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 struct thread *td = curthread; 131 struct proc *p = td->td_proc; 132 va_list ap; 133 struct putchar_arg pca; 134 int retval; 135 136 if (td == NULL || TD_IS_IDLETHREAD(td)) 137 return (0); 138 139 sx_slock(&proctree_lock); 140 PROC_LOCK(p); 141 if ((p->p_flag & P_CONTROLT) == 0) { 142 PROC_UNLOCK(p); 143 retval = 0; 144 goto out; 145 } 146 SESS_LOCK(p->p_session); 147 pca.tty = p->p_session->s_ttyp; 148 SESS_UNLOCK(p->p_session); 149 PROC_UNLOCK(p); 150 if (pca.tty == NULL) { 151 retval = 0; 152 goto out; 153 } 154 pca.flags = TOTTY; 155 va_start(ap, fmt); 156 tty_lock(pca.tty); 157 retval = kvprintf(fmt, putchar, &pca, 10, ap); 158 tty_unlock(pca.tty); 159 va_end(ap); 160 out: 161 sx_sunlock(&proctree_lock); 162 return (retval); 163 } 164 165 /* 166 * tprintf prints on the controlling terminal associated with the given 167 * session, possibly to the log as well. 168 */ 169 void 170 tprintf(struct proc *p, int pri, const char *fmt, ...) 171 { 172 struct tty *tp = NULL; 173 int flags = 0; 174 va_list ap; 175 struct putchar_arg pca; 176 struct session *sess = NULL; 177 178 sx_slock(&proctree_lock); 179 if (pri != -1) 180 flags |= TOLOG; 181 if (p != NULL) { 182 PROC_LOCK(p); 183 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 184 sess = p->p_session; 185 sess_hold(sess); 186 PROC_UNLOCK(p); 187 tp = sess->s_ttyp; 188 if (tp != NULL && tty_checkoutq(tp)) 189 flags |= TOTTY; 190 else 191 tp = NULL; 192 } else 193 PROC_UNLOCK(p); 194 } 195 pca.pri = pri; 196 pca.tty = tp; 197 pca.flags = flags; 198 va_start(ap, fmt); 199 if (pca.tty != NULL) 200 tty_lock(pca.tty); 201 kvprintf(fmt, putchar, &pca, 10, ap); 202 if (pca.tty != NULL) 203 tty_unlock(pca.tty); 204 va_end(ap); 205 if (sess != NULL) 206 sess_release(sess); 207 msgbuftrigger = 1; 208 sx_sunlock(&proctree_lock); 209 } 210 211 /* 212 * Ttyprintf displays a message on a tty; it should be used only by 213 * the tty driver, or anything that knows the underlying tty will not 214 * be revoke(2)'d away. Other callers should use tprintf. 215 */ 216 int 217 ttyprintf(struct tty *tp, const char *fmt, ...) 218 { 219 va_list ap; 220 struct putchar_arg pca; 221 int retval; 222 223 va_start(ap, fmt); 224 pca.tty = tp; 225 pca.flags = TOTTY; 226 retval = kvprintf(fmt, putchar, &pca, 10, ap); 227 va_end(ap); 228 return (retval); 229 } 230 231 /* 232 * Log writes to the log buffer, and guarantees not to sleep (so can be 233 * called by interrupt routines). If there is no process reading the 234 * log yet, it writes to the console also. 235 */ 236 void 237 log(int level, const char *fmt, ...) 238 { 239 va_list ap; 240 struct putchar_arg pca; 241 242 pca.tty = NULL; 243 pca.pri = level; 244 pca.flags = log_open ? TOLOG : TOCONS; 245 pca.p_bufr = NULL; 246 247 va_start(ap, fmt); 248 kvprintf(fmt, putchar, &pca, 10, ap); 249 va_end(ap); 250 251 msgbuftrigger = 1; 252 } 253 254 #define CONSCHUNK 128 255 256 void 257 log_console(struct uio *uio) 258 { 259 int c, i, error, nl; 260 char *consbuffer; 261 int pri; 262 263 if (!log_console_output) 264 return; 265 266 pri = LOG_INFO | LOG_CONSOLE; 267 uio = cloneuio(uio); 268 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 269 270 nl = 0; 271 while (uio->uio_resid > 0) { 272 c = imin(uio->uio_resid, CONSCHUNK); 273 error = uiomove(consbuffer, c, uio); 274 if (error != 0) 275 break; 276 for (i = 0; i < c; i++) { 277 msglogchar(consbuffer[i], pri); 278 if (consbuffer[i] == '\n') 279 nl = 1; 280 else 281 nl = 0; 282 } 283 } 284 if (!nl) 285 msglogchar('\n', pri); 286 msgbuftrigger = 1; 287 free(uio, M_IOV); 288 free(consbuffer, M_TEMP); 289 return; 290 } 291 292 int 293 printf(const char *fmt, ...) 294 { 295 va_list ap; 296 struct putchar_arg pca; 297 int retval; 298 #ifdef PRINTF_BUFR_SIZE 299 char bufr[PRINTF_BUFR_SIZE]; 300 #endif 301 302 va_start(ap, fmt); 303 pca.tty = NULL; 304 pca.flags = TOCONS | TOLOG; 305 pca.pri = -1; 306 #ifdef PRINTF_BUFR_SIZE 307 pca.p_bufr = bufr; 308 pca.p_next = pca.p_bufr; 309 pca.n_bufr = sizeof(bufr); 310 pca.remain = sizeof(bufr); 311 *pca.p_next = '\0'; 312 #else 313 /* Don't buffer console output. */ 314 pca.p_bufr = NULL; 315 #endif 316 317 retval = kvprintf(fmt, putchar, &pca, 10, ap); 318 va_end(ap); 319 320 #ifdef PRINTF_BUFR_SIZE 321 /* Write any buffered console output: */ 322 if (*pca.p_bufr != '\0') 323 cnputs(pca.p_bufr); 324 #endif 325 326 if (!panicstr) 327 msgbuftrigger = 1; 328 329 return (retval); 330 } 331 332 int 333 vprintf(const char *fmt, va_list ap) 334 { 335 struct putchar_arg pca; 336 int retval; 337 #ifdef PRINTF_BUFR_SIZE 338 char bufr[PRINTF_BUFR_SIZE]; 339 #endif 340 341 pca.tty = NULL; 342 pca.flags = TOCONS | TOLOG; 343 pca.pri = -1; 344 #ifdef PRINTF_BUFR_SIZE 345 pca.p_bufr = bufr; 346 pca.p_next = pca.p_bufr; 347 pca.n_bufr = sizeof(bufr); 348 pca.remain = sizeof(bufr); 349 *pca.p_next = '\0'; 350 #else 351 /* Don't buffer console output. */ 352 pca.p_bufr = NULL; 353 #endif 354 355 retval = kvprintf(fmt, putchar, &pca, 10, ap); 356 357 #ifdef PRINTF_BUFR_SIZE 358 /* Write any buffered console output: */ 359 if (*pca.p_bufr != '\0') 360 cnputs(pca.p_bufr); 361 #endif 362 363 if (!panicstr) 364 msgbuftrigger = 1; 365 366 return (retval); 367 } 368 369 static void 370 putcons(int c, struct putchar_arg *ap) 371 { 372 /* Check if no console output buffer was provided. */ 373 if (ap->p_bufr == NULL) 374 /* Output direct to the console. */ 375 cnputc(c); 376 else { 377 /* Buffer the character: */ 378 if (c == '\n') { 379 *ap->p_next++ = '\r'; 380 ap->remain--; 381 } 382 *ap->p_next++ = c; 383 ap->remain--; 384 385 /* Always leave the buffer zero terminated. */ 386 *ap->p_next = '\0'; 387 388 /* Check if the buffer needs to be flushed. */ 389 if (ap->remain < 3 || c == '\n') { 390 cnputs(ap->p_bufr); 391 ap->p_next = ap->p_bufr; 392 ap->remain = ap->n_bufr; 393 *ap->p_next = '\0'; 394 } 395 } 396 } 397 398 /* 399 * Print a character on console or users terminal. If destination is 400 * the console then the last bunch of characters are saved in msgbuf for 401 * inspection later. 402 */ 403 static void 404 putchar(int c, void *arg) 405 { 406 struct putchar_arg *ap = (struct putchar_arg*) arg; 407 struct tty *tp = ap->tty; 408 int flags = ap->flags; 409 410 /* Don't use the tty code after a panic or while in ddb. */ 411 if (kdb_active) { 412 if (c != '\0') 413 cnputc(c); 414 } else if (panicstr || ((flags & TOCONS) && constty == NULL)) { 415 if (c != '\0') 416 putcons(c, ap); 417 } else { 418 if ((flags & TOTTY) && tp != NULL) 419 tty_putchar(tp, c); 420 if (flags & TOCONS) { 421 if (constty != NULL) 422 msgbuf_addchar(&consmsgbuf, c); 423 if (always_console_output && c != '\0') 424 putcons(c, ap); 425 } 426 } 427 if ((flags & TOLOG)) 428 msglogchar(c, ap->pri); 429 } 430 431 /* 432 * Scaled down version of sprintf(3). 433 */ 434 int 435 sprintf(char *buf, const char *cfmt, ...) 436 { 437 int retval; 438 va_list ap; 439 440 va_start(ap, cfmt); 441 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 442 buf[retval] = '\0'; 443 va_end(ap); 444 return (retval); 445 } 446 447 /* 448 * Scaled down version of vsprintf(3). 449 */ 450 int 451 vsprintf(char *buf, const char *cfmt, va_list ap) 452 { 453 int retval; 454 455 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 456 buf[retval] = '\0'; 457 return (retval); 458 } 459 460 /* 461 * Scaled down version of snprintf(3). 462 */ 463 int 464 snprintf(char *str, size_t size, const char *format, ...) 465 { 466 int retval; 467 va_list ap; 468 469 va_start(ap, format); 470 retval = vsnprintf(str, size, format, ap); 471 va_end(ap); 472 return(retval); 473 } 474 475 /* 476 * Scaled down version of vsnprintf(3). 477 */ 478 int 479 vsnprintf(char *str, size_t size, const char *format, va_list ap) 480 { 481 struct snprintf_arg info; 482 int retval; 483 484 info.str = str; 485 info.remain = size; 486 retval = kvprintf(format, snprintf_func, &info, 10, ap); 487 if (info.remain >= 1) 488 *info.str++ = '\0'; 489 return (retval); 490 } 491 492 /* 493 * Kernel version which takes radix argument vsnprintf(3). 494 */ 495 int 496 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 497 { 498 struct snprintf_arg info; 499 int retval; 500 501 info.str = str; 502 info.remain = size; 503 retval = kvprintf(format, snprintf_func, &info, radix, ap); 504 if (info.remain >= 1) 505 *info.str++ = '\0'; 506 return (retval); 507 } 508 509 static void 510 snprintf_func(int ch, void *arg) 511 { 512 struct snprintf_arg *const info = arg; 513 514 if (info->remain >= 2) { 515 *info->str++ = ch; 516 info->remain--; 517 } 518 } 519 520 /* 521 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 522 * order; return an optional length and a pointer to the last character 523 * written in the buffer (i.e., the first character of the string). 524 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 525 */ 526 static char * 527 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 528 { 529 char *p, c; 530 531 p = nbuf; 532 *p = '\0'; 533 do { 534 c = hex2ascii(num % base); 535 *++p = upper ? toupper(c) : c; 536 } while (num /= base); 537 if (lenp) 538 *lenp = p - nbuf; 539 return (p); 540 } 541 542 /* 543 * Scaled down version of printf(3). 544 * 545 * Two additional formats: 546 * 547 * The format %b is supported to decode error registers. 548 * Its usage is: 549 * 550 * printf("reg=%b\n", regval, "<base><arg>*"); 551 * 552 * where <base> is the output base expressed as a control character, e.g. 553 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 554 * the first of which gives the bit number to be inspected (origin 1), and 555 * the next characters (up to a control character, i.e. a character <= 32), 556 * give the name of the register. Thus: 557 * 558 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 559 * 560 * would produce output: 561 * 562 * reg=3<BITTWO,BITONE> 563 * 564 * XXX: %D -- Hexdump, takes pointer and separator string: 565 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 566 * ("%*D", len, ptr, " " -> XX XX XX XX ... 567 */ 568 int 569 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 570 { 571 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 572 char nbuf[MAXNBUF]; 573 char *d; 574 const char *p, *percent, *q; 575 u_char *up; 576 int ch, n; 577 uintmax_t num; 578 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 579 int cflag, hflag, jflag, tflag, zflag; 580 int dwidth, upper; 581 char padc; 582 int stop = 0, retval = 0; 583 584 num = 0; 585 if (!func) 586 d = (char *) arg; 587 else 588 d = NULL; 589 590 if (fmt == NULL) 591 fmt = "(fmt null)\n"; 592 593 if (radix < 2 || radix > 36) 594 radix = 10; 595 596 for (;;) { 597 padc = ' '; 598 width = 0; 599 while ((ch = (u_char)*fmt++) != '%' || stop) { 600 if (ch == '\0') 601 return (retval); 602 PCHAR(ch); 603 } 604 percent = fmt - 1; 605 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 606 sign = 0; dot = 0; dwidth = 0; upper = 0; 607 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 608 reswitch: switch (ch = (u_char)*fmt++) { 609 case '.': 610 dot = 1; 611 goto reswitch; 612 case '#': 613 sharpflag = 1; 614 goto reswitch; 615 case '+': 616 sign = 1; 617 goto reswitch; 618 case '-': 619 ladjust = 1; 620 goto reswitch; 621 case '%': 622 PCHAR(ch); 623 break; 624 case '*': 625 if (!dot) { 626 width = va_arg(ap, int); 627 if (width < 0) { 628 ladjust = !ladjust; 629 width = -width; 630 } 631 } else { 632 dwidth = va_arg(ap, int); 633 } 634 goto reswitch; 635 case '0': 636 if (!dot) { 637 padc = '0'; 638 goto reswitch; 639 } 640 case '1': case '2': case '3': case '4': 641 case '5': case '6': case '7': case '8': case '9': 642 for (n = 0;; ++fmt) { 643 n = n * 10 + ch - '0'; 644 ch = *fmt; 645 if (ch < '0' || ch > '9') 646 break; 647 } 648 if (dot) 649 dwidth = n; 650 else 651 width = n; 652 goto reswitch; 653 case 'b': 654 num = (u_int)va_arg(ap, int); 655 p = va_arg(ap, char *); 656 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 657 PCHAR(*q--); 658 659 if (num == 0) 660 break; 661 662 for (tmp = 0; *p;) { 663 n = *p++; 664 if (num & (1 << (n - 1))) { 665 PCHAR(tmp ? ',' : '<'); 666 for (; (n = *p) > ' '; ++p) 667 PCHAR(n); 668 tmp = 1; 669 } else 670 for (; *p > ' '; ++p) 671 continue; 672 } 673 if (tmp) 674 PCHAR('>'); 675 break; 676 case 'c': 677 PCHAR(va_arg(ap, int)); 678 break; 679 case 'D': 680 up = va_arg(ap, u_char *); 681 p = va_arg(ap, char *); 682 if (!width) 683 width = 16; 684 while(width--) { 685 PCHAR(hex2ascii(*up >> 4)); 686 PCHAR(hex2ascii(*up & 0x0f)); 687 up++; 688 if (width) 689 for (q=p;*q;q++) 690 PCHAR(*q); 691 } 692 break; 693 case 'd': 694 case 'i': 695 base = 10; 696 sign = 1; 697 goto handle_sign; 698 case 'h': 699 if (hflag) { 700 hflag = 0; 701 cflag = 1; 702 } else 703 hflag = 1; 704 goto reswitch; 705 case 'j': 706 jflag = 1; 707 goto reswitch; 708 case 'l': 709 if (lflag) { 710 lflag = 0; 711 qflag = 1; 712 } else 713 lflag = 1; 714 goto reswitch; 715 case 'n': 716 if (jflag) 717 *(va_arg(ap, intmax_t *)) = retval; 718 else if (qflag) 719 *(va_arg(ap, quad_t *)) = retval; 720 else if (lflag) 721 *(va_arg(ap, long *)) = retval; 722 else if (zflag) 723 *(va_arg(ap, size_t *)) = retval; 724 else if (hflag) 725 *(va_arg(ap, short *)) = retval; 726 else if (cflag) 727 *(va_arg(ap, char *)) = retval; 728 else 729 *(va_arg(ap, int *)) = retval; 730 break; 731 case 'o': 732 base = 8; 733 goto handle_nosign; 734 case 'p': 735 base = 16; 736 sharpflag = (width == 0); 737 sign = 0; 738 num = (uintptr_t)va_arg(ap, void *); 739 goto number; 740 case 'q': 741 qflag = 1; 742 goto reswitch; 743 case 'r': 744 base = radix; 745 if (sign) 746 goto handle_sign; 747 goto handle_nosign; 748 case 's': 749 p = va_arg(ap, char *); 750 if (p == NULL) 751 p = "(null)"; 752 if (!dot) 753 n = strlen (p); 754 else 755 for (n = 0; n < dwidth && p[n]; n++) 756 continue; 757 758 width -= n; 759 760 if (!ladjust && width > 0) 761 while (width--) 762 PCHAR(padc); 763 while (n--) 764 PCHAR(*p++); 765 if (ladjust && width > 0) 766 while (width--) 767 PCHAR(padc); 768 break; 769 case 't': 770 tflag = 1; 771 goto reswitch; 772 case 'u': 773 base = 10; 774 goto handle_nosign; 775 case 'X': 776 upper = 1; 777 case 'x': 778 base = 16; 779 goto handle_nosign; 780 case 'y': 781 base = 16; 782 sign = 1; 783 goto handle_sign; 784 case 'z': 785 zflag = 1; 786 goto reswitch; 787 handle_nosign: 788 sign = 0; 789 if (jflag) 790 num = va_arg(ap, uintmax_t); 791 else if (qflag) 792 num = va_arg(ap, u_quad_t); 793 else if (tflag) 794 num = va_arg(ap, ptrdiff_t); 795 else if (lflag) 796 num = va_arg(ap, u_long); 797 else if (zflag) 798 num = va_arg(ap, size_t); 799 else if (hflag) 800 num = (u_short)va_arg(ap, int); 801 else if (cflag) 802 num = (u_char)va_arg(ap, int); 803 else 804 num = va_arg(ap, u_int); 805 goto number; 806 handle_sign: 807 if (jflag) 808 num = va_arg(ap, intmax_t); 809 else if (qflag) 810 num = va_arg(ap, quad_t); 811 else if (tflag) 812 num = va_arg(ap, ptrdiff_t); 813 else if (lflag) 814 num = va_arg(ap, long); 815 else if (zflag) 816 num = va_arg(ap, ssize_t); 817 else if (hflag) 818 num = (short)va_arg(ap, int); 819 else if (cflag) 820 num = (char)va_arg(ap, int); 821 else 822 num = va_arg(ap, int); 823 number: 824 if (sign && (intmax_t)num < 0) { 825 neg = 1; 826 num = -(intmax_t)num; 827 } 828 p = ksprintn(nbuf, num, base, &tmp, upper); 829 if (sharpflag && num != 0) { 830 if (base == 8) 831 tmp++; 832 else if (base == 16) 833 tmp += 2; 834 } 835 if (neg) 836 tmp++; 837 838 if (!ladjust && padc != '0' && width 839 && (width -= tmp) > 0) 840 while (width--) 841 PCHAR(padc); 842 if (neg) 843 PCHAR('-'); 844 if (sharpflag && num != 0) { 845 if (base == 8) { 846 PCHAR('0'); 847 } else if (base == 16) { 848 PCHAR('0'); 849 PCHAR('x'); 850 } 851 } 852 if (!ladjust && width && (width -= tmp) > 0) 853 while (width--) 854 PCHAR(padc); 855 856 while (*p) 857 PCHAR(*p--); 858 859 if (ladjust && width && (width -= tmp) > 0) 860 while (width--) 861 PCHAR(padc); 862 863 break; 864 default: 865 while (percent < fmt) 866 PCHAR(*percent++); 867 /* 868 * Since we ignore an formatting argument it is no 869 * longer safe to obey the remaining formatting 870 * arguments as the arguments will no longer match 871 * the format specs. 872 */ 873 stop = 1; 874 break; 875 } 876 } 877 #undef PCHAR 878 } 879 880 /* 881 * Put character in log buffer with a particular priority. 882 */ 883 static void 884 msglogchar(int c, int pri) 885 { 886 static int lastpri = -1; 887 static int dangling; 888 char nbuf[MAXNBUF]; 889 char *p; 890 891 if (!msgbufmapped) 892 return; 893 if (c == '\0' || c == '\r') 894 return; 895 if (pri != -1 && pri != lastpri) { 896 if (dangling) { 897 msgbuf_addchar(msgbufp, '\n'); 898 dangling = 0; 899 } 900 msgbuf_addchar(msgbufp, '<'); 901 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 902 msgbuf_addchar(msgbufp, *p--); 903 msgbuf_addchar(msgbufp, '>'); 904 lastpri = pri; 905 } 906 msgbuf_addchar(msgbufp, c); 907 if (c == '\n') { 908 dangling = 0; 909 lastpri = -1; 910 } else { 911 dangling = 1; 912 } 913 } 914 915 void 916 msgbufinit(void *ptr, int size) 917 { 918 char *cp; 919 static struct msgbuf *oldp = NULL; 920 921 size -= sizeof(*msgbufp); 922 cp = (char *)ptr; 923 msgbufp = (struct msgbuf *)(cp + size); 924 msgbuf_reinit(msgbufp, cp, size); 925 if (msgbufmapped && oldp != msgbufp) 926 msgbuf_copy(oldp, msgbufp); 927 msgbufmapped = 1; 928 oldp = msgbufp; 929 } 930 931 static int unprivileged_read_msgbuf = 1; 932 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 933 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 934 "Unprivileged processes may read the kernel message buffer"); 935 936 /* Sysctls for accessing/clearing the msgbuf */ 937 static int 938 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 939 { 940 char buf[128]; 941 u_int seq; 942 int error, len; 943 944 if (!unprivileged_read_msgbuf) { 945 error = priv_check(req->td, PRIV_MSGBUF); 946 if (error) 947 return (error); 948 } 949 950 /* Read the whole buffer, one chunk at a time. */ 951 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 952 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 953 error = sysctl_handle_opaque(oidp, buf, len, req); 954 if (error) 955 return (error); 956 } 957 return (0); 958 } 959 960 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 961 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 962 963 static int msgbuf_clearflag; 964 965 static int 966 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 967 { 968 int error; 969 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 970 if (!error && req->newptr) { 971 msgbuf_clear(msgbufp); 972 msgbuf_clearflag = 0; 973 } 974 return (error); 975 } 976 977 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 978 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 979 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 980 981 #ifdef DDB 982 983 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 984 { 985 int i, j; 986 987 if (!msgbufmapped) { 988 db_printf("msgbuf not mapped yet\n"); 989 return; 990 } 991 db_printf("msgbufp = %p\n", msgbufp); 992 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 993 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 994 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 995 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 996 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 997 db_printf("%c", msgbufp->msg_ptr[j]); 998 } 999 db_printf("\n"); 1000 } 1001 1002 #endif /* DDB */ 1003 1004 void 1005 hexdump(const void *ptr, int length, const char *hdr, int flags) 1006 { 1007 int i, j, k; 1008 int cols; 1009 const unsigned char *cp; 1010 char delim; 1011 1012 if ((flags & HD_DELIM_MASK) != 0) 1013 delim = (flags & HD_DELIM_MASK) >> 8; 1014 else 1015 delim = ' '; 1016 1017 if ((flags & HD_COLUMN_MASK) != 0) 1018 cols = flags & HD_COLUMN_MASK; 1019 else 1020 cols = 16; 1021 1022 cp = ptr; 1023 for (i = 0; i < length; i+= cols) { 1024 if (hdr != NULL) 1025 printf("%s", hdr); 1026 1027 if ((flags & HD_OMIT_COUNT) == 0) 1028 printf("%04x ", i); 1029 1030 if ((flags & HD_OMIT_HEX) == 0) { 1031 for (j = 0; j < cols; j++) { 1032 k = i + j; 1033 if (k < length) 1034 printf("%c%02x", delim, cp[k]); 1035 else 1036 printf(" "); 1037 } 1038 } 1039 1040 if ((flags & HD_OMIT_CHARS) == 0) { 1041 printf(" |"); 1042 for (j = 0; j < cols; j++) { 1043 k = i + j; 1044 if (k >= length) 1045 printf(" "); 1046 else if (cp[k] >= ' ' && cp[k] <= '~') 1047 printf("%c", cp[k]); 1048 else 1049 printf("."); 1050 } 1051 printf("|"); 1052 } 1053 printf("\n"); 1054 } 1055 } 1056 1057