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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. 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.
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
34 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
35 * $FreeBSD: src/sys/kern/subr_prf.c,v 1.61.2.5 2002/08/31 18:22:08 dwmalone Exp $
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/msgbuf.h>
44 #include <sys/malloc.h>
48 #include <sys/tprintf.h>
49 #include <sys/stdint.h>
50 #include <sys/syslog.h>
53 #include <sys/sysctl.h>
55 #include <sys/ctype.h>
56 #include <sys/eventhandler.h>
57 #include <sys/kthread.h>
58 #include <sys/cpu_topology.h>
60 #include <sys/thread2.h>
61 #include <sys/spinlock2.h>
68 * Note that stdarg.h and the ANSI style va_start macro is used for both
69 * ANSI and traditional C compilers. We use the __ machine version to stay
70 * within the kernel header file set.
72 #include <machine/stdarg.h>
78 #define TONOSPIN 0x10 /* avoid serialization */
80 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
81 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
96 struct tty
*constty
; /* pointer to console "window" tty */
98 static void msglogchar(int c
, int pri
);
99 static void msgaddchar(int c
, void *dummy
);
100 static void kputchar (int ch
, void *arg
);
101 static char *ksprintn (char *nbuf
, uintmax_t num
, int base
, int *lenp
,
103 static void snprintf_func (int ch
, void *arg
);
105 static int consintr
= 1; /* Ok to handle console interrupts? */
106 static int msgbufmapped
; /* Set when safe to use msgbuf */
107 static struct spinlock cons_spin
= SPINLOCK_INITIALIZER(cons_spin
, "cons_spin");
108 static thread_t constty_td
= NULL
;
112 static int log_console_output
= 1;
113 TUNABLE_INT("kern.log_console_output", &log_console_output
);
114 SYSCTL_INT(_kern
, OID_AUTO
, log_console_output
, CTLFLAG_RW
,
115 &log_console_output
, 0, "");
116 static int kprintf_logging
= TOLOG
| TOCONS
;
117 SYSCTL_INT(_kern
, OID_AUTO
, kprintf_logging
, CTLFLAG_RW
,
118 &kprintf_logging
, 0, "");
120 static int unprivileged_read_msgbuf
= 1;
121 SYSCTL_INT(_security
, OID_AUTO
, unprivileged_read_msgbuf
, CTLFLAG_RW
,
122 &unprivileged_read_msgbuf
, 0,
123 "Unprivileged processes may read the kernel message buffer");
126 * Warn that a system table is full.
129 tablefull(const char *tab
)
132 log(LOG_ERR
, "%s: table is full\n", tab
);
136 * Uprintf prints to the controlling terminal for the current process.
139 uprintf(const char *fmt
, ...)
141 struct proc
*p
= curproc
;
143 struct putchar_arg pca
;
146 if (p
&& (p
->p_flags
& P_CONTROLT
) && p
->p_session
->s_ttyvp
) {
148 pca
.tty
= p
->p_session
->s_ttyp
;
151 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
158 tprintf_open(struct proc
*p
)
160 if ((p
->p_flags
& P_CONTROLT
) && p
->p_session
->s_ttyvp
) {
161 sess_hold(p
->p_session
);
162 return ((tpr_t
) p
->p_session
);
168 tprintf_close(tpr_t sess
)
171 sess_rele((struct session
*) sess
);
175 * tprintf prints on the controlling terminal associated
176 * with the given session.
179 tprintf(tpr_t tpr
, const char *fmt
, ...)
181 struct session
*sess
= (struct session
*)tpr
;
182 struct tty
*tp
= NULL
;
185 struct putchar_arg pca
;
188 if (sess
&& sess
->s_ttyvp
&& ttycheckoutq(sess
->s_ttyp
, 0)) {
196 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
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.
208 ttyprintf(struct tty
*tp
, const char *fmt
, ...)
211 struct putchar_arg pca
;
217 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
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.
228 log(int level
, const char *fmt
, ...)
232 struct putchar_arg pca
;
236 if ((kprintf_logging
& TOCONS
) == 0 || log_open
)
242 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
249 #define CONSCHUNK 128
252 log_console(struct uio
*uio
)
254 int c
, i
, error
, iovlen
, nl
;
256 struct iovec
*miov
= NULL
;
260 if (!log_console_output
)
263 pri
= LOG_INFO
| LOG_CONSOLE
;
265 iovlen
= uio
->uio_iovcnt
* sizeof (struct iovec
);
266 miov
= kmalloc(iovlen
, M_TEMP
, M_WAITOK
);
267 consbuffer
= kmalloc(CONSCHUNK
, M_TEMP
, M_WAITOK
);
268 bcopy((caddr_t
)muio
.uio_iov
, (caddr_t
)miov
, iovlen
);
273 while (uio
->uio_resid
> 0) {
274 c
= (int)szmin(uio
->uio_resid
, CONSCHUNK
);
275 error
= uiomove(consbuffer
, (size_t)c
, uio
);
278 for (i
= 0; i
< c
; i
++) {
279 msglogchar(consbuffer
[i
], pri
);
280 if (consbuffer
[i
] == '\n')
287 msglogchar('\n', pri
);
290 kfree(consbuffer
, M_TEMP
);
295 * Output to the console.
298 kprintf(const char *fmt
, ...)
302 struct putchar_arg pca
;
305 savintr
= consintr
; /* disable interrupts */
309 pca
.flags
= kprintf_logging
& ~TOTTY
;
311 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
315 consintr
= savintr
; /* reenable interrupts */
320 kvprintf(const char *fmt
, __va_list ap
)
323 struct putchar_arg pca
;
326 savintr
= consintr
; /* disable interrupts */
329 pca
.flags
= kprintf_logging
& ~TOTTY
;
331 retval
= kvcprintf(fmt
, kputchar
, &pca
, ap
);
334 consintr
= savintr
; /* reenable interrupts */
339 * Limited rate kprintf. The passed rate structure must be initialized
340 * with the desired reporting frequency. A frequency of 0 will result in
343 * count may be initialized to a negative number to allow an initial
347 krateprintf(struct krate
*rate
, const char *fmt
, ...)
351 if (rate
->ticks
!= (int)time_uptime
) {
352 rate
->ticks
= (int)time_uptime
;
356 if (rate
->count
< rate
->freq
) {
365 * Print a character to the dmesg log, the console, and/or the user's
368 * NOTE: TOTTY does not require nonblocking operation, but TOCONS
369 * and TOLOG do. When we have a constty we still output to
370 * the real console but we have a monitoring thread which
371 * we wakeup which tracks the log.
374 kputchar(int c
, void *arg
)
376 struct putchar_arg
*ap
= (struct putchar_arg
*) arg
;
377 int flags
= ap
->flags
;
378 struct tty
*tp
= ap
->tty
;
382 if ((flags
& TOCONS
) && tp
== NULL
&& constty
)
383 flags
|= TOLOG
| TOWAKEUP
;
384 if ((flags
& TOTTY
) && tputchar(c
, tp
) < 0)
387 msglogchar(c
, ap
->pri
);
388 if ((flags
& TOCONS
) && c
)
390 if (flags
& TOWAKEUP
)
395 * Scaled down version of sprintf(3).
398 ksprintf(char *buf
, const char *cfmt
, ...)
403 __va_start(ap
, cfmt
);
404 retval
= kvcprintf(cfmt
, NULL
, buf
, ap
);
411 * Scaled down version of vsprintf(3).
414 kvsprintf(char *buf
, const char *cfmt
, __va_list ap
)
418 retval
= kvcprintf(cfmt
, NULL
, buf
, ap
);
424 * Scaled down version of snprintf(3).
427 ksnprintf(char *str
, size_t size
, const char *format
, ...)
432 __va_start(ap
, format
);
433 retval
= kvsnprintf(str
, size
, format
, ap
);
439 * Scaled down version of vsnprintf(3).
442 kvsnprintf(char *str
, size_t size
, const char *format
, __va_list ap
)
444 struct snprintf_arg info
;
449 retval
= kvcprintf(format
, snprintf_func
, &info
, ap
);
450 if (info
.remain
>= 1)
456 kvasnprintf(char **strp
, size_t size
, const char *format
, __va_list ap
)
458 struct snprintf_arg info
;
461 *strp
= kmalloc(size
, M_TEMP
, M_WAITOK
);
464 retval
= kvcprintf(format
, snprintf_func
, &info
, ap
);
465 if (info
.remain
>= 1)
471 kvasfree(char **strp
)
474 kfree(*strp
, M_TEMP
);
480 snprintf_func(int ch
, void *arg
)
482 struct snprintf_arg
*const info
= arg
;
484 if (info
->remain
>= 2) {
491 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
492 * order; return an optional length and a pointer to the last character
493 * written in the buffer (i.e., the first character of the string).
494 * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
497 ksprintn(char *nbuf
, uintmax_t num
, int base
, int *lenp
, int upper
)
504 c
= hex2ascii(num
% base
);
505 *++p
= upper
? toupper(c
) : c
;
506 } while (num
/= base
);
513 * Scaled down version of printf(3).
515 * Two additional formats:
517 * The format %b is supported to decode error registers.
520 * kprintf("reg=%b\n", regval, "<base><arg>*");
522 * where <base> is the output base expressed as a control character, e.g.
523 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
524 * the first of which gives the bit number to be inspected (origin 1), and
525 * the next characters (up to a control character, i.e. a character <= 32),
526 * give the name of the register. Thus:
528 * kvcprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
530 * would produce output:
532 * reg=3<BITTWO,BITONE>
535 #define PCHAR(c) {int cc=(c); if(func) (*func)(cc,arg); else *d++=cc; retval++;}
538 kvcprintf(char const *fmt
, void (*func
)(int, void*), void *arg
, __va_list ap
)
542 const char *p
, *percent
, *q
;
545 int base
, tmp
, width
, ladjust
, sharpflag
, spaceflag
, neg
, sign
, dot
;
546 int cflag
, hflag
, jflag
, lflag
, qflag
, tflag
, zflag
;
549 int retval
= 0, stop
= 0;
553 * Make a supreme effort to avoid reentrant panics or deadlocks.
555 * NOTE! Do nothing that would access mycpu/gd/fs unless the
556 * function is the normal kputchar(), which allows us to
557 * use this function for very early debugging with a special
560 if (func
== kputchar
) {
561 if (mycpu
->gd_flags
& GDF_KPRINTF
)
563 atomic_set_long(&mycpu
->gd_flags
, GDF_KPRINTF
);
573 fmt
= "(fmt null)\n";
575 usespin
= (func
== kputchar
&&
576 (kprintf_logging
& TONOSPIN
) == 0 &&
577 panic_cpu_gd
!= mycpu
&&
578 (((struct putchar_arg
*)arg
)->flags
& TOTTY
) == 0);
581 spin_lock(&cons_spin
);
587 while ((ch
= (u_char
)*fmt
++) != '%' || stop
) {
593 dot
= dwidth
= ladjust
= neg
= sharpflag
= sign
= upper
= 0;
595 cflag
= hflag
= jflag
= lflag
= qflag
= tflag
= zflag
= 0;
598 switch (ch
= (u_char
)*fmt
++) {
619 width
= __va_arg(ap
, int);
625 dwidth
= __va_arg(ap
, int);
633 case '1': case '2': case '3': case '4':
634 case '5': case '6': case '7': case '8': case '9':
635 for (n
= 0;; ++fmt
) {
636 n
= n
* 10 + ch
- '0';
638 if (ch
< '0' || ch
> '9')
647 num
= (u_int
)__va_arg(ap
, int);
648 p
= __va_arg(ap
, char *);
649 for (q
= ksprintn(nbuf
, num
, *p
++, NULL
, 0); *q
;)
657 if (num
& (1 << (n
- 1))) {
658 PCHAR(tmp
? ',' : '<');
659 for (; (n
= *p
) > ' '; ++p
)
663 for (; *p
> ' '; ++p
)
670 PCHAR(__va_arg(ap
, int));
696 *(__va_arg(ap
, char *)) = retval
;
698 *(__va_arg(ap
, short *)) = retval
;
700 *(__va_arg(ap
, intmax_t *)) = retval
;
702 *(__va_arg(ap
, long *)) = retval
;
704 *(__va_arg(ap
, quad_t
*)) = retval
;
706 *(__va_arg(ap
, int *)) = retval
;
713 sharpflag
= (width
== 0);
715 num
= (uintptr_t)__va_arg(ap
, void *);
721 p
= __va_arg(ap
, char *);
727 for (n
= 0; n
< dwidth
&& p
[n
]; n
++)
732 if (!ladjust
&& width
> 0)
737 if (ladjust
&& width
> 0)
759 num
= (u_char
)__va_arg(ap
, int);
761 num
= (u_short
)__va_arg(ap
, int);
763 num
= __va_arg(ap
, uintmax_t);
765 num
= __va_arg(ap
, u_long
);
767 num
= __va_arg(ap
, u_quad_t
);
769 num
= __va_arg(ap
, ptrdiff_t);
771 num
= __va_arg(ap
, size_t);
773 num
= __va_arg(ap
, u_int
);
777 num
= (char)__va_arg(ap
, int);
779 num
= (short)__va_arg(ap
, int);
781 num
= __va_arg(ap
, intmax_t);
783 num
= __va_arg(ap
, long);
785 num
= __va_arg(ap
, quad_t
);
787 num
= __va_arg(ap
, ptrdiff_t);
789 num
= __va_arg(ap
, ssize_t
);
791 num
= __va_arg(ap
, int);
793 if (sign
&& (intmax_t)num
< 0) {
795 num
= -(intmax_t)num
;
797 p
= ksprintn(nbuf
, num
, base
, &n
, upper
);
799 if (sharpflag
&& num
!= 0) {
805 if (neg
|| (sign
&& spaceflag
))
808 if (!ladjust
&& padc
== '0')
809 dwidth
= width
- tmp
;
810 width
-= tmp
+ imax(dwidth
, n
);
817 } else if (sign
&& spaceflag
) {
820 if (sharpflag
&& num
!= 0) {
823 } else if (base
== 16) {
840 while (percent
< fmt
)
843 * Since we ignore an formatting argument it is no
844 * longer safe to obey the remaining formatting
845 * arguments as the arguments will no longer match
854 * Cleanup reentrancy issues.
856 if (func
== kputchar
)
857 atomic_clear_long(&mycpu
->gd_flags
, GDF_KPRINTF
);
859 spin_unlock(&cons_spin
);
868 * Called from the panic code to try to get the console working
869 * again in case we paniced inside a kprintf().
874 spin_init(&cons_spin
, "kvcre");
875 atomic_clear_long(&mycpu
->gd_flags
, GDF_KPRINTF
);
879 * Console support thread for constty intercepts. This is needed because
880 * console tty intercepts can block. Instead of having kputchar() attempt
881 * to directly write to the console intercept we just force it to log
882 * and wakeup this baby to track and dump the log to constty.
893 EVENTHANDLER_REGISTER(shutdown_pre_sync
, shutdown_kproc
,
894 constty_td
, SHUTDOWN_PRI_FIRST
);
895 constty_td
->td_flags
|= TDF_SYSTHREAD
;
898 rindex
= mbp
->msg_bufr
; /* persistent loop variable */
899 xindex
= mbp
->msg_bufx
- 1; /* anything different than bufx */
903 kproc_suspend_loop();
908 if (xindex
== mbp
->msg_bufx
||
911 tsleep(constty_td
, 0, "waiting", hz
*60);
918 * Get message buf FIFO indices. rindex is tracking.
920 xindex
= mbp
->msg_bufx
;
922 if ((tp
= constty
) == NULL
) {
928 * Check if the calculated bytes has rolled the whole
932 if (n
> mbp
->msg_size
- 1024) {
933 rindex
= xindex
- mbp
->msg_size
+ 2048;
938 * And dump it. If constty gets stuck will give up.
940 while (rindex
!= xindex
) {
941 u_int ri
= rindex
% mbp
->msg_size
;
942 if (tputchar((uint8_t)mbp
->msg_ptr
[ri
], tp
) < 0) {
947 if (tp
->t_outq
.c_cc
>= tp
->t_ohiwat
) {
948 tsleep(constty_daemon
, 0, "blocked", hz
/ 10);
949 if (tp
->t_outq
.c_cc
>= tp
->t_ohiwat
) {
959 static struct kproc_desc constty_kp
= {
964 SYSINIT(bufdaemon
, SI_SUB_KTHREAD_UPDATE
, SI_ORDER_ANY
,
965 kproc_start
, &constty_kp
);
968 * Put character in log buffer with a particular priority.
973 msglogchar(int c
, int pri
)
975 static int lastpri
= -1;
982 if (c
== '\0' || c
== '\r')
984 if (pri
!= -1 && pri
!= lastpri
) {
986 msgaddchar('\n', NULL
);
989 msgaddchar('<', NULL
);
990 for (p
= ksprintn(nbuf
, (uintmax_t)pri
, 10, NULL
, 0); *p
;)
991 msgaddchar(*p
--, NULL
);
992 msgaddchar('>', NULL
);
1005 * Put char in log buffer. Make sure nothing blows up beyond repair if
1006 * we have an MP race.
1011 msgaddchar(int c
, void *dummy
)
1022 lindex
= mbp
->msg_bufl
;
1023 rindex
= mbp
->msg_bufr
;
1024 xindex
= mbp
->msg_bufx
++; /* Allow SMP race */
1027 mbp
->msg_ptr
[xindex
% mbp
->msg_size
] = c
;
1028 n
= xindex
- lindex
;
1029 if (n
> mbp
->msg_size
- 1024) {
1030 lindex
= xindex
- mbp
->msg_size
+ 2048;
1032 mbp
->msg_bufl
= lindex
;
1034 n
= xindex
- rindex
;
1035 if (n
> mbp
->msg_size
- 1024) {
1036 rindex
= xindex
- mbp
->msg_size
+ 2048;
1038 mbp
->msg_bufr
= rindex
;
1043 msgbufcopy(struct msgbuf
*oldp
)
1049 rindex
= oldp
->msg_bufr
;
1050 xindex
= oldp
->msg_bufx
;
1053 n
= xindex
- rindex
;
1054 if (n
> oldp
->msg_size
- 1024)
1055 rindex
= xindex
- oldp
->msg_size
+ 2048;
1056 while (rindex
!= xindex
) {
1057 msglogchar(oldp
->msg_ptr
[rindex
% oldp
->msg_size
], -1);
1063 msgbufinit(void *ptr
, size_t size
)
1066 static struct msgbuf
*oldp
= NULL
;
1068 size
-= sizeof(*msgbufp
);
1070 msgbufp
= (struct msgbuf
*) (cp
+ size
);
1071 if (msgbufp
->msg_magic
!= MSG_MAGIC
|| msgbufp
->msg_size
!= size
) {
1073 bzero(msgbufp
, sizeof(*msgbufp
));
1074 msgbufp
->msg_magic
= MSG_MAGIC
;
1075 msgbufp
->msg_size
= (char *)msgbufp
- cp
;
1077 msgbufp
->msg_ptr
= cp
;
1078 if (msgbufmapped
&& oldp
!= msgbufp
)
1085 /* Sysctls for accessing/clearing the msgbuf */
1088 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS
)
1093 u_int rindex_modulo
;
1094 u_int xindex_modulo
;
1100 * Only wheel or root can access the message log.
1102 if (unprivileged_read_msgbuf
== 0) {
1103 KKASSERT(req
->td
->td_proc
);
1104 cred
= req
->td
->td_proc
->p_ucred
;
1106 if ((cred
->cr_prison
|| groupmember(0, cred
) == 0) &&
1107 priv_check(req
->td
, PRIV_ROOT
) != 0
1114 * Unwind the buffer, so that it's linear (possibly starting with
1115 * some initial nulls).
1117 * We don't push the entire buffer like we did before because
1118 * bufr (and bufl) now advance in chunks when the fifo is full,
1119 * rather than one character.
1122 rindex
= mbp
->msg_bufr
;
1123 xindex
= mbp
->msg_bufx
;
1124 n
= xindex
- rindex
;
1125 if (n
> mbp
->msg_size
- 1024) {
1126 rindex
= xindex
- mbp
->msg_size
+ 2048;
1127 n
= xindex
- rindex
;
1129 rindex_modulo
= rindex
% mbp
->msg_size
;
1130 xindex_modulo
= xindex
% mbp
->msg_size
;
1132 if (rindex_modulo
< xindex_modulo
) {
1134 * Can handle in one linear section.
1136 error
= sysctl_handle_opaque(oidp
,
1137 mbp
->msg_ptr
+ rindex_modulo
,
1138 xindex_modulo
- rindex_modulo
,
1140 } else if (rindex_modulo
== xindex_modulo
) {
1142 * Empty buffer, just return a single newline
1144 error
= sysctl_handle_opaque(oidp
, "\n", 1, req
);
1145 } else if (n
<= mbp
->msg_size
- rindex_modulo
) {
1147 * Can handle in one linear section.
1149 error
= sysctl_handle_opaque(oidp
,
1150 mbp
->msg_ptr
+ rindex_modulo
,
1155 * Glue together two linear sections into one contiguous
1158 error
= sysctl_handle_opaque(oidp
,
1159 mbp
->msg_ptr
+ rindex_modulo
,
1160 mbp
->msg_size
- rindex_modulo
,
1162 n
-= mbp
->msg_size
- rindex_modulo
;
1164 error
= sysctl_handle_opaque(oidp
, mbp
->msg_ptr
,
1170 SYSCTL_PROC(_kern
, OID_AUTO
, msgbuf
, CTLTYPE_STRING
| CTLFLAG_RD
,
1171 0, 0, sysctl_kern_msgbuf
, "A", "Contents of kernel message buffer");
1173 static int msgbuf_clear
;
1176 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS
)
1179 error
= sysctl_handle_int(oidp
, oidp
->oid_arg1
, oidp
->oid_arg2
, req
);
1180 if (!error
&& req
->newptr
) {
1181 /* Clear the buffer and reset write pointer */
1182 msgbufp
->msg_bufr
= msgbufp
->msg_bufx
;
1183 msgbufp
->msg_bufl
= msgbufp
->msg_bufx
;
1184 bzero(msgbufp
->msg_ptr
, msgbufp
->msg_size
);
1190 SYSCTL_PROC(_kern
, OID_AUTO
, msgbuf_clear
,
1191 CTLTYPE_INT
| CTLFLAG_RW
| CTLFLAG_SECURE
, &msgbuf_clear
, 0,
1192 sysctl_kern_msgbuf_clear
, "I", "Clear kernel message buffer");
1196 DB_SHOW_COMMAND(msgbuf
, db_show_msgbuf
)
1202 if (!msgbufmapped
) {
1203 db_printf("msgbuf not mapped yet\n");
1206 db_printf("msgbufp = %p\n", msgbufp
);
1207 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n",
1208 msgbufp
->msg_magic
, msgbufp
->msg_size
,
1209 msgbufp
->msg_bufr
% msgbufp
->msg_size
,
1210 msgbufp
->msg_bufx
% msgbufp
->msg_size
,
1213 rindex
= msgbufp
->msg_bufr
;
1214 for (i
= 0; i
< msgbufp
->msg_size
; i
++) {
1215 j
= (i
+ rindex
) % msgbufp
->msg_size
;
1216 db_printf("%c", msgbufp
->msg_ptr
[j
]);
1225 hexdump(const void *ptr
, int length
, const char *hdr
, int flags
)
1229 const unsigned char *cp
;
1232 if ((flags
& HD_DELIM_MASK
) != 0)
1233 delim
= (flags
& HD_DELIM_MASK
) >> 8;
1237 if ((flags
& HD_COLUMN_MASK
) != 0)
1238 cols
= flags
& HD_COLUMN_MASK
;
1243 for (i
= 0; i
< length
; i
+= cols
) {
1247 if ((flags
& HD_OMIT_COUNT
) == 0)
1248 kprintf("%04x ", i
);
1250 if ((flags
& HD_OMIT_HEX
) == 0) {
1251 for (j
= 0; j
< cols
; j
++) {
1254 kprintf("%c%02x", delim
, cp
[k
]);
1260 if ((flags
& HD_OMIT_CHARS
) == 0) {
1262 for (j
= 0; j
< cols
; j
++) {
1266 else if (cp
[k
] >= ' ' && cp
[k
] <= '~')
1267 kprintf("%c", cp
[k
]);
1278 kprint_cpuset(cpumask_t
*mask
)
1286 CPUSET_FOREACH(i
, *mask
) {
1301 kprintf("%d-%d", b
, e
- 1);
1313 kprintf("%d-%d", b
, e
- 1);