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/9.0/sys/kern/subr_prf.c 222804 2011-06-07 05:04:37Z ken $");
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 msglogstr(char *str, int pri, int filter_cr);
98 static void putchar(int ch, void *arg);
99 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
100 static void snprintf_func(int ch, void *arg);
101
102 static int msgbufmapped; /* Set when safe to use msgbuf */
103 int msgbuftrigger;
104
105 static int log_console_output = 1;
106 TUNABLE_INT("kern.log_console_output", &log_console_output);
107 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
108 &log_console_output, 0, "Duplicate console output to the syslog.");
109
110 /*
111 * See the comment in log_console() below for more explanation of this.
112 */
113 static int log_console_add_linefeed = 0;
114 TUNABLE_INT("kern.log_console_add_linefeed", &log_console_add_linefeed);
115 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RW,
116 &log_console_add_linefeed, 0, "log_console() adds extra newlines.");
117
118 static int always_console_output = 0;
119 TUNABLE_INT("kern.always_console_output", &always_console_output);
120 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
121 &always_console_output, 0, "Always output to console despite TIOCCONS.");
122
123 /*
124 * Warn that a system table is full.
125 */
126 void
127 tablefull(const char *tab)
128 {
129
130 log(LOG_ERR, "%s: table is full\n", tab);
131 }
132
133 /*
134 * Uprintf prints to the controlling terminal for the current process.
135 */
136 int
137 uprintf(const char *fmt, ...)
138 {
139 va_list ap;
140 struct putchar_arg pca;
141 struct proc *p;
142 struct thread *td;
143 int retval;
144
145 td = curthread;
146 if (TD_IS_IDLETHREAD(td))
147 return (0);
148
149 sx_slock(&proctree_lock);
150 p = td->td_proc;
151 PROC_LOCK(p);
152 if ((p->p_flag & P_CONTROLT) == 0) {
153 PROC_UNLOCK(p);
154 retval = 0;
155 goto out;
156 }
157 SESS_LOCK(p->p_session);
158 pca.tty = p->p_session->s_ttyp;
159 SESS_UNLOCK(p->p_session);
160 PROC_UNLOCK(p);
161 if (pca.tty == NULL) {
162 retval = 0;
163 goto out;
164 }
165 pca.flags = TOTTY;
166 pca.p_bufr = NULL;
167 va_start(ap, fmt);
168 tty_lock(pca.tty);
169 retval = kvprintf(fmt, putchar, &pca, 10, ap);
170 tty_unlock(pca.tty);
171 va_end(ap);
172 out:
173 sx_sunlock(&proctree_lock);
174 return (retval);
175 }
176
177 /*
178 * tprintf prints on the controlling terminal associated with the given
179 * session, possibly to the log as well.
180 */
181 void
182 tprintf(struct proc *p, int pri, const char *fmt, ...)
183 {
184 struct tty *tp = NULL;
185 int flags = 0;
186 va_list ap;
187 struct putchar_arg pca;
188 struct session *sess = NULL;
189
190 sx_slock(&proctree_lock);
191 if (pri != -1)
192 flags |= TOLOG;
193 if (p != NULL) {
194 PROC_LOCK(p);
195 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
196 sess = p->p_session;
197 sess_hold(sess);
198 PROC_UNLOCK(p);
199 tp = sess->s_ttyp;
200 if (tp != NULL && tty_checkoutq(tp))
201 flags |= TOTTY;
202 else
203 tp = NULL;
204 } else
205 PROC_UNLOCK(p);
206 }
207 pca.pri = pri;
208 pca.tty = tp;
209 pca.flags = flags;
210 pca.p_bufr = NULL;
211 va_start(ap, fmt);
212 if (pca.tty != NULL)
213 tty_lock(pca.tty);
214 kvprintf(fmt, putchar, &pca, 10, ap);
215 if (pca.tty != NULL)
216 tty_unlock(pca.tty);
217 va_end(ap);
218 if (sess != NULL)
219 sess_release(sess);
220 msgbuftrigger = 1;
221 sx_sunlock(&proctree_lock);
222 }
223
224 /*
225 * Ttyprintf displays a message on a tty; it should be used only by
226 * the tty driver, or anything that knows the underlying tty will not
227 * be revoke(2)'d away. Other callers should use tprintf.
228 */
229 int
230 ttyprintf(struct tty *tp, const char *fmt, ...)
231 {
232 va_list ap;
233 struct putchar_arg pca;
234 int retval;
235
236 va_start(ap, fmt);
237 pca.tty = tp;
238 pca.flags = TOTTY;
239 pca.p_bufr = NULL;
240 retval = kvprintf(fmt, putchar, &pca, 10, ap);
241 va_end(ap);
242 return (retval);
243 }
244
245 /*
246 * Log writes to the log buffer, and guarantees not to sleep (so can be
247 * called by interrupt routines). If there is no process reading the
248 * log yet, it writes to the console also.
249 */
250 void
251 log(int level, const char *fmt, ...)
252 {
253 va_list ap;
254 struct putchar_arg pca;
255 #ifdef PRINTF_BUFR_SIZE
256 char bufr[PRINTF_BUFR_SIZE];
257 #endif
258
259 pca.tty = NULL;
260 pca.pri = level;
261 pca.flags = log_open ? TOLOG : TOCONS;
262 #ifdef PRINTF_BUFR_SIZE
263 pca.p_bufr = bufr;
264 pca.p_next = pca.p_bufr;
265 pca.n_bufr = sizeof(bufr);
266 pca.remain = sizeof(bufr);
267 *pca.p_next = '\0';
268 #else
269 pca.p_bufr = NULL;
270 #endif
271
272 va_start(ap, fmt);
273 kvprintf(fmt, putchar, &pca, 10, ap);
274 va_end(ap);
275
276 #ifdef PRINTF_BUFR_SIZE
277 /* Write any buffered console/log output: */
278 if (*pca.p_bufr != '\0') {
279 if (pca.flags & TOLOG)
280 msglogstr(pca.p_bufr, level, /*filter_cr*/1);
281
282 if (pca.flags & TOCONS)
283 cnputs(pca.p_bufr);
284 }
285 #endif
286 msgbuftrigger = 1;
287 }
288
289 #define CONSCHUNK 128
290
291 void
292 log_console(struct uio *uio)
293 {
294 int c, error, nl;
295 char *consbuffer;
296 int pri;
297
298 if (!log_console_output)
299 return;
300
301 pri = LOG_INFO | LOG_CONSOLE;
302 uio = cloneuio(uio);
303 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
304
305 nl = 0;
306 while (uio->uio_resid > 0) {
307 c = imin(uio->uio_resid, CONSCHUNK - 1);
308 error = uiomove(consbuffer, c, uio);
309 if (error != 0)
310 break;
311 /* Make sure we're NUL-terminated */
312 consbuffer[c] = '\0';
313 if (consbuffer[c - 1] == '\n')
314 nl = 1;
315 else
316 nl = 0;
317 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
318 }
319 /*
320 * The previous behavior in log_console() is preserved when
321 * log_console_add_linefeed is non-zero. For that behavior, if an
322 * individual console write came in that was not terminated with a
323 * line feed, it would add a line feed.
324 *
325 * This results in different data in the message buffer than
326 * appears on the system console (which doesn't add extra line feed
327 * characters).
328 *
329 * A number of programs and rc scripts write a line feed, or a period
330 * and a line feed when they have completed their operation. On
331 * the console, this looks seamless, but when displayed with
332 * 'dmesg -a', you wind up with output that looks like this:
333 *
334 * Updating motd:
335 * .
336 *
337 * On the console, it looks like this:
338 * Updating motd:.
339 *
340 * We could add logic to detect that situation, or just not insert
341 * the extra newlines. Set the kern.log_console_add_linefeed
342 * sysctl/tunable variable to get the old behavior.
343 */
344 if (!nl && log_console_add_linefeed) {
345 consbuffer[0] = '\n';
346 consbuffer[1] = '\0';
347 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
348 }
349 msgbuftrigger = 1;
350 free(uio, M_IOV);
351 free(consbuffer, M_TEMP);
352 return;
353 }
354
355 int
356 printf(const char *fmt, ...)
357 {
358 va_list ap;
359 int retval;
360
361 va_start(ap, fmt);
362 retval = vprintf(fmt, ap);
363 va_end(ap);
364
365 return (retval);
366 }
367
368 int
369 vprintf(const char *fmt, va_list ap)
370 {
371 struct putchar_arg pca;
372 int retval;
373 #ifdef PRINTF_BUFR_SIZE
374 char bufr[PRINTF_BUFR_SIZE];
375 #endif
376
377 pca.tty = NULL;
378 pca.flags = TOCONS | TOLOG;
379 pca.pri = -1;
380 #ifdef PRINTF_BUFR_SIZE
381 pca.p_bufr = bufr;
382 pca.p_next = pca.p_bufr;
383 pca.n_bufr = sizeof(bufr);
384 pca.remain = sizeof(bufr);
385 *pca.p_next = '\0';
386 #else
387 /* Don't buffer console output. */
388 pca.p_bufr = NULL;
389 #endif
390
391 retval = kvprintf(fmt, putchar, &pca, 10, ap);
392
393 #ifdef PRINTF_BUFR_SIZE
394 /* Write any buffered console/log output: */
395 if (*pca.p_bufr != '\0') {
396 cnputs(pca.p_bufr);
397 msglogstr(pca.p_bufr, pca.pri, /*filter_cr*/ 1);
398 }
399 #endif
400
401 if (!panicstr)
402 msgbuftrigger = 1;
403
404 return (retval);
405 }
406
407 static void
408 putbuf(int c, struct putchar_arg *ap)
409 {
410 /* Check if no console output buffer was provided. */
411 if (ap->p_bufr == NULL) {
412 /* Output direct to the console. */
413 if (ap->flags & TOCONS)
414 cnputc(c);
415
416 if (ap->flags & TOLOG)
417 msglogchar(c, ap->pri);
418 } else {
419 /* Buffer the character: */
420 *ap->p_next++ = c;
421 ap->remain--;
422
423 /* Always leave the buffer zero terminated. */
424 *ap->p_next = '\0';
425
426 /* Check if the buffer needs to be flushed. */
427 if (ap->remain == 2 || c == '\n') {
428
429 if (ap->flags & TOLOG)
430 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
431
432 if (ap->flags & TOCONS) {
433 if ((panicstr == NULL) && (constty != NULL))
434 msgbuf_addstr(&consmsgbuf, -1,
435 ap->p_bufr, /*filter_cr*/ 0);
436
437 if ((constty == NULL) ||(always_console_output))
438 cnputs(ap->p_bufr);
439 }
440
441 ap->p_next = ap->p_bufr;
442 ap->remain = ap->n_bufr;
443 *ap->p_next = '\0';
444 }
445
446 /*
447 * Since we fill the buffer up one character at a time,
448 * this should not happen. We should always catch it when
449 * ap->remain == 2 (if not sooner due to a newline), flush
450 * the buffer and move on. One way this could happen is
451 * if someone sets PRINTF_BUFR_SIZE to 1 or something
452 * similarly silly.
453 */
454 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
455 ap->remain));
456 }
457 }
458
459 /*
460 * Print a character on console or users terminal. If destination is
461 * the console then the last bunch of characters are saved in msgbuf for
462 * inspection later.
463 */
464 static void
465 putchar(int c, void *arg)
466 {
467 struct putchar_arg *ap = (struct putchar_arg*) arg;
468 struct tty *tp = ap->tty;
469 int flags = ap->flags;
470 int putbuf_done = 0;
471
472 /* Don't use the tty code after a panic or while in ddb. */
473 if (kdb_active) {
474 if (c != '\0')
475 cnputc(c);
476 } else {
477 if ((panicstr == NULL) && (flags & TOTTY) && (tp != NULL))
478 tty_putchar(tp, c);
479
480 if (flags & TOCONS) {
481 putbuf(c, ap);
482 putbuf_done = 1;
483 }
484 }
485 if ((flags & TOLOG) && (putbuf_done == 0)) {
486 if (c != '\0')
487 putbuf(c, ap);
488 }
489 }
490
491 /*
492 * Scaled down version of sprintf(3).
493 */
494 int
495 sprintf(char *buf, const char *cfmt, ...)
496 {
497 int retval;
498 va_list ap;
499
500 va_start(ap, cfmt);
501 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
502 buf[retval] = '\0';
503 va_end(ap);
504 return (retval);
505 }
506
507 /*
508 * Scaled down version of vsprintf(3).
509 */
510 int
511 vsprintf(char *buf, const char *cfmt, va_list ap)
512 {
513 int retval;
514
515 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
516 buf[retval] = '\0';
517 return (retval);
518 }
519
520 /*
521 * Scaled down version of snprintf(3).
522 */
523 int
524 snprintf(char *str, size_t size, const char *format, ...)
525 {
526 int retval;
527 va_list ap;
528
529 va_start(ap, format);
530 retval = vsnprintf(str, size, format, ap);
531 va_end(ap);
532 return(retval);
533 }
534
535 /*
536 * Scaled down version of vsnprintf(3).
537 */
538 int
539 vsnprintf(char *str, size_t size, const char *format, va_list ap)
540 {
541 struct snprintf_arg info;
542 int retval;
543
544 info.str = str;
545 info.remain = size;
546 retval = kvprintf(format, snprintf_func, &info, 10, ap);
547 if (info.remain >= 1)
548 *info.str++ = '\0';
549 return (retval);
550 }
551
552 /*
553 * Kernel version which takes radix argument vsnprintf(3).
554 */
555 int
556 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
557 {
558 struct snprintf_arg info;
559 int retval;
560
561 info.str = str;
562 info.remain = size;
563 retval = kvprintf(format, snprintf_func, &info, radix, ap);
564 if (info.remain >= 1)
565 *info.str++ = '\0';
566 return (retval);
567 }
568
569 static void
570 snprintf_func(int ch, void *arg)
571 {
572 struct snprintf_arg *const info = arg;
573
574 if (info->remain >= 2) {
575 *info->str++ = ch;
576 info->remain--;
577 }
578 }
579
580 /*
581 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
582 * order; return an optional length and a pointer to the last character
583 * written in the buffer (i.e., the first character of the string).
584 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
585 */
586 static char *
587 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
588 {
589 char *p, c;
590
591 p = nbuf;
592 *p = '\0';
593 do {
594 c = hex2ascii(num % base);
595 *++p = upper ? toupper(c) : c;
596 } while (num /= base);
597 if (lenp)
598 *lenp = p - nbuf;
599 return (p);
600 }
601
602 /*
603 * Scaled down version of printf(3).
604 *
605 * Two additional formats:
606 *
607 * The format %b is supported to decode error registers.
608 * Its usage is:
609 *
610 * printf("reg=%b\n", regval, "<base><arg>*");
611 *
612 * where <base> is the output base expressed as a control character, e.g.
613 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
614 * the first of which gives the bit number to be inspected (origin 1), and
615 * the next characters (up to a control character, i.e. a character <= 32),
616 * give the name of the register. Thus:
617 *
618 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
619 *
620 * would produce output:
621 *
622 * reg=3<BITTWO,BITONE>
623 *
624 * XXX: %D -- Hexdump, takes pointer and separator string:
625 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
626 * ("%*D", len, ptr, " " -> XX XX XX XX ...
627 */
628 int
629 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
630 {
631 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
632 char nbuf[MAXNBUF];
633 char *d;
634 const char *p, *percent, *q;
635 u_char *up;
636 int ch, n;
637 uintmax_t num;
638 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
639 int cflag, hflag, jflag, tflag, zflag;
640 int dwidth, upper;
641 char padc;
642 int stop = 0, retval = 0;
643
644 num = 0;
645 if (!func)
646 d = (char *) arg;
647 else
648 d = NULL;
649
650 if (fmt == NULL)
651 fmt = "(fmt null)\n";
652
653 if (radix < 2 || radix > 36)
654 radix = 10;
655
656 for (;;) {
657 padc = ' ';
658 width = 0;
659 while ((ch = (u_char)*fmt++) != '%' || stop) {
660 if (ch == '\0')
661 return (retval);
662 PCHAR(ch);
663 }
664 percent = fmt - 1;
665 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
666 sign = 0; dot = 0; dwidth = 0; upper = 0;
667 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
668 reswitch: switch (ch = (u_char)*fmt++) {
669 case '.':
670 dot = 1;
671 goto reswitch;
672 case '#':
673 sharpflag = 1;
674 goto reswitch;
675 case '+':
676 sign = 1;
677 goto reswitch;
678 case '-':
679 ladjust = 1;
680 goto reswitch;
681 case '%':
682 PCHAR(ch);
683 break;
684 case '*':
685 if (!dot) {
686 width = va_arg(ap, int);
687 if (width < 0) {
688 ladjust = !ladjust;
689 width = -width;
690 }
691 } else {
692 dwidth = va_arg(ap, int);
693 }
694 goto reswitch;
695 case '':
696 if (!dot) {
697 padc = '';
698 goto reswitch;
699 }
700 case '1': case '2': case '3': case '4':
701 case '5': case '6': case '7': case '8': case '9':
702 for (n = 0;; ++fmt) {
703 n = n * 10 + ch - '';
704 ch = *fmt;
705 if (ch < '' || ch > '9')
706 break;
707 }
708 if (dot)
709 dwidth = n;
710 else
711 width = n;
712 goto reswitch;
713 case 'b':
714 num = (u_int)va_arg(ap, int);
715 p = va_arg(ap, char *);
716 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
717 PCHAR(*q--);
718
719 if (num == 0)
720 break;
721
722 for (tmp = 0; *p;) {
723 n = *p++;
724 if (num & (1 << (n - 1))) {
725 PCHAR(tmp ? ',' : '<');
726 for (; (n = *p) > ' '; ++p)
727 PCHAR(n);
728 tmp = 1;
729 } else
730 for (; *p > ' '; ++p)
731 continue;
732 }
733 if (tmp)
734 PCHAR('>');
735 break;
736 case 'c':
737 PCHAR(va_arg(ap, int));
738 break;
739 case 'D':
740 up = va_arg(ap, u_char *);
741 p = va_arg(ap, char *);
742 if (!width)
743 width = 16;
744 while(width--) {
745 PCHAR(hex2ascii(*up >> 4));
746 PCHAR(hex2ascii(*up & 0x0f));
747 up++;
748 if (width)
749 for (q=p;*q;q++)
750 PCHAR(*q);
751 }
752 break;
753 case 'd':
754 case 'i':
755 base = 10;
756 sign = 1;
757 goto handle_sign;
758 case 'h':
759 if (hflag) {
760 hflag = 0;
761 cflag = 1;
762 } else
763 hflag = 1;
764 goto reswitch;
765 case 'j':
766 jflag = 1;
767 goto reswitch;
768 case 'l':
769 if (lflag) {
770 lflag = 0;
771 qflag = 1;
772 } else
773 lflag = 1;
774 goto reswitch;
775 case 'n':
776 if (jflag)
777 *(va_arg(ap, intmax_t *)) = retval;
778 else if (qflag)
779 *(va_arg(ap, quad_t *)) = retval;
780 else if (lflag)
781 *(va_arg(ap, long *)) = retval;
782 else if (zflag)
783 *(va_arg(ap, size_t *)) = retval;
784 else if (hflag)
785 *(va_arg(ap, short *)) = retval;
786 else if (cflag)
787 *(va_arg(ap, char *)) = retval;
788 else
789 *(va_arg(ap, int *)) = retval;
790 break;
791 case 'o':
792 base = 8;
793 goto handle_nosign;
794 case 'p':
795 base = 16;
796 sharpflag = (width == 0);
797 sign = 0;
798 num = (uintptr_t)va_arg(ap, void *);
799 goto number;
800 case 'q':
801 qflag = 1;
802 goto reswitch;
803 case 'r':
804 base = radix;
805 if (sign)
806 goto handle_sign;
807 goto handle_nosign;
808 case 's':
809 p = va_arg(ap, char *);
810 if (p == NULL)
811 p = "(null)";
812 if (!dot)
813 n = strlen (p);
814 else
815 for (n = 0; n < dwidth && p[n]; n++)
816 continue;
817
818 width -= n;
819
820 if (!ladjust && width > 0)
821 while (width--)
822 PCHAR(padc);
823 while (n--)
824 PCHAR(*p++);
825 if (ladjust && width > 0)
826 while (width--)
827 PCHAR(padc);
828 break;
829 case 't':
830 tflag = 1;
831 goto reswitch;
832 case 'u':
833 base = 10;
834 goto handle_nosign;
835 case 'X':
836 upper = 1;
837 case 'x':
838 base = 16;
839 goto handle_nosign;
840 case 'y':
841 base = 16;
842 sign = 1;
843 goto handle_sign;
844 case 'z':
845 zflag = 1;
846 goto reswitch;
847 handle_nosign:
848 sign = 0;
849 if (jflag)
850 num = va_arg(ap, uintmax_t);
851 else if (qflag)
852 num = va_arg(ap, u_quad_t);
853 else if (tflag)
854 num = va_arg(ap, ptrdiff_t);
855 else if (lflag)
856 num = va_arg(ap, u_long);
857 else if (zflag)
858 num = va_arg(ap, size_t);
859 else if (hflag)
860 num = (u_short)va_arg(ap, int);
861 else if (cflag)
862 num = (u_char)va_arg(ap, int);
863 else
864 num = va_arg(ap, u_int);
865 goto number;
866 handle_sign:
867 if (jflag)
868 num = va_arg(ap, intmax_t);
869 else if (qflag)
870 num = va_arg(ap, quad_t);
871 else if (tflag)
872 num = va_arg(ap, ptrdiff_t);
873 else if (lflag)
874 num = va_arg(ap, long);
875 else if (zflag)
876 num = va_arg(ap, ssize_t);
877 else if (hflag)
878 num = (short)va_arg(ap, int);
879 else if (cflag)
880 num = (char)va_arg(ap, int);
881 else
882 num = va_arg(ap, int);
883 number:
884 if (sign && (intmax_t)num < 0) {
885 neg = 1;
886 num = -(intmax_t)num;
887 }
888 p = ksprintn(nbuf, num, base, &n, upper);
889 tmp = 0;
890 if (sharpflag && num != 0) {
891 if (base == 8)
892 tmp++;
893 else if (base == 16)
894 tmp += 2;
895 }
896 if (neg)
897 tmp++;
898
899 if (!ladjust && padc == '')
900 dwidth = width - tmp;
901 width -= tmp + imax(dwidth, n);
902 dwidth -= n;
903 if (!ladjust)
904 while (width-- > 0)
905 PCHAR(' ');
906 if (neg)
907 PCHAR('-');
908 if (sharpflag && num != 0) {
909 if (base == 8) {
910 PCHAR('');
911 } else if (base == 16) {
912 PCHAR('');
913 PCHAR('x');
914 }
915 }
916 while (dwidth-- > 0)
917 PCHAR('');
918
919 while (*p)
920 PCHAR(*p--);
921
922 if (ladjust)
923 while (width-- > 0)
924 PCHAR(' ');
925
926 break;
927 default:
928 while (percent < fmt)
929 PCHAR(*percent++);
930 /*
931 * Since we ignore an formatting argument it is no
932 * longer safe to obey the remaining formatting
933 * arguments as the arguments will no longer match
934 * the format specs.
935 */
936 stop = 1;
937 break;
938 }
939 }
940 #undef PCHAR
941 }
942
943 /*
944 * Put character in log buffer with a particular priority.
945 */
946 static void
947 msglogchar(int c, int pri)
948 {
949 static int lastpri = -1;
950 static int dangling;
951 char nbuf[MAXNBUF];
952 char *p;
953
954 if (!msgbufmapped)
955 return;
956 if (c == '\0' || c == '\r')
957 return;
958 if (pri != -1 && pri != lastpri) {
959 if (dangling) {
960 msgbuf_addchar(msgbufp, '\n');
961 dangling = 0;
962 }
963 msgbuf_addchar(msgbufp, '<');
964 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
965 msgbuf_addchar(msgbufp, *p--);
966 msgbuf_addchar(msgbufp, '>');
967 lastpri = pri;
968 }
969 msgbuf_addchar(msgbufp, c);
970 if (c == '\n') {
971 dangling = 0;
972 lastpri = -1;
973 } else {
974 dangling = 1;
975 }
976 }
977
978 static void
979 msglogstr(char *str, int pri, int filter_cr)
980 {
981 if (!msgbufmapped)
982 return;
983
984 msgbuf_addstr(msgbufp, pri, str, filter_cr);
985 }
986
987 void
988 msgbufinit(void *ptr, int size)
989 {
990 char *cp;
991 static struct msgbuf *oldp = NULL;
992
993 size -= sizeof(*msgbufp);
994 cp = (char *)ptr;
995 msgbufp = (struct msgbuf *)(cp + size);
996 msgbuf_reinit(msgbufp, cp, size);
997 if (msgbufmapped && oldp != msgbufp)
998 msgbuf_copy(oldp, msgbufp);
999 msgbufmapped = 1;
1000 oldp = msgbufp;
1001 }
1002
1003 static int unprivileged_read_msgbuf = 1;
1004 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
1005 CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
1006 "Unprivileged processes may read the kernel message buffer");
1007
1008 /* Sysctls for accessing/clearing the msgbuf */
1009 static int
1010 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
1011 {
1012 char buf[128];
1013 u_int seq;
1014 int error, len;
1015
1016 if (!unprivileged_read_msgbuf) {
1017 error = priv_check(req->td, PRIV_MSGBUF);
1018 if (error)
1019 return (error);
1020 }
1021
1022 /* Read the whole buffer, one chunk at a time. */
1023 mtx_lock(&msgbuf_lock);
1024 msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
1025 for (;;) {
1026 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
1027 mtx_unlock(&msgbuf_lock);
1028 if (len == 0)
1029 return (0);
1030
1031 error = sysctl_handle_opaque(oidp, buf, len, req);
1032 if (error)
1033 return (error);
1034
1035 mtx_lock(&msgbuf_lock);
1036 }
1037 }
1038
1039 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
1040 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
1041 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
1042
1043 static int msgbuf_clearflag;
1044
1045 static int
1046 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
1047 {
1048 int error;
1049 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
1050 if (!error && req->newptr) {
1051 mtx_lock(&msgbuf_lock);
1052 msgbuf_clear(msgbufp);
1053 mtx_unlock(&msgbuf_lock);
1054 msgbuf_clearflag = 0;
1055 }
1056 return (error);
1057 }
1058
1059 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
1060 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
1061 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
1062 "Clear kernel message buffer");
1063
1064 #ifdef DDB
1065
1066 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
1067 {
1068 int i, j;
1069
1070 if (!msgbufmapped) {
1071 db_printf("msgbuf not mapped yet\n");
1072 return;
1073 }
1074 db_printf("msgbufp = %p\n", msgbufp);
1075 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
1076 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
1077 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
1078 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
1079 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
1080 db_printf("%c", msgbufp->msg_ptr[j]);
1081 }
1082 db_printf("\n");
1083 }
1084
1085 #endif /* DDB */
1086
1087 void
1088 hexdump(const void *ptr, int length, const char *hdr, int flags)
1089 {
1090 int i, j, k;
1091 int cols;
1092 const unsigned char *cp;
1093 char delim;
1094
1095 if ((flags & HD_DELIM_MASK) != 0)
1096 delim = (flags & HD_DELIM_MASK) >> 8;
1097 else
1098 delim = ' ';
1099
1100 if ((flags & HD_COLUMN_MASK) != 0)
1101 cols = flags & HD_COLUMN_MASK;
1102 else
1103 cols = 16;
1104
1105 cp = ptr;
1106 for (i = 0; i < length; i+= cols) {
1107 if (hdr != NULL)
1108 printf("%s", hdr);
1109
1110 if ((flags & HD_OMIT_COUNT) == 0)
1111 printf("%04x ", i);
1112
1113 if ((flags & HD_OMIT_HEX) == 0) {
1114 for (j = 0; j < cols; j++) {
1115 k = i + j;
1116 if (k < length)
1117 printf("%c%02x", delim, cp[k]);
1118 else
1119 printf(" ");
1120 }
1121 }
1122
1123 if ((flags & HD_OMIT_CHARS) == 0) {
1124 printf(" |");
1125 for (j = 0; j < cols; j++) {
1126 k = i + j;
1127 if (k >= length)
1128 printf(" ");
1129 else if (cp[k] >= ' ' && cp[k] <= '~')
1130 printf("%c", cp[k]);
1131 else
1132 printf(".");
1133 }
1134 printf("|");
1135 }
1136 printf("\n");
1137 }
1138 }
1139
Cache object: 0bccc67234036bb0b74f6159bf0a6811
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