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 #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 putchar(int ch, void *arg); 98 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper); 99 static void snprintf_func(int ch, void *arg); 100 101 static int msgbufmapped; /* Set when safe to use msgbuf */ 102 int msgbuftrigger; 103 104 static int log_console_output = 1; 105 TUNABLE_INT("kern.log_console_output", &log_console_output); 106 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 107 &log_console_output, 0, "Duplicate console output to the syslog."); 108 109 static int always_console_output = 0; 110 TUNABLE_INT("kern.always_console_output", &always_console_output); 111 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW, 112 &always_console_output, 0, "Always output to console despite TIOCCONS."); 113 114 /* 115 * Warn that a system table is full. 116 */ 117 void 118 tablefull(const char *tab) 119 { 120 121 log(LOG_ERR, "%s: table is full\n", tab); 122 } 123 124 /* 125 * Uprintf prints to the controlling terminal for the current process. 126 */ 127 int 128 uprintf(const char *fmt, ...) 129 { 130 va_list ap; 131 struct putchar_arg pca; 132 struct proc *p; 133 struct thread *td; 134 int retval; 135 136 td = curthread; 137 if (TD_IS_IDLETHREAD(td)) 138 return (0); 139 140 sx_slock(&proctree_lock); 141 p = td->td_proc; 142 PROC_LOCK(p); 143 if ((p->p_flag & P_CONTROLT) == 0) { 144 PROC_UNLOCK(p); 145 retval = 0; 146 goto out; 147 } 148 SESS_LOCK(p->p_session); 149 pca.tty = p->p_session->s_ttyp; 150 SESS_UNLOCK(p->p_session); 151 PROC_UNLOCK(p); 152 if (pca.tty == NULL) { 153 retval = 0; 154 goto out; 155 } 156 pca.flags = TOTTY; 157 va_start(ap, fmt); 158 tty_lock(pca.tty); 159 retval = kvprintf(fmt, putchar, &pca, 10, ap); 160 tty_unlock(pca.tty); 161 va_end(ap); 162 out: 163 sx_sunlock(&proctree_lock); 164 return (retval); 165 } 166 167 /* 168 * tprintf prints on the controlling terminal associated with the given 169 * session, possibly to the log as well. 170 */ 171 void 172 tprintf(struct proc *p, int pri, const char *fmt, ...) 173 { 174 struct tty *tp = NULL; 175 int flags = 0; 176 va_list ap; 177 struct putchar_arg pca; 178 struct session *sess = NULL; 179 180 sx_slock(&proctree_lock); 181 if (pri != -1) 182 flags |= TOLOG; 183 if (p != NULL) { 184 PROC_LOCK(p); 185 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 186 sess = p->p_session; 187 sess_hold(sess); 188 PROC_UNLOCK(p); 189 tp = sess->s_ttyp; 190 if (tp != NULL && tty_checkoutq(tp)) 191 flags |= TOTTY; 192 else 193 tp = NULL; 194 } else 195 PROC_UNLOCK(p); 196 } 197 pca.pri = pri; 198 pca.tty = tp; 199 pca.flags = flags; 200 va_start(ap, fmt); 201 if (pca.tty != NULL) 202 tty_lock(pca.tty); 203 kvprintf(fmt, putchar, &pca, 10, ap); 204 if (pca.tty != NULL) 205 tty_unlock(pca.tty); 206 va_end(ap); 207 if (sess != NULL) 208 sess_release(sess); 209 msgbuftrigger = 1; 210 sx_sunlock(&proctree_lock); 211 } 212 213 /* 214 * Ttyprintf displays a message on a tty; it should be used only by 215 * the tty driver, or anything that knows the underlying tty will not 216 * be revoke(2)'d away. Other callers should use tprintf. 217 */ 218 int 219 ttyprintf(struct tty *tp, const char *fmt, ...) 220 { 221 va_list ap; 222 struct putchar_arg pca; 223 int retval; 224 225 va_start(ap, fmt); 226 pca.tty = tp; 227 pca.flags = TOTTY; 228 retval = kvprintf(fmt, putchar, &pca, 10, ap); 229 va_end(ap); 230 return (retval); 231 } 232 233 /* 234 * Log writes to the log buffer, and guarantees not to sleep (so can be 235 * called by interrupt routines). If there is no process reading the 236 * log yet, it writes to the console also. 237 */ 238 void 239 log(int level, const char *fmt, ...) 240 { 241 va_list ap; 242 struct putchar_arg pca; 243 244 pca.tty = NULL; 245 pca.pri = level; 246 pca.flags = log_open ? TOLOG : TOCONS; 247 pca.p_bufr = NULL; 248 249 va_start(ap, fmt); 250 kvprintf(fmt, putchar, &pca, 10, ap); 251 va_end(ap); 252 253 msgbuftrigger = 1; 254 } 255 256 #define CONSCHUNK 128 257 258 void 259 log_console(struct uio *uio) 260 { 261 int c, i, error, nl; 262 char *consbuffer; 263 int pri; 264 265 if (!log_console_output) 266 return; 267 268 pri = LOG_INFO | LOG_CONSOLE; 269 uio = cloneuio(uio); 270 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 271 272 nl = 0; 273 while (uio->uio_resid > 0) { 274 c = imin(uio->uio_resid, CONSCHUNK); 275 error = uiomove(consbuffer, c, uio); 276 if (error != 0) 277 break; 278 for (i = 0; i < c; i++) { 279 msglogchar(consbuffer[i], pri); 280 if (consbuffer[i] == '\n') 281 nl = 1; 282 else 283 nl = 0; 284 } 285 } 286 if (!nl) 287 msglogchar('\n', pri); 288 msgbuftrigger = 1; 289 free(uio, M_IOV); 290 free(consbuffer, M_TEMP); 291 return; 292 } 293 294 int 295 printf(const char *fmt, ...) 296 { 297 va_list ap; 298 int retval; 299 300 va_start(ap, fmt); 301 retval = vprintf(fmt, ap); 302 va_end(ap); 303 304 return (retval); 305 } 306 307 int 308 vprintf(const char *fmt, va_list ap) 309 { 310 struct putchar_arg pca; 311 int retval; 312 #ifdef PRINTF_BUFR_SIZE 313 char bufr[PRINTF_BUFR_SIZE]; 314 #endif 315 316 pca.tty = NULL; 317 pca.flags = TOCONS | TOLOG; 318 pca.pri = -1; 319 #ifdef PRINTF_BUFR_SIZE 320 pca.p_bufr = bufr; 321 pca.p_next = pca.p_bufr; 322 pca.n_bufr = sizeof(bufr); 323 pca.remain = sizeof(bufr); 324 *pca.p_next = '\0'; 325 #else 326 /* Don't buffer console output. */ 327 pca.p_bufr = NULL; 328 #endif 329 330 retval = kvprintf(fmt, putchar, &pca, 10, ap); 331 332 #ifdef PRINTF_BUFR_SIZE 333 /* Write any buffered console output: */ 334 if (*pca.p_bufr != '\0') 335 cnputs(pca.p_bufr); 336 #endif 337 338 if (!panicstr) 339 msgbuftrigger = 1; 340 341 return (retval); 342 } 343 344 static void 345 putcons(int c, struct putchar_arg *ap) 346 { 347 /* Check if no console output buffer was provided. */ 348 if (ap->p_bufr == NULL) 349 /* Output direct to the console. */ 350 cnputc(c); 351 else { 352 /* Buffer the character: */ 353 if (c == '\n') { 354 *ap->p_next++ = '\r'; 355 ap->remain--; 356 } 357 *ap->p_next++ = c; 358 ap->remain--; 359 360 /* Always leave the buffer zero terminated. */ 361 *ap->p_next = '\0'; 362 363 /* Check if the buffer needs to be flushed. */ 364 if (ap->remain < 3 || c == '\n') { 365 cnputs(ap->p_bufr); 366 ap->p_next = ap->p_bufr; 367 ap->remain = ap->n_bufr; 368 *ap->p_next = '\0'; 369 } 370 } 371 } 372 373 /* 374 * Print a character on console or users terminal. If destination is 375 * the console then the last bunch of characters are saved in msgbuf for 376 * inspection later. 377 */ 378 static void 379 putchar(int c, void *arg) 380 { 381 struct putchar_arg *ap = (struct putchar_arg*) arg; 382 struct tty *tp = ap->tty; 383 int flags = ap->flags; 384 385 /* Don't use the tty code after a panic or while in ddb. */ 386 if (kdb_active) { 387 if (c != '\0') 388 cnputc(c); 389 } else if (panicstr || ((flags & TOCONS) && constty == NULL)) { 390 if (c != '\0') 391 putcons(c, ap); 392 } else { 393 if ((flags & TOTTY) && tp != NULL) 394 tty_putchar(tp, c); 395 if (flags & TOCONS) { 396 if (constty != NULL) 397 msgbuf_addchar(&consmsgbuf, c); 398 if (always_console_output && c != '\0') 399 putcons(c, ap); 400 } 401 } 402 if ((flags & TOLOG)) 403 msglogchar(c, ap->pri); 404 } 405 406 /* 407 * Scaled down version of sprintf(3). 408 */ 409 int 410 sprintf(char *buf, const char *cfmt, ...) 411 { 412 int retval; 413 va_list ap; 414 415 va_start(ap, cfmt); 416 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 417 buf[retval] = '\0'; 418 va_end(ap); 419 return (retval); 420 } 421 422 /* 423 * Scaled down version of vsprintf(3). 424 */ 425 int 426 vsprintf(char *buf, const char *cfmt, va_list ap) 427 { 428 int retval; 429 430 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 431 buf[retval] = '\0'; 432 return (retval); 433 } 434 435 /* 436 * Scaled down version of snprintf(3). 437 */ 438 int 439 snprintf(char *str, size_t size, const char *format, ...) 440 { 441 int retval; 442 va_list ap; 443 444 va_start(ap, format); 445 retval = vsnprintf(str, size, format, ap); 446 va_end(ap); 447 return(retval); 448 } 449 450 /* 451 * Scaled down version of vsnprintf(3). 452 */ 453 int 454 vsnprintf(char *str, size_t size, const char *format, va_list ap) 455 { 456 struct snprintf_arg info; 457 int retval; 458 459 info.str = str; 460 info.remain = size; 461 retval = kvprintf(format, snprintf_func, &info, 10, ap); 462 if (info.remain >= 1) 463 *info.str++ = '\0'; 464 return (retval); 465 } 466 467 /* 468 * Kernel version which takes radix argument vsnprintf(3). 469 */ 470 int 471 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 472 { 473 struct snprintf_arg info; 474 int retval; 475 476 info.str = str; 477 info.remain = size; 478 retval = kvprintf(format, snprintf_func, &info, radix, ap); 479 if (info.remain >= 1) 480 *info.str++ = '\0'; 481 return (retval); 482 } 483 484 static void 485 snprintf_func(int ch, void *arg) 486 { 487 struct snprintf_arg *const info = arg; 488 489 if (info->remain >= 2) { 490 *info->str++ = ch; 491 info->remain--; 492 } 493 } 494 495 /* 496 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 497 * order; return an optional length and a pointer to the last character 498 * written in the buffer (i.e., the first character of the string). 499 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 500 */ 501 static char * 502 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 503 { 504 char *p, c; 505 506 p = nbuf; 507 *p = '\0'; 508 do { 509 c = hex2ascii(num % base); 510 *++p = upper ? toupper(c) : c; 511 } while (num /= base); 512 if (lenp) 513 *lenp = p - nbuf; 514 return (p); 515 } 516 517 /* 518 * Scaled down version of printf(3). 519 * 520 * Two additional formats: 521 * 522 * The format %b is supported to decode error registers. 523 * Its usage is: 524 * 525 * printf("reg=%b\n", regval, "<base><arg>*"); 526 * 527 * where <base> is the output base expressed as a control character, e.g. 528 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 529 * the first of which gives the bit number to be inspected (origin 1), and 530 * the next characters (up to a control character, i.e. a character <= 32), 531 * give the name of the register. Thus: 532 * 533 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 534 * 535 * would produce output: 536 * 537 * reg=3<BITTWO,BITONE> 538 * 539 * XXX: %D -- Hexdump, takes pointer and separator string: 540 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 541 * ("%*D", len, ptr, " " -> XX XX XX XX ... 542 */ 543 int 544 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 545 { 546 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 547 char nbuf[MAXNBUF]; 548 char *d; 549 const char *p, *percent, *q; 550 u_char *up; 551 int ch, n; 552 uintmax_t num; 553 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 554 int cflag, hflag, jflag, tflag, zflag; 555 int dwidth, upper; 556 char padc; 557 int stop = 0, retval = 0; 558 559 num = 0; 560 if (!func) 561 d = (char *) arg; 562 else 563 d = NULL; 564 565 if (fmt == NULL) 566 fmt = "(fmt null)\n"; 567 568 if (radix < 2 || radix > 36) 569 radix = 10; 570 571 for (;;) { 572 padc = ' '; 573 width = 0; 574 while ((ch = (u_char)*fmt++) != '%' || stop) { 575 if (ch == '\0') 576 return (retval); 577 PCHAR(ch); 578 } 579 percent = fmt - 1; 580 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 581 sign = 0; dot = 0; dwidth = 0; upper = 0; 582 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 583 reswitch: switch (ch = (u_char)*fmt++) { 584 case '.': 585 dot = 1; 586 goto reswitch; 587 case '#': 588 sharpflag = 1; 589 goto reswitch; 590 case '+': 591 sign = 1; 592 goto reswitch; 593 case '-': 594 ladjust = 1; 595 goto reswitch; 596 case '%': 597 PCHAR(ch); 598 break; 599 case '*': 600 if (!dot) { 601 width = va_arg(ap, int); 602 if (width < 0) { 603 ladjust = !ladjust; 604 width = -width; 605 } 606 } else { 607 dwidth = va_arg(ap, int); 608 } 609 goto reswitch; 610 case '0': 611 if (!dot) { 612 padc = '0'; 613 goto reswitch; 614 } 615 case '1': case '2': case '3': case '4': 616 case '5': case '6': case '7': case '8': case '9': 617 for (n = 0;; ++fmt) { 618 n = n * 10 + ch - '0'; 619 ch = *fmt; 620 if (ch < '0' || ch > '9') 621 break; 622 } 623 if (dot) 624 dwidth = n; 625 else 626 width = n; 627 goto reswitch; 628 case 'b': 629 num = (u_int)va_arg(ap, int); 630 p = va_arg(ap, char *); 631 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 632 PCHAR(*q--); 633 634 if (num == 0) 635 break; 636 637 for (tmp = 0; *p;) { 638 n = *p++; 639 if (num & (1 << (n - 1))) { 640 PCHAR(tmp ? ',' : '<'); 641 for (; (n = *p) > ' '; ++p) 642 PCHAR(n); 643 tmp = 1; 644 } else 645 for (; *p > ' '; ++p) 646 continue; 647 } 648 if (tmp) 649 PCHAR('>'); 650 break; 651 case 'c': 652 PCHAR(va_arg(ap, int)); 653 break; 654 case 'D': 655 up = va_arg(ap, u_char *); 656 p = va_arg(ap, char *); 657 if (!width) 658 width = 16; 659 while(width--) { 660 PCHAR(hex2ascii(*up >> 4)); 661 PCHAR(hex2ascii(*up & 0x0f)); 662 up++; 663 if (width) 664 for (q=p;*q;q++) 665 PCHAR(*q); 666 } 667 break; 668 case 'd': 669 case 'i': 670 base = 10; 671 sign = 1; 672 goto handle_sign; 673 case 'h': 674 if (hflag) { 675 hflag = 0; 676 cflag = 1; 677 } else 678 hflag = 1; 679 goto reswitch; 680 case 'j': 681 jflag = 1; 682 goto reswitch; 683 case 'l': 684 if (lflag) { 685 lflag = 0; 686 qflag = 1; 687 } else 688 lflag = 1; 689 goto reswitch; 690 case 'n': 691 if (jflag) 692 *(va_arg(ap, intmax_t *)) = retval; 693 else if (qflag) 694 *(va_arg(ap, quad_t *)) = retval; 695 else if (lflag) 696 *(va_arg(ap, long *)) = retval; 697 else if (zflag) 698 *(va_arg(ap, size_t *)) = retval; 699 else if (hflag) 700 *(va_arg(ap, short *)) = retval; 701 else if (cflag) 702 *(va_arg(ap, char *)) = retval; 703 else 704 *(va_arg(ap, int *)) = retval; 705 break; 706 case 'o': 707 base = 8; 708 goto handle_nosign; 709 case 'p': 710 base = 16; 711 sharpflag = (width == 0); 712 sign = 0; 713 num = (uintptr_t)va_arg(ap, void *); 714 goto number; 715 case 'q': 716 qflag = 1; 717 goto reswitch; 718 case 'r': 719 base = radix; 720 if (sign) 721 goto handle_sign; 722 goto handle_nosign; 723 case 's': 724 p = va_arg(ap, char *); 725 if (p == NULL) 726 p = "(null)"; 727 if (!dot) 728 n = strlen (p); 729 else 730 for (n = 0; n < dwidth && p[n]; n++) 731 continue; 732 733 width -= n; 734 735 if (!ladjust && width > 0) 736 while (width--) 737 PCHAR(padc); 738 while (n--) 739 PCHAR(*p++); 740 if (ladjust && width > 0) 741 while (width--) 742 PCHAR(padc); 743 break; 744 case 't': 745 tflag = 1; 746 goto reswitch; 747 case 'u': 748 base = 10; 749 goto handle_nosign; 750 case 'X': 751 upper = 1; 752 case 'x': 753 base = 16; 754 goto handle_nosign; 755 case 'y': 756 base = 16; 757 sign = 1; 758 goto handle_sign; 759 case 'z': 760 zflag = 1; 761 goto reswitch; 762 handle_nosign: 763 sign = 0; 764 if (jflag) 765 num = va_arg(ap, uintmax_t); 766 else if (qflag) 767 num = va_arg(ap, u_quad_t); 768 else if (tflag) 769 num = va_arg(ap, ptrdiff_t); 770 else if (lflag) 771 num = va_arg(ap, u_long); 772 else if (zflag) 773 num = va_arg(ap, size_t); 774 else if (hflag) 775 num = (u_short)va_arg(ap, int); 776 else if (cflag) 777 num = (u_char)va_arg(ap, int); 778 else 779 num = va_arg(ap, u_int); 780 goto number; 781 handle_sign: 782 if (jflag) 783 num = va_arg(ap, intmax_t); 784 else if (qflag) 785 num = va_arg(ap, quad_t); 786 else if (tflag) 787 num = va_arg(ap, ptrdiff_t); 788 else if (lflag) 789 num = va_arg(ap, long); 790 else if (zflag) 791 num = va_arg(ap, ssize_t); 792 else if (hflag) 793 num = (short)va_arg(ap, int); 794 else if (cflag) 795 num = (char)va_arg(ap, int); 796 else 797 num = va_arg(ap, int); 798 number: 799 if (sign && (intmax_t)num < 0) { 800 neg = 1; 801 num = -(intmax_t)num; 802 } 803 p = ksprintn(nbuf, num, base, &tmp, upper); 804 if (sharpflag && num != 0) { 805 if (base == 8) 806 tmp++; 807 else if (base == 16) 808 tmp += 2; 809 } 810 if (neg) 811 tmp++; 812 813 if (!ladjust && padc != '0' && width 814 && (width -= tmp) > 0) 815 while (width--) 816 PCHAR(padc); 817 if (neg) 818 PCHAR('-'); 819 if (sharpflag && num != 0) { 820 if (base == 8) { 821 PCHAR('0'); 822 } else if (base == 16) { 823 PCHAR('0'); 824 PCHAR('x'); 825 } 826 } 827 if (!ladjust && width && (width -= tmp) > 0) 828 while (width--) 829 PCHAR(padc); 830 831 while (*p) 832 PCHAR(*p--); 833 834 if (ladjust && width && (width -= tmp) > 0) 835 while (width--) 836 PCHAR(padc); 837 838 break; 839 default: 840 while (percent < fmt) 841 PCHAR(*percent++); 842 /* 843 * Since we ignore an formatting argument it is no 844 * longer safe to obey the remaining formatting 845 * arguments as the arguments will no longer match 846 * the format specs. 847 */ 848 stop = 1; 849 break; 850 } 851 } 852 #undef PCHAR 853 } 854 855 /* 856 * Put character in log buffer with a particular priority. 857 */ 858 static void 859 msglogchar(int c, int pri) 860 { 861 static int lastpri = -1; 862 static int dangling; 863 char nbuf[MAXNBUF]; 864 char *p; 865 866 if (!msgbufmapped) 867 return; 868 if (c == '\0' || c == '\r') 869 return; 870 if (pri != -1 && pri != lastpri) { 871 if (dangling) { 872 msgbuf_addchar(msgbufp, '\n'); 873 dangling = 0; 874 } 875 msgbuf_addchar(msgbufp, '<'); 876 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 877 msgbuf_addchar(msgbufp, *p--); 878 msgbuf_addchar(msgbufp, '>'); 879 lastpri = pri; 880 } 881 msgbuf_addchar(msgbufp, c); 882 if (c == '\n') { 883 dangling = 0; 884 lastpri = -1; 885 } else { 886 dangling = 1; 887 } 888 } 889 890 void 891 msgbufinit(void *ptr, int size) 892 { 893 char *cp; 894 static struct msgbuf *oldp = NULL; 895 896 size -= sizeof(*msgbufp); 897 cp = (char *)ptr; 898 msgbufp = (struct msgbuf *)(cp + size); 899 msgbuf_reinit(msgbufp, cp, size); 900 if (msgbufmapped && oldp != msgbufp) 901 msgbuf_copy(oldp, msgbufp); 902 msgbufmapped = 1; 903 oldp = msgbufp; 904 } 905 906 static int unprivileged_read_msgbuf = 1; 907 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 908 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 909 "Unprivileged processes may read the kernel message buffer"); 910 911 /* Sysctls for accessing/clearing the msgbuf */ 912 static int 913 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 914 { 915 char buf[128]; 916 u_int seq; 917 int error, len; 918 919 if (!unprivileged_read_msgbuf) { 920 error = priv_check(req->td, PRIV_MSGBUF); 921 if (error) 922 return (error); 923 } 924 925 /* Read the whole buffer, one chunk at a time. */ 926 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 927 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 928 error = sysctl_handle_opaque(oidp, buf, len, req); 929 if (error) 930 return (error); 931 } 932 return (0); 933 } 934 935 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 936 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 937 938 static int msgbuf_clearflag; 939 940 static int 941 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 942 { 943 int error; 944 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 945 if (!error && req->newptr) { 946 msgbuf_clear(msgbufp); 947 msgbuf_clearflag = 0; 948 } 949 return (error); 950 } 951 952 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 953 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 954 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 955 956 #ifdef DDB 957 958 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 959 { 960 int i, j; 961 962 if (!msgbufmapped) { 963 db_printf("msgbuf not mapped yet\n"); 964 return; 965 } 966 db_printf("msgbufp = %p\n", msgbufp); 967 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 968 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 969 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 970 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 971 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 972 db_printf("%c", msgbufp->msg_ptr[j]); 973 } 974 db_printf("\n"); 975 } 976 977 #endif /* DDB */ 978 979 void 980 hexdump(const void *ptr, int length, const char *hdr, int flags) 981 { 982 int i, j, k; 983 int cols; 984 const unsigned char *cp; 985 char delim; 986 987 if ((flags & HD_DELIM_MASK) != 0) 988 delim = (flags & HD_DELIM_MASK) >> 8; 989 else 990 delim = ' '; 991 992 if ((flags & HD_COLUMN_MASK) != 0) 993 cols = flags & HD_COLUMN_MASK; 994 else 995 cols = 16; 996 997 cp = ptr; 998 for (i = 0; i < length; i+= cols) { 999 if (hdr != NULL) 1000 printf("%s", hdr); 1001 1002 if ((flags & HD_OMIT_COUNT) == 0) 1003 printf("%04x ", i); 1004 1005 if ((flags & HD_OMIT_HEX) == 0) { 1006 for (j = 0; j < cols; j++) { 1007 k = i + j; 1008 if (k < length) 1009 printf("%c%02x", delim, cp[k]); 1010 else 1011 printf(" "); 1012 } 1013 } 1014 1015 if ((flags & HD_OMIT_CHARS) == 0) { 1016 printf(" |"); 1017 for (j = 0; j < cols; j++) { 1018 k = i + j; 1019 if (k >= length) 1020 printf(" "); 1021 else if (cp[k] >= ' ' && cp[k] <= '~') 1022 printf("%c", cp[k]); 1023 else 1024 printf("."); 1025 } 1026 printf("|"); 1027 } 1028 printf("\n"); 1029 } 1030 } 1031 1032