752 * Select system call.
753 */
984263bc 754int
753fd850 755sys_select(struct select_args *uap)
984263bc 756{
ae7cb1b5
NT
757 struct timeval ktv;
758 struct timeval *ktvp;
759 int error;
760
761 /*
762 * Get timeout if any.
763 */
764 if (uap->tv != NULL) {
765 error = copyin(uap->tv, &ktv, sizeof (ktv));
766 if (error)
767 return (error);
768 error = itimerfix(&ktv);
769 if (error)
770 return (error);
771 ktvp = &ktv;
772 } else {
773 ktvp = NULL;
774 }
775
776 /*
777 * Do real work.
778 */
779 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktvp,
780 &uap->sysmsg_result);
781
782 return (error);
783}
784
785
786/*
787 * Pselect system call.
788 */
789int
790sys_pselect(struct pselect_args *uap)
791{
792 struct thread *td = curthread;
793 struct lwp *lp = td->td_lwp;
794 struct timespec kts;
795 struct timeval ktv;
796 struct timeval *ktvp;
797 sigset_t sigmask;
798 int error;
799
800 /*
801 * Get timeout if any and convert it.
802 * Round up during conversion to avoid timeout going off early.
803 */
804 if (uap->ts != NULL) {
805 error = copyin(uap->ts, &kts, sizeof (kts));
806 if (error)
807 return (error);
808 ktv.tv_sec = kts.tv_sec;
809 ktv.tv_usec = (kts.tv_nsec + 999) / 1000;
810 error = itimerfix(&ktv);
811 if (error)
812 return (error);
813 ktvp = &ktv;
814 } else {
815 ktvp = NULL;
816 }
817
818 /*
819 * Install temporary signal mask if any provided.
820 */
821 if (uap->sigmask != NULL) {
822 error = copyin(uap->sigmask, &sigmask, sizeof(sigmask));
823 if (error)
824 return (error);
825 lp->lwp_oldsigmask = lp->lwp_sigmask;
826 SIG_CANTMASK(sigmask);
827 lp->lwp_sigmask = sigmask;
828 }
829
830 /*
831 * Do real job.
832 */
833 error = doselect(uap->nd, uap->in, uap->ou, uap->ex, ktvp,
834 &uap->sysmsg_result);
835
836 if (uap->sigmask != NULL) {
837 /* doselect() responsible for turning ERESTART into EINTR */
838 KKASSERT(error != ERESTART);
839 if (error == EINTR) {
840 /*
841 * We can't restore the previous signal mask now
842 * because it could block the signal that interrupted
843 * us. So make a note to restore it after executing
844 * the handler.
845 */
846 lp->lwp_flag |= LWP_OLDMASK;
847 } else {
848 /*
849 * No handler to run. Restore previous mask immediately.
850 */
851 lp->lwp_sigmask = lp->lwp_oldsigmask;
852 }
853 }
854
855 return (error);
856}
857
858/*
859 * Common code for sys_select() and sys_pselect().
860 *
861 * in, out and ex are userland pointers. tv must point to validated
862 * kernel-side timeout value or NULL for infinite timeout. res must
863 * point to syscall return value.
864 */
865static int
866doselect(int nd, fd_set *in, fd_set *ou, fd_set *ex, struct timeval *tv,
867 int *res)
868{
8067b633 869 struct lwp *lp = curthread->td_lwp;
41c20dac
MD
870 struct proc *p = curproc;
871
984263bc
MD
872 /*
873 * The magic 2048 here is chosen to be just enough for FD_SETSIZE
874 * infds with the new FD_SETSIZE of 1024, and more than enough for
875 * FD_SETSIZE infds, outfds and exceptfds with the old FD_SETSIZE
876 * of 256.
877 */
878 fd_mask s_selbits[howmany(2048, NFDBITS)];
879 fd_mask *ibits[3], *obits[3], *selbits, *sbp;
880 struct timeval atv, rtv, ttv;
e43a034f 881 int ncoll, error, timo;
984263bc
MD
882 u_int nbufbytes, ncpbytes, nfdbits;
883
ae7cb1b5 884 if (nd < 0)
984263bc 885 return (EINVAL);
ae7cb1b5
NT
886 if (nd > p->p_fd->fd_nfiles)
887 nd = p->p_fd->fd_nfiles; /* forgiving; slightly wrong */
984263bc
MD
888
889 /*
890 * Allocate just enough bits for the non-null fd_sets. Use the
891 * preallocated auto buffer if possible.
892 */
ae7cb1b5 893 nfdbits = roundup(nd, NFDBITS);
984263bc
MD
894 ncpbytes = nfdbits / NBBY;
895 nbufbytes = 0;
ae7cb1b5 896 if (in != NULL)
984263bc 897 nbufbytes += 2 * ncpbytes;
ae7cb1b5 898 if (ou != NULL)
984263bc 899 nbufbytes += 2 * ncpbytes;
ae7cb1b5 900 if (ex != NULL)
984263bc
MD
901 nbufbytes += 2 * ncpbytes;
902 if (nbufbytes <= sizeof s_selbits)
903 selbits = &s_selbits[0];
904 else
efda3bd0 905 selbits = kmalloc(nbufbytes, M_SELECT, M_WAITOK);
984263bc
MD
906
907 /*
908 * Assign pointers into the bit buffers and fetch the input bits.
909 * Put the output buffers together so that they can be bzeroed
910 * together.
911 */
912 sbp = selbits;
913#define getbits(name, x) \
914 do { \
ae7cb1b5 915 if (name == NULL) \
984263bc
MD
916 ibits[x] = NULL; \
917 else { \
918 ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \
919 obits[x] = sbp; \
920 sbp += ncpbytes / sizeof *sbp; \
ae7cb1b5 921 error = copyin(name, ibits[x], ncpbytes); \
984263bc
MD
922 if (error != 0) \
923 goto done; \
924 } \
925 } while (0)
926 getbits(in, 0);
927 getbits(ou, 1);
928 getbits(ex, 2);
929#undef getbits
930 if (nbufbytes != 0)
931 bzero(selbits, nbufbytes / 2);
932
ae7cb1b5
NT
933 if (tv != NULL) {
934 atv = *tv;
984263bc
MD
935 getmicrouptime(&rtv);
936 timevaladd(&atv, &rtv);
937 } else {
938 atv.tv_sec = 0;
939 atv.tv_usec = 0;
940 }
941 timo = 0;
942retry:
943 ncoll = nselcoll;
8067b633 944 lp->lwp_flag |= LWP_SELECT;
ae7cb1b5
NT
945 error = selscan(p, ibits, obits, nd, res);
946 if (error || *res)
984263bc
MD
947 goto done;
948 if (atv.tv_sec || atv.tv_usec) {
949 getmicrouptime(&rtv);
ae7cb1b5 950 if (timevalcmp(&rtv, &atv, >=))
984263bc
MD
951 goto done;
952 ttv = atv;
953 timevalsub(&ttv, &rtv);
954 timo = ttv.tv_sec > 24 * 60 * 60 ?
a94976ad 955 24 * 60 * 60 * hz : tvtohz_high(&ttv);
984263bc 956 }
e43a034f 957 crit_enter();
8067b633 958 if ((lp->lwp_flag & LWP_SELECT) == 0 || nselcoll != ncoll) {
e43a034f 959 crit_exit();
984263bc
MD
960 goto retry;
961 }
8067b633 962 lp->lwp_flag &= ~LWP_SELECT;
984263bc 963
377d4740 964 error = tsleep((caddr_t)&selwait, PCATCH, "select", timo);
984263bc 965
e43a034f 966 crit_exit();
984263bc
MD
967 if (error == 0)
968 goto retry;
969done:
8067b633 970 lp->lwp_flag &= ~LWP_SELECT;
984263bc
MD
971 /* select is not restarted after signals... */
972 if (error == ERESTART)
973 error = EINTR;
974 if (error == EWOULDBLOCK)
975 error = 0;
976#define putbits(name, x) \
ae7cb1b5 977 if (name && (error2 = copyout(obits[x], name, ncpbytes))) \
984263bc
MD
978 error = error2;
979 if (error == 0) {
980 int error2;
981
982 putbits(in, 0);
983 putbits(ou, 1);
984 putbits(ex, 2);
985#undef putbits
986 }
987 if (selbits != &s_selbits[0])
efda3bd0 988 kfree(selbits, M_SELECT);
984263bc
MD
989 return (error);
990}
991
992static int
90b9818c 993selscan(struct proc *p, fd_mask **ibits, fd_mask **obits, int nfd, int *res)
984263bc 994{
984263bc
MD
995 int msk, i, fd;
996 fd_mask bits;
997 struct file *fp;
998 int n = 0;
999 /* Note: backend also returns POLLHUP/POLLERR if appropriate. */
1000 static int flag[3] = { POLLRDNORM, POLLWRNORM, POLLRDBAND };
1001
1002 for (msk = 0; msk < 3; msk++) {
1003 if (ibits[msk] == NULL)
1004 continue;
1005 for (i = 0; i < nfd; i += NFDBITS) {
1006 bits = ibits[msk][i/NFDBITS];
1007 /* ffs(int mask) not portable, fd_mask is long */
1008 for (fd = i; bits && fd < nfd; fd++, bits >>= 1) {
1009 if (!(bits & 1))
1010 continue;
228b401d 1011 fp = holdfp(p->p_fd, fd, -1);
984263bc
MD
1012 if (fp == NULL)
1013 return (EBADF);
87de5057 1014 if (fo_poll(fp, flag[msk], fp->f_cred)) {
984263bc
MD
1015 obits[msk][(fd)/NFDBITS] |=
1016 ((fd_mask)1 << ((fd) % NFDBITS));
1017 n++;
1018 }
228b401d 1019 fdrop(fp);
984263bc
MD
1020 }
1021 }
1022 }
90b9818c 1023 *res = n;
984263bc
MD
1024 return (0);
1025}
1026
1027/*
1028 * Poll system call.
1029 */
984263bc 1030int
753fd850 1031sys_poll(struct poll_args *uap)
984263bc 1032{
b525b7ed
DR
1033 struct pollfd *bits;
1034 struct pollfd smallbits[32];
984263bc 1035 struct timeval atv, rtv, ttv;
e43a034f 1036 int ncoll, error = 0, timo;
984263bc
MD
1037 u_int nfds;
1038 size_t ni;
8067b633 1039 struct lwp *lp = curthread->td_lwp;
41c20dac 1040 struct proc *p = curproc;
984263bc 1041
ab2eb4eb 1042 nfds = uap->nfds;
984263bc
MD
1043 /*
1044 * This is kinda bogus. We have fd limits, but that is not
1045 * really related to the size of the pollfd array. Make sure
1046 * we let the process use at least FD_SETSIZE entries and at
1047 * least enough for the current limits. We want to be reasonably
1048 * safe, but not overly restrictive.
1049 */
1050 if (nfds > p->p_rlimit[RLIMIT_NOFILE].rlim_cur && nfds > FD_SETSIZE)
1051 return (EINVAL);
1052 ni = nfds * sizeof(struct pollfd);
1053 if (ni > sizeof(smallbits))
efda3bd0 1054 bits = kmalloc(ni, M_TEMP, M_WAITOK);
984263bc
MD
1055 else
1056 bits = smallbits;
ab2eb4eb 1057 error = copyin(uap->fds, bits, ni);
984263bc
MD
1058 if (error)
1059 goto done;
ab2eb4eb
DR
1060 if (uap->timeout != INFTIM) {
1061 atv.tv_sec = uap->timeout / 1000;
1062 atv.tv_usec = (uap->timeout % 1000) * 1000;
984263bc
MD
1063 if (itimerfix(&atv)) {
1064 error = EINVAL;
1065 goto done;
1066 }
1067 getmicrouptime(&rtv);
1068 timevaladd(&atv, &rtv);
1069 } else {
1070 atv.tv_sec = 0;
1071 atv.tv_usec = 0;
1072 }
1073 timo = 0;
1074retry:
1075 ncoll = nselcoll;
8067b633 1076 lp->lwp_flag |= LWP_SELECT;
b525b7ed 1077 error = pollscan(p, bits, nfds, &uap->sysmsg_result);
c7114eea 1078 if (error || uap->sysmsg_result)
984263bc
MD
1079 goto done;
1080 if (atv.tv_sec || atv.tv_usec) {
1081 getmicrouptime(&rtv);
1082 if (timevalcmp(&rtv, &atv, >=))
1083 goto done;
1084 ttv = atv;
1085 timevalsub(&ttv, &rtv);
1086 timo = ttv.tv_sec > 24 * 60 * 60 ?
a94976ad 1087 24 * 60 * 60 * hz : tvtohz_high(&ttv);
984263bc 1088 }
e43a034f 1089 crit_enter();
8067b633 1090 if ((lp->lwp_flag & LWP_SELECT) == 0 || nselcoll != ncoll) {
e43a034f 1091 crit_exit();
984263bc
MD
1092 goto retry;
1093 }
8067b633 1094 lp->lwp_flag &= ~LWP_SELECT;
377d4740 1095 error = tsleep((caddr_t)&selwait, PCATCH, "poll", timo);
e43a034f 1096 crit_exit();
984263bc
MD
1097 if (error == 0)
1098 goto retry;
1099done:
8067b633 1100 lp->lwp_flag &= ~LWP_SELECT;
984263bc
MD
1101 /* poll is not restarted after signals... */
1102 if (error == ERESTART)
1103 error = EINTR;
1104 if (error == EWOULDBLOCK)
1105 error = 0;
1106 if (error == 0) {
ab2eb4eb 1107 error = copyout(bits, uap->fds, ni);
984263bc
MD
1108 if (error)
1109 goto out;
1110 }
1111out:
1112 if (ni > sizeof(smallbits))
efda3bd0 1113 kfree(bits, M_TEMP);
984263bc
MD
1114 return (error);
1115}
1116
1117static int
90b9818c 1118pollscan(struct proc *p, struct pollfd *fds, u_int nfd, int *res)
984263bc 1119{
984263bc
MD
1120 int i;
1121 struct file *fp;
1122 int n = 0;
1123
1124 for (i = 0; i < nfd; i++, fds++) {
228b401d 1125 if (fds->fd >= p->p_fd->fd_nfiles) {
984263bc
MD
1126 fds->revents = POLLNVAL;
1127 n++;
1128 } else if (fds->fd < 0) {
1129 fds->revents = 0;
1130 } else {
228b401d 1131 fp = holdfp(p->p_fd, fds->fd, -1);
984263bc
MD
1132 if (fp == NULL) {
1133 fds->revents = POLLNVAL;
1134 n++;
1135 } else {
1136 /*
1137 * Note: backend also returns POLLHUP and
1138 * POLLERR if appropriate.
1139 */
1140 fds->revents = fo_poll(fp, fds->events,
87de5057 1141 fp->f_cred);
984263bc
MD
1142 if (fds->revents != 0)
1143 n++;
228b401d 1144 fdrop(fp);
984263bc
MD
1145 }
1146 }
1147 }
90b9818c 1148 *res = n;
984263bc
MD
1149 return (0);
1150}
1151
1152/*
1153 * OpenBSD poll system call.
1154 * XXX this isn't quite a true representation.. OpenBSD uses select ops.
1155 */
984263bc 1156int
753fd850 1157sys_openbsd_poll(struct openbsd_poll_args *uap)
984263bc 1158{
753fd850 1159 return (sys_poll((struct poll_args *)uap));
984263bc
MD
1160}
1161
1162/*ARGSUSED*/
1163int
b13267a5 1164seltrue(cdev_t dev, int events)
984263bc 1165{
984263bc
MD
1166 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
1167}
1168
1169/*
41c20dac
MD
1170 * Record a select request. A global wait must be used since a process/thread
1171 * might go away after recording its request.
984263bc
MD
1172 */
1173void
41c20dac 1174selrecord(struct thread *selector, struct selinfo *sip)
984263bc
MD
1175{
1176 struct proc *p;
8067b633 1177 struct lwp *lp = NULL;
984263bc 1178
8067b633 1179 if (selector->td_lwp == NULL)
41c20dac
MD
1180 panic("selrecord: thread needs a process");
1181
8067b633
SS
1182 if (sip->si_pid == selector->td_proc->p_pid &&
1183 sip->si_tid == selector->td_lwp->lwp_tid)
984263bc 1184 return;
3e291793
MD
1185 if (sip->si_pid && (p = pfind(sip->si_pid)))
1186 lp = lwp_rb_tree_RB_LOOKUP(&p->p_lwp_tree, sip->si_tid);
8067b633 1187 if (lp != NULL && lp->lwp_wchan == (caddr_t)&selwait) {
984263bc 1188 sip->si_flags |= SI_COLL;
41c20dac 1189 } else {
8067b633 1190 sip->si_pid = selector->td_proc->p_pid;
acb157c2 1191 sip->si_tid = selector->td_lwp->lwp_tid;
41c20dac 1192 }
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1193}
1194
1195/*
1196 * Do a wakeup when a selectable event occurs.
1197 */
1198void
41c20dac 1199selwakeup(struct selinfo *sip)
984263bc 1200{
41c20dac 1201 struct proc *p;
8067b633 1202 struct lwp *lp = NULL;
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1203
1204 if (sip->si_pid == 0)
1205 return;
1206 if (sip->si_flags & SI_COLL) {
1207 nselcoll++;
1208 sip->si_flags &= ~SI_COLL;
41c20dac 1209 wakeup((caddr_t)&selwait); /* YYY fixable */
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1210 }
1211 p = pfind(sip->si_pid);
1212 sip->si_pid = 0;
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1213 if (p == NULL)
1214 return;
3e291793 1215 lp = lwp_rb_tree_RB_LOOKUP(&p->p_lwp_tree, sip->si_tid);
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1216 if (lp == NULL)
1217 return;
1218
1219 crit_enter();
1220 if (lp->lwp_wchan == (caddr_t)&selwait) {
1221 /*
1222 * Flag the process to break the tsleep when
1223 * setrunnable is called, but only call setrunnable
1224 * here if the process is not in a stopped state.
1225 */
1226 lp->lwp_flag |= LWP_BREAKTSLEEP;
1227 if (p->p_stat != SSTOP)
1228 setrunnable(lp);
1229 } else if (lp->lwp_flag & LWP_SELECT) {
1230 lp->lwp_flag &= ~LWP_SELECT;
1231 }
1232 crit_exit();
984263bc 1233}
41c20dac 1234