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/5.4/sys/kern/subr_prf.c 145335 2005-04-20 19:11:07Z 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 * It may block if the tty queue is overfull. No message is printed if
121 * the queue does not clear in a reasonable time.
122 */
123 int
124 uprintf(const char *fmt, ...)
125 {
126 struct thread *td = curthread;
127 struct proc *p = td->td_proc;
128 va_list ap;
129 struct putchar_arg pca;
130 int retval;
131
132 if (td == NULL || td == PCPU_GET(idlethread))
133 return (0);
134
135 p = td->td_proc;
136 PROC_LOCK(p);
137 if ((p->p_flag & P_CONTROLT) == 0) {
138 PROC_UNLOCK(p);
139 return (0);
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 return (0);
147 pca.flags = TOTTY;
148 va_start(ap, fmt);
149 retval = kvprintf(fmt, putchar, &pca, 10, ap);
150 va_end(ap);
151
152 return (retval);
153 }
154
155 /*
156 * tprintf prints on the controlling terminal associated
157 * with the given session, possibly to the log as well.
158 */
159 void
160 tprintf(struct proc *p, int pri, const char *fmt, ...)
161 {
162 struct tty *tp = NULL;
163 int flags = 0;
164 va_list ap;
165 struct putchar_arg pca;
166 struct session *sess = NULL;
167
168 if (pri != -1)
169 flags |= TOLOG;
170 if (p != NULL) {
171 PROC_LOCK(p);
172 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
173 sess = p->p_session;
174 SESS_LOCK(sess);
175 PROC_UNLOCK(p);
176 SESSHOLD(sess);
177 tp = sess->s_ttyp;
178 SESS_UNLOCK(sess);
179 if (ttycheckoutq(tp, 0))
180 flags |= TOTTY;
181 else
182 tp = NULL;
183 } else
184 PROC_UNLOCK(p);
185 }
186 pca.pri = pri;
187 pca.tty = tp;
188 pca.flags = flags;
189 va_start(ap, fmt);
190 kvprintf(fmt, putchar, &pca, 10, ap);
191 va_end(ap);
192 if (sess != NULL) {
193 SESS_LOCK(sess);
194 SESSRELE(sess);
195 SESS_UNLOCK(sess);
196 }
197 msgbuftrigger = 1;
198 }
199
200 /*
201 * Ttyprintf displays a message on a tty; it should be used only by
202 * the tty driver, or anything that knows the underlying tty will not
203 * be revoke(2)'d away. Other callers should use tprintf.
204 */
205 int
206 ttyprintf(struct tty *tp, const char *fmt, ...)
207 {
208 va_list ap;
209 struct putchar_arg pca;
210 int retval;
211
212 va_start(ap, fmt);
213 pca.tty = tp;
214 pca.flags = TOTTY;
215 retval = kvprintf(fmt, putchar, &pca, 10, ap);
216 va_end(ap);
217 return (retval);
218 }
219
220 /*
221 * Log writes to the log buffer, and guarantees not to sleep (so can be
222 * called by interrupt routines). If there is no process reading the
223 * log yet, it writes to the console also.
224 */
225 void
226 log(int level, const char *fmt, ...)
227 {
228 va_list ap;
229 struct putchar_arg pca;
230
231 pca.tty = NULL;
232 pca.pri = level;
233 pca.flags = log_open ? TOLOG : TOCONS;
234
235 va_start(ap, fmt);
236 kvprintf(fmt, putchar, &pca, 10, ap);
237 va_end(ap);
238
239 msgbuftrigger = 1;
240 }
241
242 #define CONSCHUNK 128
243
244 void
245 log_console(struct uio *uio)
246 {
247 int c, i, error, nl;
248 char *consbuffer;
249 int pri;
250
251 if (!log_console_output)
252 return;
253
254 pri = LOG_INFO | LOG_CONSOLE;
255 uio = cloneuio(uio);
256 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
257
258 nl = 0;
259 while (uio->uio_resid > 0) {
260 c = imin(uio->uio_resid, CONSCHUNK);
261 error = uiomove(consbuffer, c, uio);
262 if (error != 0)
263 break;
264 for (i = 0; i < c; i++) {
265 msglogchar(consbuffer[i], pri);
266 if (consbuffer[i] == '\n')
267 nl = 1;
268 else
269 nl = 0;
270 }
271 }
272 if (!nl)
273 msglogchar('\n', pri);
274 msgbuftrigger = 1;
275 free(uio, M_IOV);
276 free(consbuffer, M_TEMP);
277 return;
278 }
279
280 int
281 printf(const char *fmt, ...)
282 {
283 va_list ap;
284 int savintr;
285 struct putchar_arg pca;
286 int retval;
287
288 savintr = consintr; /* disable interrupts */
289 consintr = 0;
290 va_start(ap, fmt);
291 pca.tty = NULL;
292 pca.flags = TOCONS | TOLOG;
293 pca.pri = -1;
294 retval = kvprintf(fmt, putchar, &pca, 10, ap);
295 va_end(ap);
296 if (!panicstr)
297 msgbuftrigger = 1;
298 consintr = savintr; /* reenable interrupts */
299 return (retval);
300 }
301
302 int
303 vprintf(const char *fmt, va_list ap)
304 {
305 int savintr;
306 struct putchar_arg pca;
307 int retval;
308
309 savintr = consintr; /* disable interrupts */
310 consintr = 0;
311 pca.tty = NULL;
312 pca.flags = TOCONS | TOLOG;
313 pca.pri = -1;
314 retval = kvprintf(fmt, putchar, &pca, 10, ap);
315 if (!panicstr)
316 msgbuftrigger = 1;
317 consintr = savintr; /* reenable interrupts */
318 return (retval);
319 }
320
321 /*
322 * Print a character on console or users terminal. If destination is
323 * the console then the last bunch of characters are saved in msgbuf for
324 * inspection later.
325 */
326 static void
327 putchar(int c, void *arg)
328 {
329 struct putchar_arg *ap = (struct putchar_arg*) arg;
330 struct tty *tp = ap->tty;
331 int consdirect, flags = ap->flags;
332
333 consdirect = ((flags & TOCONS) && constty == NULL);
334 /* Don't use the tty code after a panic or while in ddb. */
335 if (panicstr)
336 consdirect = 1;
337 if (kdb_active)
338 consdirect = 1;
339 if (consdirect) {
340 if (c != '\0')
341 cnputc(c);
342 } else {
343 if ((flags & TOTTY) && tp != NULL)
344 tputchar(c, tp);
345 if (flags & TOCONS) {
346 if (constty != NULL)
347 msgbuf_addchar(&consmsgbuf, c);
348 if (always_console_output && c != '\0')
349 cnputc(c);
350 }
351 }
352 if ((flags & TOLOG))
353 msglogchar(c, ap->pri);
354 }
355
356 /*
357 * Scaled down version of sprintf(3).
358 */
359 int
360 sprintf(char *buf, const char *cfmt, ...)
361 {
362 int retval;
363 va_list ap;
364
365 va_start(ap, cfmt);
366 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
367 buf[retval] = '\0';
368 va_end(ap);
369 return (retval);
370 }
371
372 /*
373 * Scaled down version of vsprintf(3).
374 */
375 int
376 vsprintf(char *buf, const char *cfmt, va_list ap)
377 {
378 int retval;
379
380 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
381 buf[retval] = '\0';
382 return (retval);
383 }
384
385 /*
386 * Scaled down version of snprintf(3).
387 */
388 int
389 snprintf(char *str, size_t size, const char *format, ...)
390 {
391 int retval;
392 va_list ap;
393
394 va_start(ap, format);
395 retval = vsnprintf(str, size, format, ap);
396 va_end(ap);
397 return(retval);
398 }
399
400 /*
401 * Scaled down version of vsnprintf(3).
402 */
403 int
404 vsnprintf(char *str, size_t size, const char *format, va_list ap)
405 {
406 struct snprintf_arg info;
407 int retval;
408
409 info.str = str;
410 info.remain = size;
411 retval = kvprintf(format, snprintf_func, &info, 10, ap);
412 if (info.remain >= 1)
413 *info.str++ = '\0';
414 return (retval);
415 }
416
417 /*
418 * Kernel version which takes radix argument vsnprintf(3).
419 */
420 int
421 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
422 {
423 struct snprintf_arg info;
424 int retval;
425
426 info.str = str;
427 info.remain = size;
428 retval = kvprintf(format, snprintf_func, &info, radix, ap);
429 if (info.remain >= 1)
430 *info.str++ = '\0';
431 return (retval);
432 }
433
434 static void
435 snprintf_func(int ch, void *arg)
436 {
437 struct snprintf_arg *const info = arg;
438
439 if (info->remain >= 2) {
440 *info->str++ = ch;
441 info->remain--;
442 }
443 }
444
445 /*
446 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
447 * order; return an optional length and a pointer to the last character
448 * written in the buffer (i.e., the first character of the string).
449 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
450 */
451 static char *
452 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp)
453 {
454 char *p;
455
456 p = nbuf;
457 *p = '\0';
458 do {
459 *++p = hex2ascii(num % base);
460 } while (num /= base);
461 if (lenp)
462 *lenp = p - nbuf;
463 return (p);
464 }
465
466 /*
467 * Scaled down version of printf(3).
468 *
469 * Two additional formats:
470 *
471 * The format %b is supported to decode error registers.
472 * Its usage is:
473 *
474 * printf("reg=%b\n", regval, "<base><arg>*");
475 *
476 * where <base> is the output base expressed as a control character, e.g.
477 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
478 * the first of which gives the bit number to be inspected (origin 1), and
479 * the next characters (up to a control character, i.e. a character <= 32),
480 * give the name of the register. Thus:
481 *
482 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
483 *
484 * would produce output:
485 *
486 * reg=3<BITTWO,BITONE>
487 *
488 * XXX: %D -- Hexdump, takes pointer and separator string:
489 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
490 * ("%*D", len, ptr, " " -> XX XX XX XX ...
491 */
492 int
493 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
494 {
495 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
496 char nbuf[MAXNBUF];
497 char *d;
498 const char *p, *percent, *q;
499 u_char *up;
500 int ch, n;
501 uintmax_t num;
502 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
503 int cflag, hflag, jflag, tflag, zflag;
504 int dwidth;
505 char padc;
506 int retval = 0;
507
508 num = 0;
509 if (!func)
510 d = (char *) arg;
511 else
512 d = NULL;
513
514 if (fmt == NULL)
515 fmt = "(fmt null)\n";
516
517 if (radix < 2 || radix > 36)
518 radix = 10;
519
520 for (;;) {
521 padc = ' ';
522 width = 0;
523 while ((ch = (u_char)*fmt++) != '%') {
524 if (ch == '\0')
525 return (retval);
526 PCHAR(ch);
527 }
528 percent = fmt - 1;
529 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
530 sign = 0; dot = 0; dwidth = 0;
531 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
532 reswitch: switch (ch = (u_char)*fmt++) {
533 case '.':
534 dot = 1;
535 goto reswitch;
536 case '#':
537 sharpflag = 1;
538 goto reswitch;
539 case '+':
540 sign = 1;
541 goto reswitch;
542 case '-':
543 ladjust = 1;
544 goto reswitch;
545 case '%':
546 PCHAR(ch);
547 break;
548 case '*':
549 if (!dot) {
550 width = va_arg(ap, int);
551 if (width < 0) {
552 ladjust = !ladjust;
553 width = -width;
554 }
555 } else {
556 dwidth = va_arg(ap, int);
557 }
558 goto reswitch;
559 case '':
560 if (!dot) {
561 padc = '';
562 goto reswitch;
563 }
564 case '1': case '2': case '3': case '4':
565 case '5': case '6': case '7': case '8': case '9':
566 for (n = 0;; ++fmt) {
567 n = n * 10 + ch - '';
568 ch = *fmt;
569 if (ch < '' || ch > '9')
570 break;
571 }
572 if (dot)
573 dwidth = n;
574 else
575 width = n;
576 goto reswitch;
577 case 'b':
578 num = (u_int)va_arg(ap, int);
579 p = va_arg(ap, char *);
580 for (q = ksprintn(nbuf, num, *p++, NULL); *q;)
581 PCHAR(*q--);
582
583 if (num == 0)
584 break;
585
586 for (tmp = 0; *p;) {
587 n = *p++;
588 if (num & (1 << (n - 1))) {
589 PCHAR(tmp ? ',' : '<');
590 for (; (n = *p) > ' '; ++p)
591 PCHAR(n);
592 tmp = 1;
593 } else
594 for (; *p > ' '; ++p)
595 continue;
596 }
597 if (tmp)
598 PCHAR('>');
599 break;
600 case 'c':
601 PCHAR(va_arg(ap, int));
602 break;
603 case 'D':
604 up = va_arg(ap, u_char *);
605 p = va_arg(ap, char *);
606 if (!width)
607 width = 16;
608 while(width--) {
609 PCHAR(hex2ascii(*up >> 4));
610 PCHAR(hex2ascii(*up & 0x0f));
611 up++;
612 if (width)
613 for (q=p;*q;q++)
614 PCHAR(*q);
615 }
616 break;
617 case 'd':
618 case 'i':
619 base = 10;
620 sign = 1;
621 goto handle_sign;
622 case 'h':
623 if (hflag) {
624 hflag = 0;
625 cflag = 1;
626 } else
627 hflag = 1;
628 goto reswitch;
629 case 'j':
630 jflag = 1;
631 goto reswitch;
632 case 'l':
633 if (lflag) {
634 lflag = 0;
635 qflag = 1;
636 } else
637 lflag = 1;
638 goto reswitch;
639 case 'n':
640 if (jflag)
641 *(va_arg(ap, intmax_t *)) = retval;
642 else if (qflag)
643 *(va_arg(ap, quad_t *)) = retval;
644 else if (lflag)
645 *(va_arg(ap, long *)) = retval;
646 else if (zflag)
647 *(va_arg(ap, size_t *)) = retval;
648 else if (hflag)
649 *(va_arg(ap, short *)) = retval;
650 else if (cflag)
651 *(va_arg(ap, char *)) = retval;
652 else
653 *(va_arg(ap, int *)) = retval;
654 break;
655 case 'o':
656 base = 8;
657 goto handle_nosign;
658 case 'p':
659 base = 16;
660 sharpflag = (width == 0);
661 sign = 0;
662 num = (uintptr_t)va_arg(ap, void *);
663 goto number;
664 case 'q':
665 qflag = 1;
666 goto reswitch;
667 case 'r':
668 base = radix;
669 if (sign)
670 goto handle_sign;
671 goto handle_nosign;
672 case 's':
673 p = va_arg(ap, char *);
674 if (p == NULL)
675 p = "(null)";
676 if (!dot)
677 n = strlen (p);
678 else
679 for (n = 0; n < dwidth && p[n]; n++)
680 continue;
681
682 width -= n;
683
684 if (!ladjust && width > 0)
685 while (width--)
686 PCHAR(padc);
687 while (n--)
688 PCHAR(*p++);
689 if (ladjust && width > 0)
690 while (width--)
691 PCHAR(padc);
692 break;
693 case 't':
694 tflag = 1;
695 goto reswitch;
696 case 'u':
697 base = 10;
698 goto handle_nosign;
699 case 'x':
700 case 'X':
701 base = 16;
702 goto handle_nosign;
703 case 'y':
704 base = 16;
705 sign = 1;
706 goto handle_sign;
707 case 'z':
708 zflag = 1;
709 goto reswitch;
710 handle_nosign:
711 sign = 0;
712 if (jflag)
713 num = va_arg(ap, uintmax_t);
714 else if (qflag)
715 num = va_arg(ap, u_quad_t);
716 else if (tflag)
717 num = va_arg(ap, ptrdiff_t);
718 else if (lflag)
719 num = va_arg(ap, u_long);
720 else if (zflag)
721 num = va_arg(ap, size_t);
722 else if (hflag)
723 num = (u_short)va_arg(ap, int);
724 else if (cflag)
725 num = (u_char)va_arg(ap, int);
726 else
727 num = va_arg(ap, u_int);
728 goto number;
729 handle_sign:
730 if (jflag)
731 num = va_arg(ap, intmax_t);
732 else if (qflag)
733 num = va_arg(ap, quad_t);
734 else if (tflag)
735 num = va_arg(ap, ptrdiff_t);
736 else if (lflag)
737 num = va_arg(ap, long);
738 else if (zflag)
739 num = va_arg(ap, size_t);
740 else if (hflag)
741 num = (short)va_arg(ap, int);
742 else if (cflag)
743 num = (char)va_arg(ap, int);
744 else
745 num = va_arg(ap, int);
746 number:
747 if (sign && (intmax_t)num < 0) {
748 neg = 1;
749 num = -(intmax_t)num;
750 }
751 p = ksprintn(nbuf, num, base, &tmp);
752 if (sharpflag && num != 0) {
753 if (base == 8)
754 tmp++;
755 else if (base == 16)
756 tmp += 2;
757 }
758 if (neg)
759 tmp++;
760
761 if (!ladjust && width && (width -= tmp) > 0)
762 while (width--)
763 PCHAR(padc);
764 if (neg)
765 PCHAR('-');
766 if (sharpflag && num != 0) {
767 if (base == 8) {
768 PCHAR('');
769 } else if (base == 16) {
770 PCHAR('');
771 PCHAR('x');
772 }
773 }
774
775 while (*p)
776 PCHAR(*p--);
777
778 if (ladjust && width && (width -= tmp) > 0)
779 while (width--)
780 PCHAR(padc);
781
782 break;
783 default:
784 while (percent < fmt)
785 PCHAR(*percent++);
786 break;
787 }
788 }
789 #undef PCHAR
790 }
791
792 /*
793 * Put character in log buffer with a particular priority.
794 */
795 static void
796 msglogchar(int c, int pri)
797 {
798 static int lastpri = -1;
799 static int dangling;
800 char nbuf[MAXNBUF];
801 char *p;
802
803 if (!msgbufmapped)
804 return;
805 if (c == '\0' || c == '\r')
806 return;
807 if (pri != -1 && pri != lastpri) {
808 if (dangling) {
809 msgbuf_addchar(msgbufp, '\n');
810 dangling = 0;
811 }
812 msgbuf_addchar(msgbufp, '<');
813 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;)
814 msgbuf_addchar(msgbufp, *p--);
815 msgbuf_addchar(msgbufp, '>');
816 lastpri = pri;
817 }
818 msgbuf_addchar(msgbufp, c);
819 if (c == '\n') {
820 dangling = 0;
821 lastpri = -1;
822 } else {
823 dangling = 1;
824 }
825 }
826
827 void
828 msgbufinit(void *ptr, int size)
829 {
830 char *cp;
831 static struct msgbuf *oldp = NULL;
832
833 size -= sizeof(*msgbufp);
834 cp = (char *)ptr;
835 msgbufp = (struct msgbuf *)(cp + size);
836 msgbuf_reinit(msgbufp, cp, size);
837 if (msgbufmapped && oldp != msgbufp)
838 msgbuf_copy(oldp, msgbufp);
839 msgbufmapped = 1;
840 oldp = msgbufp;
841 }
842
843 SYSCTL_DECL(_security_bsd);
844
845 static int unprivileged_read_msgbuf = 1;
846 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
847 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
848 "Unprivileged processes may read the kernel message buffer");
849
850 /* Sysctls for accessing/clearing the msgbuf */
851 static int
852 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
853 {
854 char buf[128];
855 u_int seq;
856 int error, len;
857
858 if (!unprivileged_read_msgbuf) {
859 error = suser(req->td);
860 if (error)
861 return (error);
862 }
863
864 /* Read the whole buffer, one chunk at a time. */
865 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
866 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
867 error = sysctl_handle_opaque(oidp, buf, len, req);
868 if (error)
869 return (error);
870 }
871 return (0);
872 }
873
874 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
875 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
876
877 static int msgbuf_clearflag;
878
879 static int
880 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
881 {
882 int error;
883 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
884 if (!error && req->newptr) {
885 msgbuf_clear(msgbufp);
886 msgbuf_clearflag = 0;
887 }
888 return (error);
889 }
890
891 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
892 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
893 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
894
895 #ifdef DDB
896
897 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
898 {
899 int i, j;
900
901 if (!msgbufmapped) {
902 db_printf("msgbuf not mapped yet\n");
903 return;
904 }
905 db_printf("msgbufp = %p\n", msgbufp);
906 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
907 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
908 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
909 for (i = 0; i < msgbufp->msg_size; i++) {
910 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
911 db_printf("%c", msgbufp->msg_ptr[j]);
912 }
913 db_printf("\n");
914 }
915
916 #endif /* DDB */
917
918 void
919 hexdump(void *ptr, int length, const char *hdr, int flags)
920 {
921 int i, j, k;
922 int cols;
923 unsigned char *cp;
924 char delim;
925
926 if ((flags & HD_DELIM_MASK) != 0)
927 delim = (flags & HD_DELIM_MASK) >> 8;
928 else
929 delim = ' ';
930
931 if ((flags & HD_COLUMN_MASK) != 0)
932 cols = flags & HD_COLUMN_MASK;
933 else
934 cols = 16;
935
936 cp = ptr;
937 for (i = 0; i < length; i+= cols) {
938 if (hdr != NULL)
939 printf("%s", hdr);
940
941 if ((flags & HD_OMIT_COUNT) == 0)
942 printf("%04x ", i);
943
944 if ((flags & HD_OMIT_HEX) == 0) {
945 for (j = 0; j < cols; j++) {
946 k = i + j;
947 if (k < length)
948 printf("%c%02x", delim, cp[k]);
949 else
950 printf(" ");
951 }
952 }
953
954 if ((flags & HD_OMIT_CHARS) == 0) {
955 printf(" |");
956 for (j = 0; j < cols; j++) {
957 k = i + j;
958 if (k >= length)
959 printf(" ");
960 else if (cp[k] >= ' ' && cp[k] <= '~')
961 printf("%c", cp[k]);
962 else
963 printf(".");
964 }
965 printf("|\n");
966 }
967 }
968 }
969
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