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 p = td->td_proc; 141 PROC_LOCK(p); 142 if ((p->p_flag & P_CONTROLT) == 0) { 143 PROC_UNLOCK(p); 144 retval = 0; 145 goto out; 146 } 147 SESS_LOCK(p->p_session); 148 pca.tty = p->p_session->s_ttyp; 149 SESS_UNLOCK(p->p_session); 150 PROC_UNLOCK(p); 151 if (pca.tty == NULL) { 152 retval = 0; 153 goto out; 154 } 155 pca.flags = TOTTY; 156 va_start(ap, fmt); 157 tty_lock(pca.tty); 158 retval = kvprintf(fmt, putchar, &pca, 10, ap); 159 tty_unlock(pca.tty); 160 va_end(ap); 161 out: 162 sx_sunlock(&proctree_lock); 163 return (retval); 164 } 165 166 /* 167 * tprintf prints on the controlling terminal associated with the given 168 * session, possibly to the log as well. 169 */ 170 void 171 tprintf(struct proc *p, int pri, const char *fmt, ...) 172 { 173 struct tty *tp = NULL; 174 int flags = 0; 175 va_list ap; 176 struct putchar_arg pca; 177 struct session *sess = NULL; 178 179 sx_slock(&proctree_lock); 180 if (pri != -1) 181 flags |= TOLOG; 182 if (p != NULL) { 183 PROC_LOCK(p); 184 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 185 sess = p->p_session; 186 sess_hold(sess); 187 PROC_UNLOCK(p); 188 tp = sess->s_ttyp; 189 if (tp != NULL && tty_checkoutq(tp)) 190 flags |= TOTTY; 191 else 192 tp = NULL; 193 } else 194 PROC_UNLOCK(p); 195 } 196 pca.pri = pri; 197 pca.tty = tp; 198 pca.flags = flags; 199 va_start(ap, fmt); 200 if (pca.tty != NULL) 201 tty_lock(pca.tty); 202 kvprintf(fmt, putchar, &pca, 10, ap); 203 if (pca.tty != NULL) 204 tty_unlock(pca.tty); 205 va_end(ap); 206 if (sess != NULL) 207 sess_release(sess); 208 msgbuftrigger = 1; 209 sx_sunlock(&proctree_lock); 210 } 211 212 /* 213 * Ttyprintf displays a message on a tty; it should be used only by 214 * the tty driver, or anything that knows the underlying tty will not 215 * be revoke(2)'d away. Other callers should use tprintf. 216 */ 217 int 218 ttyprintf(struct tty *tp, const char *fmt, ...) 219 { 220 va_list ap; 221 struct putchar_arg pca; 222 int retval; 223 224 va_start(ap, fmt); 225 pca.tty = tp; 226 pca.flags = TOTTY; 227 retval = kvprintf(fmt, putchar, &pca, 10, ap); 228 va_end(ap); 229 return (retval); 230 } 231 232 /* 233 * Log writes to the log buffer, and guarantees not to sleep (so can be 234 * called by interrupt routines). If there is no process reading the 235 * log yet, it writes to the console also. 236 */ 237 void 238 log(int level, const char *fmt, ...) 239 { 240 va_list ap; 241 struct putchar_arg pca; 242 243 pca.tty = NULL; 244 pca.pri = level; 245 pca.flags = log_open ? TOLOG : TOCONS; 246 pca.p_bufr = NULL; 247 248 va_start(ap, fmt); 249 kvprintf(fmt, putchar, &pca, 10, ap); 250 va_end(ap); 251 252 msgbuftrigger = 1; 253 } 254 255 #define CONSCHUNK 128 256 257 void 258 log_console(struct uio *uio) 259 { 260 int c, i, error, nl; 261 char *consbuffer; 262 int pri; 263 264 if (!log_console_output) 265 return; 266 267 pri = LOG_INFO | LOG_CONSOLE; 268 uio = cloneuio(uio); 269 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 270 271 nl = 0; 272 while (uio->uio_resid > 0) { 273 c = imin(uio->uio_resid, CONSCHUNK); 274 error = uiomove(consbuffer, c, uio); 275 if (error != 0) 276 break; 277 for (i = 0; i < c; i++) { 278 msglogchar(consbuffer[i], pri); 279 if (consbuffer[i] == '\n') 280 nl = 1; 281 else 282 nl = 0; 283 } 284 } 285 if (!nl) 286 msglogchar('\n', pri); 287 msgbuftrigger = 1; 288 free(uio, M_IOV); 289 free(consbuffer, M_TEMP); 290 return; 291 } 292 293 int 294 printf(const char *fmt, ...) 295 { 296 va_list ap; 297 struct putchar_arg pca; 298 int retval; 299 #ifdef PRINTF_BUFR_SIZE 300 char bufr[PRINTF_BUFR_SIZE]; 301 #endif 302 303 va_start(ap, fmt); 304 pca.tty = NULL; 305 pca.flags = TOCONS | TOLOG; 306 pca.pri = -1; 307 #ifdef PRINTF_BUFR_SIZE 308 pca.p_bufr = bufr; 309 pca.p_next = pca.p_bufr; 310 pca.n_bufr = sizeof(bufr); 311 pca.remain = sizeof(bufr); 312 *pca.p_next = '\0'; 313 #else 314 /* Don't buffer console output. */ 315 pca.p_bufr = NULL; 316 #endif 317 318 retval = kvprintf(fmt, putchar, &pca, 10, ap); 319 va_end(ap); 320 321 #ifdef PRINTF_BUFR_SIZE 322 /* Write any buffered console output: */ 323 if (*pca.p_bufr != '\0') 324 cnputs(pca.p_bufr); 325 #endif 326 327 if (!panicstr) 328 msgbuftrigger = 1; 329 330 return (retval); 331 } 332 333 int 334 vprintf(const char *fmt, va_list ap) 335 { 336 struct putchar_arg pca; 337 int retval; 338 #ifdef PRINTF_BUFR_SIZE 339 char bufr[PRINTF_BUFR_SIZE]; 340 #endif 341 342 pca.tty = NULL; 343 pca.flags = TOCONS | TOLOG; 344 pca.pri = -1; 345 #ifdef PRINTF_BUFR_SIZE 346 pca.p_bufr = bufr; 347 pca.p_next = pca.p_bufr; 348 pca.n_bufr = sizeof(bufr); 349 pca.remain = sizeof(bufr); 350 *pca.p_next = '\0'; 351 #else 352 /* Don't buffer console output. */ 353 pca.p_bufr = NULL; 354 #endif 355 356 retval = kvprintf(fmt, putchar, &pca, 10, ap); 357 358 #ifdef PRINTF_BUFR_SIZE 359 /* Write any buffered console output: */ 360 if (*pca.p_bufr != '\0') 361 cnputs(pca.p_bufr); 362 #endif 363 364 if (!panicstr) 365 msgbuftrigger = 1; 366 367 return (retval); 368 } 369 370 static void 371 putcons(int c, struct putchar_arg *ap) 372 { 373 /* Check if no console output buffer was provided. */ 374 if (ap->p_bufr == NULL) 375 /* Output direct to the console. */ 376 cnputc(c); 377 else { 378 /* Buffer the character: */ 379 if (c == '\n') { 380 *ap->p_next++ = '\r'; 381 ap->remain--; 382 } 383 *ap->p_next++ = c; 384 ap->remain--; 385 386 /* Always leave the buffer zero terminated. */ 387 *ap->p_next = '\0'; 388 389 /* Check if the buffer needs to be flushed. */ 390 if (ap->remain < 3 || c == '\n') { 391 cnputs(ap->p_bufr); 392 ap->p_next = ap->p_bufr; 393 ap->remain = ap->n_bufr; 394 *ap->p_next = '\0'; 395 } 396 } 397 } 398 399 /* 400 * Print a character on console or users terminal. If destination is 401 * the console then the last bunch of characters are saved in msgbuf for 402 * inspection later. 403 */ 404 static void 405 putchar(int c, void *arg) 406 { 407 struct putchar_arg *ap = (struct putchar_arg*) arg; 408 struct tty *tp = ap->tty; 409 int flags = ap->flags; 410 411 /* Don't use the tty code after a panic or while in ddb. */ 412 if (kdb_active) { 413 if (c != '\0') 414 cnputc(c); 415 } else if (panicstr || ((flags & TOCONS) && constty == NULL)) { 416 if (c != '\0') 417 putcons(c, ap); 418 } else { 419 if ((flags & TOTTY) && tp != NULL) 420 tty_putchar(tp, c); 421 if (flags & TOCONS) { 422 if (constty != NULL) 423 msgbuf_addchar(&consmsgbuf, c); 424 if (always_console_output && c != '\0') 425 putcons(c, ap); 426 } 427 } 428 if ((flags & TOLOG)) 429 msglogchar(c, ap->pri); 430 } 431 432 /* 433 * Scaled down version of sprintf(3). 434 */ 435 int 436 sprintf(char *buf, const char *cfmt, ...) 437 { 438 int retval; 439 va_list ap; 440 441 va_start(ap, cfmt); 442 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 443 buf[retval] = '\0'; 444 va_end(ap); 445 return (retval); 446 } 447 448 /* 449 * Scaled down version of vsprintf(3). 450 */ 451 int 452 vsprintf(char *buf, const char *cfmt, va_list ap) 453 { 454 int retval; 455 456 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 457 buf[retval] = '\0'; 458 return (retval); 459 } 460 461 /* 462 * Scaled down version of snprintf(3). 463 */ 464 int 465 snprintf(char *str, size_t size, const char *format, ...) 466 { 467 int retval; 468 va_list ap; 469 470 va_start(ap, format); 471 retval = vsnprintf(str, size, format, ap); 472 va_end(ap); 473 return(retval); 474 } 475 476 /* 477 * Scaled down version of vsnprintf(3). 478 */ 479 int 480 vsnprintf(char *str, size_t size, const char *format, va_list ap) 481 { 482 struct snprintf_arg info; 483 int retval; 484 485 info.str = str; 486 info.remain = size; 487 retval = kvprintf(format, snprintf_func, &info, 10, ap); 488 if (info.remain >= 1) 489 *info.str++ = '\0'; 490 return (retval); 491 } 492 493 /* 494 * Kernel version which takes radix argument vsnprintf(3). 495 */ 496 int 497 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 498 { 499 struct snprintf_arg info; 500 int retval; 501 502 info.str = str; 503 info.remain = size; 504 retval = kvprintf(format, snprintf_func, &info, radix, ap); 505 if (info.remain >= 1) 506 *info.str++ = '\0'; 507 return (retval); 508 } 509 510 static void 511 snprintf_func(int ch, void *arg) 512 { 513 struct snprintf_arg *const info = arg; 514 515 if (info->remain >= 2) { 516 *info->str++ = ch; 517 info->remain--; 518 } 519 } 520 521 /* 522 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 523 * order; return an optional length and a pointer to the last character 524 * written in the buffer (i.e., the first character of the string). 525 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 526 */ 527 static char * 528 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 529 { 530 char *p, c; 531 532 p = nbuf; 533 *p = '\0'; 534 do { 535 c = hex2ascii(num % base); 536 *++p = upper ? toupper(c) : c; 537 } while (num /= base); 538 if (lenp) 539 *lenp = p - nbuf; 540 return (p); 541 } 542 543 /* 544 * Scaled down version of printf(3). 545 * 546 * Two additional formats: 547 * 548 * The format %b is supported to decode error registers. 549 * Its usage is: 550 * 551 * printf("reg=%b\n", regval, "<base><arg>*"); 552 * 553 * where <base> is the output base expressed as a control character, e.g. 554 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 555 * the first of which gives the bit number to be inspected (origin 1), and 556 * the next characters (up to a control character, i.e. a character <= 32), 557 * give the name of the register. Thus: 558 * 559 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 560 * 561 * would produce output: 562 * 563 * reg=3<BITTWO,BITONE> 564 * 565 * XXX: %D -- Hexdump, takes pointer and separator string: 566 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 567 * ("%*D", len, ptr, " " -> XX XX XX XX ... 568 */ 569 int 570 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 571 { 572 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 573 char nbuf[MAXNBUF]; 574 char *d; 575 const char *p, *percent, *q; 576 u_char *up; 577 int ch, n; 578 uintmax_t num; 579 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 580 int cflag, hflag, jflag, tflag, zflag; 581 int dwidth, upper; 582 char padc; 583 int stop = 0, retval = 0; 584 585 num = 0; 586 if (!func) 587 d = (char *) arg; 588 else 589 d = NULL; 590 591 if (fmt == NULL) 592 fmt = "(fmt null)\n"; 593 594 if (radix < 2 || radix > 36) 595 radix = 10; 596 597 for (;;) { 598 padc = ' '; 599 width = 0; 600 while ((ch = (u_char)*fmt++) != '%' || stop) { 601 if (ch == '\0') 602 return (retval); 603 PCHAR(ch); 604 } 605 percent = fmt - 1; 606 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 607 sign = 0; dot = 0; dwidth = 0; upper = 0; 608 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 609 reswitch: switch (ch = (u_char)*fmt++) { 610 case '.': 611 dot = 1; 612 goto reswitch; 613 case '#': 614 sharpflag = 1; 615 goto reswitch; 616 case '+': 617 sign = 1; 618 goto reswitch; 619 case '-': 620 ladjust = 1; 621 goto reswitch; 622 case '%': 623 PCHAR(ch); 624 break; 625 case '*': 626 if (!dot) { 627 width = va_arg(ap, int); 628 if (width < 0) { 629 ladjust = !ladjust; 630 width = -width; 631 } 632 } else { 633 dwidth = va_arg(ap, int); 634 } 635 goto reswitch; 636 case '0': 637 if (!dot) { 638 padc = '0'; 639 goto reswitch; 640 } 641 case '1': case '2': case '3': case '4': 642 case '5': case '6': case '7': case '8': case '9': 643 for (n = 0;; ++fmt) { 644 n = n * 10 + ch - '0'; 645 ch = *fmt; 646 if (ch < '0' || ch > '9') 647 break; 648 } 649 if (dot) 650 dwidth = n; 651 else 652 width = n; 653 goto reswitch; 654 case 'b': 655 num = (u_int)va_arg(ap, int); 656 p = va_arg(ap, char *); 657 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 658 PCHAR(*q--); 659 660 if (num == 0) 661 break; 662 663 for (tmp = 0; *p;) { 664 n = *p++; 665 if (num & (1 << (n - 1))) { 666 PCHAR(tmp ? ',' : '<'); 667 for (; (n = *p) > ' '; ++p) 668 PCHAR(n); 669 tmp = 1; 670 } else 671 for (; *p > ' '; ++p) 672 continue; 673 } 674 if (tmp) 675 PCHAR('>'); 676 break; 677 case 'c': 678 PCHAR(va_arg(ap, int)); 679 break; 680 case 'D': 681 up = va_arg(ap, u_char *); 682 p = va_arg(ap, char *); 683 if (!width) 684 width = 16; 685 while(width--) { 686 PCHAR(hex2ascii(*up >> 4)); 687 PCHAR(hex2ascii(*up & 0x0f)); 688 up++; 689 if (width) 690 for (q=p;*q;q++) 691 PCHAR(*q); 692 } 693 break; 694 case 'd': 695 case 'i': 696 base = 10; 697 sign = 1; 698 goto handle_sign; 699 case 'h': 700 if (hflag) { 701 hflag = 0; 702 cflag = 1; 703 } else 704 hflag = 1; 705 goto reswitch; 706 case 'j': 707 jflag = 1; 708 goto reswitch; 709 case 'l': 710 if (lflag) { 711 lflag = 0; 712 qflag = 1; 713 } else 714 lflag = 1; 715 goto reswitch; 716 case 'n': 717 if (jflag) 718 *(va_arg(ap, intmax_t *)) = retval; 719 else if (qflag) 720 *(va_arg(ap, quad_t *)) = retval; 721 else if (lflag) 722 *(va_arg(ap, long *)) = retval; 723 else if (zflag) 724 *(va_arg(ap, size_t *)) = retval; 725 else if (hflag) 726 *(va_arg(ap, short *)) = retval; 727 else if (cflag) 728 *(va_arg(ap, char *)) = retval; 729 else 730 *(va_arg(ap, int *)) = retval; 731 break; 732 case 'o': 733 base = 8; 734 goto handle_nosign; 735 case 'p': 736 base = 16; 737 sharpflag = (width == 0); 738 sign = 0; 739 num = (uintptr_t)va_arg(ap, void *); 740 goto number; 741 case 'q': 742 qflag = 1; 743 goto reswitch; 744 case 'r': 745 base = radix; 746 if (sign) 747 goto handle_sign; 748 goto handle_nosign; 749 case 's': 750 p = va_arg(ap, char *); 751 if (p == NULL) 752 p = "(null)"; 753 if (!dot) 754 n = strlen (p); 755 else 756 for (n = 0; n < dwidth && p[n]; n++) 757 continue; 758 759 width -= n; 760 761 if (!ladjust && width > 0) 762 while (width--) 763 PCHAR(padc); 764 while (n--) 765 PCHAR(*p++); 766 if (ladjust && width > 0) 767 while (width--) 768 PCHAR(padc); 769 break; 770 case 't': 771 tflag = 1; 772 goto reswitch; 773 case 'u': 774 base = 10; 775 goto handle_nosign; 776 case 'X': 777 upper = 1; 778 case 'x': 779 base = 16; 780 goto handle_nosign; 781 case 'y': 782 base = 16; 783 sign = 1; 784 goto handle_sign; 785 case 'z': 786 zflag = 1; 787 goto reswitch; 788 handle_nosign: 789 sign = 0; 790 if (jflag) 791 num = va_arg(ap, uintmax_t); 792 else if (qflag) 793 num = va_arg(ap, u_quad_t); 794 else if (tflag) 795 num = va_arg(ap, ptrdiff_t); 796 else if (lflag) 797 num = va_arg(ap, u_long); 798 else if (zflag) 799 num = va_arg(ap, size_t); 800 else if (hflag) 801 num = (u_short)va_arg(ap, int); 802 else if (cflag) 803 num = (u_char)va_arg(ap, int); 804 else 805 num = va_arg(ap, u_int); 806 goto number; 807 handle_sign: 808 if (jflag) 809 num = va_arg(ap, intmax_t); 810 else if (qflag) 811 num = va_arg(ap, quad_t); 812 else if (tflag) 813 num = va_arg(ap, ptrdiff_t); 814 else if (lflag) 815 num = va_arg(ap, long); 816 else if (zflag) 817 num = va_arg(ap, ssize_t); 818 else if (hflag) 819 num = (short)va_arg(ap, int); 820 else if (cflag) 821 num = (char)va_arg(ap, int); 822 else 823 num = va_arg(ap, int); 824 number: 825 if (sign && (intmax_t)num < 0) { 826 neg = 1; 827 num = -(intmax_t)num; 828 } 829 p = ksprintn(nbuf, num, base, &tmp, upper); 830 if (sharpflag && num != 0) { 831 if (base == 8) 832 tmp++; 833 else if (base == 16) 834 tmp += 2; 835 } 836 if (neg) 837 tmp++; 838 839 if (!ladjust && padc != '0' && width 840 && (width -= tmp) > 0) 841 while (width--) 842 PCHAR(padc); 843 if (neg) 844 PCHAR('-'); 845 if (sharpflag && num != 0) { 846 if (base == 8) { 847 PCHAR('0'); 848 } else if (base == 16) { 849 PCHAR('0'); 850 PCHAR('x'); 851 } 852 } 853 if (!ladjust && width && (width -= tmp) > 0) 854 while (width--) 855 PCHAR(padc); 856 857 while (*p) 858 PCHAR(*p--); 859 860 if (ladjust && width && (width -= tmp) > 0) 861 while (width--) 862 PCHAR(padc); 863 864 break; 865 default: 866 while (percent < fmt) 867 PCHAR(*percent++); 868 /* 869 * Since we ignore an formatting argument it is no 870 * longer safe to obey the remaining formatting 871 * arguments as the arguments will no longer match 872 * the format specs. 873 */ 874 stop = 1; 875 break; 876 } 877 } 878 #undef PCHAR 879 } 880 881 /* 882 * Put character in log buffer with a particular priority. 883 */ 884 static void 885 msglogchar(int c, int pri) 886 { 887 static int lastpri = -1; 888 static int dangling; 889 char nbuf[MAXNBUF]; 890 char *p; 891 892 if (!msgbufmapped) 893 return; 894 if (c == '\0' || c == '\r') 895 return; 896 if (pri != -1 && pri != lastpri) { 897 if (dangling) { 898 msgbuf_addchar(msgbufp, '\n'); 899 dangling = 0; 900 } 901 msgbuf_addchar(msgbufp, '<'); 902 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 903 msgbuf_addchar(msgbufp, *p--); 904 msgbuf_addchar(msgbufp, '>'); 905 lastpri = pri; 906 } 907 msgbuf_addchar(msgbufp, c); 908 if (c == '\n') { 909 dangling = 0; 910 lastpri = -1; 911 } else { 912 dangling = 1; 913 } 914 } 915 916 void 917 msgbufinit(void *ptr, int size) 918 { 919 char *cp; 920 static struct msgbuf *oldp = NULL; 921 922 size -= sizeof(*msgbufp); 923 cp = (char *)ptr; 924 msgbufp = (struct msgbuf *)(cp + size); 925 msgbuf_reinit(msgbufp, cp, size); 926 if (msgbufmapped && oldp != msgbufp) 927 msgbuf_copy(oldp, msgbufp); 928 msgbufmapped = 1; 929 oldp = msgbufp; 930 } 931 932 static int unprivileged_read_msgbuf = 1; 933 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 934 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 935 "Unprivileged processes may read the kernel message buffer"); 936 937 /* Sysctls for accessing/clearing the msgbuf */ 938 static int 939 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 940 { 941 char buf[128]; 942 u_int seq; 943 int error, len; 944 945 if (!unprivileged_read_msgbuf) { 946 error = priv_check(req->td, PRIV_MSGBUF); 947 if (error) 948 return (error); 949 } 950 951 /* Read the whole buffer, one chunk at a time. */ 952 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 953 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 954 error = sysctl_handle_opaque(oidp, buf, len, req); 955 if (error) 956 return (error); 957 } 958 return (0); 959 } 960 961 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 962 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 963 964 static int msgbuf_clearflag; 965 966 static int 967 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 968 { 969 int error; 970 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 971 if (!error && req->newptr) { 972 msgbuf_clear(msgbufp); 973 msgbuf_clearflag = 0; 974 } 975 return (error); 976 } 977 978 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 979 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 980 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 981 982 #ifdef DDB 983 984 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 985 { 986 int i, j; 987 988 if (!msgbufmapped) { 989 db_printf("msgbuf not mapped yet\n"); 990 return; 991 } 992 db_printf("msgbufp = %p\n", msgbufp); 993 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 994 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 995 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 996 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 997 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 998 db_printf("%c", msgbufp->msg_ptr[j]); 999 } 1000 db_printf("\n"); 1001 } 1002 1003 #endif /* DDB */ 1004 1005 void 1006 hexdump(const void *ptr, int length, const char *hdr, int flags) 1007 { 1008 int i, j, k; 1009 int cols; 1010 const unsigned char *cp; 1011 char delim; 1012 1013 if ((flags & HD_DELIM_MASK) != 0) 1014 delim = (flags & HD_DELIM_MASK) >> 8; 1015 else 1016 delim = ' '; 1017 1018 if ((flags & HD_COLUMN_MASK) != 0) 1019 cols = flags & HD_COLUMN_MASK; 1020 else 1021 cols = 16; 1022 1023 cp = ptr; 1024 for (i = 0; i < length; i+= cols) { 1025 if (hdr != NULL) 1026 printf("%s", hdr); 1027 1028 if ((flags & HD_OMIT_COUNT) == 0) 1029 printf("%04x ", i); 1030 1031 if ((flags & HD_OMIT_HEX) == 0) { 1032 for (j = 0; j < cols; j++) { 1033 k = i + j; 1034 if (k < length) 1035 printf("%c%02x", delim, cp[k]); 1036 else 1037 printf(" "); 1038 } 1039 } 1040 1041 if ((flags & HD_OMIT_CHARS) == 0) { 1042 printf(" |"); 1043 for (j = 0; j < cols; j++) { 1044 k = i + j; 1045 if (k >= length) 1046 printf(" "); 1047 else if (cp[k] >= ' ' && cp[k] <= '~') 1048 printf("%c", cp[k]); 1049 else 1050 printf("."); 1051 } 1052 printf("|"); 1053 } 1054 printf("\n"); 1055 } 1056 } 1057 1058