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