Now available: 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 39 * $FreeBSD$ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/msgbuf.h> 46 #include <sys/malloc.h> 47 #include <sys/proc.h> 48 #include <sys/tty.h> 49 #include <sys/tprintf.h> 50 #include <sys/syslog.h> 51 #include <sys/cons.h> 52 #include <sys/uio.h> 53 #include <sys/sysctl.h> 54 55 /* 56 * Note that stdarg.h and the ANSI style va_start macro is used for both 57 * ANSI and traditional C compilers. 58 */ 59 #include <machine/stdarg.h> 60 61 #define TOCONS 0x01 62 #define TOTTY 0x02 63 #define TOLOG 0x04 64 65 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 66 #define MAXNBUF (sizeof(quad_t) * NBBY + 1) 67 68 struct putchar_arg { 69 int flags; 70 int pri; 71 struct tty *tty; 72 }; 73 74 struct snprintf_arg { 75 char *str; 76 size_t remain; 77 }; 78 79 extern int log_open; 80 81 struct tty *constty; /* pointer to console "window" tty */ 82 83 static void (*v_putc)(int) = cnputc; /* routine to putc on virtual console */ 84 static void msglogchar(int c, int pri); 85 static void msgaddchar(int c, void *dummy); 86 static void putchar __P((int ch, void *arg)); 87 static char *ksprintn __P((char *nbuf, u_long num, int base, int *len)); 88 static char *ksprintqn __P((char *nbuf, u_quad_t num, int base, int *len)); 89 static void snprintf_func __P((int ch, void *arg)); 90 91 static int consintr = 1; /* Ok to handle console interrupts? */ 92 static int msgbufmapped; /* Set when safe to use msgbuf */ 93 int msgbuftrigger; 94 95 static int log_console_output = 1; 96 TUNABLE_INT("kern.log_console_output", &log_console_output); 97 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 98 &log_console_output, 0, ""); 99 100 /* 101 * Warn that a system table is full. 102 */ 103 void 104 tablefull(const char *tab) 105 { 106 107 log(LOG_ERR, "%s: table is full\n", tab); 108 } 109 110 /* 111 * Uprintf prints to the controlling terminal for the current process. 112 * It may block if the tty queue is overfull. No message is printed if 113 * the queue does not clear in a reasonable time. 114 */ 115 int 116 uprintf(const char *fmt, ...) 117 { 118 struct proc *p = curproc; 119 va_list ap; 120 struct putchar_arg pca; 121 int retval = 0; 122 123 if (p && p->p_flag & P_CONTROLT && 124 p->p_session->s_ttyvp) { 125 va_start(ap, fmt); 126 pca.tty = p->p_session->s_ttyp; 127 pca.flags = TOTTY; 128 retval = kvprintf(fmt, putchar, &pca, 10, ap); 129 va_end(ap); 130 } 131 return retval; 132 } 133 134 tpr_t 135 tprintf_open(p) 136 register struct proc *p; 137 { 138 139 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 140 SESSHOLD(p->p_session); 141 return ((tpr_t) p->p_session); 142 } 143 return ((tpr_t) NULL); 144 } 145 146 void 147 tprintf_close(sess) 148 tpr_t sess; 149 { 150 151 if (sess) 152 SESSRELE((struct session *) sess); 153 } 154 155 /* 156 * tprintf prints on the controlling terminal associated 157 * with the given session. 158 */ 159 int 160 tprintf(tpr_t tpr, const char *fmt, ...) 161 { 162 register struct session *sess = (struct session *)tpr; 163 struct tty *tp = NULL; 164 int flags = TOLOG; 165 va_list ap; 166 struct putchar_arg pca; 167 int retval; 168 169 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 170 flags |= TOTTY; 171 tp = sess->s_ttyp; 172 } 173 va_start(ap, fmt); 174 pca.tty = tp; 175 pca.flags = flags; 176 pca.pri = LOG_INFO; 177 retval = kvprintf(fmt, putchar, &pca, 10, ap); 178 va_end(ap); 179 msgbuftrigger = 1; 180 return retval; 181 } 182 183 /* 184 * Ttyprintf displays a message on a tty; it should be used only by 185 * the tty driver, or anything that knows the underlying tty will not 186 * be revoke(2)'d away. Other callers should use tprintf. 187 */ 188 int 189 ttyprintf(struct tty *tp, const char *fmt, ...) 190 { 191 va_list ap; 192 struct putchar_arg pca; 193 int retval; 194 195 va_start(ap, fmt); 196 pca.tty = tp; 197 pca.flags = TOTTY; 198 retval = kvprintf(fmt, putchar, &pca, 10, ap); 199 va_end(ap); 200 return retval; 201 } 202 203 /* 204 * Log writes to the log buffer, and guarantees not to sleep (so can be 205 * called by interrupt routines). If there is no process reading the 206 * log yet, it writes to the console also. 207 */ 208 int 209 log(int level, const char *fmt, ...) 210 { 211 va_list ap; 212 int retval; 213 struct putchar_arg pca; 214 215 pca.tty = NULL; 216 pca.pri = level; 217 pca.flags = log_open ? TOLOG : TOCONS; 218 219 va_start(ap, fmt); 220 retval = kvprintf(fmt, putchar, &pca, 10, ap); 221 va_end(ap); 222 223 msgbuftrigger = 1; 224 return (retval); 225 } 226 227 int 228 addlog(const char *fmt, ...) 229 { 230 va_list ap; 231 int retval; 232 struct putchar_arg pca; 233 234 pca.tty = NULL; 235 pca.pri = -1; 236 pca.flags = log_open ? TOLOG : TOCONS; 237 238 va_start(ap, fmt); 239 retval = kvprintf(fmt, putchar, &pca, 10, ap); 240 va_end(ap); 241 242 msgbuftrigger = 1; 243 return (retval); 244 } 245 246 #define CONSCHUNK 128 247 248 void 249 log_console(struct uio *uio) 250 { 251 int c, i, error, iovlen, nl; 252 struct uio muio; 253 struct iovec *miov = NULL; 254 char *consbuffer; 255 int pri; 256 257 if (!log_console_output) 258 return; 259 260 pri = LOG_INFO | LOG_CONSOLE; 261 muio = *uio; 262 iovlen = uio->uio_iovcnt * sizeof (struct iovec); 263 MALLOC(miov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 264 MALLOC(consbuffer, char *, CONSCHUNK, M_TEMP, M_WAITOK); 265 bcopy((caddr_t)muio.uio_iov, (caddr_t)miov, iovlen); 266 muio.uio_iov = miov; 267 uio = &muio; 268 269 nl = 0; 270 while (uio->uio_resid > 0) { 271 c = imin(uio->uio_resid, CONSCHUNK); 272 error = uiomove(consbuffer, c, uio); 273 if (error != 0) 274 return; 275 for (i = 0; i < c; i++) { 276 msglogchar(consbuffer[i], pri); 277 if (consbuffer[i] == '\n') 278 nl = 1; 279 else 280 nl = 0; 281 } 282 } 283 if (!nl) 284 msglogchar('\n', pri); 285 msgbuftrigger = 1; 286 FREE(miov, M_TEMP); 287 FREE(consbuffer, M_TEMP); 288 return; 289 } 290 291 int 292 printf(const char *fmt, ...) 293 { 294 va_list ap; 295 int savintr; 296 struct putchar_arg pca; 297 int retval; 298 299 savintr = consintr; /* disable interrupts */ 300 consintr = 0; 301 va_start(ap, fmt); 302 pca.tty = NULL; 303 pca.flags = TOCONS | TOLOG; 304 pca.pri = -1; 305 retval = kvprintf(fmt, putchar, &pca, 10, ap); 306 va_end(ap); 307 if (!panicstr) 308 msgbuftrigger = 1; 309 consintr = savintr; /* reenable interrupts */ 310 return retval; 311 } 312 313 int 314 vprintf(const char *fmt, va_list ap) 315 { 316 int savintr; 317 struct putchar_arg pca; 318 int retval; 319 320 savintr = consintr; /* disable interrupts */ 321 consintr = 0; 322 pca.tty = NULL; 323 pca.flags = TOCONS | TOLOG; 324 pca.pri = -1; 325 retval = kvprintf(fmt, putchar, &pca, 10, ap); 326 if (!panicstr) 327 msgbuftrigger = 1; 328 consintr = savintr; /* reenable interrupts */ 329 return retval; 330 } 331 332 /* 333 * Print a character on console or users terminal. If destination is 334 * the console then the last bunch of characters are saved in msgbuf for 335 * inspection later. 336 */ 337 static void 338 putchar(int c, void *arg) 339 { 340 struct putchar_arg *ap = (struct putchar_arg*) arg; 341 int flags = ap->flags; 342 struct tty *tp = ap->tty; 343 if (panicstr) 344 constty = NULL; 345 if ((flags & TOCONS) && tp == NULL && constty) { 346 tp = constty; 347 flags |= TOTTY; 348 } 349 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 350 (flags & TOCONS) && tp == constty) 351 constty = NULL; 352 if ((flags & TOLOG)) 353 msglogchar(c, ap->pri); 354 if ((flags & TOCONS) && constty == NULL && c != '\0') 355 (*v_putc)(c); 356 } 357 358 /* 359 * Scaled down version of sprintf(3). 360 */ 361 int 362 sprintf(char *buf, const char *cfmt, ...) 363 { 364 int retval; 365 va_list ap; 366 367 va_start(ap, cfmt); 368 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 369 buf[retval] = '\0'; 370 va_end(ap); 371 return retval; 372 } 373 374 /* 375 * Scaled down version of vsprintf(3). 376 */ 377 int 378 vsprintf(char *buf, const char *cfmt, va_list ap) 379 { 380 int retval; 381 382 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 383 buf[retval] = '\0'; 384 return retval; 385 } 386 387 /* 388 * Scaled down version of snprintf(3). 389 */ 390 int 391 snprintf(char *str, size_t size, const char *format, ...) 392 { 393 int retval; 394 va_list ap; 395 396 va_start(ap, format); 397 retval = vsnprintf(str, size, format, ap); 398 va_end(ap); 399 return(retval); 400 } 401 402 /* 403 * Scaled down version of vsnprintf(3). 404 */ 405 int 406 vsnprintf(char *str, size_t size, const char *format, va_list ap) 407 { 408 struct snprintf_arg info; 409 int retval; 410 411 info.str = str; 412 info.remain = size; 413 retval = kvprintf(format, snprintf_func, &info, 10, ap); 414 if (info.remain >= 1) 415 *info.str++ = '\0'; 416 return retval; 417 } 418 419 static void 420 snprintf_func(int ch, void *arg) 421 { 422 struct snprintf_arg *const info = arg; 423 424 if (info->remain >= 2) { 425 *info->str++ = ch; 426 info->remain--; 427 } 428 } 429 430 /* 431 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 432 * order; return an optional length and a pointer to the last character 433 * written in the buffer (i.e., the first character of the string). 434 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 435 */ 436 static char * 437 ksprintn(nbuf, ul, base, lenp) 438 char *nbuf; 439 u_long ul; 440 int base, *lenp; 441 { 442 char *p; 443 444 p = nbuf; 445 *p = '\0'; 446 do { 447 *++p = hex2ascii(ul % base); 448 } while (ul /= base); 449 if (lenp) 450 *lenp = p - nbuf; 451 return (p); 452 } 453 /* ksprintn, but for a quad_t. */ 454 static char * 455 ksprintqn(nbuf, uq, base, lenp) 456 char *nbuf; 457 u_quad_t uq; 458 int base, *lenp; 459 { 460 char *p; 461 462 p = nbuf; 463 *p = '\0'; 464 do { 465 *++p = hex2ascii(uq % base); 466 } while (uq /= base); 467 if (lenp) 468 *lenp = p - nbuf; 469 return (p); 470 } 471 472 /* 473 * Scaled down version of printf(3). 474 * 475 * Two additional formats: 476 * 477 * The format %b is supported to decode error registers. 478 * Its usage is: 479 * 480 * printf("reg=%b\n", regval, "<base><arg>*"); 481 * 482 * where <base> is the output base expressed as a control character, e.g. 483 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 484 * the first of which gives the bit number to be inspected (origin 1), and 485 * the next characters (up to a control character, i.e. a character <= 32), 486 * give the name of the register. Thus: 487 * 488 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n"); 489 * 490 * would produce output: 491 * 492 * reg=3<BITTWO,BITONE> 493 * 494 * XXX: %D -- Hexdump, takes pointer and separator string: 495 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 496 * ("%*D", len, ptr, " " -> XX XX XX XX ... 497 */ 498 int 499 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 500 { 501 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 502 char nbuf[MAXNBUF]; 503 char *p, *q, *d; 504 u_char *up; 505 int ch, n; 506 u_long ul; 507 u_quad_t uq; 508 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 509 int dwidth; 510 char padc; 511 int retval = 0; 512 513 ul = 0; 514 uq = 0; 515 if (!func) 516 d = (char *) arg; 517 else 518 d = NULL; 519 520 if (fmt == NULL) 521 fmt = "(fmt null)\n"; 522 523 if (radix < 2 || radix > 36) 524 radix = 10; 525 526 for (;;) { 527 padc = ' '; 528 width = 0; 529 while ((ch = (u_char)*fmt++) != '%') { 530 if (ch == '\0') 531 return retval; 532 PCHAR(ch); 533 } 534 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 535 sign = 0; dot = 0; dwidth = 0; 536 reswitch: switch (ch = (u_char)*fmt++) { 537 case '.': 538 dot = 1; 539 goto reswitch; 540 case '#': 541 sharpflag = 1; 542 goto reswitch; 543 case '+': 544 sign = 1; 545 goto reswitch; 546 case '-': 547 ladjust = 1; 548 goto reswitch; 549 case '%': 550 PCHAR(ch); 551 break; 552 case '*': 553 if (!dot) { 554 width = va_arg(ap, int); 555 if (width < 0) { 556 ladjust = !ladjust; 557 width = -width; 558 } 559 } else { 560 dwidth = va_arg(ap, int); 561 } 562 goto reswitch; 563 case '': 564 if (!dot) { 565 padc = ''; 566 goto reswitch; 567 } 568 case '1': case '2': case '3': case '4': 569 case '5': case '6': case '7': case '8': case '9': 570 for (n = 0;; ++fmt) { 571 n = n * 10 + ch - ''; 572 ch = *fmt; 573 if (ch < '' || ch > '9') 574 break; 575 } 576 if (dot) 577 dwidth = n; 578 else 579 width = n; 580 goto reswitch; 581 case 'b': 582 ul = va_arg(ap, int); 583 p = va_arg(ap, char *); 584 for (q = ksprintn(nbuf, ul, *p++, NULL); *q;) 585 PCHAR(*q--); 586 587 if (!ul) 588 break; 589 590 for (tmp = 0; *p;) { 591 n = *p++; 592 if (ul & (1 << (n - 1))) { 593 PCHAR(tmp ? ',' : '<'); 594 for (; (n = *p) > ' '; ++p) 595 PCHAR(n); 596 tmp = 1; 597 } else 598 for (; *p > ' '; ++p) 599 continue; 600 } 601 if (tmp) 602 PCHAR('>'); 603 break; 604 case 'c': 605 PCHAR(va_arg(ap, int)); 606 break; 607 case 'D': 608 up = va_arg(ap, u_char *); 609 p = va_arg(ap, char *); 610 if (!width) 611 width = 16; 612 while(width--) { 613 PCHAR(hex2ascii(*up >> 4)); 614 PCHAR(hex2ascii(*up & 0x0f)); 615 up++; 616 if (width) 617 for (q=p;*q;q++) 618 PCHAR(*q); 619 } 620 break; 621 case 'd': 622 if (qflag) 623 uq = va_arg(ap, quad_t); 624 else if (lflag) 625 ul = va_arg(ap, long); 626 else 627 ul = va_arg(ap, int); 628 sign = 1; 629 base = 10; 630 goto number; 631 case 'l': 632 if (lflag) { 633 lflag = 0; 634 qflag = 1; 635 } else 636 lflag = 1; 637 goto reswitch; 638 case 'o': 639 if (qflag) 640 uq = va_arg(ap, u_quad_t); 641 else if (lflag) 642 ul = va_arg(ap, u_long); 643 else 644 ul = va_arg(ap, u_int); 645 base = 8; 646 goto nosign; 647 case 'p': 648 ul = (uintptr_t)va_arg(ap, void *); 649 base = 16; 650 sharpflag = (width == 0); 651 goto nosign; 652 case 'q': 653 qflag = 1; 654 goto reswitch; 655 case 'n': 656 case 'r': 657 if (qflag) 658 uq = va_arg(ap, u_quad_t); 659 else if (lflag) 660 ul = va_arg(ap, u_long); 661 else 662 ul = sign ? 663 (u_long)va_arg(ap, int) : va_arg(ap, u_int); 664 base = radix; 665 goto number; 666 case 's': 667 p = va_arg(ap, char *); 668 if (p == NULL) 669 p = "(null)"; 670 if (!dot) 671 n = strlen (p); 672 else 673 for (n = 0; n < dwidth && p[n]; n++) 674 continue; 675 676 width -= n; 677 678 if (!ladjust && width > 0) 679 while (width--) 680 PCHAR(padc); 681 while (n--) 682 PCHAR(*p++); 683 if (ladjust && width > 0) 684 while (width--) 685 PCHAR(padc); 686 break; 687 case 'u': 688 if (qflag) 689 uq = va_arg(ap, u_quad_t); 690 else if (lflag) 691 ul = va_arg(ap, u_long); 692 else 693 ul = va_arg(ap, u_int); 694 base = 10; 695 goto nosign; 696 case 'x': 697 case 'X': 698 if (qflag) 699 uq = va_arg(ap, u_quad_t); 700 else if (lflag) 701 ul = va_arg(ap, u_long); 702 else 703 ul = va_arg(ap, u_int); 704 base = 16; 705 goto nosign; 706 case 'z': 707 if (qflag) 708 uq = va_arg(ap, u_quad_t); 709 else if (lflag) 710 ul = va_arg(ap, u_long); 711 else 712 ul = sign ? 713 (u_long)va_arg(ap, int) : va_arg(ap, u_int); 714 base = 16; 715 goto number; 716 nosign: sign = 0; 717 number: 718 if (qflag) { 719 if (sign && (quad_t)uq < 0) { 720 neg = 1; 721 uq = -(quad_t)uq; 722 } 723 p = ksprintqn(nbuf, uq, base, &tmp); 724 } else { 725 if (sign && (long)ul < 0) { 726 neg = 1; 727 ul = -(long)ul; 728 } 729 p = ksprintn(nbuf, ul, base, &tmp); 730 } 731 if (sharpflag && (qflag ? uq != 0 : ul != 0)) { 732 if (base == 8) 733 tmp++; 734 else if (base == 16) 735 tmp += 2; 736 } 737 if (neg) 738 tmp++; 739 740 if (!ladjust && width && (width -= tmp) > 0) 741 while (width--) 742 PCHAR(padc); 743 if (neg) 744 PCHAR('-'); 745 if (sharpflag && (qflag ? uq != 0 : ul != 0)) { 746 if (base == 8) { 747 PCHAR(''); 748 } else if (base == 16) { 749 PCHAR(''); 750 PCHAR('x'); 751 } 752 } 753 754 while (*p) 755 PCHAR(*p--); 756 757 if (ladjust && width && (width -= tmp) > 0) 758 while (width--) 759 PCHAR(padc); 760 761 break; 762 default: 763 PCHAR('%'); 764 if (lflag) 765 PCHAR('l'); 766 PCHAR(ch); 767 break; 768 } 769 } 770 #undef PCHAR 771 } 772 773 /* 774 * Put character in log buffer with a particular priority. 775 */ 776 static void 777 msglogchar(int c, int pri) 778 { 779 static int lastpri = -1; 780 static int dangling; 781 char nbuf[MAXNBUF]; 782 char *p; 783 784 if (!msgbufmapped) 785 return; 786 if (c == '\0' || c == '\r') 787 return; 788 if (pri != -1 && pri != lastpri) { 789 if (dangling) { 790 msgaddchar('\n', NULL); 791 dangling = 0; 792 } 793 msgaddchar('<', NULL); 794 for (p = ksprintn(nbuf, (u_long)pri, 10, NULL); *p;) 795 msgaddchar(*p--, NULL); 796 msgaddchar('>', NULL); 797 lastpri = pri; 798 } 799 msgaddchar(c, NULL); 800 if (c == '\n') { 801 dangling = 0; 802 lastpri = -1; 803 } else { 804 dangling = 1; 805 } 806 } 807 808 /* 809 * Put char in log buffer 810 */ 811 static void 812 msgaddchar(int c, void *dummy) 813 { 814 struct msgbuf *mbp; 815 816 if (!msgbufmapped) 817 return; 818 mbp = msgbufp; 819 mbp->msg_ptr[mbp->msg_bufx++] = c; 820 if (mbp->msg_bufx >= mbp->msg_size) 821 mbp->msg_bufx = 0; 822 /* If the buffer is full, keep the most recent data. */ 823 if (mbp->msg_bufr == mbp->msg_bufx) { 824 if (++mbp->msg_bufr >= mbp->msg_size) 825 mbp->msg_bufr = 0; 826 } 827 } 828 829 static void 830 msgbufcopy(struct msgbuf *oldp) 831 { 832 int pos; 833 834 pos = oldp->msg_bufr; 835 while (pos != oldp->msg_bufx) { 836 msglogchar(oldp->msg_ptr[pos], -1); 837 if (++pos >= oldp->msg_size) 838 pos = 0; 839 } 840 } 841 842 void 843 msgbufinit(void *ptr, size_t size) 844 { 845 char *cp; 846 static struct msgbuf *oldp = NULL; 847 848 size -= sizeof(*msgbufp); 849 cp = (char *)ptr; 850 msgbufp = (struct msgbuf *) (cp + size); 851 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size || 852 msgbufp->msg_bufx >= size || msgbufp->msg_bufr >= size) { 853 bzero(cp, size); 854 bzero(msgbufp, sizeof(*msgbufp)); 855 msgbufp->msg_magic = MSG_MAGIC; 856 msgbufp->msg_size = (char *)msgbufp - cp; 857 } 858 msgbufp->msg_ptr = cp; 859 if (msgbufmapped && oldp != msgbufp) 860 msgbufcopy(oldp); 861 msgbufmapped = 1; 862 oldp = msgbufp; 863 } 864 865 /* Sysctls for accessing/clearing the msgbuf */ 866 static int 867 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 868 { 869 int error; 870 871 /* 872 * Unwind the buffer, so that it's linear (possibly starting with 873 * some initial nulls). 874 */ 875 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr + msgbufp->msg_bufx, 876 msgbufp->msg_size - msgbufp->msg_bufx, req); 877 if (error) 878 return (error); 879 if (msgbufp->msg_bufx > 0) { 880 error = sysctl_handle_opaque(oidp, msgbufp->msg_ptr, 881 msgbufp->msg_bufx, req); 882 } 883 return (error); 884 } 885 886 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 887 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 888 889 static int msgbuf_clear; 890 891 static int 892 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 893 { 894 int error; 895 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 896 if (!error && req->newptr) { 897 /* Clear the buffer and reset write pointer */ 898 bzero(msgbufp->msg_ptr, msgbufp->msg_size); 899 msgbufp->msg_bufr = msgbufp->msg_bufx = 0; 900 msgbuf_clear = 0; 901 } 902 return (error); 903 } 904 905 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 906 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clear, 0, 907 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 908 909 #include "opt_ddb.h" 910 #ifdef DDB 911 #include <ddb/ddb.h> 912 913 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 914 { 915 int i, j; 916 917 if (!msgbufmapped) { 918 db_printf("msgbuf not mapped yet\n"); 919 return; 920 } 921 db_printf("msgbufp = %p\n", msgbufp); 922 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", 923 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr, 924 msgbufp->msg_bufx, msgbufp->msg_ptr); 925 for (i = 0; i < msgbufp->msg_size; i++) { 926 j = (i + msgbufp->msg_bufr) % msgbufp->msg_size; 927 db_printf("%c", msgbufp->msg_ptr[j]); 928 } 929 db_printf("\n"); 930 } 931 932 #endif /* DDB */
Cache object: 6c8598cd0aab690099654a0138ddca44
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