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