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