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/7.3/sys/kern/subr_prf.c 187506 2009-01-21 00:26:45Z delphij $");
39
40 #include "opt_ddb.h"
41 #include "opt_printf.h"
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/lock.h>
46 #include <sys/kdb.h>
47 #include <sys/mutex.h>
48 #include <sys/sx.h>
49 #include <sys/kernel.h>
50 #include <sys/msgbuf.h>
51 #include <sys/malloc.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/stddef.h>
55 #include <sys/sysctl.h>
56 #include <sys/tty.h>
57 #include <sys/syslog.h>
58 #include <sys/cons.h>
59 #include <sys/uio.h>
60 #include <sys/ctype.h>
61
62 #ifdef DDB
63 #include <ddb/ddb.h>
64 #endif
65
66 /*
67 * Note that stdarg.h and the ANSI style va_start macro is used for both
68 * ANSI and traditional C compilers.
69 */
70 #include <machine/stdarg.h>
71
72 #define TOCONS 0x01
73 #define TOTTY 0x02
74 #define TOLOG 0x04
75
76 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
77 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
78
79 struct putchar_arg {
80 int flags;
81 int pri;
82 struct tty *tty;
83 char *p_bufr;
84 size_t n_bufr;
85 char *p_next;
86 size_t remain;
87 };
88
89 struct snprintf_arg {
90 char *str;
91 size_t remain;
92 };
93
94 extern int log_open;
95
96 static void msglogchar(int c, int pri);
97 static void putchar(int ch, void *arg);
98 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
99 static void snprintf_func(int ch, void *arg);
100
101 static int msgbufmapped; /* Set when safe to use msgbuf */
102 int msgbuftrigger;
103
104 static int log_console_output = 1;
105 TUNABLE_INT("kern.log_console_output", &log_console_output);
106 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
107 &log_console_output, 0, "Duplicate console output to the syslog.");
108
109 static int always_console_output = 0;
110 TUNABLE_INT("kern.always_console_output", &always_console_output);
111 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
112 &always_console_output, 0, "Always output to console despite TIOCCONS.");
113
114 /*
115 * Warn that a system table is full.
116 */
117 void
118 tablefull(const char *tab)
119 {
120
121 log(LOG_ERR, "%s: table is full\n", tab);
122 }
123
124 /*
125 * Uprintf prints to the controlling terminal for the current process.
126 */
127 int
128 uprintf(const char *fmt, ...)
129 {
130 struct thread *td = curthread;
131 struct proc *p = td->td_proc;
132 va_list ap;
133 struct putchar_arg pca;
134 int retval;
135
136 if (td == NULL || TD_IS_IDLETHREAD(td))
137 return (0);
138
139 mtx_lock(&Giant);
140 p = td->td_proc;
141 PROC_LOCK(p);
142 if ((p->p_flag & P_CONTROLT) == 0) {
143 PROC_UNLOCK(p);
144 retval = 0;
145 goto out;
146 }
147 SESS_LOCK(p->p_session);
148 pca.tty = p->p_session->s_ttyp;
149 SESS_UNLOCK(p->p_session);
150 PROC_UNLOCK(p);
151 if (pca.tty == NULL) {
152 retval = 0;
153 goto out;
154 }
155 pca.flags = TOTTY;
156 va_start(ap, fmt);
157 retval = kvprintf(fmt, putchar, &pca, 10, ap);
158 va_end(ap);
159 out:
160 mtx_unlock(&Giant);
161 return (retval);
162 }
163
164 /*
165 * tprintf prints on the controlling terminal associated with the given
166 * session, possibly to the log as well.
167 */
168 void
169 tprintf(struct proc *p, int pri, const char *fmt, ...)
170 {
171 struct tty *tp = NULL;
172 int flags = 0;
173 va_list ap;
174 struct putchar_arg pca;
175 struct session *sess = NULL;
176
177 mtx_lock(&Giant);
178 if (pri != -1)
179 flags |= TOLOG;
180 if (p != NULL) {
181 PROC_LOCK(p);
182 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
183 sess = p->p_session;
184 SESS_LOCK(sess);
185 PROC_UNLOCK(p);
186 SESSHOLD(sess);
187 tp = sess->s_ttyp;
188 SESS_UNLOCK(sess);
189 if (ttycheckoutq(tp, 0))
190 flags |= TOTTY;
191 else
192 tp = NULL;
193 } else
194 PROC_UNLOCK(p);
195 }
196 pca.pri = pri;
197 pca.tty = tp;
198 pca.flags = flags;
199 va_start(ap, fmt);
200 kvprintf(fmt, putchar, &pca, 10, ap);
201 va_end(ap);
202 if (sess != NULL)
203 SESSRELE(sess);
204 msgbuftrigger = 1;
205 mtx_unlock(&Giant);
206 }
207
208 /*
209 * Ttyprintf displays a message on a tty; it should be used only by
210 * the tty driver, or anything that knows the underlying tty will not
211 * be revoke(2)'d away. Other callers should use tprintf.
212 */
213 int
214 ttyprintf(struct tty *tp, const char *fmt, ...)
215 {
216 va_list ap;
217 struct putchar_arg pca;
218 int retval;
219
220 va_start(ap, fmt);
221 pca.tty = tp;
222 pca.flags = TOTTY;
223 retval = kvprintf(fmt, putchar, &pca, 10, ap);
224 va_end(ap);
225 return (retval);
226 }
227
228 /*
229 * Log writes to the log buffer, and guarantees not to sleep (so can be
230 * called by interrupt routines). If there is no process reading the
231 * log yet, it writes to the console also.
232 */
233 void
234 log(int level, const char *fmt, ...)
235 {
236 va_list ap;
237 struct putchar_arg pca;
238
239 pca.tty = NULL;
240 pca.pri = level;
241 pca.flags = log_open ? TOLOG : TOCONS;
242 pca.p_bufr = NULL;
243
244 va_start(ap, fmt);
245 kvprintf(fmt, putchar, &pca, 10, ap);
246 va_end(ap);
247
248 msgbuftrigger = 1;
249 }
250
251 #define CONSCHUNK 128
252
253 void
254 log_console(struct uio *uio)
255 {
256 int c, i, error, nl;
257 char *consbuffer;
258 int pri;
259
260 if (!log_console_output)
261 return;
262
263 pri = LOG_INFO | LOG_CONSOLE;
264 uio = cloneuio(uio);
265 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
266
267 nl = 0;
268 while (uio->uio_resid > 0) {
269 c = imin(uio->uio_resid, CONSCHUNK);
270 error = uiomove(consbuffer, c, uio);
271 if (error != 0)
272 break;
273 for (i = 0; i < c; i++) {
274 msglogchar(consbuffer[i], pri);
275 if (consbuffer[i] == '\n')
276 nl = 1;
277 else
278 nl = 0;
279 }
280 }
281 if (!nl)
282 msglogchar('\n', pri);
283 msgbuftrigger = 1;
284 free(uio, M_IOV);
285 free(consbuffer, M_TEMP);
286 return;
287 }
288
289 int
290 printf(const char *fmt, ...)
291 {
292 va_list ap;
293 struct putchar_arg pca;
294 int retval;
295 #ifdef PRINTF_BUFR_SIZE
296 char bufr[PRINTF_BUFR_SIZE];
297 #endif
298
299 va_start(ap, fmt);
300 pca.tty = NULL;
301 pca.flags = TOCONS | TOLOG;
302 pca.pri = -1;
303 #ifdef PRINTF_BUFR_SIZE
304 pca.p_bufr = bufr;
305 pca.p_next = pca.p_bufr;
306 pca.n_bufr = sizeof(bufr);
307 pca.remain = sizeof(bufr);
308 *pca.p_next = '\0';
309 #else
310 /* Don't buffer console output. */
311 pca.p_bufr = NULL;
312 #endif
313
314 retval = kvprintf(fmt, putchar, &pca, 10, ap);
315 va_end(ap);
316
317 #ifdef PRINTF_BUFR_SIZE
318 /* Write any buffered console output: */
319 if (*pca.p_bufr != '\0')
320 cnputs(pca.p_bufr);
321 #endif
322
323 if (!panicstr)
324 msgbuftrigger = 1;
325
326 return (retval);
327 }
328
329 int
330 vprintf(const char *fmt, va_list ap)
331 {
332 struct putchar_arg pca;
333 int retval;
334 #ifdef PRINTF_BUFR_SIZE
335 char bufr[PRINTF_BUFR_SIZE];
336 #endif
337
338 pca.tty = NULL;
339 pca.flags = TOCONS | TOLOG;
340 pca.pri = -1;
341 #ifdef PRINTF_BUFR_SIZE
342 pca.p_bufr = bufr;
343 pca.p_next = pca.p_bufr;
344 pca.n_bufr = sizeof(bufr);
345 pca.remain = sizeof(bufr);
346 *pca.p_next = '\0';
347 #else
348 /* Don't buffer console output. */
349 pca.p_bufr = NULL;
350 #endif
351
352 retval = kvprintf(fmt, putchar, &pca, 10, ap);
353
354 #ifdef PRINTF_BUFR_SIZE
355 /* Write any buffered console output: */
356 if (*pca.p_bufr != '\0')
357 cnputs(pca.p_bufr);
358 #endif
359
360 if (!panicstr)
361 msgbuftrigger = 1;
362
363 return (retval);
364 }
365
366 static void
367 putcons(int c, struct putchar_arg *ap)
368 {
369 /* Check if no console output buffer was provided. */
370 if (ap->p_bufr == NULL)
371 /* Output direct to the console. */
372 cnputc(c);
373 else {
374 /* Buffer the character: */
375 if (c == '\n') {
376 *ap->p_next++ = '\r';
377 ap->remain--;
378 }
379 *ap->p_next++ = c;
380 ap->remain--;
381
382 /* Always leave the buffer zero terminated. */
383 *ap->p_next = '\0';
384
385 /* Check if the buffer needs to be flushed. */
386 if (ap->remain < 3 || c == '\n') {
387 cnputs(ap->p_bufr);
388 ap->p_next = ap->p_bufr;
389 ap->remain = ap->n_bufr;
390 *ap->p_next = '\0';
391 }
392 }
393 }
394
395 /*
396 * Print a character on console or users terminal. If destination is
397 * the console then the last bunch of characters are saved in msgbuf for
398 * inspection later.
399 */
400 static void
401 putchar(int c, void *arg)
402 {
403 struct putchar_arg *ap = (struct putchar_arg*) arg;
404 struct tty *tp = ap->tty;
405 int flags = ap->flags;
406
407 /* Don't use the tty code after a panic or while in ddb. */
408 if (kdb_active) {
409 if (c != '\0')
410 cnputc(c);
411 } else if (panicstr || ((flags & TOCONS) && constty == NULL)) {
412 if (c != '\0')
413 putcons(c, ap);
414 } else {
415 if ((flags & TOTTY) && tp != NULL)
416 tputchar(c, tp);
417 if (flags & TOCONS) {
418 if (constty != NULL)
419 msgbuf_addchar(&consmsgbuf, c);
420 if (always_console_output && c != '\0')
421 putcons(c, ap);
422 }
423 }
424 if ((flags & TOLOG))
425 msglogchar(c, ap->pri);
426 }
427
428 /*
429 * Scaled down version of sprintf(3).
430 */
431 int
432 sprintf(char *buf, const char *cfmt, ...)
433 {
434 int retval;
435 va_list ap;
436
437 va_start(ap, cfmt);
438 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
439 buf[retval] = '\0';
440 va_end(ap);
441 return (retval);
442 }
443
444 /*
445 * Scaled down version of vsprintf(3).
446 */
447 int
448 vsprintf(char *buf, const char *cfmt, va_list ap)
449 {
450 int retval;
451
452 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
453 buf[retval] = '\0';
454 return (retval);
455 }
456
457 /*
458 * Scaled down version of snprintf(3).
459 */
460 int
461 snprintf(char *str, size_t size, const char *format, ...)
462 {
463 int retval;
464 va_list ap;
465
466 va_start(ap, format);
467 retval = vsnprintf(str, size, format, ap);
468 va_end(ap);
469 return(retval);
470 }
471
472 /*
473 * Scaled down version of vsnprintf(3).
474 */
475 int
476 vsnprintf(char *str, size_t size, const char *format, va_list ap)
477 {
478 struct snprintf_arg info;
479 int retval;
480
481 info.str = str;
482 info.remain = size;
483 retval = kvprintf(format, snprintf_func, &info, 10, ap);
484 if (info.remain >= 1)
485 *info.str++ = '\0';
486 return (retval);
487 }
488
489 /*
490 * Kernel version which takes radix argument vsnprintf(3).
491 */
492 int
493 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
494 {
495 struct snprintf_arg info;
496 int retval;
497
498 info.str = str;
499 info.remain = size;
500 retval = kvprintf(format, snprintf_func, &info, radix, ap);
501 if (info.remain >= 1)
502 *info.str++ = '\0';
503 return (retval);
504 }
505
506 static void
507 snprintf_func(int ch, void *arg)
508 {
509 struct snprintf_arg *const info = arg;
510
511 if (info->remain >= 2) {
512 *info->str++ = ch;
513 info->remain--;
514 }
515 }
516
517 /*
518 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
519 * order; return an optional length and a pointer to the last character
520 * written in the buffer (i.e., the first character of the string).
521 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
522 */
523 static char *
524 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
525 {
526 char *p, c;
527
528 p = nbuf;
529 *p = '\0';
530 do {
531 c = hex2ascii(num % base);
532 *++p = upper ? toupper(c) : c;
533 } while (num /= base);
534 if (lenp)
535 *lenp = p - nbuf;
536 return (p);
537 }
538
539 /*
540 * Scaled down version of printf(3).
541 *
542 * Two additional formats:
543 *
544 * The format %b is supported to decode error registers.
545 * Its usage is:
546 *
547 * printf("reg=%b\n", regval, "<base><arg>*");
548 *
549 * where <base> is the output base expressed as a control character, e.g.
550 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
551 * the first of which gives the bit number to be inspected (origin 1), and
552 * the next characters (up to a control character, i.e. a character <= 32),
553 * give the name of the register. Thus:
554 *
555 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
556 *
557 * would produce output:
558 *
559 * reg=3<BITTWO,BITONE>
560 *
561 * XXX: %D -- Hexdump, takes pointer and separator string:
562 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
563 * ("%*D", len, ptr, " " -> XX XX XX XX ...
564 */
565 int
566 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
567 {
568 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
569 char nbuf[MAXNBUF];
570 char *d;
571 const char *p, *percent, *q;
572 u_char *up;
573 int ch, n;
574 uintmax_t num;
575 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
576 int cflag, hflag, jflag, tflag, zflag;
577 int dwidth, upper;
578 char padc;
579 int stop = 0, retval = 0;
580
581 num = 0;
582 if (!func)
583 d = (char *) arg;
584 else
585 d = NULL;
586
587 if (fmt == NULL)
588 fmt = "(fmt null)\n";
589
590 if (radix < 2 || radix > 36)
591 radix = 10;
592
593 for (;;) {
594 padc = ' ';
595 width = 0;
596 while ((ch = (u_char)*fmt++) != '%' || stop) {
597 if (ch == '\0')
598 return (retval);
599 PCHAR(ch);
600 }
601 percent = fmt - 1;
602 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
603 sign = 0; dot = 0; dwidth = 0; upper = 0;
604 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
605 reswitch: switch (ch = (u_char)*fmt++) {
606 case '.':
607 dot = 1;
608 goto reswitch;
609 case '#':
610 sharpflag = 1;
611 goto reswitch;
612 case '+':
613 sign = 1;
614 goto reswitch;
615 case '-':
616 ladjust = 1;
617 goto reswitch;
618 case '%':
619 PCHAR(ch);
620 break;
621 case '*':
622 if (!dot) {
623 width = va_arg(ap, int);
624 if (width < 0) {
625 ladjust = !ladjust;
626 width = -width;
627 }
628 } else {
629 dwidth = va_arg(ap, int);
630 }
631 goto reswitch;
632 case '':
633 if (!dot) {
634 padc = '';
635 goto reswitch;
636 }
637 case '1': case '2': case '3': case '4':
638 case '5': case '6': case '7': case '8': case '9':
639 for (n = 0;; ++fmt) {
640 n = n * 10 + ch - '';
641 ch = *fmt;
642 if (ch < '' || ch > '9')
643 break;
644 }
645 if (dot)
646 dwidth = n;
647 else
648 width = n;
649 goto reswitch;
650 case 'b':
651 num = (u_int)va_arg(ap, int);
652 p = va_arg(ap, char *);
653 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
654 PCHAR(*q--);
655
656 if (num == 0)
657 break;
658
659 for (tmp = 0; *p;) {
660 n = *p++;
661 if (num & (1 << (n - 1))) {
662 PCHAR(tmp ? ',' : '<');
663 for (; (n = *p) > ' '; ++p)
664 PCHAR(n);
665 tmp = 1;
666 } else
667 for (; *p > ' '; ++p)
668 continue;
669 }
670 if (tmp)
671 PCHAR('>');
672 break;
673 case 'c':
674 PCHAR(va_arg(ap, int));
675 break;
676 case 'D':
677 up = va_arg(ap, u_char *);
678 p = va_arg(ap, char *);
679 if (!width)
680 width = 16;
681 while(width--) {
682 PCHAR(hex2ascii(*up >> 4));
683 PCHAR(hex2ascii(*up & 0x0f));
684 up++;
685 if (width)
686 for (q=p;*q;q++)
687 PCHAR(*q);
688 }
689 break;
690 case 'd':
691 case 'i':
692 base = 10;
693 sign = 1;
694 goto handle_sign;
695 case 'h':
696 if (hflag) {
697 hflag = 0;
698 cflag = 1;
699 } else
700 hflag = 1;
701 goto reswitch;
702 case 'j':
703 jflag = 1;
704 goto reswitch;
705 case 'l':
706 if (lflag) {
707 lflag = 0;
708 qflag = 1;
709 } else
710 lflag = 1;
711 goto reswitch;
712 case 'n':
713 if (jflag)
714 *(va_arg(ap, intmax_t *)) = retval;
715 else if (qflag)
716 *(va_arg(ap, quad_t *)) = retval;
717 else if (lflag)
718 *(va_arg(ap, long *)) = retval;
719 else if (zflag)
720 *(va_arg(ap, size_t *)) = retval;
721 else if (hflag)
722 *(va_arg(ap, short *)) = retval;
723 else if (cflag)
724 *(va_arg(ap, char *)) = retval;
725 else
726 *(va_arg(ap, int *)) = retval;
727 break;
728 case 'o':
729 base = 8;
730 goto handle_nosign;
731 case 'p':
732 base = 16;
733 sharpflag = (width == 0);
734 sign = 0;
735 num = (uintptr_t)va_arg(ap, void *);
736 goto number;
737 case 'q':
738 qflag = 1;
739 goto reswitch;
740 case 'r':
741 base = radix;
742 if (sign)
743 goto handle_sign;
744 goto handle_nosign;
745 case 's':
746 p = va_arg(ap, char *);
747 if (p == NULL)
748 p = "(null)";
749 if (!dot)
750 n = strlen (p);
751 else
752 for (n = 0; n < dwidth && p[n]; n++)
753 continue;
754
755 width -= n;
756
757 if (!ladjust && width > 0)
758 while (width--)
759 PCHAR(padc);
760 while (n--)
761 PCHAR(*p++);
762 if (ladjust && width > 0)
763 while (width--)
764 PCHAR(padc);
765 break;
766 case 't':
767 tflag = 1;
768 goto reswitch;
769 case 'u':
770 base = 10;
771 goto handle_nosign;
772 case 'X':
773 upper = 1;
774 case 'x':
775 base = 16;
776 goto handle_nosign;
777 case 'y':
778 base = 16;
779 sign = 1;
780 goto handle_sign;
781 case 'z':
782 zflag = 1;
783 goto reswitch;
784 handle_nosign:
785 sign = 0;
786 if (jflag)
787 num = va_arg(ap, uintmax_t);
788 else if (qflag)
789 num = va_arg(ap, u_quad_t);
790 else if (tflag)
791 num = va_arg(ap, ptrdiff_t);
792 else if (lflag)
793 num = va_arg(ap, u_long);
794 else if (zflag)
795 num = va_arg(ap, size_t);
796 else if (hflag)
797 num = (u_short)va_arg(ap, int);
798 else if (cflag)
799 num = (u_char)va_arg(ap, int);
800 else
801 num = va_arg(ap, u_int);
802 goto number;
803 handle_sign:
804 if (jflag)
805 num = va_arg(ap, intmax_t);
806 else if (qflag)
807 num = va_arg(ap, quad_t);
808 else if (tflag)
809 num = va_arg(ap, ptrdiff_t);
810 else if (lflag)
811 num = va_arg(ap, long);
812 else if (zflag)
813 num = va_arg(ap, ssize_t);
814 else if (hflag)
815 num = (short)va_arg(ap, int);
816 else if (cflag)
817 num = (char)va_arg(ap, int);
818 else
819 num = va_arg(ap, int);
820 number:
821 if (sign && (intmax_t)num < 0) {
822 neg = 1;
823 num = -(intmax_t)num;
824 }
825 p = ksprintn(nbuf, num, base, &tmp, upper);
826 if (sharpflag && num != 0) {
827 if (base == 8)
828 tmp++;
829 else if (base == 16)
830 tmp += 2;
831 }
832 if (neg)
833 tmp++;
834
835 if (!ladjust && padc != '' && width
836 && (width -= tmp) > 0)
837 while (width--)
838 PCHAR(padc);
839 if (neg)
840 PCHAR('-');
841 if (sharpflag && num != 0) {
842 if (base == 8) {
843 PCHAR('');
844 } else if (base == 16) {
845 PCHAR('');
846 PCHAR('x');
847 }
848 }
849 if (!ladjust && width && (width -= tmp) > 0)
850 while (width--)
851 PCHAR(padc);
852
853 while (*p)
854 PCHAR(*p--);
855
856 if (ladjust && width && (width -= tmp) > 0)
857 while (width--)
858 PCHAR(padc);
859
860 break;
861 default:
862 while (percent < fmt)
863 PCHAR(*percent++);
864 /*
865 * Since we ignore an formatting argument it is no
866 * longer safe to obey the remaining formatting
867 * arguments as the arguments will no longer match
868 * the format specs.
869 */
870 stop = 1;
871 break;
872 }
873 }
874 #undef PCHAR
875 }
876
877 /*
878 * Put character in log buffer with a particular priority.
879 */
880 static void
881 msglogchar(int c, int pri)
882 {
883 static int lastpri = -1;
884 static int dangling;
885 char nbuf[MAXNBUF];
886 char *p;
887
888 if (!msgbufmapped)
889 return;
890 if (c == '\0' || c == '\r')
891 return;
892 if (pri != -1 && pri != lastpri) {
893 if (dangling) {
894 msgbuf_addchar(msgbufp, '\n');
895 dangling = 0;
896 }
897 msgbuf_addchar(msgbufp, '<');
898 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
899 msgbuf_addchar(msgbufp, *p--);
900 msgbuf_addchar(msgbufp, '>');
901 lastpri = pri;
902 }
903 msgbuf_addchar(msgbufp, c);
904 if (c == '\n') {
905 dangling = 0;
906 lastpri = -1;
907 } else {
908 dangling = 1;
909 }
910 }
911
912 void
913 msgbufinit(void *ptr, int size)
914 {
915 char *cp;
916 static struct msgbuf *oldp = NULL;
917
918 size -= sizeof(*msgbufp);
919 cp = (char *)ptr;
920 msgbufp = (struct msgbuf *)(cp + size);
921 msgbuf_reinit(msgbufp, cp, size);
922 if (msgbufmapped && oldp != msgbufp)
923 msgbuf_copy(oldp, msgbufp);
924 msgbufmapped = 1;
925 oldp = msgbufp;
926 }
927
928 static int unprivileged_read_msgbuf = 1;
929 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
930 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
931 "Unprivileged processes may read the kernel message buffer");
932
933 /* Sysctls for accessing/clearing the msgbuf */
934 static int
935 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
936 {
937 char buf[128];
938 u_int seq;
939 int error, len;
940
941 if (!unprivileged_read_msgbuf) {
942 error = priv_check(req->td, PRIV_MSGBUF);
943 if (error)
944 return (error);
945 }
946
947 /* Read the whole buffer, one chunk at a time. */
948 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
949 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
950 error = sysctl_handle_opaque(oidp, buf, len, req);
951 if (error)
952 return (error);
953 }
954 return (0);
955 }
956
957 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
958 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
959
960 static int msgbuf_clearflag;
961
962 static int
963 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
964 {
965 int error;
966 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
967 if (!error && req->newptr) {
968 msgbuf_clear(msgbufp);
969 msgbuf_clearflag = 0;
970 }
971 return (error);
972 }
973
974 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
975 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
976 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
977
978 #ifdef DDB
979
980 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
981 {
982 int i, j;
983
984 if (!msgbufmapped) {
985 db_printf("msgbuf not mapped yet\n");
986 return;
987 }
988 db_printf("msgbufp = %p\n", msgbufp);
989 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
990 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
991 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
992 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
993 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
994 db_printf("%c", msgbufp->msg_ptr[j]);
995 }
996 db_printf("\n");
997 }
998
999 #endif /* DDB */
1000
1001 void
1002 hexdump(const void *ptr, int length, const char *hdr, int flags)
1003 {
1004 int i, j, k;
1005 int cols;
1006 const unsigned char *cp;
1007 char delim;
1008
1009 if ((flags & HD_DELIM_MASK) != 0)
1010 delim = (flags & HD_DELIM_MASK) >> 8;
1011 else
1012 delim = ' ';
1013
1014 if ((flags & HD_COLUMN_MASK) != 0)
1015 cols = flags & HD_COLUMN_MASK;
1016 else
1017 cols = 16;
1018
1019 cp = ptr;
1020 for (i = 0; i < length; i+= cols) {
1021 if (hdr != NULL)
1022 printf("%s", hdr);
1023
1024 if ((flags & HD_OMIT_COUNT) == 0)
1025 printf("%04x ", i);
1026
1027 if ((flags & HD_OMIT_HEX) == 0) {
1028 for (j = 0; j < cols; j++) {
1029 k = i + j;
1030 if (k < length)
1031 printf("%c%02x", delim, cp[k]);
1032 else
1033 printf(" ");
1034 }
1035 }
1036
1037 if ((flags & HD_OMIT_CHARS) == 0) {
1038 printf(" |");
1039 for (j = 0; j < cols; j++) {
1040 k = i + j;
1041 if (k >= length)
1042 printf(" ");
1043 else if (cp[k] >= ' ' && cp[k] <= '~')
1044 printf("%c", cp[k]);
1045 else
1046 printf(".");
1047 }
1048 printf("|");
1049 }
1050 printf("\n");
1051 }
1052 }
1053
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