Register keyword removal
[dragonfly.git] / sys / kern / subr_prf.c
CommitLineData
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1/*-
2 * Copyright (c) 1986, 1988, 1991, 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 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/subr_prf.c,v 1.61.2.5 2002/08/31 18:22:08 dwmalone Exp $
1fd87d54 40 * $DragonFly: src/sys/kern/subr_prf.c,v 1.5 2003/07/26 19:42:11 rob Exp $
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41 */
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/msgbuf.h>
47#include <sys/malloc.h>
48#include <sys/proc.h>
49#include <sys/tty.h>
50#include <sys/tprintf.h>
51#include <sys/syslog.h>
52#include <sys/cons.h>
53#include <sys/uio.h>
54#include <sys/sysctl.h>
8a8d5d85 55#include <sys/lock.h>
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56
57/*
58 * Note that stdarg.h and the ANSI style va_start macro is used for both
59 * ANSI and traditional C compilers.
60 */
61#include <machine/stdarg.h>
62
63#define TOCONS 0x01
64#define TOTTY 0x02
65#define TOLOG 0x04
66
67/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
68#define MAXNBUF (sizeof(quad_t) * NBBY + 1)
69
70struct putchar_arg {
71 int flags;
72 int pri;
73 struct tty *tty;
74};
75
76struct snprintf_arg {
77 char *str;
78 size_t remain;
79};
80
81extern int log_open;
82
83struct tty *constty; /* pointer to console "window" tty */
84
85static void (*v_putc)(int) = cnputc; /* routine to putc on virtual console */
86static void msglogchar(int c, int pri);
87static void msgaddchar(int c, void *dummy);
88static void putchar __P((int ch, void *arg));
89static char *ksprintn __P((char *nbuf, u_long num, int base, int *len));
90static char *ksprintqn __P((char *nbuf, u_quad_t num, int base, int *len));
91static void snprintf_func __P((int ch, void *arg));
92
93static int consintr = 1; /* Ok to handle console interrupts? */
94static int msgbufmapped; /* Set when safe to use msgbuf */
95int msgbuftrigger;
96
97static int log_console_output = 1;
98TUNABLE_INT("kern.log_console_output", &log_console_output);
99SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
100 &log_console_output, 0, "");
101
102/*
103 * Warn that a system table is full.
104 */
105void
106tablefull(const char *tab)
107{
108
109 log(LOG_ERR, "%s: table is full\n", tab);
110}
111
112/*
113 * Uprintf prints to the controlling terminal for the current process.
114 * It may block if the tty queue is overfull. No message is printed if
115 * the queue does not clear in a reasonable time.
116 */
117int
118uprintf(const char *fmt, ...)
119{
120 struct proc *p = curproc;
121 va_list ap;
122 struct putchar_arg pca;
123 int retval = 0;
124
125 if (p && p->p_flag & P_CONTROLT &&
126 p->p_session->s_ttyvp) {
127 va_start(ap, fmt);
128 pca.tty = p->p_session->s_ttyp;
129 pca.flags = TOTTY;
8a8d5d85 130
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131 retval = kvprintf(fmt, putchar, &pca, 10, ap);
132 va_end(ap);
133 }
134 return retval;
135}
136
137tpr_t
dadab5e9 138tprintf_open(struct proc *p)
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139{
140
dadab5e9 141 if ((p->p_flag & P_CONTROLT) && p->p_session->s_ttyvp) {
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142 SESSHOLD(p->p_session);
143 return ((tpr_t) p->p_session);
144 }
145 return ((tpr_t) NULL);
146}
147
148void
dadab5e9 149tprintf_close(tpr_t sess)
984263bc 150{
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151 if (sess)
152 SESSRELE((struct session *) sess);
153}
154
155/*
156 * tprintf prints on the controlling terminal associated
157 * with the given session.
158 */
159int
160tprintf(tpr_t tpr, const char *fmt, ...)
161{
1fd87d54 162 struct session *sess = (struct session *)tpr;
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163 struct tty *tp = NULL;
164 int flags = TOLOG;
165 va_list ap;
166 struct putchar_arg pca;
167 int retval;
168
169 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
170 flags |= TOTTY;
171 tp = sess->s_ttyp;
172 }
173 va_start(ap, fmt);
174 pca.tty = tp;
175 pca.flags = flags;
176 pca.pri = LOG_INFO;
177 retval = kvprintf(fmt, putchar, &pca, 10, ap);
178 va_end(ap);
179 msgbuftrigger = 1;
180 return retval;
181}
182
183/*
184 * Ttyprintf displays a message on a tty; it should be used only by
185 * the tty driver, or anything that knows the underlying tty will not
186 * be revoke(2)'d away. Other callers should use tprintf.
187 */
188int
189ttyprintf(struct tty *tp, const char *fmt, ...)
190{
191 va_list ap;
192 struct putchar_arg pca;
193 int retval;
194
195 va_start(ap, fmt);
196 pca.tty = tp;
197 pca.flags = TOTTY;
198 retval = kvprintf(fmt, putchar, &pca, 10, ap);
199 va_end(ap);
200 return retval;
201}
202
203/*
204 * Log writes to the log buffer, and guarantees not to sleep (so can be
205 * called by interrupt routines). If there is no process reading the
206 * log yet, it writes to the console also.
207 */
208int
209log(int level, const char *fmt, ...)
210{
211 va_list ap;
212 int retval;
213 struct putchar_arg pca;
214
215 pca.tty = NULL;
216 pca.pri = level;
217 pca.flags = log_open ? TOLOG : TOCONS;
218
219 va_start(ap, fmt);
220 retval = kvprintf(fmt, putchar, &pca, 10, ap);
221 va_end(ap);
222
223 msgbuftrigger = 1;
224 return (retval);
225}
226
227int
228addlog(const char *fmt, ...)
229{
230 va_list ap;
231 int retval;
232 struct putchar_arg pca;
233
234 pca.tty = NULL;
235 pca.pri = -1;
236 pca.flags = log_open ? TOLOG : TOCONS;
237
238 va_start(ap, fmt);
239 retval = kvprintf(fmt, putchar, &pca, 10, ap);
240 va_end(ap);
241
242 msgbuftrigger = 1;
243 return (retval);
244}
245
246#define CONSCHUNK 128
247
248void
249log_console(struct uio *uio)
250{
251 int c, i, error, iovlen, nl;
252 struct uio muio;
253 struct iovec *miov = NULL;
254 char *consbuffer;
255 int pri;
256
257 if (!log_console_output)
258 return;
259
260 pri = LOG_INFO | LOG_CONSOLE;
261 muio = *uio;
262 iovlen = uio->uio_iovcnt * sizeof (struct iovec);
263 MALLOC(miov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
264 MALLOC(consbuffer, char *, CONSCHUNK, M_TEMP, M_WAITOK);
265 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen);
266 muio.uio_iov = miov;
267 uio = &muio;
268
269 nl = 0;
270 while (uio->uio_resid > 0) {
271 c = imin(uio->uio_resid, CONSCHUNK);
272 error = uiomove(consbuffer, c, uio);
273 if (error != 0)
274 return;
275 for (i = 0; i < c; i++) {
276 msglogchar(consbuffer[i], pri);
277 if (consbuffer[i] == '\n')
278 nl = 1;
279 else
280 nl = 0;
281 }
282 }
283 if (!nl)
284 msglogchar('\n', pri);
285 msgbuftrigger = 1;
286 FREE(miov, M_TEMP);
287 FREE(consbuffer, M_TEMP);
288 return;
289}
290
291int
292printf(const char *fmt, ...)
293{
294 va_list ap;
295 int savintr;
296 struct putchar_arg pca;
297 int retval;
298
299 savintr = consintr; /* disable interrupts */
300 consintr = 0;
301 va_start(ap, fmt);
302 pca.tty = NULL;
303 pca.flags = TOCONS | TOLOG;
304 pca.pri = -1;
8a8d5d85 305 cons_lock();
984263bc 306 retval = kvprintf(fmt, putchar, &pca, 10, ap);
8a8d5d85 307 cons_unlock();
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308 va_end(ap);
309 if (!panicstr)
310 msgbuftrigger = 1;
311 consintr = savintr; /* reenable interrupts */
312 return retval;
313}
314
315int
316vprintf(const char *fmt, va_list ap)
317{
318 int savintr;
319 struct putchar_arg pca;
320 int retval;
321
322 savintr = consintr; /* disable interrupts */
323 consintr = 0;
324 pca.tty = NULL;
325 pca.flags = TOCONS | TOLOG;
326 pca.pri = -1;
8a8d5d85 327 cons_lock();
984263bc 328 retval = kvprintf(fmt, putchar, &pca, 10, ap);
8a8d5d85 329 cons_unlock();
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330 if (!panicstr)
331 msgbuftrigger = 1;
332 consintr = savintr; /* reenable interrupts */
333 return retval;
334}
335
336/*
337 * Print a character on console or users terminal. If destination is
338 * the console then the last bunch of characters are saved in msgbuf for
339 * inspection later.
340 */
341static void
342putchar(int c, void *arg)
343{
344 struct putchar_arg *ap = (struct putchar_arg*) arg;
345 int flags = ap->flags;
346 struct tty *tp = ap->tty;
347 if (panicstr)
348 constty = NULL;
349 if ((flags & TOCONS) && tp == NULL && constty) {
350 tp = constty;
351 flags |= TOTTY;
352 }
353 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
354 (flags & TOCONS) && tp == constty)
355 constty = NULL;
356 if ((flags & TOLOG))
357 msglogchar(c, ap->pri);
358 if ((flags & TOCONS) && constty == NULL && c != '\0')
359 (*v_putc)(c);
360}
361
362/*
363 * Scaled down version of sprintf(3).
364 */
365int
366sprintf(char *buf, const char *cfmt, ...)
367{
368 int retval;
369 va_list ap;
370
371 va_start(ap, cfmt);
372 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
373 buf[retval] = '\0';
374 va_end(ap);
375 return retval;
376}
377
378/*
379 * Scaled down version of vsprintf(3).
380 */
381int
382vsprintf(char *buf, const char *cfmt, va_list ap)
383{
384 int retval;
385
386 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
387 buf[retval] = '\0';
388 return retval;
389}
390
391/*
392 * Scaled down version of snprintf(3).
393 */
394int
395snprintf(char *str, size_t size, const char *format, ...)
396{
397 int retval;
398 va_list ap;
399
400 va_start(ap, format);
401 retval = vsnprintf(str, size, format, ap);
402 va_end(ap);
403 return(retval);
404}
405
406/*
407 * Scaled down version of vsnprintf(3).
408 */
409int
410vsnprintf(char *str, size_t size, const char *format, va_list ap)
411{
412 struct snprintf_arg info;
413 int retval;
414
415 info.str = str;
416 info.remain = size;
417 retval = kvprintf(format, snprintf_func, &info, 10, ap);
418 if (info.remain >= 1)
419 *info.str++ = '\0';
420 return retval;
421}
422
423static void
424snprintf_func(int ch, void *arg)
425{
426 struct snprintf_arg *const info = arg;
427
428 if (info->remain >= 2) {
429 *info->str++ = ch;
430 info->remain--;
431 }
432}
433
434/*
435 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
436 * order; return an optional length and a pointer to the last character
437 * written in the buffer (i.e., the first character of the string).
438 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
439 */
440static char *
441ksprintn(nbuf, ul, base, lenp)
442 char *nbuf;
443 u_long ul;
444 int base, *lenp;
445{
446 char *p;
447
448 p = nbuf;
449 *p = '\0';
450 do {
451 *++p = hex2ascii(ul % base);
452 } while (ul /= base);
453 if (lenp)
454 *lenp = p - nbuf;
455 return (p);
456}
457/* ksprintn, but for a quad_t. */
458static char *
459ksprintqn(nbuf, uq, base, lenp)
460 char *nbuf;
461 u_quad_t uq;
462 int base, *lenp;
463{
464 char *p;
465
466 p = nbuf;
467 *p = '\0';
468 do {
469 *++p = hex2ascii(uq % base);
470 } while (uq /= base);
471 if (lenp)
472 *lenp = p - nbuf;
473 return (p);
474}
475
476/*
477 * Scaled down version of printf(3).
478 *
479 * Two additional formats:
480 *
481 * The format %b is supported to decode error registers.
482 * Its usage is:
483 *
484 * printf("reg=%b\n", regval, "<base><arg>*");
485 *
486 * where <base> is the output base expressed as a control character, e.g.
487 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
488 * the first of which gives the bit number to be inspected (origin 1), and
489 * the next characters (up to a control character, i.e. a character <= 32),
490 * give the name of the register. Thus:
491 *
492 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
493 *
494 * would produce output:
495 *
496 * reg=3<BITTWO,BITONE>
497 *
498 * XXX: %D -- Hexdump, takes pointer and separator string:
499 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
500 * ("%*D", len, ptr, " " -> XX XX XX XX ...
501 */
502int
503kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
504{
505#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
506 char nbuf[MAXNBUF];
507 char *p, *q, *d;
508 u_char *up;
509 int ch, n;
510 u_long ul;
511 u_quad_t uq;
512 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
513 int dwidth;
514 char padc;
515 int retval = 0;
516
517 ul = 0;
518 uq = 0;
519 if (!func)
520 d = (char *) arg;
521 else
522 d = NULL;
523
524 if (fmt == NULL)
525 fmt = "(fmt null)\n";
526
527 if (radix < 2 || radix > 36)
528 radix = 10;
529
530 for (;;) {
531 padc = ' ';
532 width = 0;
533 while ((ch = (u_char)*fmt++) != '%') {
534 if (ch == '\0')
535 return retval;
536 PCHAR(ch);
537 }
538 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
539 sign = 0; dot = 0; dwidth = 0;
540reswitch: switch (ch = (u_char)*fmt++) {
541 case '.':
542 dot = 1;
543 goto reswitch;
544 case '#':
545 sharpflag = 1;
546 goto reswitch;
547 case '+':
548 sign = 1;
549 goto reswitch;
550 case '-':
551 ladjust = 1;
552 goto reswitch;
553 case '%':
554 PCHAR(ch);
555 break;
556 case '*':
557 if (!dot) {
558 width = va_arg(ap, int);
559 if (width < 0) {
560 ladjust = !ladjust;
561 width = -width;
562 }
563 } else {
564 dwidth = va_arg(ap, int);
565 }
566 goto reswitch;
567 case '0':
568 if (!dot) {
569 padc = '0';
570 goto reswitch;
571 }
572 case '1': case '2': case '3': case '4':
573 case '5': case '6': case '7': case '8': case '9':
574 for (n = 0;; ++fmt) {
575 n = n * 10 + ch - '0';
576 ch = *fmt;
577 if (ch < '0' || ch > '9')
578 break;
579 }
580 if (dot)
581 dwidth = n;
582 else
583 width = n;
584 goto reswitch;
585 case 'b':
586 ul = va_arg(ap, int);
587 p = va_arg(ap, char *);
588 for (q = ksprintn(nbuf, ul, *p++, NULL); *q;)
589 PCHAR(*q--);
590
591 if (!ul)
592 break;
593
594 for (tmp = 0; *p;) {
595 n = *p++;
596 if (ul & (1 << (n - 1))) {
597 PCHAR(tmp ? ',' : '<');
598 for (; (n = *p) > ' '; ++p)
599 PCHAR(n);
600 tmp = 1;
601 } else
602 for (; *p > ' '; ++p)
603 continue;
604 }
605 if (tmp)
606 PCHAR('>');
607 break;
608 case 'c':
609 PCHAR(va_arg(ap, int));
610 break;
611 case 'D':
612 up = va_arg(ap, u_char *);
613 p = va_arg(ap, char *);
614 if (!width)
615 width = 16;
616 while(width--) {
617 PCHAR(hex2ascii(*up >> 4));
618 PCHAR(hex2ascii(*up & 0x0f));
619 up++;
620 if (width)
621 for (q=p;*q;q++)
622 PCHAR(*q);
623 }
624 break;
625 case 'd':
626 if (qflag)
627 uq = va_arg(ap, quad_t);
628 else if (lflag)
629 ul = va_arg(ap, long);
630 else
631 ul = va_arg(ap, int);
632 sign = 1;
633 base = 10;
634 goto number;
635 case 'l':
636 if (lflag) {
637 lflag = 0;
638 qflag = 1;
639 } else
640 lflag = 1;
641 goto reswitch;
642 case 'o':
643 if (qflag)
644 uq = va_arg(ap, u_quad_t);
645 else if (lflag)
646 ul = va_arg(ap, u_long);
647 else
648 ul = va_arg(ap, u_int);
649 base = 8;
650 goto nosign;
651 case 'p':
652 ul = (uintptr_t)va_arg(ap, void *);
653 base = 16;
654 sharpflag = (width == 0);
655 goto nosign;
656 case 'q':
657 qflag = 1;
658 goto reswitch;
659 case 'n':
660 case 'r':
661 if (qflag)
662 uq = va_arg(ap, u_quad_t);
663 else if (lflag)
664 ul = va_arg(ap, u_long);
665 else
666 ul = sign ?
667 (u_long)va_arg(ap, int) : va_arg(ap, u_int);
668 base = radix;
669 goto number;
670 case 's':
671 p = va_arg(ap, char *);
672 if (p == NULL)
673 p = "(null)";
674 if (!dot)
675 n = strlen (p);
676 else
677 for (n = 0; n < dwidth && p[n]; n++)
678 continue;
679
680 width -= n;
681
682 if (!ladjust && width > 0)
683 while (width--)
684 PCHAR(padc);
685 while (n--)
686 PCHAR(*p++);
687 if (ladjust && width > 0)
688 while (width--)
689 PCHAR(padc);
690 break;
691 case 'u':
692 if (qflag)
693 uq = va_arg(ap, u_quad_t);
694 else if (lflag)
695 ul = va_arg(ap, u_long);
696 else
697 ul = va_arg(ap, u_int);
698 base = 10;
699 goto nosign;
700 case 'x':
701 case 'X':
702 if (qflag)
703 uq = va_arg(ap, u_quad_t);
704 else if (lflag)
705 ul = va_arg(ap, u_long);
706 else
707 ul = va_arg(ap, u_int);
708 base = 16;
709 goto nosign;
710 case 'z':
711 if (qflag)
712 uq = va_arg(ap, u_quad_t);
713 else if (lflag)
714 ul = va_arg(ap, u_long);
715 else
716 ul = sign ?
717 (u_long)va_arg(ap, int) : va_arg(ap, u_int);
718 base = 16;
719 goto number;
720nosign: sign = 0;
721number:
722 if (qflag) {
723 if (sign && (quad_t)uq < 0) {
724 neg = 1;
725 uq = -(quad_t)uq;
726 }
727 p = ksprintqn(nbuf, uq, base, &tmp);
728 } else {
729 if (sign && (long)ul < 0) {
730 neg = 1;
731 ul = -(long)ul;
732 }
733 p = ksprintn(nbuf, ul, base, &tmp);
734 }
735 if (sharpflag && (qflag ? uq != 0 : ul != 0)) {
736 if (base == 8)
737 tmp++;
738 else if (base == 16)
739 tmp += 2;
740 }
741 if (neg)
742 tmp++;
743
744 if (!ladjust && width && (width -= tmp) > 0)
745 while (width--)
746 PCHAR(padc);
747 if (neg)
748 PCHAR('-');
749 if (sharpflag && (qflag ? uq != 0 : ul != 0)) {
750 if (base == 8) {
751 PCHAR('0');
752 } else if (base == 16) {
753 PCHAR('0');
754 PCHAR('x');
755 }
756 }
757
758 while (*p)
759 PCHAR(*p--);
760
761 if (ladjust && width && (width -= tmp) > 0)
762 while (width--)
763 PCHAR(padc);
764
765 break;
766 default:
767 PCHAR('%');
768 if (lflag)
769 PCHAR('l');
770 PCHAR(ch);
771 break;
772 }
773 }
774#undef PCHAR
775}
776
777/*
778 * Put character in log buffer with a particular priority.
779 */
780static void
781msglogchar(int c, int pri)
782{
783 static int lastpri = -1;
784 static int dangling;
785 char nbuf[MAXNBUF];
786 char *p;
787
788 if (!msgbufmapped)
789 return;
790 if (c == '\0' || c == '\r')
791 return;
792 if (pri != -1 && pri != lastpri) {
793 if (dangling) {
794 msgaddchar('\n', NULL);
795 dangling = 0;
796 }
797 msgaddchar('<', NULL);
798 for (p = ksprintn(nbuf, (u_long)pri, 10, NULL); *p;)
799 msgaddchar(*p--, NULL);
800 msgaddchar('>', NULL);
801 lastpri = pri;
802 }
803 msgaddchar(c, NULL);
804 if (c == '\n') {
805 dangling = 0;
806 lastpri = -1;
807 } else {
808 dangling = 1;
809 }
810}
811
812/*
813 * Put char in log buffer
814 */
815static void
816msgaddchar(int c, void *dummy)
817{
818 struct msgbuf *mbp;
819
820 if (!msgbufmapped)
821 return;
822 mbp = msgbufp;
823 mbp->msg_ptr[mbp->msg_bufx++] = c;
824 if (mbp->msg_bufx >= mbp->msg_size)
825 mbp->msg_bufx = 0;
826 /* If the buffer is full, keep the most recent data. */
827 if (mbp->msg_bufr == mbp->msg_bufx) {
828 if (++mbp->msg_bufr >= mbp->msg_size)
829 mbp->msg_bufr = 0;
830 }
831}
832
833static void
834msgbufcopy(struct msgbuf *oldp)
835{
836 int pos;
837
838 pos = oldp->msg_bufr;
839 while (pos != oldp->msg_bufx) {
840 msglogchar(oldp->msg_ptr[pos], -1);
841 if (++pos >= oldp->msg_size)
842 pos = 0;
843 }
844}
845
846void
847msgbufinit(void *ptr, size_t size)
848{
849 char *cp;
850 static struct msgbuf *oldp = NULL;
851
852 size -= sizeof(*msgbufp);
853 cp = (char *)ptr;
854 msgbufp = (struct msgbuf *) (cp + size);
855 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size ||
856 msgbufp->msg_bufx >= size || msgbufp->msg_bufr >= size) {
857 bzero(cp, size);
858 bzero(msgbufp, sizeof(*msgbufp));
859 msgbufp->msg_magic = MSG_MAGIC;
860 msgbufp->msg_size = (char *)msgbufp - cp;
861 }
862 msgbufp->msg_ptr = cp;
863 if (msgbufmapped && oldp != msgbufp)
864 msgbufcopy(oldp);
865 msgbufmapped = 1;
866 oldp = msgbufp;
867}
868
869/* Sysctls for accessing/clearing the msgbuf */
870static int
871sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
872{
873 int error;
874
875 /*
876 * Unwind the buffer, so that it's linear (possibly starting with
877 * some initial nulls).
878 */
879 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr + msgbufp->msg_bufx,
880 msgbufp->msg_size - msgbufp->msg_bufx, req);
881 if (error)
882 return (error);
883 if (msgbufp->msg_bufx > 0) {
884 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr,
885 msgbufp->msg_bufx, req);
886 }
887 return (error);
888}
889
890SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
891 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
892
893static int msgbuf_clear;
894
895static int
896sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
897{
898 int error;
899 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
900 if (!error && req->newptr) {
901 /* Clear the buffer and reset write pointer */
902 bzero(msgbufp->msg_ptr, msgbufp->msg_size);
903 msgbufp->msg_bufr = msgbufp->msg_bufx = 0;
904 msgbuf_clear = 0;
905 }
906 return (error);
907}
908
909SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
910 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0,
911 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
912
913#include "opt_ddb.h"
914#ifdef DDB
915#include <ddb/ddb.h>
916
917DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
918{
919 int i, j;
920
921 if (!msgbufmapped) {
922 db_printf("msgbuf not mapped yet\n");
923 return;
924 }
925 db_printf("msgbufp = %p\n", msgbufp);
926 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n",
927 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr,
928 msgbufp->msg_bufx, msgbufp->msg_ptr);
929 for (i = 0; i < msgbufp->msg_size; i++) {
930 j = (i + msgbufp->msg_bufr) % msgbufp->msg_size;
931 db_printf("%c", msgbufp->msg_ptr[j]);
932 }
933 db_printf("\n");
934}
935
936#endif /* DDB */