The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c

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    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: src/sys/kern/subr_prf.c,v 1.113.2.2 2005/09/29 18:45:02 rwatson Exp $");
   39 
   40 #include "opt_ddb.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/lock.h>
   45 #include <sys/kdb.h>
   46 #include <sys/mutex.h>
   47 #include <sys/sx.h>
   48 #include <sys/kernel.h>
   49 #include <sys/msgbuf.h>
   50 #include <sys/malloc.h>
   51 #include <sys/proc.h>
   52 #include <sys/stddef.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/tty.h>
   55 #include <sys/syslog.h>
   56 #include <sys/cons.h>
   57 #include <sys/uio.h>
   58 
   59 #ifdef DDB
   60 #include <ddb/ddb.h>
   61 #endif
   62 
   63 /*
   64  * Note that stdarg.h and the ANSI style va_start macro is used for both
   65  * ANSI and traditional C compilers.
   66  */
   67 #include <machine/stdarg.h>
   68 
   69 #define TOCONS  0x01
   70 #define TOTTY   0x02
   71 #define TOLOG   0x04
   72 
   73 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
   74 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
   75 
   76 struct putchar_arg {
   77         int     flags;
   78         int     pri;
   79         struct  tty *tty;
   80 };
   81 
   82 struct snprintf_arg {
   83         char    *str;
   84         size_t  remain;
   85 };
   86 
   87 extern  int log_open;
   88 
   89 static void  msglogchar(int c, int pri);
   90 static void  putchar(int ch, void *arg);
   91 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len);
   92 static void  snprintf_func(int ch, void *arg);
   93 
   94 static int consintr = 1;                /* Ok to handle console interrupts? */
   95 static int msgbufmapped;                /* Set when safe to use msgbuf */
   96 int msgbuftrigger;
   97 
   98 static int      log_console_output = 1;
   99 TUNABLE_INT("kern.log_console_output", &log_console_output);
  100 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
  101     &log_console_output, 0, "Duplicate console output to the syslog.");
  102 
  103 static int      always_console_output = 0;
  104 TUNABLE_INT("kern.always_console_output", &always_console_output);
  105 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
  106     &always_console_output, 0, "Always output to console despite TIOCCONS.");
  107 
  108 /*
  109  * Warn that a system table is full.
  110  */
  111 void
  112 tablefull(const char *tab)
  113 {
  114 
  115         log(LOG_ERR, "%s: table is full\n", tab);
  116 }
  117 
  118 /*
  119  * Uprintf prints to the controlling terminal for the current process.
  120  */
  121 int
  122 uprintf(const char *fmt, ...)
  123 {
  124         struct thread *td = curthread;
  125         struct proc *p = td->td_proc;
  126         va_list ap;
  127         struct putchar_arg pca;
  128         int retval;
  129 
  130         if (td == NULL || td == PCPU_GET(idlethread))
  131                 return (0);
  132 
  133         mtx_lock(&Giant);
  134         p = td->td_proc;
  135         PROC_LOCK(p);
  136         if ((p->p_flag & P_CONTROLT) == 0) {
  137                 PROC_UNLOCK(p);
  138                 retval = 0;
  139                 goto out;
  140         }
  141         SESS_LOCK(p->p_session);
  142         pca.tty = p->p_session->s_ttyp;
  143         SESS_UNLOCK(p->p_session);
  144         PROC_UNLOCK(p);
  145         if (pca.tty == NULL) {
  146                 retval = 0;
  147                 goto out;
  148         }
  149         pca.flags = TOTTY;
  150         va_start(ap, fmt);
  151         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  152         va_end(ap);
  153 out:
  154         mtx_unlock(&Giant);
  155         return (retval);
  156 }
  157 
  158 /*
  159  * tprintf prints on the controlling terminal associated with the given
  160  * session, possibly to the log as well.
  161  */
  162 void
  163 tprintf(struct proc *p, int pri, const char *fmt, ...)
  164 {
  165         struct tty *tp = NULL;
  166         int flags = 0;
  167         va_list ap;
  168         struct putchar_arg pca;
  169         struct session *sess = NULL;
  170 
  171         mtx_lock(&Giant);
  172         if (pri != -1)
  173                 flags |= TOLOG;
  174         if (p != NULL) {
  175                 PROC_LOCK(p);
  176                 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
  177                         sess = p->p_session;
  178                         SESS_LOCK(sess);
  179                         PROC_UNLOCK(p);
  180                         SESSHOLD(sess);
  181                         tp = sess->s_ttyp;
  182                         SESS_UNLOCK(sess);
  183                         if (ttycheckoutq(tp, 0))
  184                                 flags |= TOTTY;
  185                         else
  186                                 tp = NULL;
  187                 } else
  188                         PROC_UNLOCK(p);
  189         }
  190         pca.pri = pri;
  191         pca.tty = tp;
  192         pca.flags = flags;
  193         va_start(ap, fmt);
  194         kvprintf(fmt, putchar, &pca, 10, ap);
  195         va_end(ap);
  196         if (sess != NULL) {
  197                 SESS_LOCK(sess);
  198                 SESSRELE(sess);
  199                 SESS_UNLOCK(sess);
  200         }
  201         msgbuftrigger = 1;
  202         mtx_unlock(&Giant);
  203 }
  204 
  205 /*
  206  * Ttyprintf displays a message on a tty; it should be used only by
  207  * the tty driver, or anything that knows the underlying tty will not
  208  * be revoke(2)'d away.  Other callers should use tprintf.
  209  */
  210 int
  211 ttyprintf(struct tty *tp, const char *fmt, ...)
  212 {
  213         va_list ap;
  214         struct putchar_arg pca;
  215         int retval;
  216 
  217         va_start(ap, fmt);
  218         pca.tty = tp;
  219         pca.flags = TOTTY;
  220         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  221         va_end(ap);
  222         return (retval);
  223 }
  224 
  225 /*
  226  * Log writes to the log buffer, and guarantees not to sleep (so can be
  227  * called by interrupt routines).  If there is no process reading the
  228  * log yet, it writes to the console also.
  229  */
  230 void
  231 log(int level, const char *fmt, ...)
  232 {
  233         va_list ap;
  234         struct putchar_arg pca;
  235 
  236         pca.tty = NULL;
  237         pca.pri = level;
  238         pca.flags = log_open ? TOLOG : TOCONS;
  239 
  240         va_start(ap, fmt);
  241         kvprintf(fmt, putchar, &pca, 10, ap);
  242         va_end(ap);
  243 
  244         msgbuftrigger = 1;
  245 }
  246 
  247 #define CONSCHUNK 128
  248 
  249 void
  250 log_console(struct uio *uio)
  251 {
  252         int c, i, error, nl;
  253         char *consbuffer;
  254         int pri;
  255 
  256         if (!log_console_output)
  257                 return;
  258 
  259         pri = LOG_INFO | LOG_CONSOLE;
  260         uio = cloneuio(uio);
  261         consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
  262 
  263         nl = 0;
  264         while (uio->uio_resid > 0) {
  265                 c = imin(uio->uio_resid, CONSCHUNK);
  266                 error = uiomove(consbuffer, c, uio);
  267                 if (error != 0)
  268                         break;
  269                 for (i = 0; i < c; i++) {
  270                         msglogchar(consbuffer[i], pri);
  271                         if (consbuffer[i] == '\n')
  272                                 nl = 1;
  273                         else
  274                                 nl = 0;
  275                 }
  276         }
  277         if (!nl)
  278                 msglogchar('\n', pri);
  279         msgbuftrigger = 1;
  280         free(uio, M_IOV);
  281         free(consbuffer, M_TEMP);
  282         return;
  283 }
  284 
  285 int
  286 printf(const char *fmt, ...)
  287 {
  288         va_list ap;
  289         int savintr;
  290         struct putchar_arg pca;
  291         int retval;
  292 
  293         savintr = consintr;             /* disable interrupts */
  294         consintr = 0;
  295         va_start(ap, fmt);
  296         pca.tty = NULL;
  297         pca.flags = TOCONS | TOLOG;
  298         pca.pri = -1;
  299         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  300         va_end(ap);
  301         if (!panicstr)
  302                 msgbuftrigger = 1;
  303         consintr = savintr;             /* reenable interrupts */
  304         return (retval);
  305 }
  306 
  307 int
  308 vprintf(const char *fmt, va_list ap)
  309 {
  310         int savintr;
  311         struct putchar_arg pca;
  312         int retval;
  313 
  314         savintr = consintr;             /* disable interrupts */
  315         consintr = 0;
  316         pca.tty = NULL;
  317         pca.flags = TOCONS | TOLOG;
  318         pca.pri = -1;
  319         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  320         if (!panicstr)
  321                 msgbuftrigger = 1;
  322         consintr = savintr;             /* reenable interrupts */
  323         return (retval);
  324 }
  325 
  326 /*
  327  * Print a character on console or users terminal.  If destination is
  328  * the console then the last bunch of characters are saved in msgbuf for
  329  * inspection later.
  330  */
  331 static void
  332 putchar(int c, void *arg)
  333 {
  334         struct putchar_arg *ap = (struct putchar_arg*) arg;
  335         struct tty *tp = ap->tty;
  336         int consdirect, flags = ap->flags;
  337 
  338         consdirect = ((flags & TOCONS) && constty == NULL);
  339         /* Don't use the tty code after a panic or while in ddb. */
  340         if (panicstr)
  341                 consdirect = 1;
  342         if (kdb_active)
  343                 consdirect = 1;
  344         if (consdirect) {
  345                 if (c != '\0')
  346                         cnputc(c);
  347         } else {
  348                 if ((flags & TOTTY) && tp != NULL)
  349                         tputchar(c, tp);
  350                 if (flags & TOCONS) {
  351                         if (constty != NULL)
  352                                 msgbuf_addchar(&consmsgbuf, c);
  353                         if (always_console_output && c != '\0')
  354                                 cnputc(c);
  355                 }
  356         }
  357         if ((flags & TOLOG))
  358                 msglogchar(c, ap->pri);
  359 }
  360 
  361 /*
  362  * Scaled down version of sprintf(3).
  363  */
  364 int
  365 sprintf(char *buf, const char *cfmt, ...)
  366 {
  367         int retval;
  368         va_list ap;
  369 
  370         va_start(ap, cfmt);
  371         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  372         buf[retval] = '\0';
  373         va_end(ap);
  374         return (retval);
  375 }
  376 
  377 /*
  378  * Scaled down version of vsprintf(3).
  379  */
  380 int
  381 vsprintf(char *buf, const char *cfmt, va_list ap)
  382 {
  383         int retval;
  384 
  385         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  386         buf[retval] = '\0';
  387         return (retval);
  388 }
  389 
  390 /*
  391  * Scaled down version of snprintf(3).
  392  */
  393 int
  394 snprintf(char *str, size_t size, const char *format, ...)
  395 {
  396         int retval;
  397         va_list ap;
  398 
  399         va_start(ap, format);
  400         retval = vsnprintf(str, size, format, ap);
  401         va_end(ap);
  402         return(retval);
  403 }
  404 
  405 /*
  406  * Scaled down version of vsnprintf(3).
  407  */
  408 int
  409 vsnprintf(char *str, size_t size, const char *format, va_list ap)
  410 {
  411         struct snprintf_arg info;
  412         int retval;
  413 
  414         info.str = str;
  415         info.remain = size;
  416         retval = kvprintf(format, snprintf_func, &info, 10, ap);
  417         if (info.remain >= 1)
  418                 *info.str++ = '\0';
  419         return (retval);
  420 }
  421 
  422 /*
  423  * Kernel version which takes radix argument vsnprintf(3).
  424  */
  425 int
  426 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
  427 {
  428         struct snprintf_arg info;
  429         int retval;
  430 
  431         info.str = str;
  432         info.remain = size;
  433         retval = kvprintf(format, snprintf_func, &info, radix, ap);
  434         if (info.remain >= 1)
  435                 *info.str++ = '\0';
  436         return (retval);
  437 }
  438 
  439 static void
  440 snprintf_func(int ch, void *arg)
  441 {
  442         struct snprintf_arg *const info = arg;
  443 
  444         if (info->remain >= 2) {
  445                 *info->str++ = ch;
  446                 info->remain--;
  447         }
  448 }
  449 
  450 /*
  451  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
  452  * order; return an optional length and a pointer to the last character
  453  * written in the buffer (i.e., the first character of the string).
  454  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
  455  */
  456 static char *
  457 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp)
  458 {
  459         char *p;
  460 
  461         p = nbuf;
  462         *p = '\0';
  463         do {
  464                 *++p = hex2ascii(num % base);
  465         } while (num /= base);
  466         if (lenp)
  467                 *lenp = p - nbuf;
  468         return (p);
  469 }
  470 
  471 /*
  472  * Scaled down version of printf(3).
  473  *
  474  * Two additional formats:
  475  *
  476  * The format %b is supported to decode error registers.
  477  * Its usage is:
  478  *
  479  *      printf("reg=%b\n", regval, "<base><arg>*");
  480  *
  481  * where <base> is the output base expressed as a control character, e.g.
  482  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
  483  * the first of which gives the bit number to be inspected (origin 1), and
  484  * the next characters (up to a control character, i.e. a character <= 32),
  485  * give the name of the register.  Thus:
  486  *
  487  *      kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
  488  *
  489  * would produce output:
  490  *
  491  *      reg=3<BITTWO,BITONE>
  492  *
  493  * XXX:  %D  -- Hexdump, takes pointer and separator string:
  494  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
  495  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
  496  */
  497 int
  498 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
  499 {
  500 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
  501         char nbuf[MAXNBUF];
  502         char *d;
  503         const char *p, *percent, *q;
  504         u_char *up;
  505         int ch, n;
  506         uintmax_t num;
  507         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
  508         int cflag, hflag, jflag, tflag, zflag;
  509         int dwidth;
  510         char padc;
  511         int retval = 0;
  512 
  513         num = 0;
  514         if (!func)
  515                 d = (char *) arg;
  516         else
  517                 d = NULL;
  518 
  519         if (fmt == NULL)
  520                 fmt = "(fmt null)\n";
  521 
  522         if (radix < 2 || radix > 36)
  523                 radix = 10;
  524 
  525         for (;;) {
  526                 padc = ' ';
  527                 width = 0;
  528                 while ((ch = (u_char)*fmt++) != '%') {
  529                         if (ch == '\0')
  530                                 return (retval);
  531                         PCHAR(ch);
  532                 }
  533                 percent = fmt - 1;
  534                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
  535                 sign = 0; dot = 0; dwidth = 0;
  536                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
  537 reswitch:       switch (ch = (u_char)*fmt++) {
  538                 case '.':
  539                         dot = 1;
  540                         goto reswitch;
  541                 case '#':
  542                         sharpflag = 1;
  543                         goto reswitch;
  544                 case '+':
  545                         sign = 1;
  546                         goto reswitch;
  547                 case '-':
  548                         ladjust = 1;
  549                         goto reswitch;
  550                 case '%':
  551                         PCHAR(ch);
  552                         break;
  553                 case '*':
  554                         if (!dot) {
  555                                 width = va_arg(ap, int);
  556                                 if (width < 0) {
  557                                         ladjust = !ladjust;
  558                                         width = -width;
  559                                 }
  560                         } else {
  561                                 dwidth = va_arg(ap, int);
  562                         }
  563                         goto reswitch;
  564                 case '':
  565                         if (!dot) {
  566                                 padc = '';
  567                                 goto reswitch;
  568                         }
  569                 case '1': case '2': case '3': case '4':
  570                 case '5': case '6': case '7': case '8': case '9':
  571                                 for (n = 0;; ++fmt) {
  572                                         n = n * 10 + ch - '';
  573                                         ch = *fmt;
  574                                         if (ch < '' || ch > '9')
  575                                                 break;
  576                                 }
  577                         if (dot)
  578                                 dwidth = n;
  579                         else
  580                                 width = n;
  581                         goto reswitch;
  582                 case 'b':
  583                         num = (u_int)va_arg(ap, int);
  584                         p = va_arg(ap, char *);
  585                         for (q = ksprintn(nbuf, num, *p++, NULL); *q;)
  586                                 PCHAR(*q--);
  587 
  588                         if (num == 0)
  589                                 break;
  590 
  591                         for (tmp = 0; *p;) {
  592                                 n = *p++;
  593                                 if (num & (1 << (n - 1))) {
  594                                         PCHAR(tmp ? ',' : '<');
  595                                         for (; (n = *p) > ' '; ++p)
  596                                                 PCHAR(n);
  597                                         tmp = 1;
  598                                 } else
  599                                         for (; *p > ' '; ++p)
  600                                                 continue;
  601                         }
  602                         if (tmp)
  603                                 PCHAR('>');
  604                         break;
  605                 case 'c':
  606                         PCHAR(va_arg(ap, int));
  607                         break;
  608                 case 'D':
  609                         up = va_arg(ap, u_char *);
  610                         p = va_arg(ap, char *);
  611                         if (!width)
  612                                 width = 16;
  613                         while(width--) {
  614                                 PCHAR(hex2ascii(*up >> 4));
  615                                 PCHAR(hex2ascii(*up & 0x0f));
  616                                 up++;
  617                                 if (width)
  618                                         for (q=p;*q;q++)
  619                                                 PCHAR(*q);
  620                         }
  621                         break;
  622                 case 'd':
  623                 case 'i':
  624                         base = 10;
  625                         sign = 1;
  626                         goto handle_sign;
  627                 case 'h':
  628                         if (hflag) {
  629                                 hflag = 0;
  630                                 cflag = 1;
  631                         } else
  632                                 hflag = 1;
  633                         goto reswitch;
  634                 case 'j':
  635                         jflag = 1;
  636                         goto reswitch;
  637                 case 'l':
  638                         if (lflag) {
  639                                 lflag = 0;
  640                                 qflag = 1;
  641                         } else
  642                                 lflag = 1;
  643                         goto reswitch;
  644                 case 'n':
  645                         if (jflag)
  646                                 *(va_arg(ap, intmax_t *)) = retval;
  647                         else if (qflag)
  648                                 *(va_arg(ap, quad_t *)) = retval;
  649                         else if (lflag)
  650                                 *(va_arg(ap, long *)) = retval;
  651                         else if (zflag)
  652                                 *(va_arg(ap, size_t *)) = retval;
  653                         else if (hflag)
  654                                 *(va_arg(ap, short *)) = retval;
  655                         else if (cflag)
  656                                 *(va_arg(ap, char *)) = retval;
  657                         else
  658                                 *(va_arg(ap, int *)) = retval;
  659                         break;
  660                 case 'o':
  661                         base = 8;
  662                         goto handle_nosign;
  663                 case 'p':
  664                         base = 16;
  665                         sharpflag = (width == 0);
  666                         sign = 0;
  667                         num = (uintptr_t)va_arg(ap, void *);
  668                         goto number;
  669                 case 'q':
  670                         qflag = 1;
  671                         goto reswitch;
  672                 case 'r':
  673                         base = radix;
  674                         if (sign)
  675                                 goto handle_sign;
  676                         goto handle_nosign;
  677                 case 's':
  678                         p = va_arg(ap, char *);
  679                         if (p == NULL)
  680                                 p = "(null)";
  681                         if (!dot)
  682                                 n = strlen (p);
  683                         else
  684                                 for (n = 0; n < dwidth && p[n]; n++)
  685                                         continue;
  686 
  687                         width -= n;
  688 
  689                         if (!ladjust && width > 0)
  690                                 while (width--)
  691                                         PCHAR(padc);
  692                         while (n--)
  693                                 PCHAR(*p++);
  694                         if (ladjust && width > 0)
  695                                 while (width--)
  696                                         PCHAR(padc);
  697                         break;
  698                 case 't':
  699                         tflag = 1;
  700                         goto reswitch;
  701                 case 'u':
  702                         base = 10;
  703                         goto handle_nosign;
  704                 case 'x':
  705                 case 'X':
  706                         base = 16;
  707                         goto handle_nosign;
  708                 case 'y':
  709                         base = 16;
  710                         sign = 1;
  711                         goto handle_sign;
  712                 case 'z':
  713                         zflag = 1;
  714                         goto reswitch;
  715 handle_nosign:
  716                         sign = 0;
  717                         if (jflag)
  718                                 num = va_arg(ap, uintmax_t);
  719                         else if (qflag)
  720                                 num = va_arg(ap, u_quad_t);
  721                         else if (tflag)
  722                                 num = va_arg(ap, ptrdiff_t);
  723                         else if (lflag)
  724                                 num = va_arg(ap, u_long);
  725                         else if (zflag)
  726                                 num = va_arg(ap, size_t);
  727                         else if (hflag)
  728                                 num = (u_short)va_arg(ap, int);
  729                         else if (cflag)
  730                                 num = (u_char)va_arg(ap, int);
  731                         else
  732                                 num = va_arg(ap, u_int);
  733                         goto number;
  734 handle_sign:
  735                         if (jflag)
  736                                 num = va_arg(ap, intmax_t);
  737                         else if (qflag)
  738                                 num = va_arg(ap, quad_t);
  739                         else if (tflag)
  740                                 num = va_arg(ap, ptrdiff_t);
  741                         else if (lflag)
  742                                 num = va_arg(ap, long);
  743                         else if (zflag)
  744                                 num = va_arg(ap, size_t);
  745                         else if (hflag)
  746                                 num = (short)va_arg(ap, int);
  747                         else if (cflag)
  748                                 num = (char)va_arg(ap, int);
  749                         else
  750                                 num = va_arg(ap, int);
  751 number:
  752                         if (sign && (intmax_t)num < 0) {
  753                                 neg = 1;
  754                                 num = -(intmax_t)num;
  755                         }
  756                         p = ksprintn(nbuf, num, base, &tmp);
  757                         if (sharpflag && num != 0) {
  758                                 if (base == 8)
  759                                         tmp++;
  760                                 else if (base == 16)
  761                                         tmp += 2;
  762                         }
  763                         if (neg)
  764                                 tmp++;
  765 
  766                         if (!ladjust && padc != '' && width
  767                             && (width -= tmp) > 0)
  768                                 while (width--)
  769                                         PCHAR(padc);
  770                         if (neg)
  771                                 PCHAR('-');
  772                         if (sharpflag && num != 0) {
  773                                 if (base == 8) {
  774                                         PCHAR('');
  775                                 } else if (base == 16) {
  776                                         PCHAR('');
  777                                         PCHAR('x');
  778                                 }
  779                         }
  780                         if (!ladjust && width && (width -= tmp) > 0)
  781                                 while (width--)
  782                                         PCHAR(padc);
  783 
  784                         while (*p)
  785                                 PCHAR(*p--);
  786 
  787                         if (ladjust && width && (width -= tmp) > 0)
  788                                 while (width--)
  789                                         PCHAR(padc);
  790 
  791                         break;
  792                 default:
  793                         while (percent < fmt)
  794                                 PCHAR(*percent++);
  795                         break;
  796                 }
  797         }
  798 #undef PCHAR
  799 }
  800 
  801 /*
  802  * Put character in log buffer with a particular priority.
  803  */
  804 static void
  805 msglogchar(int c, int pri)
  806 {
  807         static int lastpri = -1;
  808         static int dangling;
  809         char nbuf[MAXNBUF];
  810         char *p;
  811 
  812         if (!msgbufmapped)
  813                 return;
  814         if (c == '\0' || c == '\r')
  815                 return;
  816         if (pri != -1 && pri != lastpri) {
  817                 if (dangling) {
  818                         msgbuf_addchar(msgbufp, '\n');
  819                         dangling = 0;
  820                 }
  821                 msgbuf_addchar(msgbufp, '<');
  822                 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;)
  823                         msgbuf_addchar(msgbufp, *p--);
  824                 msgbuf_addchar(msgbufp, '>');
  825                 lastpri = pri;
  826         }
  827         msgbuf_addchar(msgbufp, c);
  828         if (c == '\n') {
  829                 dangling = 0;
  830                 lastpri = -1;
  831         } else {
  832                 dangling = 1;
  833         }
  834 }
  835 
  836 void
  837 msgbufinit(void *ptr, int size)
  838 {
  839         char *cp;
  840         static struct msgbuf *oldp = NULL;
  841 
  842         size -= sizeof(*msgbufp);
  843         cp = (char *)ptr;
  844         msgbufp = (struct msgbuf *)(cp + size);
  845         msgbuf_reinit(msgbufp, cp, size);
  846         if (msgbufmapped && oldp != msgbufp)
  847                 msgbuf_copy(oldp, msgbufp);
  848         msgbufmapped = 1;
  849         oldp = msgbufp;
  850 }
  851 
  852 SYSCTL_DECL(_security_bsd);
  853 
  854 static int unprivileged_read_msgbuf = 1;
  855 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
  856     CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
  857     "Unprivileged processes may read the kernel message buffer");
  858 
  859 /* Sysctls for accessing/clearing the msgbuf */
  860 static int
  861 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
  862 {
  863         char buf[128];
  864         u_int seq;
  865         int error, len;
  866 
  867         if (!unprivileged_read_msgbuf) {
  868                 error = suser(req->td);
  869                 if (error)
  870                         return (error);
  871         }
  872 
  873         /* Read the whole buffer, one chunk at a time. */
  874         msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
  875         while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
  876                 error = sysctl_handle_opaque(oidp, buf, len, req);
  877                 if (error)
  878                         return (error);
  879         }
  880         return (0);
  881 }
  882 
  883 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
  884     0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
  885 
  886 static int msgbuf_clearflag;
  887 
  888 static int
  889 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
  890 {
  891         int error;
  892         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
  893         if (!error && req->newptr) {
  894                 msgbuf_clear(msgbufp);
  895                 msgbuf_clearflag = 0;
  896         }
  897         return (error);
  898 }
  899 
  900 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
  901     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
  902     sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
  903 
  904 #ifdef DDB
  905 
  906 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
  907 {
  908         int i, j;
  909 
  910         if (!msgbufmapped) {
  911                 db_printf("msgbuf not mapped yet\n");
  912                 return;
  913         }
  914         db_printf("msgbufp = %p\n", msgbufp);
  915         db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
  916             msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
  917             msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
  918         for (i = 0; i < msgbufp->msg_size; i++) {
  919                 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
  920                 db_printf("%c", msgbufp->msg_ptr[j]);
  921         }
  922         db_printf("\n");
  923 }
  924 
  925 #endif /* DDB */
  926 
  927 void
  928 hexdump(void *ptr, int length, const char *hdr, int flags)
  929 {
  930         int i, j, k;
  931         int cols;
  932         unsigned char *cp;
  933         char delim;
  934 
  935         if ((flags & HD_DELIM_MASK) != 0)
  936                 delim = (flags & HD_DELIM_MASK) >> 8;
  937         else
  938                 delim = ' ';
  939 
  940         if ((flags & HD_COLUMN_MASK) != 0)
  941                 cols = flags & HD_COLUMN_MASK;
  942         else
  943                 cols = 16;
  944 
  945         cp = ptr;
  946         for (i = 0; i < length; i+= cols) {
  947                 if (hdr != NULL)
  948                         printf("%s", hdr);
  949 
  950                 if ((flags & HD_OMIT_COUNT) == 0)
  951                         printf("%04x  ", i);
  952 
  953                 if ((flags & HD_OMIT_HEX) == 0) {
  954                         for (j = 0; j < cols; j++) {
  955                                 k = i + j;
  956                                 if (k < length)
  957                                         printf("%c%02x", delim, cp[k]);
  958                                 else
  959                                         printf("   ");
  960                         }
  961                 }
  962 
  963                 if ((flags & HD_OMIT_CHARS) == 0) {
  964                         printf("  |");
  965                         for (j = 0; j < cols; j++) {
  966                                 k = i + j;
  967                                 if (k >= length)
  968                                         printf(" ");
  969                                 else if (cp[k] >= ' ' && cp[k] <= '~')
  970                                         printf("%c", cp[k]);
  971                                 else
  972                                         printf(".");
  973                         }
  974                         printf("|\n");
  975                 }
  976         }
  977 }
  978 

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