1 /* $NetBSD: subr_prf.c,v 1.203 2023/08/29 21:23:14 andvar 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)subr_prf.c 8.4 (Berkeley) 5/4/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.203 2023/08/29 21:23:14 andvar Exp $"); 41 42 #ifdef _KERNEL_OPT 43 #include "opt_ddb.h" 44 #include "opt_kgdb.h" 45 #include "opt_dump.h" 46 #include "opt_rnd_printf.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/stdint.h> 51 #include <sys/systm.h> 52 #include <sys/buf.h> 53 #include <sys/device.h> 54 #include <sys/reboot.h> 55 #include <sys/msgbuf.h> 56 #include <sys/proc.h> 57 #include <sys/ioctl.h> 58 #include <sys/vnode.h> 59 #include <sys/file.h> 60 #include <sys/tty.h> 61 #include <sys/tprintf.h> 62 #include <sys/spldebug.h> 63 #include <sys/syslog.h> 64 #include <sys/kprintf.h> 65 #include <sys/atomic.h> 66 #include <sys/kernel.h> 67 #include <sys/cpu.h> 68 #include <sys/rndsource.h> 69 #include <sys/kmem.h> 70 71 #include <dev/cons.h> 72 73 #include <net/if.h> 74 75 static kmutex_t kprintf_mtx; 76 static bool kprintf_inited = false; 77 78 #ifdef KGDB 79 #include <sys/kgdb.h> 80 #endif 81 82 #ifdef DDB 83 #include <ddb/ddbvar.h> /* db_panic */ 84 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 85 #endif 86 87 88 /* 89 * defines 90 */ 91 #define KLOG_PRI 0x80000000 92 93 94 /* 95 * local prototypes 96 */ 97 98 static void putchar(int, int, struct tty *); 99 static void kprintf_internal(const char *, int, void *, char *, ...); 100 101 102 /* 103 * globals 104 */ 105 106 const char *panicstr; /* arg to first call to panic (used as a flag 107 to indicate that panic has already been called). */ 108 struct cpu_info *paniccpu; /* cpu that first panicked */ 109 long panicstart, panicend; /* position in the msgbuf of the start and 110 end of the formatted panicstr. */ 111 int doing_shutdown; /* set to indicate shutdown in progress */ 112 113 #ifdef RND_PRINTF 114 static krndsource_t rnd_printf_source; 115 #endif 116 117 #ifndef DUMP_ON_PANIC 118 #define DUMP_ON_PANIC 1 119 #endif 120 int dumponpanic = DUMP_ON_PANIC; 121 122 /* 123 * v_putc: routine to putc on virtual console 124 * 125 * the v_putc pointer can be used to redirect the console cnputc elsewhere 126 * [e.g. to a "virtual console"]. 127 */ 128 129 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 130 void (*v_flush)(void) = cnflush; /* start with cnflush (normal cons) */ 131 132 const char hexdigits[] = "0123456789abcdef"; 133 const char HEXDIGITS[] = "0123456789ABCDEF"; 134 135 136 /* 137 * functions 138 */ 139 140 /* 141 * Locking is inited fairly early in MI bootstrap. Before that 142 * prints are done unlocked. But that doesn't really matter, 143 * since nothing can preempt us before interrupts are enabled. 144 */ 145 void 146 kprintf_init(void) 147 { 148 149 KASSERT(!kprintf_inited); /* not foolproof, but ... */ 150 KASSERT(cold); 151 mutex_init(&kprintf_mtx, MUTEX_DEFAULT, IPL_HIGH); 152 #ifdef RND_PRINTF 153 rnd_attach_source(&rnd_printf_source, "printf", RND_TYPE_UNKNOWN, 154 RND_FLAG_COLLECT_TIME|RND_FLAG_COLLECT_VALUE); 155 #endif 156 kprintf_inited = true; 157 } 158 159 void 160 kprintf_lock(void) 161 { 162 163 if (__predict_true(kprintf_inited)) 164 mutex_enter(&kprintf_mtx); 165 } 166 167 void 168 kprintf_unlock(void) 169 { 170 171 if (__predict_true(kprintf_inited)) { 172 /* assert kprintf wasn't somehow inited while we were in */ 173 KASSERT(mutex_owned(&kprintf_mtx)); 174 mutex_exit(&kprintf_mtx); 175 } 176 } 177 178 /* 179 * twiddle: spin a little propellor on the console. 180 */ 181 182 void 183 twiddle(void) 184 { 185 static const char twiddle_chars[] = "|/-\\"; 186 static int pos; 187 188 kprintf_lock(); 189 190 putchar(twiddle_chars[pos++ & 3], TOCONS|NOTSTAMP, NULL); 191 putchar('\b', TOCONS|NOTSTAMP, NULL); 192 193 kprintf_unlock(); 194 } 195 196 /* 197 * panic: handle an unresolvable fatal error 198 * 199 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 200 * call) we avoid trying to dump and just reboot (to avoid recursive panics). 201 */ 202 203 void 204 panic(const char *fmt, ...) 205 { 206 va_list ap; 207 208 va_start(ap, fmt); 209 vpanic(fmt, ap); 210 va_end(ap); 211 } 212 213 void 214 vpanic(const char *fmt, va_list ap) 215 { 216 CPU_INFO_ITERATOR cii; 217 struct cpu_info *ci, *oci; 218 int bootopt; 219 static char scratchstr[384]; /* stores panic message */ 220 221 spldebug_stop(); 222 223 if (lwp0.l_cpu && curlwp) { 224 /* 225 * Disable preemption. If already panicking on another CPU, sit 226 * here and spin until the system is rebooted. Allow the CPU that 227 * first panicked to panic again. 228 */ 229 kpreempt_disable(); 230 ci = curcpu(); 231 oci = atomic_cas_ptr((void *)&paniccpu, NULL, ci); 232 if (oci != NULL && oci != ci) { 233 /* Give interrupts a chance to try and prevent deadlock. */ 234 for (;;) { 235 #ifndef _RUMPKERNEL /* XXXpooka: temporary build fix, see kern/40505 */ 236 DELAY(10); 237 #endif /* _RUMPKERNEL */ 238 } 239 } 240 241 /* 242 * Convert the current thread to a bound thread and prevent all 243 * CPUs from scheduling unbound jobs. Do so without taking any 244 * locks. 245 */ 246 curlwp->l_pflag |= LP_BOUND; 247 for (CPU_INFO_FOREACH(cii, ci)) { 248 ci->ci_schedstate.spc_flags |= SPCF_OFFLINE; 249 } 250 } 251 252 bootopt = RB_AUTOBOOT | RB_NOSYNC; 253 if (!doing_shutdown) { 254 if (dumponpanic) 255 bootopt |= RB_DUMP; 256 } else 257 printf("Skipping crash dump on recursive panic\n"); 258 259 doing_shutdown = 1; 260 261 if (logenabled(msgbufp)) 262 panicstart = msgbufp->msg_bufx; 263 264 kprintf_lock(); 265 kprintf_internal("panic: ", TOLOG|TOCONS, NULL, NULL); 266 if (panicstr == NULL) { 267 /* first time in panic - store fmt first for precaution */ 268 panicstr = fmt; 269 270 vsnprintf(scratchstr, sizeof(scratchstr), fmt, ap); 271 kprintf_internal("%s", TOLOG|TOCONS, NULL, NULL, scratchstr); 272 panicstr = scratchstr; 273 } else { 274 kprintf(fmt, TOLOG|TOCONS, NULL, NULL, ap); 275 } 276 kprintf_internal("\n", TOLOG|TOCONS, NULL, NULL); 277 kprintf_unlock(); 278 279 if (logenabled(msgbufp)) 280 panicend = msgbufp->msg_bufx; 281 282 #ifdef KGDB 283 kgdb_panic(); 284 #endif 285 #ifdef DDB 286 db_panic(); 287 #endif 288 kern_reboot(bootopt, NULL); 289 } 290 291 /* 292 * kernel logging functions: log, logpri, addlog 293 */ 294 295 /* 296 * log: write to the log buffer 297 * 298 * => will not sleep [so safe to call from interrupt] 299 * => will log to console if /dev/klog isn't open 300 */ 301 302 void 303 log(int level, const char *fmt, ...) 304 { 305 va_list ap; 306 307 kprintf_lock(); 308 309 klogpri(level); /* log the level first */ 310 va_start(ap, fmt); 311 kprintf(fmt, TOLOG, NULL, NULL, ap); 312 va_end(ap); 313 if (!log_open) { 314 va_start(ap, fmt); 315 kprintf(fmt, TOCONS, NULL, NULL, ap); 316 va_end(ap); 317 } 318 319 kprintf_unlock(); 320 321 logwakeup(); /* wake up anyone waiting for log msgs */ 322 } 323 324 /* 325 * vlog: write to the log buffer [already have va_list] 326 */ 327 328 void 329 vlog(int level, const char *fmt, va_list ap) 330 { 331 va_list cap; 332 333 va_copy(cap, ap); 334 kprintf_lock(); 335 336 klogpri(level); /* log the level first */ 337 kprintf(fmt, TOLOG, NULL, NULL, ap); 338 if (!log_open) 339 kprintf(fmt, TOCONS, NULL, NULL, cap); 340 341 kprintf_unlock(); 342 va_end(cap); 343 344 logwakeup(); /* wake up anyone waiting for log msgs */ 345 } 346 347 /* 348 * logpri: log the priority level to the klog 349 */ 350 351 void 352 logpri(int level) 353 { 354 355 kprintf_lock(); 356 klogpri(level); 357 kprintf_unlock(); 358 } 359 360 /* 361 * Note: we must be in the mutex here! 362 */ 363 void 364 klogpri(int level) 365 { 366 KASSERT((level & KLOG_PRI) == 0); 367 368 putchar(level | KLOG_PRI, TOLOG, NULL); 369 } 370 371 /* 372 * addlog: add info to previous log message 373 */ 374 375 void 376 addlog(const char *fmt, ...) 377 { 378 va_list ap; 379 380 kprintf_lock(); 381 382 va_start(ap, fmt); 383 kprintf(fmt, TOLOG, NULL, NULL, ap); 384 va_end(ap); 385 if (!log_open) { 386 va_start(ap, fmt); 387 kprintf(fmt, TOCONS, NULL, NULL, ap); 388 va_end(ap); 389 } 390 391 kprintf_unlock(); 392 393 logwakeup(); 394 } 395 396 static void 397 putone(int c, int flags, struct tty *tp) 398 { 399 struct tty *ctp; 400 int s; 401 bool do_ps = !cold; 402 403 ctp = NULL; /* XXX gcc i386 -Os */ 404 405 /* 406 * Ensure whatever constty points to can't go away while we're 407 * trying to use it. 408 */ 409 if (__predict_true(do_ps)) 410 s = pserialize_read_enter(); 411 412 if (panicstr) 413 atomic_store_relaxed(&constty, NULL); 414 415 if ((flags & TOCONS) && 416 (ctp = atomic_load_consume(&constty)) != NULL && 417 tp == NULL) { 418 tp = ctp; 419 flags |= TOTTY; 420 } 421 if ((flags & TOTTY) && tp && 422 tputchar(c, flags, tp) < 0 && 423 (flags & TOCONS)) 424 atomic_cas_ptr(&constty, tp, NULL); 425 if ((flags & TOLOG) && 426 c != '\0' && c != '\r' && c != 0177) 427 logputchar(c); 428 if ((flags & TOCONS) && ctp == NULL && c != '\0') 429 (*v_putc)(c); 430 431 if (__predict_true(do_ps)) 432 pserialize_read_exit(s); 433 } 434 435 static void 436 putlogpri(int level) 437 { 438 char *p; 439 char snbuf[KPRINTF_BUFSIZE]; 440 441 putone('<', TOLOG, NULL); 442 snprintf(snbuf, sizeof(snbuf), "%d", level); 443 for (p = snbuf ; *p ; p++) 444 putone(*p, TOLOG, NULL); 445 putone('>', TOLOG, NULL); 446 } 447 448 #ifndef KLOG_NOTIMESTAMP 449 static int needtstamp = 1; 450 int log_ts_prec = 7; 451 452 static void 453 addtstamp(int flags, struct tty *tp) 454 { 455 char buf[64]; 456 struct timespec ts; 457 int n, prec; 458 long fsec; 459 460 prec = log_ts_prec; 461 if (prec < 0) { 462 prec = 0; 463 log_ts_prec = prec; 464 } else if (prec > 9) { 465 prec = 9; 466 log_ts_prec = prec; 467 } 468 469 getnanouptime(&ts); 470 471 for (n = prec, fsec = ts.tv_nsec; n < 8; n++) 472 fsec /= 10; 473 if (n < 9) 474 fsec = (fsec / 10) + ((fsec % 10) >= 5); 475 476 n = snprintf(buf, sizeof(buf), "[% 4jd.%.*ld] ", 477 (intmax_t)ts.tv_sec, prec, fsec); 478 479 for (int i = 0; i < n; i++) 480 putone(buf[i], flags, tp); 481 } 482 #endif 483 484 /* 485 * putchar: print a single character on console or user terminal. 486 * 487 * => if console, then the last MSGBUFS chars are saved in msgbuf 488 * for inspection later (e.g. dmesg/syslog) 489 * => we must already be in the mutex! 490 */ 491 static void 492 putchar(int c, int flags, struct tty *tp) 493 { 494 if (c & KLOG_PRI) { 495 putlogpri(c & ~KLOG_PRI); 496 return; 497 } 498 499 #ifndef KLOG_NOTIMESTAMP 500 if (c != '\0' && c != '\n' && needtstamp && (flags & NOTSTAMP) == 0) { 501 addtstamp(flags, tp); 502 needtstamp = 0; 503 } 504 505 if (c == '\n') 506 needtstamp = 1; 507 #endif 508 putone(c, flags, tp); 509 510 #ifdef DDB 511 if (flags & TODDB) { 512 db_putchar(c); 513 return; 514 } 515 #endif 516 517 #ifdef RND_PRINTF 518 if (__predict_true(kprintf_inited)) { 519 unsigned char ch = c; 520 rnd_add_data_intr(&rnd_printf_source, &ch, 1, 0); 521 } 522 #endif 523 } 524 525 /* 526 * tablefull: warn that a system table is full 527 */ 528 529 void 530 tablefull(const char *tab, const char *hint) 531 { 532 if (hint) 533 log(LOG_ERR, "%s: table is full - %s\n", tab, hint); 534 else 535 log(LOG_ERR, "%s: table is full\n", tab); 536 } 537 538 539 /* 540 * uprintf: print to the controlling tty of the current process 541 * 542 * => we may block if the tty queue is full 543 * => no message is printed if the queue doesn't clear in a reasonable 544 * time 545 */ 546 547 void 548 uprintf(const char *fmt, ...) 549 { 550 struct proc *p = curproc; 551 va_list ap; 552 553 /* mutex_enter(&proc_lock); XXXSMP */ 554 555 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 556 /* No mutex needed; going to process TTY. */ 557 va_start(ap, fmt); 558 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 559 va_end(ap); 560 } 561 562 /* mutex_exit(&proc_lock); XXXSMP */ 563 } 564 565 void 566 uprintf_locked(const char *fmt, ...) 567 { 568 struct proc *p = curproc; 569 va_list ap; 570 571 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 572 /* No mutex needed; going to process TTY. */ 573 va_start(ap, fmt); 574 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 575 va_end(ap); 576 } 577 } 578 579 /* 580 * tprintf functions: used to send messages to a specific process 581 * 582 * usage: 583 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 584 * use the handle when calling "tprintf" 585 * when done, do a "tprintf_close" to drop the handle 586 */ 587 588 /* 589 * tprintf_open: get a tprintf handle on a process "p" 590 * 591 * => returns NULL if process can't be printed to 592 */ 593 594 tpr_t 595 tprintf_open(struct proc *p) 596 { 597 tpr_t cookie; 598 599 cookie = NULL; 600 601 mutex_enter(&proc_lock); 602 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 603 proc_sesshold(p->p_session); 604 cookie = (tpr_t)p->p_session; 605 } 606 mutex_exit(&proc_lock); 607 608 return cookie; 609 } 610 611 /* 612 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 613 */ 614 615 void 616 tprintf_close(tpr_t sess) 617 { 618 619 if (sess) { 620 mutex_enter(&proc_lock); 621 /* Releases proc_lock. */ 622 proc_sessrele((struct session *)sess); 623 } 624 } 625 626 /* 627 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 628 * send a message to the controlling tty for that process. 629 * 630 * => also sends message to /dev/klog 631 */ 632 void 633 tprintf(tpr_t tpr, const char *fmt, ...) 634 { 635 struct session *sess = (struct session *)tpr; 636 struct tty *tp = NULL; 637 int flags = TOLOG; 638 va_list ap; 639 640 /* mutex_enter(&proc_lock); XXXSMP */ 641 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp)) { 642 flags |= TOTTY; 643 tp = sess->s_ttyp; 644 } 645 646 kprintf_lock(); 647 648 klogpri(LOG_INFO); 649 va_start(ap, fmt); 650 kprintf(fmt, flags, tp, NULL, ap); 651 va_end(ap); 652 653 kprintf_unlock(); 654 /* mutex_exit(&proc_lock); XXXSMP */ 655 656 logwakeup(); 657 } 658 659 660 /* 661 * ttyprintf: send a message to a specific tty 662 * 663 * => should be used only by tty driver or anything that knows the 664 * underlying tty will not be revoked(2)'d away. [otherwise, 665 * use tprintf] 666 */ 667 void 668 ttyprintf(struct tty *tp, const char *fmt, ...) 669 { 670 va_list ap; 671 672 /* No mutex needed; going to process TTY. */ 673 va_start(ap, fmt); 674 kprintf(fmt, TOTTY, tp, NULL, ap); 675 va_end(ap); 676 } 677 678 #ifdef DDB 679 680 /* 681 * db_printf: printf for DDB (via db_putchar) 682 */ 683 684 void 685 db_printf(const char *fmt, ...) 686 { 687 va_list ap; 688 689 /* No mutex needed; DDB pauses all processors. */ 690 va_start(ap, fmt); 691 kprintf(fmt, TODDB, NULL, NULL, ap); 692 va_end(ap); 693 694 if (db_tee_msgbuf) { 695 va_start(ap, fmt); 696 kprintf(fmt, TOLOG, NULL, NULL, ap); 697 va_end(ap); 698 } 699 } 700 701 void 702 db_vprintf(const char *fmt, va_list ap) 703 { 704 va_list cap; 705 706 va_copy(cap, ap); 707 /* No mutex needed; DDB pauses all processors. */ 708 kprintf(fmt, TODDB, NULL, NULL, ap); 709 if (db_tee_msgbuf) 710 kprintf(fmt, TOLOG, NULL, NULL, cap); 711 va_end(cap); 712 } 713 714 #endif /* DDB */ 715 716 static void 717 kprintf_internal(const char *fmt, int oflags, void *vp, char *sbuf, ...) 718 { 719 va_list ap; 720 721 va_start(ap, sbuf); 722 (void)kprintf(fmt, oflags, vp, sbuf, ap); 723 va_end(ap); 724 } 725 726 /* 727 * Device autoconfiguration printf routines. These change their 728 * behavior based on the AB_* flags in boothowto. If AB_SILENT 729 * is set, messages never go to the console (but they still always 730 * go to the log). AB_VERBOSE overrides AB_SILENT. 731 */ 732 733 /* 734 * aprint_normal: Send to console unless AB_QUIET. Always goes 735 * to the log. 736 */ 737 static void 738 aprint_normal_internal(const char *prefix, const char *fmt, va_list ap) 739 { 740 int flags = TOLOG; 741 742 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 743 (boothowto & AB_VERBOSE) != 0) 744 flags |= TOCONS; 745 746 kprintf_lock(); 747 748 if (prefix) 749 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 750 kprintf(fmt, flags, NULL, NULL, ap); 751 752 kprintf_unlock(); 753 754 if (!panicstr) 755 logwakeup(); 756 } 757 758 void 759 aprint_normal(const char *fmt, ...) 760 { 761 va_list ap; 762 763 va_start(ap, fmt); 764 aprint_normal_internal(NULL, fmt, ap); 765 va_end(ap); 766 } 767 768 void 769 aprint_normal_dev(device_t dv, const char *fmt, ...) 770 { 771 va_list ap; 772 773 KASSERT(dv != NULL); 774 775 va_start(ap, fmt); 776 aprint_normal_internal(device_xname(dv), fmt, ap); 777 va_end(ap); 778 } 779 780 void 781 aprint_normal_ifnet(struct ifnet *ifp, const char *fmt, ...) 782 { 783 va_list ap; 784 785 KASSERT(ifp != NULL); 786 787 va_start(ap, fmt); 788 aprint_normal_internal(ifp->if_xname, fmt, ap); 789 va_end(ap); 790 } 791 792 /* 793 * aprint_error: Send to console unless AB_QUIET. Always goes 794 * to the log. Also counts the number of times called so other 795 * parts of the kernel can report the number of errors during a 796 * given phase of system startup. 797 */ 798 static int aprint_error_count; 799 800 int 801 aprint_get_error_count(void) 802 { 803 int count; 804 805 kprintf_lock(); 806 807 count = aprint_error_count; 808 aprint_error_count = 0; 809 810 kprintf_unlock(); 811 812 return (count); 813 } 814 815 static void 816 aprint_error_internal(const char *prefix, const char *fmt, va_list ap) 817 { 818 int flags = TOLOG; 819 820 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 821 (boothowto & AB_VERBOSE) != 0) 822 flags |= TOCONS; 823 824 kprintf_lock(); 825 826 aprint_error_count++; 827 828 if (prefix) 829 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 830 kprintf_internal("autoconfiguration error: ", TOLOG, NULL, NULL); 831 kprintf(fmt, flags, NULL, NULL, ap); 832 833 kprintf_unlock(); 834 835 if (!panicstr) 836 logwakeup(); 837 } 838 839 void 840 aprint_error(const char *fmt, ...) 841 { 842 va_list ap; 843 844 va_start(ap, fmt); 845 aprint_error_internal(NULL, fmt, ap); 846 va_end(ap); 847 } 848 849 void 850 aprint_error_dev(device_t dv, const char *fmt, ...) 851 { 852 va_list ap; 853 854 KASSERT(dv != NULL); 855 856 va_start(ap, fmt); 857 aprint_error_internal(device_xname(dv), fmt, ap); 858 va_end(ap); 859 } 860 861 void 862 aprint_error_ifnet(struct ifnet *ifp, const char *fmt, ...) 863 { 864 va_list ap; 865 866 KASSERT(ifp != NULL); 867 868 va_start(ap, fmt); 869 aprint_error_internal(ifp->if_xname, fmt, ap); 870 va_end(ap); 871 } 872 873 /* 874 * aprint_naive: Send to console only if AB_QUIET. Never goes 875 * to the log. 876 */ 877 static void 878 aprint_naive_internal(const char *prefix, const char *fmt, va_list ap) 879 { 880 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) != AB_QUIET) 881 return; 882 883 kprintf_lock(); 884 885 if (prefix) 886 kprintf_internal("%s: ", TOCONS, NULL, NULL, prefix); 887 kprintf(fmt, TOCONS, NULL, NULL, ap); 888 889 kprintf_unlock(); 890 } 891 892 void 893 aprint_naive(const char *fmt, ...) 894 { 895 va_list ap; 896 897 va_start(ap, fmt); 898 aprint_naive_internal(NULL, fmt, ap); 899 va_end(ap); 900 } 901 902 void 903 aprint_naive_dev(device_t dv, const char *fmt, ...) 904 { 905 va_list ap; 906 907 KASSERT(dv != NULL); 908 909 va_start(ap, fmt); 910 aprint_naive_internal(device_xname(dv), fmt, ap); 911 va_end(ap); 912 } 913 914 void 915 aprint_naive_ifnet(struct ifnet *ifp, const char *fmt, ...) 916 { 917 va_list ap; 918 919 KASSERT(ifp != NULL); 920 921 va_start(ap, fmt); 922 aprint_naive_internal(ifp->if_xname, fmt, ap); 923 va_end(ap); 924 } 925 926 /* 927 * aprint_verbose: Send to console only if AB_VERBOSE. Always 928 * goes to the log. 929 */ 930 static void 931 aprint_verbose_internal(const char *prefix, const char *fmt, va_list ap) 932 { 933 int flags = TOLOG; 934 935 if (boothowto & AB_VERBOSE) 936 flags |= TOCONS; 937 938 kprintf_lock(); 939 940 if (prefix) 941 kprintf_internal("%s: ", flags, NULL, NULL, prefix); 942 kprintf(fmt, flags, NULL, NULL, ap); 943 944 kprintf_unlock(); 945 946 if (!panicstr) 947 logwakeup(); 948 } 949 950 void 951 aprint_verbose(const char *fmt, ...) 952 { 953 va_list ap; 954 955 va_start(ap, fmt); 956 aprint_verbose_internal(NULL, fmt, ap); 957 va_end(ap); 958 } 959 960 void 961 aprint_verbose_dev(device_t dv, const char *fmt, ...) 962 { 963 va_list ap; 964 965 KASSERT(dv != NULL); 966 967 va_start(ap, fmt); 968 aprint_verbose_internal(device_xname(dv), fmt, ap); 969 va_end(ap); 970 } 971 972 void 973 aprint_verbose_ifnet(struct ifnet *ifp, const char *fmt, ...) 974 { 975 va_list ap; 976 977 KASSERT(ifp != NULL); 978 979 va_start(ap, fmt); 980 aprint_verbose_internal(ifp->if_xname, fmt, ap); 981 va_end(ap); 982 } 983 984 /* 985 * aprint_debug: Send to console and log only if AB_DEBUG. 986 */ 987 static void 988 aprint_debug_internal(const char *prefix, const char *fmt, va_list ap) 989 { 990 if ((boothowto & AB_DEBUG) == 0) 991 return; 992 993 kprintf_lock(); 994 995 if (prefix) 996 kprintf_internal("%s: ", TOCONS | TOLOG, NULL, NULL, prefix); 997 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 998 999 kprintf_unlock(); 1000 } 1001 1002 void 1003 aprint_debug(const char *fmt, ...) 1004 { 1005 va_list ap; 1006 1007 va_start(ap, fmt); 1008 aprint_debug_internal(NULL, fmt, ap); 1009 va_end(ap); 1010 } 1011 1012 void 1013 aprint_debug_dev(device_t dv, const char *fmt, ...) 1014 { 1015 va_list ap; 1016 1017 KASSERT(dv != NULL); 1018 1019 va_start(ap, fmt); 1020 aprint_debug_internal(device_xname(dv), fmt, ap); 1021 va_end(ap); 1022 } 1023 1024 void 1025 aprint_debug_ifnet(struct ifnet *ifp, const char *fmt, ...) 1026 { 1027 va_list ap; 1028 1029 KASSERT(ifp != NULL); 1030 1031 va_start(ap, fmt); 1032 aprint_debug_internal(ifp->if_xname, fmt, ap); 1033 va_end(ap); 1034 } 1035 1036 void 1037 vprintf_flags(int flags, const char *fmt, va_list ap) 1038 { 1039 kprintf_lock(); 1040 kprintf(fmt, flags, NULL, NULL, ap); 1041 kprintf_unlock(); 1042 } 1043 1044 void 1045 printf_flags(int flags, const char *fmt, ...) 1046 { 1047 va_list ap; 1048 1049 va_start(ap, fmt); 1050 vprintf_flags(flags, fmt, ap); 1051 va_end(ap); 1052 } 1053 1054 void 1055 printf_tolog(const char *fmt, ...) 1056 { 1057 va_list ap; 1058 1059 va_start(ap, fmt); 1060 vprintf_flags(TOLOG, fmt, ap); 1061 va_end(ap); 1062 } 1063 1064 /* 1065 * printf_nolog: Like printf(), but does not send message to the log. 1066 */ 1067 1068 void 1069 printf_nolog(const char *fmt, ...) 1070 { 1071 va_list ap; 1072 1073 va_start(ap, fmt); 1074 vprintf_flags(TOCONS, fmt, ap); 1075 va_end(ap); 1076 } 1077 1078 /* 1079 * printf_nostamp: Like printf(), but does not prepend a timestamp. 1080 */ 1081 1082 void 1083 printf_nostamp(const char *fmt, ...) 1084 { 1085 va_list ap; 1086 1087 va_start(ap, fmt); 1088 vprintf_flags(TOCONS|NOTSTAMP, fmt, ap); 1089 va_end(ap); 1090 } 1091 1092 /* 1093 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 1094 */ 1095 1096 /* 1097 * printf: print a message to the console and the log 1098 */ 1099 void 1100 printf(const char *fmt, ...) 1101 { 1102 va_list ap; 1103 1104 va_start(ap, fmt); 1105 vprintf_flags(TOCONS | TOLOG, fmt, ap); 1106 va_end(ap); 1107 } 1108 1109 /* 1110 * vprintf: print a message to the console and the log [already have 1111 * va_list] 1112 */ 1113 1114 void 1115 vprintf(const char *fmt, va_list ap) 1116 { 1117 vprintf_flags(TOCONS | TOLOG, fmt, ap); 1118 1119 if (!panicstr) 1120 logwakeup(); 1121 } 1122 1123 /* 1124 * snprintf: print a message to a buffer 1125 */ 1126 int 1127 snprintf(char *bf, size_t size, const char *fmt, ...) 1128 { 1129 int retval; 1130 va_list ap; 1131 1132 va_start(ap, fmt); 1133 retval = vsnprintf(bf, size, fmt, ap); 1134 va_end(ap); 1135 1136 return retval; 1137 } 1138 1139 /* 1140 * vsnprintf: print a message to a buffer [already have va_list] 1141 */ 1142 int 1143 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 1144 { 1145 int retval; 1146 char *p; 1147 1148 p = bf + size; 1149 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 1150 if (bf && size > 0) { 1151 /* nul terminate */ 1152 if (size <= (size_t)retval) 1153 bf[size - 1] = '\0'; 1154 else 1155 bf[retval] = '\0'; 1156 } 1157 return retval; 1158 } 1159 1160 int 1161 vasprintf(char **bf, const char *fmt, va_list ap) 1162 { 1163 int retval; 1164 va_list cap; 1165 1166 va_copy(cap, ap); 1167 retval = kprintf(fmt, TOBUFONLY, NULL, NULL, cap) + 1; 1168 va_end(cap); 1169 *bf = kmem_alloc(retval, KM_SLEEP); 1170 return vsnprintf(*bf, retval, fmt, ap); 1171 } 1172 1173 /* 1174 * kprintf: scaled down version of printf(3). 1175 * 1176 * this version based on vfprintf() from libc which was derived from 1177 * software contributed to Berkeley by Chris Torek. 1178 * 1179 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 1180 */ 1181 1182 /* 1183 * macros for converting digits to letters and vice versa 1184 */ 1185 #define to_digit(c) ((c) - '0') 1186 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1187 #define to_char(n) ((n) + '0') 1188 1189 /* 1190 * flags used during conversion. 1191 */ 1192 #define ALT 0x001 /* alternate form */ 1193 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1194 #define LADJUST 0x004 /* left adjustment */ 1195 #define LONGDBL 0x008 /* long double; unimplemented */ 1196 #define LONGINT 0x010 /* long integer */ 1197 #define QUADINT 0x020 /* quad integer */ 1198 #define SHORTINT 0x040 /* short integer */ 1199 #define MAXINT 0x080 /* intmax_t */ 1200 #define PTRINT 0x100 /* intptr_t */ 1201 #define SIZEINT 0x200 /* size_t */ 1202 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1203 #define FPT 0x800 /* Floating point number */ 1204 1205 /* 1206 * To extend shorts properly, we need both signed and unsigned 1207 * argument extraction methods. 1208 */ 1209 #define SARG() \ 1210 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1211 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1212 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1213 flags&QUADINT ? va_arg(ap, quad_t) : \ 1214 flags&LONGINT ? va_arg(ap, long) : \ 1215 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1216 (long)va_arg(ap, int)) 1217 #define UARG() \ 1218 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1219 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1220 flags&SIZEINT ? va_arg(ap, size_t) : \ 1221 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1222 flags&LONGINT ? va_arg(ap, u_long) : \ 1223 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1224 (u_long)va_arg(ap, u_int)) 1225 1226 #define KPRINTF_PUTCHAR(C) { \ 1227 if (oflags == TOBUFONLY) { \ 1228 if (sbuf && ((vp == NULL) || (sbuf < tailp))) \ 1229 *sbuf++ = (C); \ 1230 } else { \ 1231 putchar((C), oflags, vp); \ 1232 } \ 1233 } 1234 1235 void 1236 device_printf(device_t dev, const char *fmt, ...) 1237 { 1238 va_list ap; 1239 1240 kprintf_lock(); 1241 kprintf_internal("%s: ", TOCONS|TOLOG, NULL, NULL, device_xname(dev)); 1242 va_start(ap, fmt); 1243 kprintf(fmt, TOCONS|TOLOG, NULL, NULL, ap); 1244 va_end(ap); 1245 kprintf_unlock(); 1246 } 1247 1248 /* 1249 * Guts of kernel printf. Note, we already expect to be in a mutex! 1250 */ 1251 int 1252 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1253 { 1254 const char *fmt; /* format string */ 1255 int ch; /* character from fmt */ 1256 int n; /* handy integer (short term usage) */ 1257 char *cp; /* handy char pointer (short term usage) */ 1258 int flags; /* flags as above */ 1259 int ret; /* return value accumulator */ 1260 int width; /* width from format (%8d), or 0 */ 1261 int prec; /* precision from format (%.3d), or -1 */ 1262 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1263 1264 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1265 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1266 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1267 int realsz; /* field size expanded by dprec */ 1268 int size; /* size of converted field or string */ 1269 const char *xdigs; /* digits for [xX] conversion */ 1270 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1271 char *tailp; /* tail pointer for snprintf */ 1272 1273 if (oflags == TOBUFONLY && (vp != NULL)) 1274 tailp = *(char **)vp; 1275 else 1276 tailp = NULL; 1277 1278 cp = NULL; /* XXX: shutup gcc */ 1279 size = 0; /* XXX: shutup gcc */ 1280 1281 fmt = fmt0; 1282 ret = 0; 1283 1284 xdigs = NULL; /* XXX: shut up gcc warning */ 1285 1286 /* 1287 * Scan the format for conversions (`%' character). 1288 */ 1289 for (;;) { 1290 for (; *fmt != '%' && *fmt; fmt++) { 1291 ret++; 1292 KPRINTF_PUTCHAR(*fmt); 1293 } 1294 if (*fmt == 0) 1295 goto done; 1296 1297 fmt++; /* skip over '%' */ 1298 1299 flags = 0; 1300 dprec = 0; 1301 width = 0; 1302 prec = -1; 1303 sign = '\0'; 1304 1305 rflag: ch = *fmt++; 1306 reswitch: switch (ch) { 1307 case ' ': 1308 /* 1309 * ``If the space and + flags both appear, the space 1310 * flag will be ignored.'' 1311 * -- ANSI X3J11 1312 */ 1313 if (!sign) 1314 sign = ' '; 1315 goto rflag; 1316 case '#': 1317 flags |= ALT; 1318 goto rflag; 1319 case '*': 1320 /* 1321 * ``A negative field width argument is taken as a 1322 * - flag followed by a positive field width.'' 1323 * -- ANSI X3J11 1324 * They don't exclude field widths read from args. 1325 */ 1326 if ((width = va_arg(ap, int)) >= 0) 1327 goto rflag; 1328 width = -width; 1329 /* FALLTHROUGH */ 1330 case '-': 1331 flags |= LADJUST; 1332 goto rflag; 1333 case '+': 1334 sign = '+'; 1335 goto rflag; 1336 case '.': 1337 if ((ch = *fmt++) == '*') { 1338 n = va_arg(ap, int); 1339 prec = n < 0 ? -1 : n; 1340 goto rflag; 1341 } 1342 n = 0; 1343 while (is_digit(ch)) { 1344 n = 10 * n + to_digit(ch); 1345 ch = *fmt++; 1346 } 1347 prec = n < 0 ? -1 : n; 1348 goto reswitch; 1349 case '0': 1350 /* 1351 * ``Note that 0 is taken as a flag, not as the 1352 * beginning of a field width.'' 1353 * -- ANSI X3J11 1354 */ 1355 flags |= ZEROPAD; 1356 goto rflag; 1357 case '1': case '2': case '3': case '4': 1358 case '5': case '6': case '7': case '8': case '9': 1359 n = 0; 1360 do { 1361 n = 10 * n + to_digit(ch); 1362 ch = *fmt++; 1363 } while (is_digit(ch)); 1364 width = n; 1365 goto reswitch; 1366 case 'h': 1367 flags |= SHORTINT; 1368 goto rflag; 1369 case 'j': 1370 flags |= MAXINT; 1371 goto rflag; 1372 case 'l': 1373 if (*fmt == 'l') { 1374 fmt++; 1375 flags |= QUADINT; 1376 } else { 1377 flags |= LONGINT; 1378 } 1379 goto rflag; 1380 case 'q': 1381 flags |= QUADINT; 1382 goto rflag; 1383 case 't': 1384 flags |= PTRINT; 1385 goto rflag; 1386 case 'z': 1387 flags |= SIZEINT; 1388 goto rflag; 1389 case 'c': 1390 *(cp = bf) = va_arg(ap, int); 1391 size = 1; 1392 sign = '\0'; 1393 break; 1394 case 'D': 1395 flags |= LONGINT; 1396 /*FALLTHROUGH*/ 1397 case 'd': 1398 case 'i': 1399 _uquad = SARG(); 1400 if ((quad_t)_uquad < 0) { 1401 _uquad = -_uquad; 1402 sign = '-'; 1403 } 1404 base = DEC; 1405 goto number; 1406 case 'n': 1407 /* no %n support in the kernel, consume and skip */ 1408 if (flags & MAXINT) 1409 (void)va_arg(ap, intmax_t *); 1410 else if (flags & PTRINT) 1411 (void)va_arg(ap, intptr_t *); 1412 else if (flags & SIZEINT) 1413 (void)va_arg(ap, ssize_t *); 1414 else if (flags & QUADINT) 1415 (void)va_arg(ap, quad_t *); 1416 else if (flags & LONGINT) 1417 (void)va_arg(ap, long *); 1418 else if (flags & SHORTINT) 1419 (void)va_arg(ap, short *); 1420 else 1421 (void)va_arg(ap, int *); 1422 continue; /* no output */ 1423 case 'O': 1424 flags |= LONGINT; 1425 /*FALLTHROUGH*/ 1426 case 'o': 1427 _uquad = UARG(); 1428 base = OCT; 1429 goto nosign; 1430 case 'p': 1431 /* 1432 * ``The argument shall be a pointer to void. The 1433 * value of the pointer is converted to a sequence 1434 * of printable characters, in an implementation- 1435 * defined manner.'' 1436 * -- ANSI X3J11 1437 */ 1438 /* NOSTRICT */ 1439 _uquad = (u_long)va_arg(ap, void *); 1440 base = HEX; 1441 xdigs = hexdigits; 1442 flags |= HEXPREFIX; 1443 ch = 'x'; 1444 goto nosign; 1445 case 's': 1446 if ((cp = va_arg(ap, char *)) == NULL) 1447 /*XXXUNCONST*/ 1448 cp = __UNCONST("(null)"); 1449 if (prec >= 0) { 1450 /* 1451 * can't use strlen; can only look for the 1452 * NUL in the first `prec' characters, and 1453 * strlen() will go further. 1454 */ 1455 char *p = memchr(cp, 0, prec); 1456 1457 if (p != NULL) { 1458 size = p - cp; 1459 if (size > prec) 1460 size = prec; 1461 } else 1462 size = prec; 1463 } else 1464 size = strlen(cp); 1465 sign = '\0'; 1466 break; 1467 case 'U': 1468 flags |= LONGINT; 1469 /*FALLTHROUGH*/ 1470 case 'u': 1471 _uquad = UARG(); 1472 base = DEC; 1473 goto nosign; 1474 case 'X': 1475 xdigs = HEXDIGITS; 1476 goto hex; 1477 case 'x': 1478 xdigs = hexdigits; 1479 hex: _uquad = UARG(); 1480 base = HEX; 1481 /* leading 0x/X only if non-zero */ 1482 if (flags & ALT && _uquad != 0) 1483 flags |= HEXPREFIX; 1484 1485 /* unsigned conversions */ 1486 nosign: sign = '\0'; 1487 /* 1488 * ``... diouXx conversions ... if a precision is 1489 * specified, the 0 flag will be ignored.'' 1490 * -- ANSI X3J11 1491 */ 1492 number: if ((dprec = prec) >= 0) 1493 flags &= ~ZEROPAD; 1494 1495 /* 1496 * ``The result of converting a zero value with an 1497 * explicit precision of zero is no characters.'' 1498 * -- ANSI X3J11 1499 */ 1500 cp = bf + KPRINTF_BUFSIZE; 1501 if (_uquad != 0 || prec != 0) { 1502 /* 1503 * Unsigned mod is hard, and unsigned mod 1504 * by a constant is easier than that by 1505 * a variable; hence this switch. 1506 */ 1507 switch (base) { 1508 case OCT: 1509 do { 1510 *--cp = to_char(_uquad & 7); 1511 _uquad >>= 3; 1512 } while (_uquad); 1513 /* handle octal leading 0 */ 1514 if (flags & ALT && *cp != '0') 1515 *--cp = '0'; 1516 break; 1517 1518 case DEC: 1519 /* many numbers are 1 digit */ 1520 while (_uquad >= 10) { 1521 *--cp = to_char(_uquad % 10); 1522 _uquad /= 10; 1523 } 1524 *--cp = to_char(_uquad); 1525 break; 1526 1527 case HEX: 1528 do { 1529 *--cp = xdigs[_uquad & 15]; 1530 _uquad >>= 4; 1531 } while (_uquad); 1532 break; 1533 1534 default: 1535 /*XXXUNCONST*/ 1536 cp = __UNCONST("bug in kprintf: bad base"); 1537 size = strlen(cp); 1538 goto skipsize; 1539 } 1540 } 1541 size = bf + KPRINTF_BUFSIZE - cp; 1542 skipsize: 1543 break; 1544 default: /* "%?" prints ?, unless ? is NUL */ 1545 if (ch == '\0') 1546 goto done; 1547 /* pretend it was %c with argument ch */ 1548 cp = bf; 1549 *cp = ch; 1550 size = 1; 1551 sign = '\0'; 1552 break; 1553 } 1554 1555 /* 1556 * All reasonable formats wind up here. At this point, `cp' 1557 * points to a string which (if not flags&LADJUST) should be 1558 * padded out to `width' places. If flags&ZEROPAD, it should 1559 * first be prefixed by any sign or other prefix; otherwise, 1560 * it should be blank padded before the prefix is emitted. 1561 * After any left-hand padding and prefixing, emit zeroes 1562 * required by a decimal [diouxX] precision, then print the 1563 * string proper, then emit zeroes required by any leftover 1564 * floating precision; finally, if LADJUST, pad with blanks. 1565 * 1566 * Compute actual size, so we know how much to pad. 1567 * size excludes decimal prec; realsz includes it. 1568 */ 1569 realsz = dprec > size ? dprec : size; 1570 if (sign) 1571 realsz++; 1572 else if (flags & HEXPREFIX) 1573 realsz+= 2; 1574 1575 /* adjust ret */ 1576 ret += width > realsz ? width : realsz; 1577 1578 /* right-adjusting blank padding */ 1579 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1580 n = width - realsz; 1581 while (n-- > 0) 1582 KPRINTF_PUTCHAR(' '); 1583 } 1584 1585 /* prefix */ 1586 if (sign) { 1587 KPRINTF_PUTCHAR(sign); 1588 } else if (flags & HEXPREFIX) { 1589 KPRINTF_PUTCHAR('0'); 1590 KPRINTF_PUTCHAR(ch); 1591 } 1592 1593 /* right-adjusting zero padding */ 1594 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1595 n = width - realsz; 1596 while (n-- > 0) 1597 KPRINTF_PUTCHAR('0'); 1598 } 1599 1600 /* leading zeroes from decimal precision */ 1601 n = dprec - size; 1602 while (n-- > 0) 1603 KPRINTF_PUTCHAR('0'); 1604 1605 /* the string or number proper */ 1606 for (; size--; cp++) 1607 KPRINTF_PUTCHAR(*cp); 1608 /* left-adjusting padding (always blank) */ 1609 if (flags & LADJUST) { 1610 n = width - realsz; 1611 while (n-- > 0) 1612 KPRINTF_PUTCHAR(' '); 1613 } 1614 } 1615 1616 done: 1617 if ((oflags == TOBUFONLY) && (vp != NULL)) 1618 *(char **)vp = sbuf; 1619 (*v_flush)(); 1620 1621 #ifdef RND_PRINTF 1622 if (__predict_true(kprintf_inited)) 1623 rnd_add_data_intr(&rnd_printf_source, NULL, 0, 0); 1624 #endif 1625 return ret; 1626 } 1627
Indexes created Sat Sep 20 22:09:52 GMT 2025