1111 lines
24 KiB
C
1111 lines
24 KiB
C
/* $OpenBSD: subr_prf.c,v 1.106 2022/08/14 01:58:28 jsg Exp $ */
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/* $NetBSD: subr_prf.c,v 1.45 1997/10/24 18:14:25 chuck Exp $ */
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/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <sys/msgbuf.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/tprintf.h>
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#include <sys/syslog.h>
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#include <sys/pool.h>
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#include <sys/mutex.h>
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#include <dev/cons.h>
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/*
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* note that stdarg.h and the ansi style va_start macro is used for both
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* ansi and traditional c compilers.
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*/
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#include <sys/stdarg.h>
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#ifdef DDB
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#include <ddb/db_output.h> /* db_printf, db_putchar prototypes */
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#include <ddb/db_var.h> /* db_log, db_radix */
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#endif
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/*
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* defines
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*/
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/* flags for kprintf */
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#define TOCONS 0x01 /* to the console */
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#define TOTTY 0x02 /* to the process' tty */
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#define TOLOG 0x04 /* to the kernel message buffer */
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#define TOBUFONLY 0x08 /* to the buffer (only) [for snprintf] */
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#define TODDB 0x10 /* to ddb console */
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#define TOCOUNT 0x20 /* act like [v]snprintf */
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/* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */
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#define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2)
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/*
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* local prototypes
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*/
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int kprintf(const char *, int, void *, char *, va_list);
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void kputchar(int, int, struct tty *);
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struct mutex kprintf_mutex =
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MUTEX_INITIALIZER_FLAGS(IPL_HIGH, "kprintf", MTX_NOWITNESS);
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/*
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* globals
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*/
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extern int log_open; /* subr_log: is /dev/klog open? */
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const char *panicstr; /* arg to first call to panic (used as a flag
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to indicate that panic has already been called). */
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#ifdef DDB
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/*
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* Enter ddb on panic.
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*/
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int db_panic = 1;
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/*
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* db_console controls if we can be able to enter ddb by a special key
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* combination (machine dependent).
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* If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows
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* to break into console during boot. It's _really_ useful when debugging
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* some things in the kernel that can cause init(8) to crash.
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*/
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#ifdef DDB_SAFE_CONSOLE
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int db_console = 1;
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#else
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int db_console = 0;
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#endif
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#endif
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/*
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* panic on spl assertion failure?
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*/
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#ifdef SPLASSERT_WATCH
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int splassert_ctl = 3;
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#else
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int splassert_ctl = 1;
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#endif
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/*
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* v_putc: routine to putc on virtual console
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*
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* the v_putc pointer can be used to redirect the console cnputc elsewhere
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* [e.g. to a "virtual console"].
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*/
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void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */
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/*
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* Silence kernel printf when masquerading as a bootloader.
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*/
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#ifdef BOOT_QUIET
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int printf_flags = TOLOG;
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#else
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int printf_flags = TOCONS | TOLOG;
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#endif
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/*
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* functions
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*/
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/*
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* Partial support (the failure case) of the assertion facility
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* commonly found in userland.
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*/
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void
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__assert(const char *t, const char *f, int l, const char *e)
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{
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panic(__KASSERTSTR, t, e, f, l);
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}
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/*
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* tablefull: warn that a system table is full
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*/
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void
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tablefull(const char *tab)
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{
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log(LOG_ERR, "%s: table is full\n", tab);
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}
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/*
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* If we have panicked, prefer db_printf() and db_vprintf() where
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* available.
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*/
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#ifdef DDB
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#define panic_printf(...) db_printf(__VA_ARGS__)
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#define panic_vprintf(...) db_vprintf(__VA_ARGS__)
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#else
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#define panic_printf(...) printf(__VA_ARGS__)
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#define panic_vprintf(...) vprintf(__VA_ARGS__)
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#endif
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/*
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* panic: handle an unresolvable fatal error
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*
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* prints "panic: <message>" and reboots. if called twice (i.e. recursive
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* call) we avoid trying to sync the disk and just reboot (to avoid
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* recursive panics).
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*/
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void
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panic(const char *fmt, ...)
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{
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struct cpu_info *ci = curcpu();
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int bootopt;
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va_list ap;
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bootopt = RB_AUTOBOOT | RB_DUMP;
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if (atomic_cas_ptr(&panicstr, NULL, ci->ci_panicbuf) != NULL)
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bootopt |= RB_NOSYNC;
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/* do not trigger assertions, we know that we are inconsistent */
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splassert_ctl = 0;
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#ifdef BOOT_QUIET
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printf_flags |= TOCONS; /* make sure we see kernel printf output */
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#endif
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/*
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* All panic messages are printed, but only the first panic on a
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* given CPU is written to its panicbuf.
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*/
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if (ci->ci_panicbuf[0] == '\0') {
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va_start(ap, fmt);
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vsnprintf(ci->ci_panicbuf, sizeof(ci->ci_panicbuf), fmt, ap);
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va_end(ap);
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panic_printf("panic: %s\n", ci->ci_panicbuf);
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} else {
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panic_printf("panic: ");
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va_start(ap, fmt);
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panic_vprintf(fmt, ap);
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va_end(ap);
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panic_printf("\n");
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}
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#ifdef DDB
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if (db_panic)
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db_enter();
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else
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db_stack_dump();
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#endif
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reboot(bootopt);
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/* NOTREACHED */
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}
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/*
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* We print only the function name. The file name is usually very long and
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* would eat tons of space in the kernel.
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*/
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void
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splassert_fail(int wantipl, int haveipl, const char *func)
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{
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if (panicstr || db_active)
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return;
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printf("splassert: %s: want %d have %d\n", func, wantipl, haveipl);
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switch (splassert_ctl) {
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case 1:
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break;
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case 2:
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#ifdef DDB
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db_stack_dump();
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#endif
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break;
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case 3:
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#ifdef DDB
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db_stack_dump();
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db_enter();
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#endif
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break;
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default:
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panic("spl assertion failure in %s", func);
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}
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}
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/*
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* kernel logging functions: log, logpri, addlog
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*/
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/*
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* log: write to the log buffer
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*
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* => will not sleep [so safe to call from interrupt]
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* => will log to console if /dev/klog isn't open
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*/
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void
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log(int level, const char *fmt, ...)
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{
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int s;
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va_list ap;
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s = splhigh();
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logpri(level); /* log the level first */
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va_start(ap, fmt);
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kprintf(fmt, TOLOG, NULL, NULL, ap);
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va_end(ap);
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splx(s);
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if (!log_open) {
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va_start(ap, fmt);
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mtx_enter(&kprintf_mutex);
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kprintf(fmt, TOCONS, NULL, NULL, ap);
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mtx_leave(&kprintf_mutex);
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va_end(ap);
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}
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logwakeup(); /* wake up anyone waiting for log msgs */
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}
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/*
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* logpri: log the priority level to the klog
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*/
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void
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logpri(int level)
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{
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char *p;
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char snbuf[KPRINTF_BUFSIZE];
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kputchar('<', TOLOG, NULL);
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snprintf(snbuf, sizeof snbuf, "%d", level);
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for (p = snbuf ; *p ; p++)
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kputchar(*p, TOLOG, NULL);
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kputchar('>', TOLOG, NULL);
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}
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/*
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* addlog: add info to previous log message
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*/
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int
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addlog(const char *fmt, ...)
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{
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int s;
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va_list ap;
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s = splhigh();
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va_start(ap, fmt);
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kprintf(fmt, TOLOG, NULL, NULL, ap);
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va_end(ap);
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splx(s);
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if (!log_open) {
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va_start(ap, fmt);
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mtx_enter(&kprintf_mutex);
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kprintf(fmt, TOCONS, NULL, NULL, ap);
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mtx_leave(&kprintf_mutex);
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va_end(ap);
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}
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logwakeup();
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return(0);
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}
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/*
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* kputchar: print a single character on console or user terminal.
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*
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* => if console, then the last MSGBUFS chars are saved in msgbuf
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* for inspection later (e.g. dmesg/syslog)
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*/
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void
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kputchar(int c, int flags, struct tty *tp)
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{
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extern int msgbufmapped;
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if (panicstr)
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constty = NULL;
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if ((flags & TOCONS) && tp == NULL && constty != NULL && !db_active) {
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tp = constty;
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flags |= TOTTY;
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}
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if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
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(flags & TOCONS) && tp == constty)
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constty = NULL;
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if ((flags & TOLOG) &&
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c != '\0' && c != '\r' && c != 0177 && msgbufmapped)
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msgbuf_putchar(msgbufp, c);
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if ((flags & TOCONS) && (constty == NULL || db_active) && c != '\0')
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(*v_putc)(c);
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#ifdef DDB
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if (flags & TODDB)
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db_putchar(c);
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#endif
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}
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/*
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* uprintf: print to the controlling tty of the current process
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*
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* => we may block if the tty queue is full
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* => no message is printed if the queue doesn't clear in a reasonable
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* time
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*/
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void
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uprintf(const char *fmt, ...)
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{
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struct process *pr = curproc->p_p;
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va_list ap;
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if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) {
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va_start(ap, fmt);
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kprintf(fmt, TOTTY, pr->ps_session->s_ttyp, NULL, ap);
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va_end(ap);
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}
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}
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#if defined(NFSSERVER) || defined(NFSCLIENT)
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/*
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* tprintf functions: used to send messages to a specific process
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*
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* usage:
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* get a tpr_t handle on a process "p" by using "tprintf_open(p)"
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* use the handle when calling "tprintf"
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* when done, do a "tprintf_close" to drop the handle
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*/
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/*
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* tprintf_open: get a tprintf handle on a process "p"
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* XXX change s/proc/process
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*
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* => returns NULL if process can't be printed to
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*/
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tpr_t
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tprintf_open(struct proc *p)
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{
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struct process *pr = p->p_p;
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if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) {
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SESSHOLD(pr->ps_session);
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return ((tpr_t)pr->ps_session);
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}
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return ((tpr_t) NULL);
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}
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/*
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* tprintf_close: dispose of a tprintf handle obtained with tprintf_open
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*/
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void
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tprintf_close(tpr_t sess)
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{
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if (sess)
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SESSRELE((struct session *) sess);
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}
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/*
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* tprintf: given tprintf handle to a process [obtained with tprintf_open],
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* send a message to the controlling tty for that process.
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*
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* => also sends message to /dev/klog
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*/
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void
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tprintf(tpr_t tpr, const char *fmt, ...)
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{
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struct session *sess = (struct session *)tpr;
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struct tty *tp = NULL;
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int flags = TOLOG;
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va_list ap;
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logpri(LOG_INFO);
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if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
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flags |= TOTTY;
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tp = sess->s_ttyp;
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}
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va_start(ap, fmt);
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kprintf(fmt, flags, tp, NULL, ap);
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va_end(ap);
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logwakeup();
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}
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#endif /* NFSSERVER || NFSCLIENT */
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/*
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* ttyprintf: send a message to a specific tty
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*
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* => should be used only by tty driver or anything that knows the
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* underlying tty will not be revoked(2)'d away. [otherwise,
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* use tprintf]
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*/
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void
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ttyprintf(struct tty *tp, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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kprintf(fmt, TOTTY, tp, NULL, ap);
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va_end(ap);
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}
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#ifdef DDB
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/*
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* db_printf: printf for DDB (via db_putchar)
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*/
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int
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db_printf(const char *fmt, ...)
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{
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va_list ap;
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int retval;
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va_start(ap, fmt);
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retval = db_vprintf(fmt, ap);
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va_end(ap);
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return(retval);
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}
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int
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db_vprintf(const char *fmt, va_list ap)
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{
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int flags;
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flags = TODDB;
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if (db_log)
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flags |= TOLOG;
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return (kprintf(fmt, flags, NULL, NULL, ap));
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}
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#endif /* DDB */
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/*
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* normal kernel printf functions: printf, vprintf, snprintf
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*/
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/*
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* printf: print a message to the console and the log
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*/
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int
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printf(const char *fmt, ...)
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{
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va_list ap;
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int retval;
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va_start(ap, fmt);
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mtx_enter(&kprintf_mutex);
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retval = kprintf(fmt, printf_flags, NULL, NULL, ap);
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mtx_leave(&kprintf_mutex);
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va_end(ap);
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if (!panicstr)
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logwakeup();
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return(retval);
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}
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/*
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* vprintf: print a message to the console and the log [already have a
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* va_list]
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*/
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int
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vprintf(const char *fmt, va_list ap)
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{
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int retval;
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mtx_enter(&kprintf_mutex);
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retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap);
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mtx_leave(&kprintf_mutex);
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if (!panicstr)
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logwakeup();
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return (retval);
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}
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/*
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* snprintf: print a message to a buffer
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*/
|
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int
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snprintf(char *buf, size_t size, const char *fmt, ...)
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{
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int retval;
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|
va_list ap;
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|
char *p;
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p = buf;
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|
if (size > 0)
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|
p += size - 1;
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va_start(ap, fmt);
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|
retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap);
|
|
va_end(ap);
|
|
if (size > 0)
|
|
*p = '\0'; /* null terminate */
|
|
return(retval);
|
|
}
|
|
|
|
/*
|
|
* vsnprintf: print a message to a buffer [already have va_alist]
|
|
*/
|
|
int
|
|
vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
|
|
{
|
|
int retval;
|
|
char *p;
|
|
|
|
p = buf + size - 1;
|
|
if (size < 1)
|
|
p = buf;
|
|
retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap);
|
|
if (size > 0)
|
|
*(p) = 0; /* null terminate */
|
|
return(retval);
|
|
}
|
|
|
|
/*
|
|
* kprintf: scaled down version of printf(3).
|
|
*
|
|
* this version based on vfprintf() from libc which was derived from
|
|
* software contributed to Berkeley by Chris Torek.
|
|
*
|
|
* The additional format %b is supported to decode error registers.
|
|
* Its usage is:
|
|
*
|
|
* printf("reg=%b\n", regval, "<base><arg>*");
|
|
*
|
|
* where <base> is the output base expressed as a control character, e.g.
|
|
* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
|
|
* the first of which gives the bit number to be inspected (origin 1), and
|
|
* the next characters (up to a control character, i.e. a character <= 32),
|
|
* give the name of the register. Thus:
|
|
*
|
|
* kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
|
|
*
|
|
* would produce output:
|
|
*
|
|
* reg=3<BITTWO,BITONE>
|
|
*
|
|
* To support larger integers (> 32 bits), %b formatting will also accept
|
|
* control characters in the region 0x80 - 0xff. 0x80 refers to bit 0,
|
|
* 0x81 refers to bit 1, and so on. The equivalent string to the above is:
|
|
*
|
|
* kprintf("reg=%b\n", 3, "\10\201BITTWO\200BITONE\n");
|
|
*
|
|
* and would produce the same output.
|
|
*
|
|
* Like the rest of printf, %b can be prefixed to handle various size
|
|
* modifiers, eg. %b is for "int", %lb is for "long", and %llb supports
|
|
* "long long".
|
|
*
|
|
* This code is large and complicated...
|
|
*/
|
|
|
|
/*
|
|
* macros for converting digits to letters and vice versa
|
|
*/
|
|
#define to_digit(c) ((c) - '0')
|
|
#define is_digit(c) ((unsigned)to_digit(c) <= 9)
|
|
#define to_char(n) ((n) + '0')
|
|
|
|
/*
|
|
* flags used during conversion.
|
|
*/
|
|
#define ALT 0x001 /* alternate form */
|
|
#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
|
|
#define LADJUST 0x004 /* left adjustment */
|
|
#define LONGDBL 0x008 /* long double; unimplemented */
|
|
#define LONGINT 0x010 /* long integer */
|
|
#define QUADINT 0x020 /* quad integer */
|
|
#define SHORTINT 0x040 /* short integer */
|
|
#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
|
|
#define FPT 0x100 /* Floating point number */
|
|
#define SIZEINT 0x200 /* (signed) size_t */
|
|
|
|
/*
|
|
* To extend shorts properly, we need both signed and unsigned
|
|
* argument extraction methods.
|
|
*/
|
|
#define SARG() \
|
|
(flags&QUADINT ? va_arg(ap, quad_t) : \
|
|
flags&LONGINT ? va_arg(ap, long) : \
|
|
flags&SIZEINT ? va_arg(ap, ssize_t) : \
|
|
flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
|
|
(long)va_arg(ap, int))
|
|
#define UARG() \
|
|
(flags&QUADINT ? va_arg(ap, u_quad_t) : \
|
|
flags&LONGINT ? va_arg(ap, u_long) : \
|
|
flags&SIZEINT ? va_arg(ap, size_t) : \
|
|
flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
|
|
(u_long)va_arg(ap, u_int))
|
|
|
|
#define KPRINTF_PUTCHAR(C) do { \
|
|
int chr = (C); \
|
|
ret += 1; \
|
|
if (oflags & TOBUFONLY) { \
|
|
if ((vp != NULL) && (sbuf == tailp)) { \
|
|
if (!(oflags & TOCOUNT)) \
|
|
goto overflow; \
|
|
} else \
|
|
*sbuf++ = chr; \
|
|
} else { \
|
|
kputchar(chr, oflags, (struct tty *)vp); \
|
|
} \
|
|
} while(0)
|
|
|
|
int
|
|
kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap)
|
|
{
|
|
char *fmt; /* format string */
|
|
int ch; /* character from fmt */
|
|
int n; /* handy integer (short term usage) */
|
|
char *cp = NULL; /* handy char pointer (short term usage) */
|
|
int flags; /* flags as above */
|
|
int ret; /* return value accumulator */
|
|
int width; /* width from format (%8d), or 0 */
|
|
int prec; /* precision from format (%.3d), or -1 */
|
|
char sign; /* sign prefix (' ', '+', '-', or \0) */
|
|
|
|
u_quad_t _uquad; /* integer arguments %[diouxX] */
|
|
enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
|
|
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
|
|
int realsz; /* field size expanded by dprec */
|
|
int size = 0; /* size of converted field or string */
|
|
char *xdigs = NULL; /* digits for [xX] conversion */
|
|
char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */
|
|
char *tailp = NULL; /* tail pointer for snprintf */
|
|
|
|
if (oflags & TOCONS)
|
|
MUTEX_ASSERT_LOCKED(&kprintf_mutex);
|
|
|
|
if ((oflags & TOBUFONLY) && (vp != NULL))
|
|
tailp = *(char **)vp;
|
|
|
|
fmt = (char *)fmt0;
|
|
ret = 0;
|
|
|
|
/*
|
|
* Scan the format for conversions (`%' character).
|
|
*/
|
|
for (;;) {
|
|
while (*fmt != '%' && *fmt) {
|
|
KPRINTF_PUTCHAR(*fmt++);
|
|
}
|
|
if (*fmt == 0)
|
|
goto done;
|
|
|
|
fmt++; /* skip over '%' */
|
|
|
|
flags = 0;
|
|
dprec = 0;
|
|
width = 0;
|
|
prec = -1;
|
|
sign = '\0';
|
|
|
|
rflag: ch = *fmt++;
|
|
reswitch: switch (ch) {
|
|
/* XXX: non-standard '%b' format */
|
|
case 'b': {
|
|
char *b, *z;
|
|
int tmp;
|
|
_uquad = UARG();
|
|
b = va_arg(ap, char *);
|
|
if (*b == 8)
|
|
snprintf(buf, sizeof buf, "%llo", _uquad);
|
|
else if (*b == 10)
|
|
snprintf(buf, sizeof buf, "%lld", _uquad);
|
|
else if (*b == 16)
|
|
snprintf(buf, sizeof buf, "%llx", _uquad);
|
|
else
|
|
break;
|
|
b++;
|
|
|
|
z = buf;
|
|
while (*z) {
|
|
KPRINTF_PUTCHAR(*z++);
|
|
}
|
|
|
|
if (_uquad) {
|
|
tmp = 0;
|
|
while ((n = *b++) != 0) {
|
|
if (n & 0x80)
|
|
n &= 0x7f;
|
|
else if (n <= ' ')
|
|
n = n - 1;
|
|
if (_uquad & (1LL << n)) {
|
|
KPRINTF_PUTCHAR(tmp ? ',':'<');
|
|
while (*b > ' ' &&
|
|
(*b & 0x80) == 0) {
|
|
KPRINTF_PUTCHAR(*b);
|
|
b++;
|
|
}
|
|
tmp = 1;
|
|
} else {
|
|
while (*b > ' ' &&
|
|
(*b & 0x80) == 0)
|
|
b++;
|
|
}
|
|
}
|
|
if (tmp) {
|
|
KPRINTF_PUTCHAR('>');
|
|
}
|
|
}
|
|
continue; /* no output */
|
|
}
|
|
|
|
case ' ':
|
|
/*
|
|
* ``If the space and + flags both appear, the space
|
|
* flag will be ignored.''
|
|
* -- ANSI X3J11
|
|
*/
|
|
if (!sign)
|
|
sign = ' ';
|
|
goto rflag;
|
|
case '#':
|
|
flags |= ALT;
|
|
goto rflag;
|
|
case '*':
|
|
/*
|
|
* ``A negative field width argument is taken as a
|
|
* - flag followed by a positive field width.''
|
|
* -- ANSI X3J11
|
|
* They don't exclude field widths read from args.
|
|
*/
|
|
if ((width = va_arg(ap, int)) >= 0)
|
|
goto rflag;
|
|
width = -width;
|
|
/* FALLTHROUGH */
|
|
case '-':
|
|
flags |= LADJUST;
|
|
goto rflag;
|
|
case '+':
|
|
sign = '+';
|
|
goto rflag;
|
|
case '.':
|
|
if ((ch = *fmt++) == '*') {
|
|
n = va_arg(ap, int);
|
|
prec = n < 0 ? -1 : n;
|
|
goto rflag;
|
|
}
|
|
n = 0;
|
|
while (is_digit(ch)) {
|
|
n = 10 * n + to_digit(ch);
|
|
ch = *fmt++;
|
|
}
|
|
prec = n < 0 ? -1 : n;
|
|
goto reswitch;
|
|
case '0':
|
|
/*
|
|
* ``Note that 0 is taken as a flag, not as the
|
|
* beginning of a field width.''
|
|
* -- ANSI X3J11
|
|
*/
|
|
flags |= ZEROPAD;
|
|
goto rflag;
|
|
case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
n = 0;
|
|
do {
|
|
n = 10 * n + to_digit(ch);
|
|
ch = *fmt++;
|
|
} while (is_digit(ch));
|
|
width = n;
|
|
goto reswitch;
|
|
case 'h':
|
|
flags |= SHORTINT;
|
|
goto rflag;
|
|
case 'l':
|
|
if (*fmt == 'l') {
|
|
fmt++;
|
|
flags |= QUADINT;
|
|
} else {
|
|
flags |= LONGINT;
|
|
}
|
|
goto rflag;
|
|
case 'q':
|
|
flags |= QUADINT;
|
|
goto rflag;
|
|
case 'z':
|
|
flags |= SIZEINT;
|
|
goto rflag;
|
|
case 'c':
|
|
*(cp = buf) = va_arg(ap, int);
|
|
size = 1;
|
|
sign = '\0';
|
|
break;
|
|
case 't':
|
|
/* ptrdiff_t */
|
|
/* FALLTHROUGH */
|
|
case 'D':
|
|
flags |= LONGINT;
|
|
/*FALLTHROUGH*/
|
|
case 'd':
|
|
case 'i':
|
|
_uquad = SARG();
|
|
if ((quad_t)_uquad < 0) {
|
|
_uquad = -_uquad;
|
|
sign = '-';
|
|
}
|
|
base = DEC;
|
|
goto number;
|
|
case 'n':
|
|
panic("no %%n support");
|
|
break;
|
|
case 'O':
|
|
flags |= LONGINT;
|
|
/*FALLTHROUGH*/
|
|
case 'o':
|
|
_uquad = UARG();
|
|
base = OCT;
|
|
goto nosign;
|
|
case 'p':
|
|
/*
|
|
* ``The argument shall be a pointer to void. The
|
|
* value of the pointer is converted to a sequence
|
|
* of printable characters, in an implementation-
|
|
* defined manner.''
|
|
* -- ANSI X3J11
|
|
*/
|
|
_uquad = (u_long)va_arg(ap, void *);
|
|
base = HEX;
|
|
xdigs = "0123456789abcdef";
|
|
flags |= HEXPREFIX;
|
|
ch = 'x';
|
|
goto nosign;
|
|
case 's':
|
|
if ((cp = va_arg(ap, char *)) == NULL)
|
|
cp = "(null)";
|
|
if (prec >= 0) {
|
|
/*
|
|
* can't use strlen; can only look for the
|
|
* NUL in the first `prec' characters, and
|
|
* strlen() will go further.
|
|
*/
|
|
char *p = memchr(cp, 0, prec);
|
|
|
|
if (p != NULL) {
|
|
size = p - cp;
|
|
if (size > prec)
|
|
size = prec;
|
|
} else
|
|
size = prec;
|
|
} else
|
|
size = strlen(cp);
|
|
sign = '\0';
|
|
break;
|
|
case 'U':
|
|
flags |= LONGINT;
|
|
/*FALLTHROUGH*/
|
|
case 'u':
|
|
_uquad = UARG();
|
|
base = DEC;
|
|
goto nosign;
|
|
case 'X':
|
|
xdigs = "0123456789ABCDEF";
|
|
goto hex;
|
|
case 'x':
|
|
xdigs = "0123456789abcdef";
|
|
hex: _uquad = UARG();
|
|
base = HEX;
|
|
/* leading 0x/X only if non-zero */
|
|
if (flags & ALT && _uquad != 0)
|
|
flags |= HEXPREFIX;
|
|
|
|
/* unsigned conversions */
|
|
nosign: sign = '\0';
|
|
/*
|
|
* ``... diouXx conversions ... if a precision is
|
|
* specified, the 0 flag will be ignored.''
|
|
* -- ANSI X3J11
|
|
*/
|
|
number: if ((dprec = prec) >= 0)
|
|
flags &= ~ZEROPAD;
|
|
|
|
/*
|
|
* ``The result of converting a zero value with an
|
|
* explicit precision of zero is no characters.''
|
|
* -- ANSI X3J11
|
|
*/
|
|
cp = buf + KPRINTF_BUFSIZE;
|
|
if (_uquad != 0 || prec != 0) {
|
|
/*
|
|
* Unsigned mod is hard, and unsigned mod
|
|
* by a constant is easier than that by
|
|
* a variable; hence this switch.
|
|
*/
|
|
switch (base) {
|
|
case OCT:
|
|
do {
|
|
*--cp = to_char(_uquad & 7);
|
|
_uquad >>= 3;
|
|
} while (_uquad);
|
|
/* handle octal leading 0 */
|
|
if (flags & ALT && *cp != '0')
|
|
*--cp = '0';
|
|
break;
|
|
|
|
case DEC:
|
|
/* many numbers are 1 digit */
|
|
while (_uquad >= 10) {
|
|
*--cp = to_char(_uquad % 10);
|
|
_uquad /= 10;
|
|
}
|
|
*--cp = to_char(_uquad);
|
|
break;
|
|
|
|
case HEX:
|
|
do {
|
|
*--cp = xdigs[_uquad & 15];
|
|
_uquad >>= 4;
|
|
} while (_uquad);
|
|
break;
|
|
|
|
default:
|
|
cp = "bug in kprintf: bad base";
|
|
size = strlen(cp);
|
|
goto skipsize;
|
|
}
|
|
}
|
|
size = buf + KPRINTF_BUFSIZE - cp;
|
|
skipsize:
|
|
break;
|
|
default: /* "%?" prints ?, unless ? is NUL */
|
|
if (ch == '\0')
|
|
goto done;
|
|
/* pretend it was %c with argument ch */
|
|
cp = buf;
|
|
*cp = ch;
|
|
size = 1;
|
|
sign = '\0';
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* All reasonable formats wind up here. At this point, `cp'
|
|
* points to a string which (if not flags&LADJUST) should be
|
|
* padded out to `width' places. If flags&ZEROPAD, it should
|
|
* first be prefixed by any sign or other prefix; otherwise,
|
|
* it should be blank padded before the prefix is emitted.
|
|
* After any left-hand padding and prefixing, emit zeroes
|
|
* required by a decimal [diouxX] precision, then print the
|
|
* string proper, then emit zeroes required by any leftover
|
|
* floating precision; finally, if LADJUST, pad with blanks.
|
|
*
|
|
* Compute actual size, so we know how much to pad.
|
|
* size excludes decimal prec; realsz includes it.
|
|
*/
|
|
realsz = dprec > size ? dprec : size;
|
|
if (sign)
|
|
realsz++;
|
|
else if (flags & HEXPREFIX)
|
|
realsz+= 2;
|
|
|
|
/* right-adjusting blank padding */
|
|
if ((flags & (LADJUST|ZEROPAD)) == 0) {
|
|
n = width - realsz;
|
|
while (n-- > 0)
|
|
KPRINTF_PUTCHAR(' ');
|
|
}
|
|
|
|
/* prefix */
|
|
if (sign) {
|
|
KPRINTF_PUTCHAR(sign);
|
|
} else if (flags & HEXPREFIX) {
|
|
KPRINTF_PUTCHAR('0');
|
|
KPRINTF_PUTCHAR(ch);
|
|
}
|
|
|
|
/* right-adjusting zero padding */
|
|
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) {
|
|
n = width - realsz;
|
|
while (n-- > 0)
|
|
KPRINTF_PUTCHAR('0');
|
|
}
|
|
|
|
/* leading zeroes from decimal precision */
|
|
n = dprec - size;
|
|
while (n-- > 0)
|
|
KPRINTF_PUTCHAR('0');
|
|
|
|
/* the string or number proper */
|
|
while (size--)
|
|
KPRINTF_PUTCHAR(*cp++);
|
|
/* left-adjusting padding (always blank) */
|
|
if (flags & LADJUST) {
|
|
n = width - realsz;
|
|
while (n-- > 0)
|
|
KPRINTF_PUTCHAR(' ');
|
|
}
|
|
}
|
|
|
|
done:
|
|
if ((oflags & TOBUFONLY) && (vp != NULL))
|
|
*(char **)vp = sbuf;
|
|
overflow:
|
|
return (ret);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#if __GNUC_PREREQ__(2,96)
|
|
/*
|
|
* XXX - these functions shouldn't be in the kernel, but gcc 3.X feels like
|
|
* translating some printf calls to puts and since it doesn't seem
|
|
* possible to just turn off parts of those optimizations (some of
|
|
* them are really useful), we have to provide a dummy puts and putchar
|
|
* that are wrappers around printf.
|
|
*/
|
|
int puts(const char *);
|
|
int putchar(int c);
|
|
|
|
int
|
|
puts(const char *str)
|
|
{
|
|
printf("%s\n", str);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
putchar(int c)
|
|
{
|
|
printf("%c", c);
|
|
|
|
return (c);
|
|
}
|
|
|
|
|
|
#endif
|