39 40#ifdef _KERNEL 41#include "opt_ddb.h" 42#include "opt_printf.h" 43#endif /* _KERNEL */ 44 45#include <sys/param.h> 46#ifdef _KERNEL 47#include <sys/systm.h> 48#include <sys/lock.h> 49#include <sys/kdb.h> 50#include <sys/mutex.h> 51#include <sys/sx.h> 52#include <sys/kernel.h> 53#include <sys/msgbuf.h> 54#include <sys/malloc.h> 55#include <sys/priv.h> 56#include <sys/proc.h> 57#include <sys/stddef.h> 58#include <sys/sysctl.h> 59#include <sys/tty.h> 60#include <sys/syslog.h> 61#include <sys/cons.h> 62#include <sys/uio.h> 63#endif 64#include <sys/ctype.h> 65#include <sys/sbuf.h> 66 67#ifdef DDB 68#include <ddb/ddb.h> 69#endif 70 71/* 72 * Note that stdarg.h and the ANSI style va_start macro is used for both 73 * ANSI and traditional C compilers. 74 */ 75#include <machine/stdarg.h> 76 77#ifdef _KERNEL 78 79#define TOCONS 0x01 80#define TOTTY 0x02 81#define TOLOG 0x04 82 83/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 84#define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 85 86struct putchar_arg { 87 int flags; 88 int pri; 89 struct tty *tty; 90 char *p_bufr; 91 size_t n_bufr; 92 char *p_next; 93 size_t remain; 94}; 95 96struct snprintf_arg { 97 char *str; 98 size_t remain; 99}; 100 101extern int log_open; 102 103static void msglogchar(int c, int pri); 104static void msglogstr(char *str, int pri, int filter_cr); 105static void putchar(int ch, void *arg); 106static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper); 107static void snprintf_func(int ch, void *arg); 108 109static int msgbufmapped; /* Set when safe to use msgbuf */ 110int msgbuftrigger; 111 112static int log_console_output = 1; 113SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RWTUN, 114 &log_console_output, 0, "Duplicate console output to the syslog"); 115 116/* 117 * See the comment in log_console() below for more explanation of this. 118 */ 119static int log_console_add_linefeed; 120SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RWTUN, 121 &log_console_add_linefeed, 0, "log_console() adds extra newlines"); 122 123static int always_console_output; 124SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RWTUN, 125 &always_console_output, 0, "Always output to console despite TIOCCONS"); 126 127/* 128 * Warn that a system table is full. 129 */ 130void 131tablefull(const char *tab) 132{ 133 134 log(LOG_ERR, "%s: table is full\n", tab); 135} 136 137/* 138 * Uprintf prints to the controlling terminal for the current process. 139 */ 140int 141uprintf(const char *fmt, ...) 142{ 143 va_list ap; 144 struct putchar_arg pca; 145 struct proc *p; 146 struct thread *td; 147 int retval; 148 149 td = curthread; 150 if (TD_IS_IDLETHREAD(td)) 151 return (0); 152 153 sx_slock(&proctree_lock); 154 p = td->td_proc; 155 PROC_LOCK(p); 156 if ((p->p_flag & P_CONTROLT) == 0) { 157 PROC_UNLOCK(p); 158 sx_sunlock(&proctree_lock); 159 return (0); 160 } 161 SESS_LOCK(p->p_session); 162 pca.tty = p->p_session->s_ttyp; 163 SESS_UNLOCK(p->p_session); 164 PROC_UNLOCK(p); 165 if (pca.tty == NULL) { 166 sx_sunlock(&proctree_lock); 167 return (0); 168 } 169 pca.flags = TOTTY; 170 pca.p_bufr = NULL; 171 va_start(ap, fmt); 172 tty_lock(pca.tty); 173 sx_sunlock(&proctree_lock); 174 retval = kvprintf(fmt, putchar, &pca, 10, ap); 175 tty_unlock(pca.tty); 176 va_end(ap); 177 return (retval); 178} 179 180/* 181 * tprintf and vtprintf print on the controlling terminal associated with the 182 * given session, possibly to the log as well. 183 */ 184void 185tprintf(struct proc *p, int pri, const char *fmt, ...) 186{ 187 va_list ap; 188 189 va_start(ap, fmt); 190 vtprintf(p, pri, fmt, ap); 191 va_end(ap); 192} 193 194void 195vtprintf(struct proc *p, int pri, const char *fmt, va_list ap) 196{ 197 struct tty *tp = NULL; 198 int flags = 0; 199 struct putchar_arg pca; 200 struct session *sess = NULL; 201 202 sx_slock(&proctree_lock); 203 if (pri != -1) 204 flags |= TOLOG; 205 if (p != NULL) { 206 PROC_LOCK(p); 207 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 208 sess = p->p_session; 209 sess_hold(sess); 210 PROC_UNLOCK(p); 211 tp = sess->s_ttyp; 212 if (tp != NULL && tty_checkoutq(tp)) 213 flags |= TOTTY; 214 else 215 tp = NULL; 216 } else 217 PROC_UNLOCK(p); 218 } 219 pca.pri = pri; 220 pca.tty = tp; 221 pca.flags = flags; 222 pca.p_bufr = NULL; 223 if (pca.tty != NULL) 224 tty_lock(pca.tty); 225 sx_sunlock(&proctree_lock); 226 kvprintf(fmt, putchar, &pca, 10, ap); 227 if (pca.tty != NULL) 228 tty_unlock(pca.tty); 229 if (sess != NULL) 230 sess_release(sess); 231 msgbuftrigger = 1; 232} 233 234/* 235 * Ttyprintf displays a message on a tty; it should be used only by 236 * the tty driver, or anything that knows the underlying tty will not 237 * be revoke(2)'d away. Other callers should use tprintf. 238 */ 239int 240ttyprintf(struct tty *tp, const char *fmt, ...) 241{ 242 va_list ap; 243 struct putchar_arg pca; 244 int retval; 245 246 va_start(ap, fmt); 247 pca.tty = tp; 248 pca.flags = TOTTY; 249 pca.p_bufr = NULL; 250 retval = kvprintf(fmt, putchar, &pca, 10, ap); 251 va_end(ap); 252 return (retval); 253} 254 255static int 256_vprintf(int level, int flags, const char *fmt, va_list ap) 257{ 258 struct putchar_arg pca; 259 int retval; 260#ifdef PRINTF_BUFR_SIZE 261 char bufr[PRINTF_BUFR_SIZE]; 262#endif 263 264 pca.tty = NULL; 265 pca.pri = level; 266 pca.flags = flags; 267#ifdef PRINTF_BUFR_SIZE 268 pca.p_bufr = bufr; 269 pca.p_next = pca.p_bufr; 270 pca.n_bufr = sizeof(bufr); 271 pca.remain = sizeof(bufr); 272 *pca.p_next = '\0'; 273#else 274 /* Don't buffer console output. */ 275 pca.p_bufr = NULL; 276#endif 277 278 retval = kvprintf(fmt, putchar, &pca, 10, ap); 279 280#ifdef PRINTF_BUFR_SIZE 281 /* Write any buffered console/log output: */ 282 if (*pca.p_bufr != '\0') { 283 if (pca.flags & TOLOG) 284 msglogstr(pca.p_bufr, level, /*filter_cr*/1); 285 286 if (pca.flags & TOCONS) 287 cnputs(pca.p_bufr); 288 } 289#endif 290 291 return (retval); 292} 293 294/* 295 * Log writes to the log buffer, and guarantees not to sleep (so can be 296 * called by interrupt routines). If there is no process reading the 297 * log yet, it writes to the console also. 298 */ 299void 300log(int level, const char *fmt, ...) 301{ 302 va_list ap; 303 304 va_start(ap, fmt); 305 vlog(level, fmt, ap); 306 va_end(ap); 307} 308 309void 310vlog(int level, const char *fmt, va_list ap) 311{ 312 313 (void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap); 314 msgbuftrigger = 1; 315} 316 317#define CONSCHUNK 128 318 319void 320log_console(struct uio *uio) 321{ 322 int c, error, nl; 323 char *consbuffer; 324 int pri; 325 326 if (!log_console_output) 327 return; 328 329 pri = LOG_INFO | LOG_CONSOLE; 330 uio = cloneuio(uio); 331 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 332 333 nl = 0; 334 while (uio->uio_resid > 0) { 335 c = imin(uio->uio_resid, CONSCHUNK - 1); 336 error = uiomove(consbuffer, c, uio); 337 if (error != 0) 338 break; 339 /* Make sure we're NUL-terminated */ 340 consbuffer[c] = '\0'; 341 if (consbuffer[c - 1] == '\n') 342 nl = 1; 343 else 344 nl = 0; 345 msglogstr(consbuffer, pri, /*filter_cr*/ 1); 346 } 347 /* 348 * The previous behavior in log_console() is preserved when 349 * log_console_add_linefeed is non-zero. For that behavior, if an 350 * individual console write came in that was not terminated with a 351 * line feed, it would add a line feed. 352 * 353 * This results in different data in the message buffer than 354 * appears on the system console (which doesn't add extra line feed 355 * characters). 356 * 357 * A number of programs and rc scripts write a line feed, or a period 358 * and a line feed when they have completed their operation. On 359 * the console, this looks seamless, but when displayed with 360 * 'dmesg -a', you wind up with output that looks like this: 361 * 362 * Updating motd: 363 * . 364 * 365 * On the console, it looks like this: 366 * Updating motd:. 367 * 368 * We could add logic to detect that situation, or just not insert 369 * the extra newlines. Set the kern.log_console_add_linefeed 370 * sysctl/tunable variable to get the old behavior. 371 */ 372 if (!nl && log_console_add_linefeed) { 373 consbuffer[0] = '\n'; 374 consbuffer[1] = '\0'; 375 msglogstr(consbuffer, pri, /*filter_cr*/ 1); 376 } 377 msgbuftrigger = 1; 378 free(uio, M_IOV); 379 free(consbuffer, M_TEMP); 380 return; 381} 382 383int 384printf(const char *fmt, ...) 385{ 386 va_list ap; 387 int retval; 388 389 va_start(ap, fmt); 390 retval = vprintf(fmt, ap); 391 va_end(ap); 392 393 return (retval); 394} 395 396int 397vprintf(const char *fmt, va_list ap) 398{ 399 int retval; 400 401 retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap); 402 403 if (!panicstr) 404 msgbuftrigger = 1; 405 406 return (retval); 407} 408 409static void 410putbuf(int c, struct putchar_arg *ap) 411{ 412 /* Check if no console output buffer was provided. */ 413 if (ap->p_bufr == NULL) { 414 /* Output direct to the console. */ 415 if (ap->flags & TOCONS) 416 cnputc(c); 417 418 if (ap->flags & TOLOG) 419 msglogchar(c, ap->pri); 420 } else { 421 /* Buffer the character: */ 422 *ap->p_next++ = c; 423 ap->remain--; 424 425 /* Always leave the buffer zero terminated. */ 426 *ap->p_next = '\0'; 427 428 /* Check if the buffer needs to be flushed. */ 429 if (ap->remain == 2 || c == '\n') { 430 431 if (ap->flags & TOLOG) 432 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1); 433 434 if (ap->flags & TOCONS) { 435 if ((panicstr == NULL) && (constty != NULL)) 436 msgbuf_addstr(&consmsgbuf, -1, 437 ap->p_bufr, /*filter_cr*/ 0); 438 439 if ((constty == NULL) ||(always_console_output)) 440 cnputs(ap->p_bufr); 441 } 442 443 ap->p_next = ap->p_bufr; 444 ap->remain = ap->n_bufr; 445 *ap->p_next = '\0'; 446 } 447 448 /* 449 * Since we fill the buffer up one character at a time, 450 * this should not happen. We should always catch it when 451 * ap->remain == 2 (if not sooner due to a newline), flush 452 * the buffer and move on. One way this could happen is 453 * if someone sets PRINTF_BUFR_SIZE to 1 or something 454 * similarly silly. 455 */ 456 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd", 457 ap->remain)); 458 } 459} 460 461/* 462 * Print a character on console or users terminal. If destination is 463 * the console then the last bunch of characters are saved in msgbuf for 464 * inspection later. 465 */ 466static void 467putchar(int c, void *arg) 468{ 469 struct putchar_arg *ap = (struct putchar_arg*) arg; 470 struct tty *tp = ap->tty; 471 int flags = ap->flags; 472 473 /* Don't use the tty code after a panic or while in ddb. */ 474 if (kdb_active) { 475 if (c != '\0') 476 cnputc(c); 477 return; 478 } 479 480 if ((flags & TOTTY) && tp != NULL && panicstr == NULL) 481 tty_putchar(tp, c); 482 483 if ((flags & (TOCONS | TOLOG)) && c != '\0') 484 putbuf(c, ap); 485} 486 487/* 488 * Scaled down version of sprintf(3). 489 */ 490int 491sprintf(char *buf, const char *cfmt, ...) 492{ 493 int retval; 494 va_list ap; 495 496 va_start(ap, cfmt); 497 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 498 buf[retval] = '\0'; 499 va_end(ap); 500 return (retval); 501} 502 503/* 504 * Scaled down version of vsprintf(3). 505 */ 506int 507vsprintf(char *buf, const char *cfmt, va_list ap) 508{ 509 int retval; 510 511 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 512 buf[retval] = '\0'; 513 return (retval); 514} 515 516/* 517 * Scaled down version of snprintf(3). 518 */ 519int 520snprintf(char *str, size_t size, const char *format, ...) 521{ 522 int retval; 523 va_list ap; 524 525 va_start(ap, format); 526 retval = vsnprintf(str, size, format, ap); 527 va_end(ap); 528 return(retval); 529} 530 531/* 532 * Scaled down version of vsnprintf(3). 533 */ 534int 535vsnprintf(char *str, size_t size, const char *format, va_list ap) 536{ 537 struct snprintf_arg info; 538 int retval; 539 540 info.str = str; 541 info.remain = size; 542 retval = kvprintf(format, snprintf_func, &info, 10, ap); 543 if (info.remain >= 1) 544 *info.str++ = '\0'; 545 return (retval); 546} 547 548/* 549 * Kernel version which takes radix argument vsnprintf(3). 550 */ 551int 552vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 553{ 554 struct snprintf_arg info; 555 int retval; 556 557 info.str = str; 558 info.remain = size; 559 retval = kvprintf(format, snprintf_func, &info, radix, ap); 560 if (info.remain >= 1) 561 *info.str++ = '\0'; 562 return (retval); 563} 564 565static void 566snprintf_func(int ch, void *arg) 567{ 568 struct snprintf_arg *const info = arg; 569 570 if (info->remain >= 2) { 571 *info->str++ = ch; 572 info->remain--; 573 } 574} 575 576/* 577 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 578 * order; return an optional length and a pointer to the last character 579 * written in the buffer (i.e., the first character of the string). 580 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 581 */ 582static char * 583ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 584{ 585 char *p, c; 586 587 p = nbuf; 588 *p = '\0'; 589 do { 590 c = hex2ascii(num % base); 591 *++p = upper ? toupper(c) : c; 592 } while (num /= base); 593 if (lenp) 594 *lenp = p - nbuf; 595 return (p); 596} 597 598/* 599 * Scaled down version of printf(3). 600 * 601 * Two additional formats: 602 * 603 * The format %b is supported to decode error registers. 604 * Its usage is: 605 * 606 * printf("reg=%b\n", regval, "<base><arg>*"); 607 * 608 * where <base> is the output base expressed as a control character, e.g. 609 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 610 * the first of which gives the bit number to be inspected (origin 1), and 611 * the next characters (up to a control character, i.e. a character <= 32), 612 * give the name of the register. Thus: 613 * 614 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE"); 615 * 616 * would produce output: 617 * 618 * reg=3<BITTWO,BITONE> 619 * 620 * XXX: %D -- Hexdump, takes pointer and separator string: 621 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 622 * ("%*D", len, ptr, " " -> XX XX XX XX ... 623 */ 624int 625kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 626{ 627#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 628 char nbuf[MAXNBUF]; 629 char *d; 630 const char *p, *percent, *q; 631 u_char *up; 632 int ch, n; 633 uintmax_t num; 634 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 635 int cflag, hflag, jflag, tflag, zflag; 636 int dwidth, upper; 637 char padc; 638 int stop = 0, retval = 0; 639 640 num = 0; 641 if (!func) 642 d = (char *) arg; 643 else 644 d = NULL; 645 646 if (fmt == NULL) 647 fmt = "(fmt null)\n"; 648 649 if (radix < 2 || radix > 36) 650 radix = 10; 651 652 for (;;) { 653 padc = ' '; 654 width = 0; 655 while ((ch = (u_char)*fmt++) != '%' || stop) { 656 if (ch == '\0') 657 return (retval); 658 PCHAR(ch); 659 } 660 percent = fmt - 1; 661 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 662 sign = 0; dot = 0; dwidth = 0; upper = 0; 663 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 664reswitch: switch (ch = (u_char)*fmt++) { 665 case '.': 666 dot = 1; 667 goto reswitch; 668 case '#': 669 sharpflag = 1; 670 goto reswitch; 671 case '+': 672 sign = 1; 673 goto reswitch; 674 case '-': 675 ladjust = 1; 676 goto reswitch; 677 case '%': 678 PCHAR(ch); 679 break; 680 case '*': 681 if (!dot) { 682 width = va_arg(ap, int); 683 if (width < 0) { 684 ladjust = !ladjust; 685 width = -width; 686 } 687 } else { 688 dwidth = va_arg(ap, int); 689 } 690 goto reswitch; 691 case '0': 692 if (!dot) { 693 padc = '0'; 694 goto reswitch; 695 } 696 case '1': case '2': case '3': case '4': 697 case '5': case '6': case '7': case '8': case '9': 698 for (n = 0;; ++fmt) { 699 n = n * 10 + ch - '0'; 700 ch = *fmt; 701 if (ch < '0' || ch > '9') 702 break; 703 } 704 if (dot) 705 dwidth = n; 706 else 707 width = n; 708 goto reswitch; 709 case 'b': 710 num = (u_int)va_arg(ap, int); 711 p = va_arg(ap, char *); 712 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 713 PCHAR(*q--); 714 715 if (num == 0) 716 break; 717 718 for (tmp = 0; *p;) { 719 n = *p++; 720 if (num & (1 << (n - 1))) { 721 PCHAR(tmp ? ',' : '<'); 722 for (; (n = *p) > ' '; ++p) 723 PCHAR(n); 724 tmp = 1; 725 } else 726 for (; *p > ' '; ++p) 727 continue; 728 } 729 if (tmp) 730 PCHAR('>'); 731 break; 732 case 'c': 733 width -= 1; 734 735 if (!ladjust && width > 0) 736 while (width--) 737 PCHAR(padc); 738 PCHAR(va_arg(ap, int)); 739 if (ladjust && width > 0) 740 while (width--) 741 PCHAR(padc); 742 break; 743 case 'D': 744 up = va_arg(ap, u_char *); 745 p = va_arg(ap, char *); 746 if (!width) 747 width = 16; 748 while(width--) { 749 PCHAR(hex2ascii(*up >> 4)); 750 PCHAR(hex2ascii(*up & 0x0f)); 751 up++; 752 if (width) 753 for (q=p;*q;q++) 754 PCHAR(*q); 755 } 756 break; 757 case 'd': 758 case 'i': 759 base = 10; 760 sign = 1; 761 goto handle_sign; 762 case 'h': 763 if (hflag) { 764 hflag = 0; 765 cflag = 1; 766 } else 767 hflag = 1; 768 goto reswitch; 769 case 'j': 770 jflag = 1; 771 goto reswitch; 772 case 'l': 773 if (lflag) { 774 lflag = 0; 775 qflag = 1; 776 } else 777 lflag = 1; 778 goto reswitch; 779 case 'n': 780 if (jflag) 781 *(va_arg(ap, intmax_t *)) = retval; 782 else if (qflag) 783 *(va_arg(ap, quad_t *)) = retval; 784 else if (lflag) 785 *(va_arg(ap, long *)) = retval; 786 else if (zflag) 787 *(va_arg(ap, size_t *)) = retval; 788 else if (hflag) 789 *(va_arg(ap, short *)) = retval; 790 else if (cflag) 791 *(va_arg(ap, char *)) = retval; 792 else 793 *(va_arg(ap, int *)) = retval; 794 break; 795 case 'o': 796 base = 8; 797 goto handle_nosign; 798 case 'p': 799 base = 16; 800 sharpflag = (width == 0); 801 sign = 0; 802 num = (uintptr_t)va_arg(ap, void *); 803 goto number; 804 case 'q': 805 qflag = 1; 806 goto reswitch; 807 case 'r': 808 base = radix; 809 if (sign) 810 goto handle_sign; 811 goto handle_nosign; 812 case 's': 813 p = va_arg(ap, char *); 814 if (p == NULL) 815 p = "(null)"; 816 if (!dot) 817 n = strlen (p); 818 else 819 for (n = 0; n < dwidth && p[n]; n++) 820 continue; 821 822 width -= n; 823 824 if (!ladjust && width > 0) 825 while (width--) 826 PCHAR(padc); 827 while (n--) 828 PCHAR(*p++); 829 if (ladjust && width > 0) 830 while (width--) 831 PCHAR(padc); 832 break; 833 case 't': 834 tflag = 1; 835 goto reswitch; 836 case 'u': 837 base = 10; 838 goto handle_nosign; 839 case 'X': 840 upper = 1; 841 case 'x': 842 base = 16; 843 goto handle_nosign; 844 case 'y': 845 base = 16; 846 sign = 1; 847 goto handle_sign; 848 case 'z': 849 zflag = 1; 850 goto reswitch; 851handle_nosign: 852 sign = 0; 853 if (jflag) 854 num = va_arg(ap, uintmax_t); 855 else if (qflag) 856 num = va_arg(ap, u_quad_t); 857 else if (tflag) 858 num = va_arg(ap, ptrdiff_t); 859 else if (lflag) 860 num = va_arg(ap, u_long); 861 else if (zflag) 862 num = va_arg(ap, size_t); 863 else if (hflag) 864 num = (u_short)va_arg(ap, int); 865 else if (cflag) 866 num = (u_char)va_arg(ap, int); 867 else 868 num = va_arg(ap, u_int); 869 goto number; 870handle_sign: 871 if (jflag) 872 num = va_arg(ap, intmax_t); 873 else if (qflag) 874 num = va_arg(ap, quad_t); 875 else if (tflag) 876 num = va_arg(ap, ptrdiff_t); 877 else if (lflag) 878 num = va_arg(ap, long); 879 else if (zflag) 880 num = va_arg(ap, ssize_t); 881 else if (hflag) 882 num = (short)va_arg(ap, int); 883 else if (cflag) 884 num = (char)va_arg(ap, int); 885 else 886 num = va_arg(ap, int); 887number: 888 if (sign && (intmax_t)num < 0) { 889 neg = 1; 890 num = -(intmax_t)num; 891 } 892 p = ksprintn(nbuf, num, base, &n, upper); 893 tmp = 0; 894 if (sharpflag && num != 0) { 895 if (base == 8) 896 tmp++; 897 else if (base == 16) 898 tmp += 2; 899 } 900 if (neg) 901 tmp++; 902 903 if (!ladjust && padc == '0') 904 dwidth = width - tmp; 905 width -= tmp + imax(dwidth, n); 906 dwidth -= n; 907 if (!ladjust) 908 while (width-- > 0) 909 PCHAR(' '); 910 if (neg) 911 PCHAR('-'); 912 if (sharpflag && num != 0) { 913 if (base == 8) { 914 PCHAR('0'); 915 } else if (base == 16) { 916 PCHAR('0'); 917 PCHAR('x'); 918 } 919 } 920 while (dwidth-- > 0) 921 PCHAR('0'); 922 923 while (*p) 924 PCHAR(*p--); 925 926 if (ladjust) 927 while (width-- > 0) 928 PCHAR(' '); 929 930 break; 931 default: 932 while (percent < fmt) 933 PCHAR(*percent++); 934 /* 935 * Since we ignore a formatting argument it is no 936 * longer safe to obey the remaining formatting 937 * arguments as the arguments will no longer match 938 * the format specs. 939 */ 940 stop = 1; 941 break; 942 } 943 } 944#undef PCHAR 945} 946 947/* 948 * Put character in log buffer with a particular priority. 949 */ 950static void 951msglogchar(int c, int pri) 952{ 953 static int lastpri = -1; 954 static int dangling; 955 char nbuf[MAXNBUF]; 956 char *p; 957 958 if (!msgbufmapped) 959 return; 960 if (c == '\0' || c == '\r') 961 return; 962 if (pri != -1 && pri != lastpri) { 963 if (dangling) { 964 msgbuf_addchar(msgbufp, '\n'); 965 dangling = 0; 966 } 967 msgbuf_addchar(msgbufp, '<'); 968 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 969 msgbuf_addchar(msgbufp, *p--); 970 msgbuf_addchar(msgbufp, '>'); 971 lastpri = pri; 972 } 973 msgbuf_addchar(msgbufp, c); 974 if (c == '\n') { 975 dangling = 0; 976 lastpri = -1; 977 } else { 978 dangling = 1; 979 } 980} 981 982static void 983msglogstr(char *str, int pri, int filter_cr) 984{ 985 if (!msgbufmapped) 986 return; 987 988 msgbuf_addstr(msgbufp, pri, str, filter_cr); 989} 990 991void 992msgbufinit(void *ptr, int size) 993{ 994 char *cp; 995 static struct msgbuf *oldp = NULL; 996 997 size -= sizeof(*msgbufp); 998 cp = (char *)ptr; 999 msgbufp = (struct msgbuf *)(cp + size); 1000 msgbuf_reinit(msgbufp, cp, size); 1001 if (msgbufmapped && oldp != msgbufp) 1002 msgbuf_copy(oldp, msgbufp); 1003 msgbufmapped = 1; 1004 oldp = msgbufp; 1005} 1006 1007static int unprivileged_read_msgbuf = 1; 1008SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 1009 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 1010 "Unprivileged processes may read the kernel message buffer"); 1011 1012/* Sysctls for accessing/clearing the msgbuf */ 1013static int 1014sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 1015{ 1016 char buf[128]; 1017 u_int seq; 1018 int error, len; 1019 1020 if (!unprivileged_read_msgbuf) { 1021 error = priv_check(req->td, PRIV_MSGBUF); 1022 if (error) 1023 return (error); 1024 } 1025 1026 /* Read the whole buffer, one chunk at a time. */ 1027 mtx_lock(&msgbuf_lock); 1028 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 1029 for (;;) { 1030 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq); 1031 mtx_unlock(&msgbuf_lock); 1032 if (len == 0) 1033 return (SYSCTL_OUT(req, "", 1)); /* add nulterm */ 1034 1035 error = sysctl_handle_opaque(oidp, buf, len, req); 1036 if (error) 1037 return (error); 1038 1039 mtx_lock(&msgbuf_lock); 1040 } 1041} 1042 1043SYSCTL_PROC(_kern, OID_AUTO, msgbuf, 1044 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 1045 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 1046 1047static int msgbuf_clearflag; 1048 1049static int 1050sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 1051{ 1052 int error; 1053 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 1054 if (!error && req->newptr) { 1055 mtx_lock(&msgbuf_lock); 1056 msgbuf_clear(msgbufp); 1057 mtx_unlock(&msgbuf_lock); 1058 msgbuf_clearflag = 0; 1059 } 1060 return (error); 1061} 1062 1063SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 1064 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, 1065 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I", 1066 "Clear kernel message buffer"); 1067 1068#ifdef DDB 1069 1070DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 1071{ 1072 int i, j; 1073 1074 if (!msgbufmapped) { 1075 db_printf("msgbuf not mapped yet\n"); 1076 return; 1077 } 1078 db_printf("msgbufp = %p\n", msgbufp); 1079 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 1080 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 1081 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 1082 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 1083 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 1084 db_printf("%c", msgbufp->msg_ptr[j]); 1085 } 1086 db_printf("\n"); 1087} 1088 1089#endif /* DDB */ 1090 1091void 1092hexdump(const void *ptr, int length, const char *hdr, int flags) 1093{ 1094 int i, j, k; 1095 int cols; 1096 const unsigned char *cp; 1097 char delim; 1098 1099 if ((flags & HD_DELIM_MASK) != 0) 1100 delim = (flags & HD_DELIM_MASK) >> 8; 1101 else 1102 delim = ' '; 1103 1104 if ((flags & HD_COLUMN_MASK) != 0) 1105 cols = flags & HD_COLUMN_MASK; 1106 else 1107 cols = 16; 1108 1109 cp = ptr; 1110 for (i = 0; i < length; i+= cols) { 1111 if (hdr != NULL) 1112 printf("%s", hdr); 1113 1114 if ((flags & HD_OMIT_COUNT) == 0) 1115 printf("%04x ", i); 1116 1117 if ((flags & HD_OMIT_HEX) == 0) { 1118 for (j = 0; j < cols; j++) { 1119 k = i + j; 1120 if (k < length) 1121 printf("%c%02x", delim, cp[k]); 1122 else 1123 printf(" "); 1124 } 1125 } 1126 1127 if ((flags & HD_OMIT_CHARS) == 0) { 1128 printf(" |"); 1129 for (j = 0; j < cols; j++) { 1130 k = i + j; 1131 if (k >= length) 1132 printf(" "); 1133 else if (cp[k] >= ' ' && cp[k] <= '~') 1134 printf("%c", cp[k]); 1135 else 1136 printf("."); 1137 } 1138 printf("|"); 1139 } 1140 printf("\n"); 1141 } 1142} 1143#endif /* _KERNEL */ 1144 1145void 1146sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr, 1147 int flags) 1148{ 1149 int i, j, k; 1150 int cols; 1151 const unsigned char *cp; 1152 char delim; 1153 1154 if ((flags & HD_DELIM_MASK) != 0) 1155 delim = (flags & HD_DELIM_MASK) >> 8; 1156 else 1157 delim = ' '; 1158 1159 if ((flags & HD_COLUMN_MASK) != 0) 1160 cols = flags & HD_COLUMN_MASK; 1161 else 1162 cols = 16; 1163 1164 cp = ptr; 1165 for (i = 0; i < length; i+= cols) { 1166 if (hdr != NULL) 1167 sbuf_printf(sb, "%s", hdr); 1168 1169 if ((flags & HD_OMIT_COUNT) == 0) 1170 sbuf_printf(sb, "%04x ", i); 1171 1172 if ((flags & HD_OMIT_HEX) == 0) { 1173 for (j = 0; j < cols; j++) { 1174 k = i + j; 1175 if (k < length) 1176 sbuf_printf(sb, "%c%02x", delim, cp[k]); 1177 else 1178 sbuf_printf(sb, " "); 1179 } 1180 } 1181 1182 if ((flags & HD_OMIT_CHARS) == 0) { 1183 sbuf_printf(sb, " |"); 1184 for (j = 0; j < cols; j++) { 1185 k = i + j; 1186 if (k >= length) 1187 sbuf_printf(sb, " "); 1188 else if (cp[k] >= ' ' && cp[k] <= '~') 1189 sbuf_printf(sb, "%c", cp[k]); 1190 else 1191 sbuf_printf(sb, "."); 1192 } 1193 sbuf_printf(sb, "|"); 1194 } 1195 sbuf_printf(sb, "\n"); 1196 } 1197} 1198
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