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: releng/10.1/sys/kern/subr_prf.c 266197 2014-05-15 21:41:32Z ian $");
   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                 sx_sunlock(&proctree_lock);
  155                 return (0);
  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                 sx_sunlock(&proctree_lock);
  163                 return (0);
  164         }
  165         pca.flags = TOTTY;
  166         pca.p_bufr = NULL;
  167         va_start(ap, fmt);
  168         tty_lock(pca.tty);
  169         sx_sunlock(&proctree_lock);
  170         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  171         tty_unlock(pca.tty);
  172         va_end(ap);
  173         return (retval);
  174 }
  175 
  176 /*
  177  * tprintf and vtprintf print on the controlling terminal associated with the
  178  * given session, possibly to the log as well.
  179  */
  180 void
  181 tprintf(struct proc *p, int pri, const char *fmt, ...)
  182 {
  183         va_list ap;
  184 
  185         va_start(ap, fmt);
  186         vtprintf(p, pri, fmt, ap);
  187         va_end(ap);
  188 }
  189 
  190 void
  191 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
  192 {
  193         struct tty *tp = NULL;
  194         int flags = 0;
  195         struct putchar_arg pca;
  196         struct session *sess = NULL;
  197 
  198         sx_slock(&proctree_lock);
  199         if (pri != -1)
  200                 flags |= TOLOG;
  201         if (p != NULL) {
  202                 PROC_LOCK(p);
  203                 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
  204                         sess = p->p_session;
  205                         sess_hold(sess);
  206                         PROC_UNLOCK(p);
  207                         tp = sess->s_ttyp;
  208                         if (tp != NULL && tty_checkoutq(tp))
  209                                 flags |= TOTTY;
  210                         else
  211                                 tp = NULL;
  212                 } else
  213                         PROC_UNLOCK(p);
  214         }
  215         pca.pri = pri;
  216         pca.tty = tp;
  217         pca.flags = flags;
  218         pca.p_bufr = NULL;
  219         if (pca.tty != NULL)
  220                 tty_lock(pca.tty);
  221         sx_sunlock(&proctree_lock);
  222         kvprintf(fmt, putchar, &pca, 10, ap);
  223         if (pca.tty != NULL)
  224                 tty_unlock(pca.tty);
  225         if (sess != NULL)
  226                 sess_release(sess);
  227         msgbuftrigger = 1;
  228 }
  229 
  230 /*
  231  * Ttyprintf displays a message on a tty; it should be used only by
  232  * the tty driver, or anything that knows the underlying tty will not
  233  * be revoke(2)'d away.  Other callers should use tprintf.
  234  */
  235 int
  236 ttyprintf(struct tty *tp, const char *fmt, ...)
  237 {
  238         va_list ap;
  239         struct putchar_arg pca;
  240         int retval;
  241 
  242         va_start(ap, fmt);
  243         pca.tty = tp;
  244         pca.flags = TOTTY;
  245         pca.p_bufr = NULL;
  246         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  247         va_end(ap);
  248         return (retval);
  249 }
  250 
  251 static int
  252 _vprintf(int level, int flags, const char *fmt, va_list ap)
  253 {
  254         struct putchar_arg pca;
  255         int retval;
  256 #ifdef PRINTF_BUFR_SIZE
  257         char bufr[PRINTF_BUFR_SIZE];
  258 #endif
  259 
  260         pca.tty = NULL;
  261         pca.pri = level;
  262         pca.flags = flags;
  263 #ifdef PRINTF_BUFR_SIZE
  264         pca.p_bufr = bufr;
  265         pca.p_next = pca.p_bufr;
  266         pca.n_bufr = sizeof(bufr);
  267         pca.remain = sizeof(bufr);
  268         *pca.p_next = '\0';
  269 #else
  270         /* Don't buffer console output. */
  271         pca.p_bufr = NULL;
  272 #endif
  273 
  274         retval = kvprintf(fmt, putchar, &pca, 10, 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 
  287         return (retval);
  288 }
  289 
  290 /*
  291  * Log writes to the log buffer, and guarantees not to sleep (so can be
  292  * called by interrupt routines).  If there is no process reading the
  293  * log yet, it writes to the console also.
  294  */
  295 void
  296 log(int level, const char *fmt, ...)
  297 {
  298         va_list ap;
  299 
  300         va_start(ap, fmt);
  301         (void)_vprintf(level, log_open ? TOLOG : TOCONS, fmt, ap);
  302         va_end(ap);
  303 
  304         msgbuftrigger = 1;
  305 }
  306 
  307 #define CONSCHUNK 128
  308 
  309 void
  310 log_console(struct uio *uio)
  311 {
  312         int c, error, nl;
  313         char *consbuffer;
  314         int pri;
  315 
  316         if (!log_console_output)
  317                 return;
  318 
  319         pri = LOG_INFO | LOG_CONSOLE;
  320         uio = cloneuio(uio);
  321         consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
  322 
  323         nl = 0;
  324         while (uio->uio_resid > 0) {
  325                 c = imin(uio->uio_resid, CONSCHUNK - 1);
  326                 error = uiomove(consbuffer, c, uio);
  327                 if (error != 0)
  328                         break;
  329                 /* Make sure we're NUL-terminated */
  330                 consbuffer[c] = '\0';
  331                 if (consbuffer[c - 1] == '\n')
  332                         nl = 1;
  333                 else
  334                         nl = 0;
  335                 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
  336         }
  337         /*
  338          * The previous behavior in log_console() is preserved when
  339          * log_console_add_linefeed is non-zero.  For that behavior, if an
  340          * individual console write came in that was not terminated with a
  341          * line feed, it would add a line feed.
  342          *
  343          * This results in different data in the message buffer than
  344          * appears on the system console (which doesn't add extra line feed
  345          * characters).
  346          *
  347          * A number of programs and rc scripts write a line feed, or a period
  348          * and a line feed when they have completed their operation.  On
  349          * the console, this looks seamless, but when displayed with
  350          * 'dmesg -a', you wind up with output that looks like this:
  351          *
  352          * Updating motd:
  353          * .
  354          *
  355          * On the console, it looks like this:
  356          * Updating motd:.
  357          *
  358          * We could add logic to detect that situation, or just not insert
  359          * the extra newlines.  Set the kern.log_console_add_linefeed
  360          * sysctl/tunable variable to get the old behavior.
  361          */
  362         if (!nl && log_console_add_linefeed) {
  363                 consbuffer[0] = '\n';
  364                 consbuffer[1] = '\0';
  365                 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
  366         }
  367         msgbuftrigger = 1;
  368         free(uio, M_IOV);
  369         free(consbuffer, M_TEMP);
  370         return;
  371 }
  372 
  373 int
  374 printf(const char *fmt, ...)
  375 {
  376         va_list ap;
  377         int retval;
  378 
  379         va_start(ap, fmt);
  380         retval = vprintf(fmt, ap);
  381         va_end(ap);
  382 
  383         return (retval);
  384 }
  385 
  386 int
  387 vprintf(const char *fmt, va_list ap)
  388 {
  389         int retval;
  390 
  391         retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
  392 
  393         if (!panicstr)
  394                 msgbuftrigger = 1;
  395 
  396         return (retval);
  397 }
  398 
  399 static void
  400 putbuf(int c, struct putchar_arg *ap)
  401 {
  402         /* Check if no console output buffer was provided. */
  403         if (ap->p_bufr == NULL) {
  404                 /* Output direct to the console. */
  405                 if (ap->flags & TOCONS)
  406                         cnputc(c);
  407 
  408                 if (ap->flags & TOLOG)
  409                         msglogchar(c, ap->pri);
  410         } else {
  411                 /* Buffer the character: */
  412                 *ap->p_next++ = c;
  413                 ap->remain--;
  414 
  415                 /* Always leave the buffer zero terminated. */
  416                 *ap->p_next = '\0';
  417 
  418                 /* Check if the buffer needs to be flushed. */
  419                 if (ap->remain == 2 || c == '\n') {
  420 
  421                         if (ap->flags & TOLOG)
  422                                 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
  423 
  424                         if (ap->flags & TOCONS) {
  425                                 if ((panicstr == NULL) && (constty != NULL))
  426                                         msgbuf_addstr(&consmsgbuf, -1,
  427                                             ap->p_bufr, /*filter_cr*/ 0);
  428 
  429                                 if ((constty == NULL) ||(always_console_output))
  430                                         cnputs(ap->p_bufr);
  431                         }
  432 
  433                         ap->p_next = ap->p_bufr;
  434                         ap->remain = ap->n_bufr;
  435                         *ap->p_next = '\0';
  436                 }
  437 
  438                 /*
  439                  * Since we fill the buffer up one character at a time,
  440                  * this should not happen.  We should always catch it when
  441                  * ap->remain == 2 (if not sooner due to a newline), flush
  442                  * the buffer and move on.  One way this could happen is
  443                  * if someone sets PRINTF_BUFR_SIZE to 1 or something
  444                  * similarly silly.
  445                  */
  446                 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
  447                     ap->remain));
  448         }
  449 }
  450 
  451 /*
  452  * Print a character on console or users terminal.  If destination is
  453  * the console then the last bunch of characters are saved in msgbuf for
  454  * inspection later.
  455  */
  456 static void
  457 putchar(int c, void *arg)
  458 {
  459         struct putchar_arg *ap = (struct putchar_arg*) arg;
  460         struct tty *tp = ap->tty;
  461         int flags = ap->flags;
  462 
  463         /* Don't use the tty code after a panic or while in ddb. */
  464         if (kdb_active) {
  465                 if (c != '\0')
  466                         cnputc(c);
  467                 return;
  468         }
  469 
  470         if ((flags & TOTTY) && tp != NULL && panicstr == NULL)
  471                 tty_putchar(tp, c);
  472 
  473         if ((flags & (TOCONS | TOLOG)) && c != '\0')
  474                 putbuf(c, ap);
  475 }
  476 
  477 /*
  478  * Scaled down version of sprintf(3).
  479  */
  480 int
  481 sprintf(char *buf, const char *cfmt, ...)
  482 {
  483         int retval;
  484         va_list ap;
  485 
  486         va_start(ap, cfmt);
  487         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  488         buf[retval] = '\0';
  489         va_end(ap);
  490         return (retval);
  491 }
  492 
  493 /*
  494  * Scaled down version of vsprintf(3).
  495  */
  496 int
  497 vsprintf(char *buf, const char *cfmt, va_list ap)
  498 {
  499         int retval;
  500 
  501         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  502         buf[retval] = '\0';
  503         return (retval);
  504 }
  505 
  506 /*
  507  * Scaled down version of snprintf(3).
  508  */
  509 int
  510 snprintf(char *str, size_t size, const char *format, ...)
  511 {
  512         int retval;
  513         va_list ap;
  514 
  515         va_start(ap, format);
  516         retval = vsnprintf(str, size, format, ap);
  517         va_end(ap);
  518         return(retval);
  519 }
  520 
  521 /*
  522  * Scaled down version of vsnprintf(3).
  523  */
  524 int
  525 vsnprintf(char *str, size_t size, const char *format, va_list ap)
  526 {
  527         struct snprintf_arg info;
  528         int retval;
  529 
  530         info.str = str;
  531         info.remain = size;
  532         retval = kvprintf(format, snprintf_func, &info, 10, ap);
  533         if (info.remain >= 1)
  534                 *info.str++ = '\0';
  535         return (retval);
  536 }
  537 
  538 /*
  539  * Kernel version which takes radix argument vsnprintf(3).
  540  */
  541 int
  542 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
  543 {
  544         struct snprintf_arg info;
  545         int retval;
  546 
  547         info.str = str;
  548         info.remain = size;
  549         retval = kvprintf(format, snprintf_func, &info, radix, ap);
  550         if (info.remain >= 1)
  551                 *info.str++ = '\0';
  552         return (retval);
  553 }
  554 
  555 static void
  556 snprintf_func(int ch, void *arg)
  557 {
  558         struct snprintf_arg *const info = arg;
  559 
  560         if (info->remain >= 2) {
  561                 *info->str++ = ch;
  562                 info->remain--;
  563         }
  564 }
  565 
  566 /*
  567  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
  568  * order; return an optional length and a pointer to the last character
  569  * written in the buffer (i.e., the first character of the string).
  570  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
  571  */
  572 static char *
  573 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
  574 {
  575         char *p, c;
  576 
  577         p = nbuf;
  578         *p = '\0';
  579         do {
  580                 c = hex2ascii(num % base);
  581                 *++p = upper ? toupper(c) : c;
  582         } while (num /= base);
  583         if (lenp)
  584                 *lenp = p - nbuf;
  585         return (p);
  586 }
  587 
  588 /*
  589  * Scaled down version of printf(3).
  590  *
  591  * Two additional formats:
  592  *
  593  * The format %b is supported to decode error registers.
  594  * Its usage is:
  595  *
  596  *      printf("reg=%b\n", regval, "<base><arg>*");
  597  *
  598  * where <base> is the output base expressed as a control character, e.g.
  599  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
  600  * the first of which gives the bit number to be inspected (origin 1), and
  601  * the next characters (up to a control character, i.e. a character <= 32),
  602  * give the name of the register.  Thus:
  603  *
  604  *      kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
  605  *
  606  * would produce output:
  607  *
  608  *      reg=3<BITTWO,BITONE>
  609  *
  610  * XXX:  %D  -- Hexdump, takes pointer and separator string:
  611  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
  612  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
  613  */
  614 int
  615 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
  616 {
  617 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
  618         char nbuf[MAXNBUF];
  619         char *d;
  620         const char *p, *percent, *q;
  621         u_char *up;
  622         int ch, n;
  623         uintmax_t num;
  624         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
  625         int cflag, hflag, jflag, tflag, zflag;
  626         int dwidth, upper;
  627         char padc;
  628         int stop = 0, retval = 0;
  629 
  630         num = 0;
  631         if (!func)
  632                 d = (char *) arg;
  633         else
  634                 d = NULL;
  635 
  636         if (fmt == NULL)
  637                 fmt = "(fmt null)\n";
  638 
  639         if (radix < 2 || radix > 36)
  640                 radix = 10;
  641 
  642         for (;;) {
  643                 padc = ' ';
  644                 width = 0;
  645                 while ((ch = (u_char)*fmt++) != '%' || stop) {
  646                         if (ch == '\0')
  647                                 return (retval);
  648                         PCHAR(ch);
  649                 }
  650                 percent = fmt - 1;
  651                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
  652                 sign = 0; dot = 0; dwidth = 0; upper = 0;
  653                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
  654 reswitch:       switch (ch = (u_char)*fmt++) {
  655                 case '.':
  656                         dot = 1;
  657                         goto reswitch;
  658                 case '#':
  659                         sharpflag = 1;
  660                         goto reswitch;
  661                 case '+':
  662                         sign = 1;
  663                         goto reswitch;
  664                 case '-':
  665                         ladjust = 1;
  666                         goto reswitch;
  667                 case '%':
  668                         PCHAR(ch);
  669                         break;
  670                 case '*':
  671                         if (!dot) {
  672                                 width = va_arg(ap, int);
  673                                 if (width < 0) {
  674                                         ladjust = !ladjust;
  675                                         width = -width;
  676                                 }
  677                         } else {
  678                                 dwidth = va_arg(ap, int);
  679                         }
  680                         goto reswitch;
  681                 case '':
  682                         if (!dot) {
  683                                 padc = '';
  684                                 goto reswitch;
  685                         }
  686                 case '1': case '2': case '3': case '4':
  687                 case '5': case '6': case '7': case '8': case '9':
  688                                 for (n = 0;; ++fmt) {
  689                                         n = n * 10 + ch - '';
  690                                         ch = *fmt;
  691                                         if (ch < '' || ch > '9')
  692                                                 break;
  693                                 }
  694                         if (dot)
  695                                 dwidth = n;
  696                         else
  697                                 width = n;
  698                         goto reswitch;
  699                 case 'b':
  700                         num = (u_int)va_arg(ap, int);
  701                         p = va_arg(ap, char *);
  702                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
  703                                 PCHAR(*q--);
  704 
  705                         if (num == 0)
  706                                 break;
  707 
  708                         for (tmp = 0; *p;) {
  709                                 n = *p++;
  710                                 if (num & (1 << (n - 1))) {
  711                                         PCHAR(tmp ? ',' : '<');
  712                                         for (; (n = *p) > ' '; ++p)
  713                                                 PCHAR(n);
  714                                         tmp = 1;
  715                                 } else
  716                                         for (; *p > ' '; ++p)
  717                                                 continue;
  718                         }
  719                         if (tmp)
  720                                 PCHAR('>');
  721                         break;
  722                 case 'c':
  723                         PCHAR(va_arg(ap, int));
  724                         break;
  725                 case 'D':
  726                         up = va_arg(ap, u_char *);
  727                         p = va_arg(ap, char *);
  728                         if (!width)
  729                                 width = 16;
  730                         while(width--) {
  731                                 PCHAR(hex2ascii(*up >> 4));
  732                                 PCHAR(hex2ascii(*up & 0x0f));
  733                                 up++;
  734                                 if (width)
  735                                         for (q=p;*q;q++)
  736                                                 PCHAR(*q);
  737                         }
  738                         break;
  739                 case 'd':
  740                 case 'i':
  741                         base = 10;
  742                         sign = 1;
  743                         goto handle_sign;
  744                 case 'h':
  745                         if (hflag) {
  746                                 hflag = 0;
  747                                 cflag = 1;
  748                         } else
  749                                 hflag = 1;
  750                         goto reswitch;
  751                 case 'j':
  752                         jflag = 1;
  753                         goto reswitch;
  754                 case 'l':
  755                         if (lflag) {
  756                                 lflag = 0;
  757                                 qflag = 1;
  758                         } else
  759                                 lflag = 1;
  760                         goto reswitch;
  761                 case 'n':
  762                         if (jflag)
  763                                 *(va_arg(ap, intmax_t *)) = retval;
  764                         else if (qflag)
  765                                 *(va_arg(ap, quad_t *)) = retval;
  766                         else if (lflag)
  767                                 *(va_arg(ap, long *)) = retval;
  768                         else if (zflag)
  769                                 *(va_arg(ap, size_t *)) = retval;
  770                         else if (hflag)
  771                                 *(va_arg(ap, short *)) = retval;
  772                         else if (cflag)
  773                                 *(va_arg(ap, char *)) = retval;
  774                         else
  775                                 *(va_arg(ap, int *)) = retval;
  776                         break;
  777                 case 'o':
  778                         base = 8;
  779                         goto handle_nosign;
  780                 case 'p':
  781                         base = 16;
  782                         sharpflag = (width == 0);
  783                         sign = 0;
  784                         num = (uintptr_t)va_arg(ap, void *);
  785                         goto number;
  786                 case 'q':
  787                         qflag = 1;
  788                         goto reswitch;
  789                 case 'r':
  790                         base = radix;
  791                         if (sign)
  792                                 goto handle_sign;
  793                         goto handle_nosign;
  794                 case 's':
  795                         p = va_arg(ap, char *);
  796                         if (p == NULL)
  797                                 p = "(null)";
  798                         if (!dot)
  799                                 n = strlen (p);
  800                         else
  801                                 for (n = 0; n < dwidth && p[n]; n++)
  802                                         continue;
  803 
  804                         width -= n;
  805 
  806                         if (!ladjust && width > 0)
  807                                 while (width--)
  808                                         PCHAR(padc);
  809                         while (n--)
  810                                 PCHAR(*p++);
  811                         if (ladjust && width > 0)
  812                                 while (width--)
  813                                         PCHAR(padc);
  814                         break;
  815                 case 't':
  816                         tflag = 1;
  817                         goto reswitch;
  818                 case 'u':
  819                         base = 10;
  820                         goto handle_nosign;
  821                 case 'X':
  822                         upper = 1;
  823                 case 'x':
  824                         base = 16;
  825                         goto handle_nosign;
  826                 case 'y':
  827                         base = 16;
  828                         sign = 1;
  829                         goto handle_sign;
  830                 case 'z':
  831                         zflag = 1;
  832                         goto reswitch;
  833 handle_nosign:
  834                         sign = 0;
  835                         if (jflag)
  836                                 num = va_arg(ap, uintmax_t);
  837                         else if (qflag)
  838                                 num = va_arg(ap, u_quad_t);
  839                         else if (tflag)
  840                                 num = va_arg(ap, ptrdiff_t);
  841                         else if (lflag)
  842                                 num = va_arg(ap, u_long);
  843                         else if (zflag)
  844                                 num = va_arg(ap, size_t);
  845                         else if (hflag)
  846                                 num = (u_short)va_arg(ap, int);
  847                         else if (cflag)
  848                                 num = (u_char)va_arg(ap, int);
  849                         else
  850                                 num = va_arg(ap, u_int);
  851                         goto number;
  852 handle_sign:
  853                         if (jflag)
  854                                 num = va_arg(ap, intmax_t);
  855                         else if (qflag)
  856                                 num = va_arg(ap, quad_t);
  857                         else if (tflag)
  858                                 num = va_arg(ap, ptrdiff_t);
  859                         else if (lflag)
  860                                 num = va_arg(ap, long);
  861                         else if (zflag)
  862                                 num = va_arg(ap, ssize_t);
  863                         else if (hflag)
  864                                 num = (short)va_arg(ap, int);
  865                         else if (cflag)
  866                                 num = (char)va_arg(ap, int);
  867                         else
  868                                 num = va_arg(ap, int);
  869 number:
  870                         if (sign && (intmax_t)num < 0) {
  871                                 neg = 1;
  872                                 num = -(intmax_t)num;
  873                         }
  874                         p = ksprintn(nbuf, num, base, &n, upper);
  875                         tmp = 0;
  876                         if (sharpflag && num != 0) {
  877                                 if (base == 8)
  878                                         tmp++;
  879                                 else if (base == 16)
  880                                         tmp += 2;
  881                         }
  882                         if (neg)
  883                                 tmp++;
  884 
  885                         if (!ladjust && padc == '')
  886                                 dwidth = width - tmp;
  887                         width -= tmp + imax(dwidth, n);
  888                         dwidth -= n;
  889                         if (!ladjust)
  890                                 while (width-- > 0)
  891                                         PCHAR(' ');
  892                         if (neg)
  893                                 PCHAR('-');
  894                         if (sharpflag && num != 0) {
  895                                 if (base == 8) {
  896                                         PCHAR('');
  897                                 } else if (base == 16) {
  898                                         PCHAR('');
  899                                         PCHAR('x');
  900                                 }
  901                         }
  902                         while (dwidth-- > 0)
  903                                 PCHAR('');
  904 
  905                         while (*p)
  906                                 PCHAR(*p--);
  907 
  908                         if (ladjust)
  909                                 while (width-- > 0)
  910                                         PCHAR(' ');
  911 
  912                         break;
  913                 default:
  914                         while (percent < fmt)
  915                                 PCHAR(*percent++);
  916                         /*
  917                          * Since we ignore a formatting argument it is no 
  918                          * longer safe to obey the remaining formatting
  919                          * arguments as the arguments will no longer match
  920                          * the format specs.
  921                          */
  922                         stop = 1;
  923                         break;
  924                 }
  925         }
  926 #undef PCHAR
  927 }
  928 
  929 /*
  930  * Put character in log buffer with a particular priority.
  931  */
  932 static void
  933 msglogchar(int c, int pri)
  934 {
  935         static int lastpri = -1;
  936         static int dangling;
  937         char nbuf[MAXNBUF];
  938         char *p;
  939 
  940         if (!msgbufmapped)
  941                 return;
  942         if (c == '\0' || c == '\r')
  943                 return;
  944         if (pri != -1 && pri != lastpri) {
  945                 if (dangling) {
  946                         msgbuf_addchar(msgbufp, '\n');
  947                         dangling = 0;
  948                 }
  949                 msgbuf_addchar(msgbufp, '<');
  950                 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
  951                         msgbuf_addchar(msgbufp, *p--);
  952                 msgbuf_addchar(msgbufp, '>');
  953                 lastpri = pri;
  954         }
  955         msgbuf_addchar(msgbufp, c);
  956         if (c == '\n') {
  957                 dangling = 0;
  958                 lastpri = -1;
  959         } else {
  960                 dangling = 1;
  961         }
  962 }
  963 
  964 static void
  965 msglogstr(char *str, int pri, int filter_cr)
  966 {
  967         if (!msgbufmapped)
  968                 return;
  969 
  970         msgbuf_addstr(msgbufp, pri, str, filter_cr);
  971 }
  972 
  973 void
  974 msgbufinit(void *ptr, int size)
  975 {
  976         char *cp;
  977         static struct msgbuf *oldp = NULL;
  978 
  979         size -= sizeof(*msgbufp);
  980         cp = (char *)ptr;
  981         msgbufp = (struct msgbuf *)(cp + size);
  982         msgbuf_reinit(msgbufp, cp, size);
  983         if (msgbufmapped && oldp != msgbufp)
  984                 msgbuf_copy(oldp, msgbufp);
  985         msgbufmapped = 1;
  986         oldp = msgbufp;
  987 }
  988 
  989 static int unprivileged_read_msgbuf = 1;
  990 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
  991     CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
  992     "Unprivileged processes may read the kernel message buffer");
  993 
  994 /* Sysctls for accessing/clearing the msgbuf */
  995 static int
  996 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
  997 {
  998         char buf[128];
  999         u_int seq;
 1000         int error, len;
 1001 
 1002         if (!unprivileged_read_msgbuf) {
 1003                 error = priv_check(req->td, PRIV_MSGBUF);
 1004                 if (error)
 1005                         return (error);
 1006         }
 1007 
 1008         /* Read the whole buffer, one chunk at a time. */
 1009         mtx_lock(&msgbuf_lock);
 1010         msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
 1011         for (;;) {
 1012                 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
 1013                 mtx_unlock(&msgbuf_lock);
 1014                 if (len == 0)
 1015                         return (0);
 1016 
 1017                 error = sysctl_handle_opaque(oidp, buf, len, req);
 1018                 if (error)
 1019                         return (error);
 1020 
 1021                 mtx_lock(&msgbuf_lock);
 1022         }
 1023 }
 1024 
 1025 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
 1026     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
 1027     NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
 1028 
 1029 static int msgbuf_clearflag;
 1030 
 1031 static int
 1032 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
 1033 {
 1034         int error;
 1035         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 1036         if (!error && req->newptr) {
 1037                 mtx_lock(&msgbuf_lock);
 1038                 msgbuf_clear(msgbufp);
 1039                 mtx_unlock(&msgbuf_lock);
 1040                 msgbuf_clearflag = 0;
 1041         }
 1042         return (error);
 1043 }
 1044 
 1045 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
 1046     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
 1047     &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
 1048     "Clear kernel message buffer");
 1049 
 1050 #ifdef DDB
 1051 
 1052 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
 1053 {
 1054         int i, j;
 1055 
 1056         if (!msgbufmapped) {
 1057                 db_printf("msgbuf not mapped yet\n");
 1058                 return;
 1059         }
 1060         db_printf("msgbufp = %p\n", msgbufp);
 1061         db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
 1062             msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
 1063             msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
 1064         for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
 1065                 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
 1066                 db_printf("%c", msgbufp->msg_ptr[j]);
 1067         }
 1068         db_printf("\n");
 1069 }
 1070 
 1071 #endif /* DDB */
 1072 
 1073 void
 1074 hexdump(const void *ptr, int length, const char *hdr, int flags)
 1075 {
 1076         int i, j, k;
 1077         int cols;
 1078         const unsigned char *cp;
 1079         char delim;
 1080 
 1081         if ((flags & HD_DELIM_MASK) != 0)
 1082                 delim = (flags & HD_DELIM_MASK) >> 8;
 1083         else
 1084                 delim = ' ';
 1085 
 1086         if ((flags & HD_COLUMN_MASK) != 0)
 1087                 cols = flags & HD_COLUMN_MASK;
 1088         else
 1089                 cols = 16;
 1090 
 1091         cp = ptr;
 1092         for (i = 0; i < length; i+= cols) {
 1093                 if (hdr != NULL)
 1094                         printf("%s", hdr);
 1095 
 1096                 if ((flags & HD_OMIT_COUNT) == 0)
 1097                         printf("%04x  ", i);
 1098 
 1099                 if ((flags & HD_OMIT_HEX) == 0) {
 1100                         for (j = 0; j < cols; j++) {
 1101                                 k = i + j;
 1102                                 if (k < length)
 1103                                         printf("%c%02x", delim, cp[k]);
 1104                                 else
 1105                                         printf("   ");
 1106                         }
 1107                 }
 1108 
 1109                 if ((flags & HD_OMIT_CHARS) == 0) {
 1110                         printf("  |");
 1111                         for (j = 0; j < cols; j++) {
 1112                                 k = i + j;
 1113                                 if (k >= length)
 1114                                         printf(" ");
 1115                                 else if (cp[k] >= ' ' && cp[k] <= '~')
 1116                                         printf("%c", cp[k]);
 1117                                 else
 1118                                         printf(".");
 1119                         }
 1120                         printf("|");
 1121                 }
 1122                 printf("\n");
 1123         }
 1124 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_prf.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c
