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