subr_prf.c revision 1.22
1 /* $NetBSD: subr_prf.c,v 1.22 1996/03/14 19:01:11 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1986, 1988, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/reboot.h> 48 #include <sys/msgbuf.h> 49 #include <sys/proc.h> 50 #include <sys/ioctl.h> 51 #include <sys/vnode.h> 52 #include <sys/file.h> 53 #include <sys/tty.h> 54 #include <sys/tprintf.h> 55 #include <sys/syslog.h> 56 #include <sys/malloc.h> 57 58 #include <dev/cons.h> 59 60 /* 61 * Note that stdarg.h and the ANSI style va_start macro is used for both 62 * ANSI and traditional C compilers. 63 */ 64 #include <machine/stdarg.h> 65 66 #ifdef KADB 67 #include <machine/kdbparam.h> 68 #endif 69 #ifdef KGDB 70 #include <machine/cpu.h> 71 #endif 72 73 #define TOCONS 0x01 74 #define TOTTY 0x02 75 #define TOLOG 0x04 76 77 struct tty *constty; /* pointer to console "window" tty */ 78 79 void (*v_putc) __P((int)) = cnputc; /* routine to putc on virtual console */ 80 81 static void putchar __P((int, int, struct tty *)); 82 static char *ksprintn __P((u_long, int, int *)); 83 void kprintf __P((const char *, int, struct tty *, va_list)); 84 85 int consintr = 1; /* Ok to handle console interrupts? */ 86 87 /* 88 * Variable panicstr contains argument to first call to panic; used as flag 89 * to indicate that the kernel has already called panic. 90 */ 91 const char *panicstr; 92 93 /* 94 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 95 * and then reboots. If we are called twice, then we avoid trying to sync 96 * the disks as this often leads to recursive panics. 97 */ 98 #ifdef __GNUC__ 99 volatile void boot(int flags); /* boot() does not return */ 100 volatile /* panic() does not return */ 101 #endif 102 void 103 #ifdef __STDC__ 104 panic(const char *fmt, ...) 105 #else 106 panic(fmt, va_alist) 107 char *fmt; 108 va_dcl 109 #endif 110 { 111 int bootopt; 112 va_list ap; 113 static const char fm[] = "panic: %r\n"; 114 115 bootopt = RB_AUTOBOOT | RB_DUMP; 116 if (panicstr) 117 bootopt |= RB_NOSYNC; 118 else 119 panicstr = fmt; 120 121 va_start(ap, fmt); 122 printf(fm, fmt, ap); 123 va_end(ap); 124 125 #ifdef KGDB 126 kgdb_panic(); 127 #endif 128 #ifdef KADB 129 if (boothowto & RB_KDB) 130 kdbpanic(); 131 #endif 132 #ifdef DDB 133 Debugger(); 134 #endif 135 boot(bootopt); 136 } 137 138 /* 139 * Warn that a system table is full. 140 */ 141 void 142 tablefull(tab) 143 const char *tab; 144 { 145 146 log(LOG_ERR, "%s: table is full\n", tab); 147 } 148 149 /* 150 * Uprintf prints to the controlling terminal for the current process. 151 * It may block if the tty queue is overfull. No message is printed if 152 * the queue does not clear in a reasonable time. 153 */ 154 void 155 #ifdef __STDC__ 156 uprintf(const char *fmt, ...) 157 #else 158 uprintf(fmt, va_alist) 159 char *fmt; 160 va_dcl 161 #endif 162 { 163 register struct proc *p = curproc; 164 va_list ap; 165 166 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 167 va_start(ap, fmt); 168 kprintf(fmt, TOTTY, p->p_session->s_ttyp, ap); 169 va_end(ap); 170 } 171 } 172 173 tpr_t 174 tprintf_open(p) 175 register struct proc *p; 176 { 177 178 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 179 SESSHOLD(p->p_session); 180 return ((tpr_t) p->p_session); 181 } 182 return ((tpr_t) NULL); 183 } 184 185 void 186 tprintf_close(sess) 187 tpr_t sess; 188 { 189 190 if (sess) 191 SESSRELE((struct session *) sess); 192 } 193 194 /* 195 * tprintf prints on the controlling terminal associated 196 * with the given session. 197 */ 198 void 199 #ifdef __STDC__ 200 tprintf(tpr_t tpr, const char *fmt, ...) 201 #else 202 tprintf(tpr, fmt, va_alist) 203 tpr_t tpr; 204 char *fmt; 205 va_dcl 206 #endif 207 { 208 register struct session *sess = (struct session *)tpr; 209 struct tty *tp = NULL; 210 int flags = TOLOG; 211 va_list ap; 212 213 logpri(LOG_INFO); 214 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 215 flags |= TOTTY; 216 tp = sess->s_ttyp; 217 } 218 va_start(ap, fmt); 219 kprintf(fmt, flags, tp, ap); 220 va_end(ap); 221 logwakeup(); 222 } 223 224 /* 225 * Ttyprintf displays a message on a tty; it should be used only by 226 * the tty driver, or anything that knows the underlying tty will not 227 * be revoke(2)'d away. Other callers should use tprintf. 228 */ 229 void 230 #ifdef __STDC__ 231 ttyprintf(struct tty *tp, const char *fmt, ...) 232 #else 233 ttyprintf(tp, fmt, va_alist) 234 struct tty *tp; 235 char *fmt; 236 va_dcl 237 #endif 238 { 239 va_list ap; 240 241 va_start(ap, fmt); 242 kprintf(fmt, TOTTY, tp, ap); 243 va_end(ap); 244 } 245 246 extern int log_open; 247 248 /* 249 * Log writes to the log buffer, and guarantees not to sleep (so can be 250 * called by interrupt routines). If there is no process reading the 251 * log yet, it writes to the console also. 252 */ 253 void 254 #ifdef __STDC__ 255 log(int level, const char *fmt, ...) 256 #else 257 log(level, fmt, va_alist) 258 int level; 259 char *fmt; 260 va_dcl 261 #endif 262 { 263 register int s; 264 va_list ap; 265 266 s = splhigh(); 267 logpri(level); 268 va_start(ap, fmt); 269 kprintf(fmt, TOLOG, NULL, ap); 270 splx(s); 271 va_end(ap); 272 if (!log_open) { 273 va_start(ap, fmt); 274 kprintf(fmt, TOCONS, NULL, ap); 275 va_end(ap); 276 } 277 logwakeup(); 278 } 279 280 void 281 logpri(level) 282 int level; 283 { 284 register int ch; 285 register char *p; 286 287 putchar('<', TOLOG, NULL); 288 for (p = ksprintn((u_long)level, 10, NULL); (ch = *p--) != 0;) 289 putchar(ch, TOLOG, NULL); 290 putchar('>', TOLOG, NULL); 291 } 292 293 void 294 #ifdef __STDC__ 295 addlog(const char *fmt, ...) 296 #else 297 addlog(fmt, va_alist) 298 char *fmt; 299 va_dcl 300 #endif 301 { 302 register int s; 303 va_list ap; 304 305 s = splhigh(); 306 va_start(ap, fmt); 307 kprintf(fmt, TOLOG, NULL, ap); 308 splx(s); 309 va_end(ap); 310 if (!log_open) { 311 va_start(ap, fmt); 312 kprintf(fmt, TOCONS, NULL, ap); 313 va_end(ap); 314 } 315 logwakeup(); 316 } 317 318 void 319 #ifdef __STDC__ 320 printf(const char *fmt, ...) 321 #else 322 printf(fmt, va_alist) 323 char *fmt; 324 va_dcl 325 #endif 326 { 327 va_list ap; 328 register int savintr; 329 330 savintr = consintr; /* disable interrupts */ 331 consintr = 0; 332 va_start(ap, fmt); 333 kprintf(fmt, TOCONS | TOLOG, NULL, ap); 334 va_end(ap); 335 if (!panicstr) 336 logwakeup(); 337 consintr = savintr; /* reenable interrupts */ 338 } 339 340 /* 341 * Scaled down version of printf(3). 342 * 343 * Two additional formats: 344 * 345 * The format %b is supported to decode error registers. 346 * Its usage is: 347 * 348 * printf("reg=%b\n", regval, "<base><arg>*"); 349 * 350 * where <base> is the output base expressed as a control character, e.g. 351 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 352 * the first of which gives the bit number to be inspected (origin 1), and 353 * the next characters (up to a control character, i.e. a character <= 32), 354 * give the name of the register. Thus: 355 * 356 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 357 * 358 * would produce output: 359 * 360 * reg=3<BITTWO,BITONE> 361 * 362 * The format %r passes an additional format string and argument list 363 * recursively. Its usage is: 364 * 365 * fn(char *fmt, ...) 366 * { 367 * va_list ap; 368 * va_start(ap, fmt); 369 * printf("prefix: %r: suffix\n", fmt, ap); 370 * va_end(ap); 371 * } 372 * 373 * Space or zero padding and a field width are supported for the numeric 374 * formats only. 375 */ 376 void 377 kprintf(fmt, flags, tp, ap) 378 register const char *fmt; 379 int flags; 380 struct tty *tp; 381 va_list ap; 382 { 383 register char *p, *q; 384 register int ch, n; 385 u_long ul; 386 int base, lflag, tmp, width; 387 char padc; 388 389 for (;;) { 390 padc = ' '; 391 width = 0; 392 while ((ch = *(u_char *)fmt++) != '%') { 393 if (ch == '\0') 394 return; 395 putchar(ch, flags, tp); 396 } 397 lflag = 0; 398 reswitch: switch (ch = *(u_char *)fmt++) { 399 case '0': 400 padc = '0'; 401 goto reswitch; 402 case '1': case '2': case '3': case '4': 403 case '5': case '6': case '7': case '8': case '9': 404 for (width = 0;; ++fmt) { 405 width = width * 10 + ch - '0'; 406 ch = *fmt; 407 if (ch < '0' || ch > '9') 408 break; 409 } 410 goto reswitch; 411 case 'l': 412 lflag = 1; 413 goto reswitch; 414 case 'b': 415 ul = va_arg(ap, int); 416 p = va_arg(ap, char *); 417 for (q = ksprintn(ul, *p++, NULL); (ch = *q--) != 0;) 418 putchar(ch, flags, tp); 419 420 if (!ul) 421 break; 422 423 for (tmp = 0; (n = *p++) != 0;) { 424 if (ul & (1 << (n - 1))) { 425 putchar(tmp ? ',' : '<', flags, tp); 426 for (; (n = *p) > ' '; ++p) 427 putchar(n, flags, tp); 428 tmp = 1; 429 } else 430 for (; *p > ' '; ++p) 431 continue; 432 } 433 if (tmp) 434 putchar('>', flags, tp); 435 break; 436 case 'c': 437 putchar(va_arg(ap, int), flags, tp); 438 break; 439 case 'r': 440 p = va_arg(ap, char *); 441 kprintf(p, flags, tp, va_arg(ap, va_list)); 442 break; 443 case 's': 444 if ((p = va_arg(ap, char *)) == NULL) 445 p = "(null)"; 446 while ((ch = *p++) != 0) 447 putchar(ch, flags, tp); 448 break; 449 case 'd': 450 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 451 if ((long)ul < 0) { 452 putchar('-', flags, tp); 453 ul = -(long)ul; 454 } 455 base = 10; 456 goto number; 457 case 'o': 458 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 459 base = 8; 460 goto number; 461 case 'u': 462 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 463 base = 10; 464 goto number; 465 case 'p': 466 putchar('0', flags, tp); 467 putchar('x', flags, tp); 468 ul = (u_long)va_arg(ap, void *); 469 base = 16; 470 goto number; 471 case 'x': 472 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 473 base = 16; 474 number: p = ksprintn(ul, base, &tmp); 475 if (width && (width -= tmp) > 0) 476 while (width--) 477 putchar(padc, flags, tp); 478 while ((ch = *p--) != 0) 479 putchar(ch, flags, tp); 480 break; 481 default: 482 putchar('%', flags, tp); 483 if (lflag) 484 putchar('l', flags, tp); 485 /* FALLTHROUGH */ 486 case '%': 487 putchar(ch, flags, tp); 488 } 489 } 490 } 491 492 /* 493 * Print a character on console or users terminal. If destination is 494 * the console then the last MSGBUFS characters are saved in msgbuf for 495 * inspection later. 496 */ 497 static void 498 putchar(c, flags, tp) 499 register int c; 500 int flags; 501 struct tty *tp; 502 { 503 extern int msgbufmapped; 504 register struct msgbuf *mbp; 505 506 if (panicstr) 507 constty = NULL; 508 if ((flags & TOCONS) && tp == NULL && constty) { 509 tp = constty; 510 flags |= TOTTY; 511 } 512 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 513 (flags & TOCONS) && tp == constty) 514 constty = NULL; 515 if ((flags & TOLOG) && 516 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 517 mbp = msgbufp; 518 if (mbp->msg_magic != MSG_MAGIC) { 519 bzero((caddr_t)mbp, sizeof(*mbp)); 520 mbp->msg_magic = MSG_MAGIC; 521 } 522 mbp->msg_bufc[mbp->msg_bufx++] = c; 523 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE) 524 mbp->msg_bufx = 0; 525 } 526 if ((flags & TOCONS) && constty == NULL && c != '\0') 527 (*v_putc)(c); 528 } 529 530 /* 531 * Scaled down version of sprintf(3). 532 */ 533 int 534 #ifdef __STDC__ 535 sprintf(char *buf, const char *cfmt, ...) 536 #else 537 sprintf(buf, cfmt, va_alist) 538 char *buf, *cfmt; 539 va_dcl 540 #endif 541 { 542 register const char *fmt = cfmt; 543 register char *p, *bp; 544 register int ch, base; 545 u_long ul; 546 int lflag, tmp, width; 547 va_list ap; 548 char padc; 549 550 va_start(ap, cfmt); 551 for (bp = buf; ; ) { 552 padc = ' '; 553 width = 0; 554 while ((ch = *(u_char *)fmt++) != '%') 555 if ((*bp++ = ch) == '\0') 556 return ((bp - buf) - 1); 557 558 lflag = 0; 559 reswitch: switch (ch = *(u_char *)fmt++) { 560 case '0': 561 padc = '0'; 562 goto reswitch; 563 case '1': case '2': case '3': case '4': 564 case '5': case '6': case '7': case '8': case '9': 565 for (width = 0;; ++fmt) { 566 width = width * 10 + ch - '0'; 567 ch = *fmt; 568 if (ch < '0' || ch > '9') 569 break; 570 } 571 goto reswitch; 572 case 'l': 573 lflag = 1; 574 goto reswitch; 575 /* case 'b': ... break; XXX */ 576 case 'c': 577 *bp++ = va_arg(ap, int); 578 break; 579 /* case 'r': ... break; XXX */ 580 case 's': 581 p = va_arg(ap, char *); 582 while ((*bp++ = *p++) != 0) 583 continue; 584 --bp; 585 break; 586 case 'd': 587 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 588 if ((long)ul < 0) { 589 *bp++ = '-'; 590 ul = -(long)ul; 591 } 592 base = 10; 593 goto number; 594 break; 595 case 'o': 596 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 597 base = 8; 598 goto number; 599 break; 600 case 'u': 601 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 602 base = 10; 603 goto number; 604 break; 605 case 'p': 606 *bp++ = '0'; 607 *bp++ = 'x'; 608 ul = (u_long)va_arg(ap, void *); 609 base = 16; 610 goto number; 611 case 'x': 612 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 613 base = 16; 614 number: p = ksprintn(ul, base, &tmp); 615 if (width && (width -= tmp) > 0) 616 while (width--) 617 *bp++ = padc; 618 while ((ch = *p--) != 0) 619 *bp++ = ch; 620 break; 621 default: 622 *bp++ = '%'; 623 if (lflag) 624 *bp++ = 'l'; 625 /* FALLTHROUGH */ 626 case '%': 627 *bp++ = ch; 628 } 629 } 630 va_end(ap); 631 } 632 633 /* 634 * Put a number (base <= 16) in a buffer in reverse order; return an 635 * optional length and a pointer to the NULL terminated (preceded?) 636 * buffer. 637 */ 638 static char * 639 ksprintn(ul, base, lenp) 640 register u_long ul; 641 register int base, *lenp; 642 { /* A long in base 8, plus NULL. */ 643 static char buf[sizeof(long) * NBBY / 3 + 2]; 644 register char *p; 645 646 p = buf; 647 do { 648 *++p = "0123456789abcdef"[ul % base]; 649 } while (ul /= base); 650 if (lenp) 651 *lenp = p - buf; 652 return (p); 653 } 654
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