FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c
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 * 4. 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 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/6.1/sys/kern/subr_prf.c 158179 2006-04-30 16:44:43Z cvs2svn $");
39
40 #include "opt_ddb.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/lock.h>
45 #include <sys/kdb.h>
46 #include <sys/mutex.h>
47 #include <sys/sx.h>
48 #include <sys/kernel.h>
49 #include <sys/msgbuf.h>
50 #include <sys/malloc.h>
51 #include <sys/proc.h>
52 #include <sys/stddef.h>
53 #include <sys/sysctl.h>
54 #include <sys/tty.h>
55 #include <sys/syslog.h>
56 #include <sys/cons.h>
57 #include <sys/uio.h>
58
59 #ifdef DDB
60 #include <ddb/ddb.h>
61 #endif
62
63 /*
64 * Note that stdarg.h and the ANSI style va_start macro is used for both
65 * ANSI and traditional C compilers.
66 */
67 #include <machine/stdarg.h>
68
69 #define TOCONS 0x01
70 #define TOTTY 0x02
71 #define TOLOG 0x04
72
73 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
74 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
75
76 struct putchar_arg {
77 int flags;
78 int pri;
79 struct tty *tty;
80 };
81
82 struct snprintf_arg {
83 char *str;
84 size_t remain;
85 };
86
87 extern int log_open;
88
89 static void msglogchar(int c, int pri);
90 static void putchar(int ch, void *arg);
91 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len);
92 static void snprintf_func(int ch, void *arg);
93
94 static int consintr = 1; /* Ok to handle console interrupts? */
95 static int msgbufmapped; /* Set when safe to use msgbuf */
96 int msgbuftrigger;
97
98 static int log_console_output = 1;
99 TUNABLE_INT("kern.log_console_output", &log_console_output);
100 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
101 &log_console_output, 0, "Duplicate console output to the syslog.");
102
103 static int always_console_output = 0;
104 TUNABLE_INT("kern.always_console_output", &always_console_output);
105 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
106 &always_console_output, 0, "Always output to console despite TIOCCONS.");
107
108 /*
109 * Warn that a system table is full.
110 */
111 void
112 tablefull(const char *tab)
113 {
114
115 log(LOG_ERR, "%s: table is full\n", tab);
116 }
117
118 /*
119 * Uprintf prints to the controlling terminal for the current process.
120 */
121 int
122 uprintf(const char *fmt, ...)
123 {
124 struct thread *td = curthread;
125 struct proc *p = td->td_proc;
126 va_list ap;
127 struct putchar_arg pca;
128 int retval;
129
130 if (td == NULL || td == PCPU_GET(idlethread))
131 return (0);
132
133 mtx_lock(&Giant);
134 p = td->td_proc;
135 PROC_LOCK(p);
136 if ((p->p_flag & P_CONTROLT) == 0) {
137 PROC_UNLOCK(p);
138 retval = 0;
139 goto out;
140 }
141 SESS_LOCK(p->p_session);
142 pca.tty = p->p_session->s_ttyp;
143 SESS_UNLOCK(p->p_session);
144 PROC_UNLOCK(p);
145 if (pca.tty == NULL) {
146 retval = 0;
147 goto out;
148 }
149 pca.flags = TOTTY;
150 va_start(ap, fmt);
151 retval = kvprintf(fmt, putchar, &pca, 10, ap);
152 va_end(ap);
153 out:
154 mtx_unlock(&Giant);
155 return (retval);
156 }
157
158 /*
159 * tprintf prints on the controlling terminal associated with the given
160 * session, possibly to the log as well.
161 */
162 void
163 tprintf(struct proc *p, int pri, const char *fmt, ...)
164 {
165 struct tty *tp = NULL;
166 int flags = 0;
167 va_list ap;
168 struct putchar_arg pca;
169 struct session *sess = NULL;
170
171 mtx_lock(&Giant);
172 if (pri != -1)
173 flags |= TOLOG;
174 if (p != NULL) {
175 PROC_LOCK(p);
176 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
177 sess = p->p_session;
178 SESS_LOCK(sess);
179 PROC_UNLOCK(p);
180 SESSHOLD(sess);
181 tp = sess->s_ttyp;
182 SESS_UNLOCK(sess);
183 if (ttycheckoutq(tp, 0))
184 flags |= TOTTY;
185 else
186 tp = NULL;
187 } else
188 PROC_UNLOCK(p);
189 }
190 pca.pri = pri;
191 pca.tty = tp;
192 pca.flags = flags;
193 va_start(ap, fmt);
194 kvprintf(fmt, putchar, &pca, 10, ap);
195 va_end(ap);
196 if (sess != NULL)
197 SESSRELE(sess);
198 msgbuftrigger = 1;
199 mtx_unlock(&Giant);
200 }
201
202 /*
203 * Ttyprintf displays a message on a tty; it should be used only by
204 * the tty driver, or anything that knows the underlying tty will not
205 * be revoke(2)'d away. Other callers should use tprintf.
206 */
207 int
208 ttyprintf(struct tty *tp, const char *fmt, ...)
209 {
210 va_list ap;
211 struct putchar_arg pca;
212 int retval;
213
214 va_start(ap, fmt);
215 pca.tty = tp;
216 pca.flags = TOTTY;
217 retval = kvprintf(fmt, putchar, &pca, 10, ap);
218 va_end(ap);
219 return (retval);
220 }
221
222 /*
223 * Log writes to the log buffer, and guarantees not to sleep (so can be
224 * called by interrupt routines). If there is no process reading the
225 * log yet, it writes to the console also.
226 */
227 void
228 log(int level, const char *fmt, ...)
229 {
230 va_list ap;
231 struct putchar_arg pca;
232
233 pca.tty = NULL;
234 pca.pri = level;
235 pca.flags = log_open ? TOLOG : TOCONS;
236
237 va_start(ap, fmt);
238 kvprintf(fmt, putchar, &pca, 10, ap);
239 va_end(ap);
240
241 msgbuftrigger = 1;
242 }
243
244 #define CONSCHUNK 128
245
246 void
247 log_console(struct uio *uio)
248 {
249 int c, i, error, nl;
250 char *consbuffer;
251 int pri;
252
253 if (!log_console_output)
254 return;
255
256 pri = LOG_INFO | LOG_CONSOLE;
257 uio = cloneuio(uio);
258 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
259
260 nl = 0;
261 while (uio->uio_resid > 0) {
262 c = imin(uio->uio_resid, CONSCHUNK);
263 error = uiomove(consbuffer, c, uio);
264 if (error != 0)
265 break;
266 for (i = 0; i < c; i++) {
267 msglogchar(consbuffer[i], pri);
268 if (consbuffer[i] == '\n')
269 nl = 1;
270 else
271 nl = 0;
272 }
273 }
274 if (!nl)
275 msglogchar('\n', pri);
276 msgbuftrigger = 1;
277 free(uio, M_IOV);
278 free(consbuffer, M_TEMP);
279 return;
280 }
281
282 int
283 printf(const char *fmt, ...)
284 {
285 va_list ap;
286 int savintr;
287 struct putchar_arg pca;
288 int retval;
289
290 savintr = consintr; /* disable interrupts */
291 consintr = 0;
292 va_start(ap, fmt);
293 pca.tty = NULL;
294 pca.flags = TOCONS | TOLOG;
295 pca.pri = -1;
296 retval = kvprintf(fmt, putchar, &pca, 10, ap);
297 va_end(ap);
298 if (!panicstr)
299 msgbuftrigger = 1;
300 consintr = savintr; /* reenable interrupts */
301 return (retval);
302 }
303
304 int
305 vprintf(const char *fmt, va_list ap)
306 {
307 int savintr;
308 struct putchar_arg pca;
309 int retval;
310
311 savintr = consintr; /* disable interrupts */
312 consintr = 0;
313 pca.tty = NULL;
314 pca.flags = TOCONS | TOLOG;
315 pca.pri = -1;
316 retval = kvprintf(fmt, putchar, &pca, 10, ap);
317 if (!panicstr)
318 msgbuftrigger = 1;
319 consintr = savintr; /* reenable interrupts */
320 return (retval);
321 }
322
323 /*
324 * Print a character on console or users terminal. If destination is
325 * the console then the last bunch of characters are saved in msgbuf for
326 * inspection later.
327 */
328 static void
329 putchar(int c, void *arg)
330 {
331 struct putchar_arg *ap = (struct putchar_arg*) arg;
332 struct tty *tp = ap->tty;
333 int consdirect, flags = ap->flags;
334
335 consdirect = ((flags & TOCONS) && constty == NULL);
336 /* Don't use the tty code after a panic or while in ddb. */
337 if (panicstr)
338 consdirect = 1;
339 if (kdb_active)
340 consdirect = 1;
341 if (consdirect) {
342 if (c != '\0')
343 cnputc(c);
344 } else {
345 if ((flags & TOTTY) && tp != NULL)
346 tputchar(c, tp);
347 if (flags & TOCONS) {
348 if (constty != NULL)
349 msgbuf_addchar(&consmsgbuf, c);
350 if (always_console_output && c != '\0')
351 cnputc(c);
352 }
353 }
354 if ((flags & TOLOG))
355 msglogchar(c, ap->pri);
356 }
357
358 /*
359 * Scaled down version of sprintf(3).
360 */
361 int
362 sprintf(char *buf, const char *cfmt, ...)
363 {
364 int retval;
365 va_list ap;
366
367 va_start(ap, cfmt);
368 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
369 buf[retval] = '\0';
370 va_end(ap);
371 return (retval);
372 }
373
374 /*
375 * Scaled down version of vsprintf(3).
376 */
377 int
378 vsprintf(char *buf, const char *cfmt, va_list ap)
379 {
380 int retval;
381
382 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
383 buf[retval] = '\0';
384 return (retval);
385 }
386
387 /*
388 * Scaled down version of snprintf(3).
389 */
390 int
391 snprintf(char *str, size_t size, const char *format, ...)
392 {
393 int retval;
394 va_list ap;
395
396 va_start(ap, format);
397 retval = vsnprintf(str, size, format, ap);
398 va_end(ap);
399 return(retval);
400 }
401
402 /*
403 * Scaled down version of vsnprintf(3).
404 */
405 int
406 vsnprintf(char *str, size_t size, const char *format, va_list ap)
407 {
408 struct snprintf_arg info;
409 int retval;
410
411 info.str = str;
412 info.remain = size;
413 retval = kvprintf(format, snprintf_func, &info, 10, ap);
414 if (info.remain >= 1)
415 *info.str++ = '\0';
416 return (retval);
417 }
418
419 /*
420 * Kernel version which takes radix argument vsnprintf(3).
421 */
422 int
423 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
424 {
425 struct snprintf_arg info;
426 int retval;
427
428 info.str = str;
429 info.remain = size;
430 retval = kvprintf(format, snprintf_func, &info, radix, ap);
431 if (info.remain >= 1)
432 *info.str++ = '\0';
433 return (retval);
434 }
435
436 static void
437 snprintf_func(int ch, void *arg)
438 {
439 struct snprintf_arg *const info = arg;
440
441 if (info->remain >= 2) {
442 *info->str++ = ch;
443 info->remain--;
444 }
445 }
446
447 /*
448 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
449 * order; return an optional length and a pointer to the last character
450 * written in the buffer (i.e., the first character of the string).
451 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
452 */
453 static char *
454 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp)
455 {
456 char *p;
457
458 p = nbuf;
459 *p = '\0';
460 do {
461 *++p = hex2ascii(num % base);
462 } while (num /= base);
463 if (lenp)
464 *lenp = p - nbuf;
465 return (p);
466 }
467
468 /*
469 * Scaled down version of printf(3).
470 *
471 * Two additional formats:
472 *
473 * The format %b is supported to decode error registers.
474 * Its usage is:
475 *
476 * printf("reg=%b\n", regval, "<base><arg>*");
477 *
478 * where <base> is the output base expressed as a control character, e.g.
479 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
480 * the first of which gives the bit number to be inspected (origin 1), and
481 * the next characters (up to a control character, i.e. a character <= 32),
482 * give the name of the register. Thus:
483 *
484 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
485 *
486 * would produce output:
487 *
488 * reg=3<BITTWO,BITONE>
489 *
490 * XXX: %D -- Hexdump, takes pointer and separator string:
491 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
492 * ("%*D", len, ptr, " " -> XX XX XX XX ...
493 */
494 int
495 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
496 {
497 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
498 char nbuf[MAXNBUF];
499 char *d;
500 const char *p, *percent, *q;
501 u_char *up;
502 int ch, n;
503 uintmax_t num;
504 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
505 int cflag, hflag, jflag, tflag, zflag;
506 int dwidth;
507 char padc;
508 int stop = 0, retval = 0;
509
510 num = 0;
511 if (!func)
512 d = (char *) arg;
513 else
514 d = NULL;
515
516 if (fmt == NULL)
517 fmt = "(fmt null)\n";
518
519 if (radix < 2 || radix > 36)
520 radix = 10;
521
522 for (;;) {
523 padc = ' ';
524 width = 0;
525 while ((ch = (u_char)*fmt++) != '%' || stop) {
526 if (ch == '\0')
527 return (retval);
528 PCHAR(ch);
529 }
530 percent = fmt - 1;
531 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
532 sign = 0; dot = 0; dwidth = 0;
533 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
534 reswitch: switch (ch = (u_char)*fmt++) {
535 case '.':
536 dot = 1;
537 goto reswitch;
538 case '#':
539 sharpflag = 1;
540 goto reswitch;
541 case '+':
542 sign = 1;
543 goto reswitch;
544 case '-':
545 ladjust = 1;
546 goto reswitch;
547 case '%':
548 PCHAR(ch);
549 break;
550 case '*':
551 if (!dot) {
552 width = va_arg(ap, int);
553 if (width < 0) {
554 ladjust = !ladjust;
555 width = -width;
556 }
557 } else {
558 dwidth = va_arg(ap, int);
559 }
560 goto reswitch;
561 case '':
562 if (!dot) {
563 padc = '';
564 goto reswitch;
565 }
566 case '1': case '2': case '3': case '4':
567 case '5': case '6': case '7': case '8': case '9':
568 for (n = 0;; ++fmt) {
569 n = n * 10 + ch - '';
570 ch = *fmt;
571 if (ch < '' || ch > '9')
572 break;
573 }
574 if (dot)
575 dwidth = n;
576 else
577 width = n;
578 goto reswitch;
579 case 'b':
580 num = (u_int)va_arg(ap, int);
581 p = va_arg(ap, char *);
582 for (q = ksprintn(nbuf, num, *p++, NULL); *q;)
583 PCHAR(*q--);
584
585 if (num == 0)
586 break;
587
588 for (tmp = 0; *p;) {
589 n = *p++;
590 if (num & (1 << (n - 1))) {
591 PCHAR(tmp ? ',' : '<');
592 for (; (n = *p) > ' '; ++p)
593 PCHAR(n);
594 tmp = 1;
595 } else
596 for (; *p > ' '; ++p)
597 continue;
598 }
599 if (tmp)
600 PCHAR('>');
601 break;
602 case 'c':
603 PCHAR(va_arg(ap, int));
604 break;
605 case 'D':
606 up = va_arg(ap, u_char *);
607 p = va_arg(ap, char *);
608 if (!width)
609 width = 16;
610 while(width--) {
611 PCHAR(hex2ascii(*up >> 4));
612 PCHAR(hex2ascii(*up & 0x0f));
613 up++;
614 if (width)
615 for (q=p;*q;q++)
616 PCHAR(*q);
617 }
618 break;
619 case 'd':
620 case 'i':
621 base = 10;
622 sign = 1;
623 goto handle_sign;
624 case 'h':
625 if (hflag) {
626 hflag = 0;
627 cflag = 1;
628 } else
629 hflag = 1;
630 goto reswitch;
631 case 'j':
632 jflag = 1;
633 goto reswitch;
634 case 'l':
635 if (lflag) {
636 lflag = 0;
637 qflag = 1;
638 } else
639 lflag = 1;
640 goto reswitch;
641 case 'n':
642 if (jflag)
643 *(va_arg(ap, intmax_t *)) = retval;
644 else if (qflag)
645 *(va_arg(ap, quad_t *)) = retval;
646 else if (lflag)
647 *(va_arg(ap, long *)) = retval;
648 else if (zflag)
649 *(va_arg(ap, size_t *)) = retval;
650 else if (hflag)
651 *(va_arg(ap, short *)) = retval;
652 else if (cflag)
653 *(va_arg(ap, char *)) = retval;
654 else
655 *(va_arg(ap, int *)) = retval;
656 break;
657 case 'o':
658 base = 8;
659 goto handle_nosign;
660 case 'p':
661 base = 16;
662 sharpflag = (width == 0);
663 sign = 0;
664 num = (uintptr_t)va_arg(ap, void *);
665 goto number;
666 case 'q':
667 qflag = 1;
668 goto reswitch;
669 case 'r':
670 base = radix;
671 if (sign)
672 goto handle_sign;
673 goto handle_nosign;
674 case 's':
675 p = va_arg(ap, char *);
676 if (p == NULL)
677 p = "(null)";
678 if (!dot)
679 n = strlen (p);
680 else
681 for (n = 0; n < dwidth && p[n]; n++)
682 continue;
683
684 width -= n;
685
686 if (!ladjust && width > 0)
687 while (width--)
688 PCHAR(padc);
689 while (n--)
690 PCHAR(*p++);
691 if (ladjust && width > 0)
692 while (width--)
693 PCHAR(padc);
694 break;
695 case 't':
696 tflag = 1;
697 goto reswitch;
698 case 'u':
699 base = 10;
700 goto handle_nosign;
701 case 'x':
702 case 'X':
703 base = 16;
704 goto handle_nosign;
705 case 'y':
706 base = 16;
707 sign = 1;
708 goto handle_sign;
709 case 'z':
710 zflag = 1;
711 goto reswitch;
712 handle_nosign:
713 sign = 0;
714 if (jflag)
715 num = va_arg(ap, uintmax_t);
716 else if (qflag)
717 num = va_arg(ap, u_quad_t);
718 else if (tflag)
719 num = va_arg(ap, ptrdiff_t);
720 else if (lflag)
721 num = va_arg(ap, u_long);
722 else if (zflag)
723 num = va_arg(ap, size_t);
724 else if (hflag)
725 num = (u_short)va_arg(ap, int);
726 else if (cflag)
727 num = (u_char)va_arg(ap, int);
728 else
729 num = va_arg(ap, u_int);
730 goto number;
731 handle_sign:
732 if (jflag)
733 num = va_arg(ap, intmax_t);
734 else if (qflag)
735 num = va_arg(ap, quad_t);
736 else if (tflag)
737 num = va_arg(ap, ptrdiff_t);
738 else if (lflag)
739 num = va_arg(ap, long);
740 else if (zflag)
741 num = va_arg(ap, size_t);
742 else if (hflag)
743 num = (short)va_arg(ap, int);
744 else if (cflag)
745 num = (char)va_arg(ap, int);
746 else
747 num = va_arg(ap, int);
748 number:
749 if (sign && (intmax_t)num < 0) {
750 neg = 1;
751 num = -(intmax_t)num;
752 }
753 p = ksprintn(nbuf, num, base, &tmp);
754 if (sharpflag && num != 0) {
755 if (base == 8)
756 tmp++;
757 else if (base == 16)
758 tmp += 2;
759 }
760 if (neg)
761 tmp++;
762
763 if (!ladjust && padc != '' && width
764 && (width -= tmp) > 0)
765 while (width--)
766 PCHAR(padc);
767 if (neg)
768 PCHAR('-');
769 if (sharpflag && num != 0) {
770 if (base == 8) {
771 PCHAR('');
772 } else if (base == 16) {
773 PCHAR('');
774 PCHAR('x');
775 }
776 }
777 if (!ladjust && width && (width -= tmp) > 0)
778 while (width--)
779 PCHAR(padc);
780
781 while (*p)
782 PCHAR(*p--);
783
784 if (ladjust && width && (width -= tmp) > 0)
785 while (width--)
786 PCHAR(padc);
787
788 break;
789 default:
790 while (percent < fmt)
791 PCHAR(*percent++);
792 /*
793 * Since we ignore an formatting argument it is no
794 * longer safe to obey the remaining formatting
795 * arguments as the arguments will no longer match
796 * the format specs.
797 */
798 stop = 1;
799 break;
800 }
801 }
802 #undef PCHAR
803 }
804
805 /*
806 * Put character in log buffer with a particular priority.
807 */
808 static void
809 msglogchar(int c, int pri)
810 {
811 static int lastpri = -1;
812 static int dangling;
813 char nbuf[MAXNBUF];
814 char *p;
815
816 if (!msgbufmapped)
817 return;
818 if (c == '\0' || c == '\r')
819 return;
820 if (pri != -1 && pri != lastpri) {
821 if (dangling) {
822 msgbuf_addchar(msgbufp, '\n');
823 dangling = 0;
824 }
825 msgbuf_addchar(msgbufp, '<');
826 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;)
827 msgbuf_addchar(msgbufp, *p--);
828 msgbuf_addchar(msgbufp, '>');
829 lastpri = pri;
830 }
831 msgbuf_addchar(msgbufp, c);
832 if (c == '\n') {
833 dangling = 0;
834 lastpri = -1;
835 } else {
836 dangling = 1;
837 }
838 }
839
840 void
841 msgbufinit(void *ptr, int size)
842 {
843 char *cp;
844 static struct msgbuf *oldp = NULL;
845
846 size -= sizeof(*msgbufp);
847 cp = (char *)ptr;
848 msgbufp = (struct msgbuf *)(cp + size);
849 msgbuf_reinit(msgbufp, cp, size);
850 if (msgbufmapped && oldp != msgbufp)
851 msgbuf_copy(oldp, msgbufp);
852 msgbufmapped = 1;
853 oldp = msgbufp;
854 }
855
856 SYSCTL_DECL(_security_bsd);
857
858 static int unprivileged_read_msgbuf = 1;
859 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
860 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
861 "Unprivileged processes may read the kernel message buffer");
862
863 /* Sysctls for accessing/clearing the msgbuf */
864 static int
865 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
866 {
867 char buf[128];
868 u_int seq;
869 int error, len;
870
871 if (!unprivileged_read_msgbuf) {
872 error = suser(req->td);
873 if (error)
874 return (error);
875 }
876
877 /* Read the whole buffer, one chunk at a time. */
878 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
879 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
880 error = sysctl_handle_opaque(oidp, buf, len, req);
881 if (error)
882 return (error);
883 }
884 return (0);
885 }
886
887 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
888 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
889
890 static int msgbuf_clearflag;
891
892 static int
893 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
894 {
895 int error;
896 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
897 if (!error && req->newptr) {
898 msgbuf_clear(msgbufp);
899 msgbuf_clearflag = 0;
900 }
901 return (error);
902 }
903
904 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
905 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
906 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
907
908 #ifdef DDB
909
910 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
911 {
912 int i, j, quit;
913
914 quit = 0;
915
916 if (!msgbufmapped) {
917 db_printf("msgbuf not mapped yet\n");
918 return;
919 }
920 db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
921 db_printf("msgbufp = %p\n", msgbufp);
922 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
923 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
924 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
925 for (i = 0; i < msgbufp->msg_size && !quit; i++) {
926 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
927 db_printf("%c", msgbufp->msg_ptr[j]);
928 }
929 db_printf("\n");
930 }
931
932 #endif /* DDB */
933
934 void
935 hexdump(const void *ptr, int length, const char *hdr, int flags)
936 {
937 int i, j, k;
938 int cols;
939 const unsigned char *cp;
940 char delim;
941
942 if ((flags & HD_DELIM_MASK) != 0)
943 delim = (flags & HD_DELIM_MASK) >> 8;
944 else
945 delim = ' ';
946
947 if ((flags & HD_COLUMN_MASK) != 0)
948 cols = flags & HD_COLUMN_MASK;
949 else
950 cols = 16;
951
952 cp = ptr;
953 for (i = 0; i < length; i+= cols) {
954 if (hdr != NULL)
955 printf("%s", hdr);
956
957 if ((flags & HD_OMIT_COUNT) == 0)
958 printf("%04x ", i);
959
960 if ((flags & HD_OMIT_HEX) == 0) {
961 for (j = 0; j < cols; j++) {
962 k = i + j;
963 if (k < length)
964 printf("%c%02x", delim, cp[k]);
965 else
966 printf(" ");
967 }
968 }
969
970 if ((flags & HD_OMIT_CHARS) == 0) {
971 printf(" |");
972 for (j = 0; j < cols; j++) {
973 k = i + j;
974 if (k >= length)
975 printf(" ");
976 else if (cp[k] >= ' ' && cp[k] <= '~')
977 printf("%c", cp[k]);
978 else
979 printf(".");
980 }
981 printf("|\n");
982 }
983 }
984 }
985
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