Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c
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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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 39 * $FreeBSD: src/sys/kern/subr_prf.c,v 1.39.2.2 1999/09/05 08:15:13 peter Exp $ 40 */ 41 42 #include "opt_ddb.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/msgbuf.h> 48 #include <sys/proc.h> 49 #include <sys/tty.h> 50 #include <sys/tprintf.h> 51 #include <sys/syslog.h> 52 #include <sys/malloc.h> 53 #include <machine/cons.h> 54 55 /* 56 * Note that stdarg.h and the ANSI style va_start macro is used for both 57 * ANSI and traditional C compilers. 58 */ 59 #include <machine/stdarg.h> 60 61 #define TOCONS 0x01 62 #define TOTTY 0x02 63 #define TOLOG 0x04 64 65 struct tty *constty; /* pointer to console "window" tty */ 66 67 static void (*v_putc)(int) = cnputc; /* routine to putc on virtual console */ 68 static void logpri __P((int level)); 69 static void msglogchar(int c, void *dummyarg); 70 struct putchar_arg {int flags; struct tty *tty; }; 71 static void putchar __P((int ch, void *arg)); 72 static char *ksprintn __P((u_long num, int base, int *len)); 73 74 static int consintr = 1; /* Ok to handle console interrupts? */ 75 static int msgbufmapped; /* Set when safe to use msgbuf */ 76 77 /* 78 * Warn that a system table is full. 79 */ 80 void 81 tablefull(tab) 82 const char *tab; 83 { 84 85 log(LOG_ERR, "%s: table is full\n", tab); 86 } 87 88 /* 89 * Uprintf prints to the controlling terminal for the current process. 90 * It may block if the tty queue is overfull. No message is printed if 91 * the queue does not clear in a reasonable time. 92 */ 93 void 94 uprintf(const char *fmt, ...) 95 { 96 struct proc *p = curproc; 97 va_list ap; 98 struct putchar_arg pca; 99 100 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 101 va_start(ap, fmt); 102 pca.tty = p->p_session->s_ttyp; 103 pca.flags = TOTTY; 104 kvprintf(fmt, putchar, &pca, 10, ap); 105 va_end(ap); 106 } 107 } 108 109 tpr_t 110 tprintf_open(p) 111 register struct proc *p; 112 { 113 114 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 115 SESSHOLD(p->p_session); 116 return ((tpr_t) p->p_session); 117 } 118 return ((tpr_t) NULL); 119 } 120 121 void 122 tprintf_close(sess) 123 tpr_t sess; 124 { 125 126 if (sess) 127 SESSRELE((struct session *) sess); 128 } 129 130 /* 131 * tprintf prints on the controlling terminal associated 132 * with the given session. 133 */ 134 void 135 tprintf(tpr_t tpr, const char *fmt, ...) 136 { 137 register struct session *sess = (struct session *)tpr; 138 struct tty *tp = NULL; 139 int flags = TOLOG; 140 va_list ap; 141 struct putchar_arg pca; 142 143 logpri(LOG_INFO); 144 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 145 flags |= TOTTY; 146 tp = sess->s_ttyp; 147 } 148 va_start(ap, fmt); 149 pca.tty = tp; 150 pca.flags = flags; 151 kvprintf(fmt, putchar, &pca, 10, ap); 152 va_end(ap); 153 logwakeup(); 154 } 155 156 /* 157 * Ttyprintf displays a message on a tty; it should be used only by 158 * the tty driver, or anything that knows the underlying tty will not 159 * be revoke(2)'d away. Other callers should use tprintf. 160 */ 161 void 162 ttyprintf(struct tty *tp, const char *fmt, ...) 163 { 164 va_list ap; 165 struct putchar_arg pca; 166 va_start(ap, fmt); 167 pca.tty = tp; 168 pca.flags = TOTTY; 169 kvprintf(fmt, putchar, &pca, 10, ap); 170 va_end(ap); 171 } 172 173 extern int log_open; 174 175 /* 176 * Log writes to the log buffer, and guarantees not to sleep (so can be 177 * called by interrupt routines). If there is no process reading the 178 * log yet, it writes to the console also. 179 */ 180 void 181 log(int level, const char *fmt, ...) 182 { 183 register int s; 184 va_list ap; 185 186 s = splhigh(); 187 logpri(level); 188 va_start(ap, fmt); 189 190 kvprintf(fmt, msglogchar, NULL, 10, ap); 191 va_end(ap); 192 193 splx(s); 194 if (!log_open) { 195 struct putchar_arg pca; 196 va_start(ap, fmt); 197 pca.tty = NULL; 198 pca.flags = TOCONS; 199 kvprintf(fmt, putchar, &pca, 10, ap); 200 va_end(ap); 201 } 202 logwakeup(); 203 } 204 205 static void 206 logpri(level) 207 int level; 208 { 209 register char *p; 210 211 msglogchar('<', NULL); 212 for (p = ksprintn((u_long)level, 10, NULL); *p;) 213 msglogchar(*p--, NULL); 214 msglogchar('>', NULL); 215 } 216 217 int 218 addlog(const char *fmt, ...) 219 { 220 register int s; 221 va_list ap; 222 int retval; 223 224 s = splhigh(); 225 va_start(ap, fmt); 226 retval = kvprintf(fmt, msglogchar, NULL, 10, ap); 227 splx(s); 228 va_end(ap); 229 if (!log_open) { 230 struct putchar_arg pca; 231 va_start(ap, fmt); 232 pca.tty = NULL; 233 pca.flags = TOCONS; 234 kvprintf(fmt, putchar, &pca, 10, ap); 235 va_end(ap); 236 } 237 logwakeup(); 238 return (retval); 239 } 240 241 int 242 printf(const char *fmt, ...) 243 { 244 va_list ap; 245 register int savintr; 246 struct putchar_arg pca; 247 int retval; 248 249 savintr = consintr; /* disable interrupts */ 250 consintr = 0; 251 va_start(ap, fmt); 252 pca.tty = NULL; 253 pca.flags = TOCONS | TOLOG; 254 retval = kvprintf(fmt, putchar, &pca, 10, ap); 255 va_end(ap); 256 if (!panicstr) 257 logwakeup(); 258 consintr = savintr; /* reenable interrupts */ 259 return retval; 260 } 261 262 void 263 vprintf(const char *fmt, va_list ap) 264 { 265 register int savintr; 266 struct putchar_arg pca; 267 268 savintr = consintr; /* disable interrupts */ 269 consintr = 0; 270 pca.tty = NULL; 271 pca.flags = TOCONS | TOLOG; 272 kvprintf(fmt, putchar, &pca, 10, ap); 273 if (!panicstr) 274 logwakeup(); 275 consintr = savintr; /* reenable interrupts */ 276 } 277 278 /* 279 * Print a character on console or users terminal. If destination is 280 * the console then the last bunch of characters are saved in msgbuf for 281 * inspection later. 282 */ 283 static void 284 putchar(int c, void *arg) 285 { 286 struct putchar_arg *ap = (struct putchar_arg*) arg; 287 int flags = ap->flags; 288 struct tty *tp = ap->tty; 289 if (panicstr) 290 constty = NULL; 291 if ((flags & TOCONS) && tp == NULL && constty) { 292 tp = constty; 293 flags |= TOTTY; 294 } 295 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 296 (flags & TOCONS) && tp == constty) 297 constty = NULL; 298 if ((flags & TOLOG)) 299 msglogchar(c, NULL); 300 if ((flags & TOCONS) && constty == NULL && c != '\0') 301 (*v_putc)(c); 302 } 303 304 /* 305 * Scaled down version of sprintf(3). 306 */ 307 int 308 sprintf(char *buf, const char *cfmt, ...) 309 { 310 int retval; 311 va_list ap; 312 313 va_start(ap, cfmt); 314 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 315 buf[retval] = '\0'; 316 va_end(ap); 317 return retval; 318 } 319 320 /* 321 * Put a number (base <= 16) in a buffer in reverse order; return an 322 * optional length and a pointer to the NULL terminated (preceded?) 323 * buffer. 324 */ 325 static char * 326 ksprintn(ul, base, lenp) 327 register u_long ul; 328 register int base, *lenp; 329 { /* A long in base 8, plus NULL. */ 330 static char buf[sizeof(long) * NBBY / 3 + 2]; 331 register char *p; 332 333 p = buf; 334 do { 335 *++p = hex2ascii(ul % base); 336 } while (ul /= base); 337 if (lenp) 338 *lenp = p - buf; 339 return (p); 340 } 341 342 /* 343 * Scaled down version of printf(3). 344 * 345 * Two additional formats: 346 * 347 * The format %b is supported to decode error registers. 348 * Its usage is: 349 * 350 * printf("reg=%b\n", regval, "<base><arg>*"); 351 * 352 * where <base> is the output base expressed as a control character, e.g. 353 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 354 * the first of which gives the bit number to be inspected (origin 1), and 355 * the next characters (up to a control character, i.e. a character <= 32), 356 * give the name of the register. Thus: 357 * 358 * kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n"); 359 * 360 * would produce output: 361 * 362 * reg=3<BITTWO,BITONE> 363 * 364 * XXX: %D -- Hexdump, takes pointer and separator string: 365 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 366 * ("%*D", len, ptr, " " -> XX XX XX XX ... 367 */ 368 int 369 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 370 { 371 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 372 char *p, *q, *d; 373 u_char *up; 374 int ch, n; 375 u_long ul; 376 int base, lflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 377 int dwidth; 378 char padc; 379 int retval = 0; 380 381 if (!func) 382 d = (char *) arg; 383 else 384 d = NULL; 385 386 if (fmt == NULL) 387 fmt = "(fmt null)\n"; 388 389 if (radix < 2 || radix > 36) 390 radix = 10; 391 392 for (;;) { 393 padc = ' '; 394 width = 0; 395 while ((ch = (u_char)*fmt++) != '%') { 396 if (ch == '\0') 397 return retval; 398 PCHAR(ch); 399 } 400 lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 401 sign = 0; dot = 0; dwidth = 0; 402 reswitch: switch (ch = (u_char)*fmt++) { 403 case '.': 404 dot = 1; 405 goto reswitch; 406 case '#': 407 sharpflag = 1; 408 goto reswitch; 409 case '+': 410 sign = 1; 411 goto reswitch; 412 case '-': 413 ladjust = 1; 414 goto reswitch; 415 case '%': 416 PCHAR(ch); 417 break; 418 case '*': 419 if (!dot) { 420 width = va_arg(ap, int); 421 if (width < 0) { 422 ladjust = !ladjust; 423 width = -width; 424 } 425 } else { 426 dwidth = va_arg(ap, int); 427 } 428 goto reswitch; 429 case '': 430 if (!dot) { 431 padc = ''; 432 goto reswitch; 433 } 434 case '1': case '2': case '3': case '4': 435 case '5': case '6': case '7': case '8': case '9': 436 for (n = 0;; ++fmt) { 437 n = n * 10 + ch - ''; 438 ch = *fmt; 439 if (ch < '' || ch > '9') 440 break; 441 } 442 if (dot) 443 dwidth = n; 444 else 445 width = n; 446 goto reswitch; 447 case 'b': 448 ul = va_arg(ap, int); 449 p = va_arg(ap, char *); 450 for (q = ksprintn(ul, *p++, NULL); *q;) 451 PCHAR(*q--); 452 453 if (!ul) 454 break; 455 456 for (tmp = 0; *p;) { 457 n = *p++; 458 if (ul & (1 << (n - 1))) { 459 PCHAR(tmp ? ',' : '<'); 460 for (; (n = *p) > ' '; ++p) 461 PCHAR(n); 462 tmp = 1; 463 } else 464 for (; *p > ' '; ++p) 465 continue; 466 } 467 if (tmp) 468 PCHAR('>'); 469 break; 470 case 'c': 471 PCHAR(va_arg(ap, int)); 472 break; 473 case 'D': 474 up = va_arg(ap, u_char *); 475 p = va_arg(ap, char *); 476 if (!width) 477 width = 16; 478 while(width--) { 479 PCHAR(hex2ascii(*up >> 4)); 480 PCHAR(hex2ascii(*up & 0x0f)); 481 up++; 482 if (width) 483 for (q=p;*q;q++) 484 PCHAR(*q); 485 } 486 break; 487 case 'd': 488 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 489 sign = 1; 490 base = 10; 491 goto number; 492 case 'l': 493 lflag = 1; 494 goto reswitch; 495 case 'n': 496 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 497 base = radix; 498 goto number; 499 case 'o': 500 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 501 base = 8; 502 goto number; 503 case 'p': 504 ul = (u_long)va_arg(ap, void *); 505 base = 16; 506 PCHAR(''); 507 PCHAR('x'); 508 goto number; 509 case 's': 510 p = va_arg(ap, char *); 511 if (p == NULL) 512 p = "(null)"; 513 if (!dot) 514 n = strlen (p); 515 else 516 for (n = 0; n < dwidth && p[n]; n++) 517 continue; 518 519 width -= n; 520 521 if (!ladjust && width > 0) 522 while (width--) 523 PCHAR(padc); 524 while (n--) 525 PCHAR(*p++); 526 if (ladjust && width > 0) 527 while (width--) 528 PCHAR(padc); 529 break; 530 case 'u': 531 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 532 base = 10; 533 goto number; 534 case 'x': 535 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 536 base = 16; 537 number: if (sign && (long)ul < 0L) { 538 neg = 1; 539 ul = -(long)ul; 540 } 541 p = ksprintn(ul, base, &tmp); 542 if (sharpflag && ul != 0) { 543 if (base == 8) 544 tmp++; 545 else if (base == 16) 546 tmp += 2; 547 } 548 if (neg) 549 tmp++; 550 551 if (!ladjust && width && (width -= tmp) > 0) 552 while (width--) 553 PCHAR(padc); 554 if (neg) 555 PCHAR('-'); 556 if (sharpflag && ul != 0) { 557 if (base == 8) { 558 PCHAR(''); 559 } else if (base == 16) { 560 PCHAR(''); 561 PCHAR('x'); 562 } 563 } 564 565 while (*p) 566 PCHAR(*p--); 567 568 if (ladjust && width && (width -= tmp) > 0) 569 while (width--) 570 PCHAR(padc); 571 572 break; 573 default: 574 PCHAR('%'); 575 if (lflag) 576 PCHAR('l'); 577 PCHAR(ch); 578 break; 579 } 580 } 581 #undef PCHAR 582 } 583 584 /* 585 * Put character in log buffer. 586 */ 587 static void 588 msglogchar(int c, void *dummyarg) 589 { 590 struct msgbuf *mbp; 591 592 if (c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 593 mbp = msgbufp; 594 mbp->msg_ptr[mbp->msg_bufx++] = c; 595 if (mbp->msg_bufx >= mbp->msg_size) 596 mbp->msg_bufx = 0; 597 /* If the buffer is full, keep the most recent data. */ 598 if (mbp->msg_bufr == mbp->msg_bufx) { 599 if (++mbp->msg_bufr >= mbp->msg_size) 600 mbp->msg_bufr = 0; 601 } 602 } 603 } 604 605 void 606 msgbufinit(void *ptr, size_t size) 607 { 608 char *cp; 609 610 cp = (char *)ptr; 611 msgbufp = (struct msgbuf *) (cp + size - sizeof(*msgbufp)); 612 if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_ptr != cp) { 613 bzero(cp, size); 614 msgbufp->msg_magic = MSG_MAGIC; 615 msgbufp->msg_size = (char *)msgbufp - cp; 616 msgbufp->msg_ptr = cp; 617 } 618 msgbufmapped = 1; 619 } 620 621 #include "opt_ddb.h" 622 #ifdef DDB 623 #include <ddb/ddb.h> 624 625 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 626 { 627 int i, j; 628 629 if (!msgbufmapped) { 630 db_printf("msgbuf not mapped yet\n"); 631 return; 632 } 633 db_printf("msgbufp = %p\n", msgbufp); 634 db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n", 635 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr, 636 msgbufp->msg_bufx, msgbufp->msg_ptr); 637 for (i = 0; i < msgbufp->msg_size; i++) { 638 j = (i + msgbufp->msg_bufr) % msgbufp->msg_size; 639 db_printf("%c", msgbufp->msg_ptr[j]); 640 } 641 db_printf("\n"); 642 } 643 644 #endif /* DDB */
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