8e1b797456
output to permanently (not ephemerally) go to the console. It is also sent to any other console specified by TIOCCONS as normal. While I'm here, document the kern.log_console_output sysctl.
978 lines
21 KiB
C
978 lines
21 KiB
C
/*-
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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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* 4. 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/kernel.h>
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#include <sys/msgbuf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/stddef.h>
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#include <sys/sysctl.h>
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#include <sys/tty.h>
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#include <sys/syslog.h>
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#include <sys/cons.h>
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#include <sys/uio.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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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 <machine/stdarg.h>
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#define TOCONS 0x01
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#define TOTTY 0x02
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#define TOLOG 0x04
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/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
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#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
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struct putchar_arg {
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int flags;
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int pri;
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struct tty *tty;
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};
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struct snprintf_arg {
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char *str;
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size_t remain;
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};
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extern int log_open;
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static void msglogchar(int c, int pri);
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static void putchar(int ch, void *arg);
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static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len);
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static void snprintf_func(int ch, void *arg);
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static int consintr = 1; /* Ok to handle console interrupts? */
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static int msgbufmapped; /* Set when safe to use msgbuf */
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int msgbuftrigger;
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static int log_console_output = 1;
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TUNABLE_INT("kern.log_console_output", &log_console_output);
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SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
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&log_console_output, 0, "Duplicate console output to the syslog.");
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static int always_console_output = 0;
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TUNABLE_INT("kern.always_console_output", &always_console_output);
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SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
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&always_console_output, 0, "Always output to console despite TIOCCONS.");
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/*
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* 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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* Uprintf prints to the controlling terminal for the current process.
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* It may block if the tty queue is overfull. No message is printed if
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* the queue does not clear in a reasonable time.
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*/
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int
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uprintf(const char *fmt, ...)
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{
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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va_list ap;
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struct putchar_arg pca;
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int retval;
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if (td == NULL || td == PCPU_GET(idlethread))
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return (0);
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p = td->td_proc;
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PROC_LOCK(p);
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if ((p->p_flag & P_CONTROLT) == 0) {
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PROC_UNLOCK(p);
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return (0);
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}
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SESS_LOCK(p->p_session);
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pca.tty = p->p_session->s_ttyp;
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SESS_UNLOCK(p->p_session);
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PROC_UNLOCK(p);
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if (pca.tty == NULL)
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return (0);
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pca.flags = TOTTY;
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va_start(ap, fmt);
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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return (retval);
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}
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/*
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* tprintf prints on the controlling terminal associated
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* with the given session, possibly to the log as well.
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*/
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void
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tprintf(struct proc *p, int pri, const char *fmt, ...)
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{
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struct tty *tp = NULL;
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int flags = 0;
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va_list ap;
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struct putchar_arg pca;
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struct session *sess = NULL;
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if (pri != -1)
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flags |= TOLOG;
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if (p != NULL) {
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PROC_LOCK(p);
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if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
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sess = p->p_session;
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SESS_LOCK(sess);
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PROC_UNLOCK(p);
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SESSHOLD(sess);
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tp = sess->s_ttyp;
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SESS_UNLOCK(sess);
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if (ttycheckoutq(tp, 0))
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flags |= TOTTY;
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else
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tp = NULL;
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} else
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PROC_UNLOCK(p);
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}
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pca.pri = pri;
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pca.tty = tp;
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pca.flags = flags;
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va_start(ap, fmt);
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kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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if (sess != NULL) {
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SESS_LOCK(sess);
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SESSRELE(sess);
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SESS_UNLOCK(sess);
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}
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msgbuftrigger = 1;
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}
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/*
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* Ttyprintf displays a message on a tty; it should be used only by
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* the tty driver, or anything that knows the underlying tty will not
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* be revoke(2)'d away. Other callers should use tprintf.
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*/
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int
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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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struct putchar_arg pca;
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int retval;
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va_start(ap, fmt);
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pca.tty = tp;
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pca.flags = TOTTY;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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return (retval);
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}
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/*
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* Log writes to the log buffer, and guarantees not to sleep (so can be
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* called by interrupt routines). If there is no process reading the
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* log yet, it writes to the console also.
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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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va_list ap;
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struct putchar_arg pca;
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pca.tty = NULL;
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pca.pri = level;
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pca.flags = log_open ? TOLOG : TOCONS;
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va_start(ap, fmt);
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kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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msgbuftrigger = 1;
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}
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#define CONSCHUNK 128
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void
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log_console(struct uio *uio)
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{
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int c, i, error, iovlen, nl;
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struct uio muio;
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struct iovec *miov = NULL;
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char *consbuffer;
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int pri;
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if (!log_console_output)
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return;
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pri = LOG_INFO | LOG_CONSOLE;
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muio = *uio;
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iovlen = uio->uio_iovcnt * sizeof (struct iovec);
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MALLOC(miov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
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MALLOC(consbuffer, char *, CONSCHUNK, M_TEMP, M_WAITOK);
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bcopy(muio.uio_iov, miov, iovlen);
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muio.uio_iov = miov;
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uio = &muio;
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nl = 0;
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while (uio->uio_resid > 0) {
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c = imin(uio->uio_resid, CONSCHUNK);
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error = uiomove(consbuffer, c, uio);
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if (error != 0)
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break;
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for (i = 0; i < c; i++) {
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msglogchar(consbuffer[i], pri);
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if (consbuffer[i] == '\n')
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nl = 1;
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else
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nl = 0;
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}
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}
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if (!nl)
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msglogchar('\n', pri);
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msgbuftrigger = 1;
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FREE(miov, M_TEMP);
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FREE(consbuffer, M_TEMP);
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return;
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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 savintr;
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struct putchar_arg pca;
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int retval;
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savintr = consintr; /* disable interrupts */
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consintr = 0;
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va_start(ap, fmt);
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pca.tty = NULL;
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pca.flags = TOCONS | TOLOG;
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pca.pri = -1;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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if (!panicstr)
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msgbuftrigger = 1;
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consintr = savintr; /* reenable interrupts */
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return (retval);
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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 savintr;
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struct putchar_arg pca;
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int retval;
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savintr = consintr; /* disable interrupts */
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consintr = 0;
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pca.tty = NULL;
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pca.flags = TOCONS | TOLOG;
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pca.pri = -1;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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if (!panicstr)
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msgbuftrigger = 1;
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consintr = savintr; /* reenable interrupts */
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return (retval);
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}
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/*
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* Print a character on console or users terminal. If destination is
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* the console then the last bunch of characters are saved in msgbuf for
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* inspection later.
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*/
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static void
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putchar(int c, void *arg)
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{
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struct putchar_arg *ap = (struct putchar_arg*) arg;
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struct tty *tp = ap->tty;
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int consdirect, flags = ap->flags;
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consdirect = ((flags & TOCONS) && constty == NULL);
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/* Don't use the tty code after a panic or while in ddb. */
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if (panicstr)
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consdirect = 1;
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#ifdef DDB
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if (db_active)
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consdirect = 1;
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#endif
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if (consdirect) {
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if (c != '\0')
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cnputc(c);
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} else {
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if ((flags & TOTTY) && tp != NULL)
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tputchar(c, tp);
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if (flags & TOCONS) {
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if (constty != NULL)
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msgbuf_addchar(&consmsgbuf, c);
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if (always_console_output && c != '\0')
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cnputc(c);
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}
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}
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if ((flags & TOLOG))
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msglogchar(c, ap->pri);
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}
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/*
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* Scaled down version of sprintf(3).
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*/
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int
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sprintf(char *buf, const char *cfmt, ...)
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{
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int retval;
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va_list ap;
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va_start(ap, cfmt);
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retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
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buf[retval] = '\0';
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va_end(ap);
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return (retval);
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}
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/*
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* Scaled down version of vsprintf(3).
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*/
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int
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vsprintf(char *buf, const char *cfmt, va_list ap)
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{
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int retval;
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retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
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buf[retval] = '\0';
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return (retval);
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}
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/*
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* Scaled down version of snprintf(3).
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*/
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int
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snprintf(char *str, size_t size, const char *format, ...)
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{
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int retval;
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va_list ap;
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va_start(ap, format);
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retval = vsnprintf(str, size, format, ap);
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va_end(ap);
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return(retval);
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}
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/*
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* Scaled down version of vsnprintf(3).
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*/
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int
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vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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struct snprintf_arg info;
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int retval;
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info.str = str;
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info.remain = size;
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retval = kvprintf(format, snprintf_func, &info, 10, ap);
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if (info.remain >= 1)
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*info.str++ = '\0';
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return (retval);
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}
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/*
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* Kernel version which takes radix argument vsnprintf(3).
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*/
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int
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vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
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{
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struct snprintf_arg info;
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int retval;
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info.str = str;
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info.remain = size;
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retval = kvprintf(format, snprintf_func, &info, radix, ap);
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if (info.remain >= 1)
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*info.str++ = '\0';
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return (retval);
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}
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static void
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snprintf_func(int ch, void *arg)
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{
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struct snprintf_arg *const info = arg;
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if (info->remain >= 2) {
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*info->str++ = ch;
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info->remain--;
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}
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}
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/*
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* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
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* order; return an optional length and a pointer to the last character
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* written in the buffer (i.e., the first character of the string).
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* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
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*/
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static char *
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ksprintn(char *nbuf, uintmax_t num, int base, int *lenp)
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{
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char *p;
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p = nbuf;
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*p = '\0';
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do {
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*++p = hex2ascii(num % base);
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} while (num /= base);
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if (lenp)
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*lenp = p - nbuf;
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return (p);
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}
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|
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/*
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* Scaled down version of printf(3).
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*
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* Two additional formats:
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*
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* The format %b is supported to decode error registers.
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* Its usage is:
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*
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* printf("reg=%b\n", regval, "<base><arg>*");
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*
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* where <base> is the output base expressed as a control character, e.g.
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* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
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* the first of which gives the bit number to be inspected (origin 1), and
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* the next characters (up to a control character, i.e. a character <= 32),
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* give the name of the register. Thus:
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*
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* kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
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*
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* would produce output:
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*
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* reg=3<BITTWO,BITONE>
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*
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* XXX: %D -- Hexdump, takes pointer and separator string:
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* ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
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* ("%*D", len, ptr, " " -> XX XX XX XX ...
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*/
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int
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kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
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{
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#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
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char nbuf[MAXNBUF];
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char *d;
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const char *p, *percent, *q;
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u_char *up;
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int ch, n;
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uintmax_t num;
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int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
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int cflag, hflag, jflag, tflag, zflag;
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int dwidth;
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char padc;
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int retval = 0;
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num = 0;
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if (!func)
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d = (char *) arg;
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else
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d = NULL;
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if (fmt == NULL)
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fmt = "(fmt null)\n";
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if (radix < 2 || radix > 36)
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radix = 10;
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for (;;) {
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padc = ' ';
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width = 0;
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while ((ch = (u_char)*fmt++) != '%') {
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if (ch == '\0')
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return (retval);
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PCHAR(ch);
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}
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percent = fmt - 1;
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qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
|
|
sign = 0; dot = 0; dwidth = 0;
|
|
cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
|
|
reswitch: switch (ch = (u_char)*fmt++) {
|
|
case '.':
|
|
dot = 1;
|
|
goto reswitch;
|
|
case '#':
|
|
sharpflag = 1;
|
|
goto reswitch;
|
|
case '+':
|
|
sign = 1;
|
|
goto reswitch;
|
|
case '-':
|
|
ladjust = 1;
|
|
goto reswitch;
|
|
case '%':
|
|
PCHAR(ch);
|
|
break;
|
|
case '*':
|
|
if (!dot) {
|
|
width = va_arg(ap, int);
|
|
if (width < 0) {
|
|
ladjust = !ladjust;
|
|
width = -width;
|
|
}
|
|
} else {
|
|
dwidth = va_arg(ap, int);
|
|
}
|
|
goto reswitch;
|
|
case '0':
|
|
if (!dot) {
|
|
padc = '0';
|
|
goto reswitch;
|
|
}
|
|
case '1': case '2': case '3': case '4':
|
|
case '5': case '6': case '7': case '8': case '9':
|
|
for (n = 0;; ++fmt) {
|
|
n = n * 10 + ch - '0';
|
|
ch = *fmt;
|
|
if (ch < '0' || ch > '9')
|
|
break;
|
|
}
|
|
if (dot)
|
|
dwidth = n;
|
|
else
|
|
width = n;
|
|
goto reswitch;
|
|
case 'b':
|
|
num = (u_int)va_arg(ap, int);
|
|
p = va_arg(ap, char *);
|
|
for (q = ksprintn(nbuf, num, *p++, NULL); *q;)
|
|
PCHAR(*q--);
|
|
|
|
if (num == 0)
|
|
break;
|
|
|
|
for (tmp = 0; *p;) {
|
|
n = *p++;
|
|
if (num & (1 << (n - 1))) {
|
|
PCHAR(tmp ? ',' : '<');
|
|
for (; (n = *p) > ' '; ++p)
|
|
PCHAR(n);
|
|
tmp = 1;
|
|
} else
|
|
for (; *p > ' '; ++p)
|
|
continue;
|
|
}
|
|
if (tmp)
|
|
PCHAR('>');
|
|
break;
|
|
case 'c':
|
|
PCHAR(va_arg(ap, int));
|
|
break;
|
|
case 'D':
|
|
up = va_arg(ap, u_char *);
|
|
p = va_arg(ap, char *);
|
|
if (!width)
|
|
width = 16;
|
|
while(width--) {
|
|
PCHAR(hex2ascii(*up >> 4));
|
|
PCHAR(hex2ascii(*up & 0x0f));
|
|
up++;
|
|
if (width)
|
|
for (q=p;*q;q++)
|
|
PCHAR(*q);
|
|
}
|
|
break;
|
|
case 'd':
|
|
case 'i':
|
|
base = 10;
|
|
sign = 1;
|
|
goto handle_sign;
|
|
case 'h':
|
|
if (hflag) {
|
|
hflag = 0;
|
|
cflag = 1;
|
|
} else
|
|
hflag = 1;
|
|
goto reswitch;
|
|
case 'j':
|
|
jflag = 1;
|
|
goto reswitch;
|
|
case 'l':
|
|
if (lflag) {
|
|
lflag = 0;
|
|
qflag = 1;
|
|
} else
|
|
lflag = 1;
|
|
goto reswitch;
|
|
case 'n':
|
|
if (jflag)
|
|
*(va_arg(ap, intmax_t *)) = retval;
|
|
else if (qflag)
|
|
*(va_arg(ap, quad_t *)) = retval;
|
|
else if (lflag)
|
|
*(va_arg(ap, long *)) = retval;
|
|
else if (zflag)
|
|
*(va_arg(ap, size_t *)) = retval;
|
|
else if (hflag)
|
|
*(va_arg(ap, short *)) = retval;
|
|
else if (cflag)
|
|
*(va_arg(ap, char *)) = retval;
|
|
else
|
|
*(va_arg(ap, int *)) = retval;
|
|
break;
|
|
case 'o':
|
|
base = 8;
|
|
goto handle_nosign;
|
|
case 'p':
|
|
base = 16;
|
|
sharpflag = (width == 0);
|
|
sign = 0;
|
|
num = (uintptr_t)va_arg(ap, void *);
|
|
goto number;
|
|
case 'q':
|
|
qflag = 1;
|
|
goto reswitch;
|
|
case 'r':
|
|
base = radix;
|
|
if (sign)
|
|
goto handle_sign;
|
|
goto handle_nosign;
|
|
case 's':
|
|
p = va_arg(ap, char *);
|
|
if (p == NULL)
|
|
p = "(null)";
|
|
if (!dot)
|
|
n = strlen (p);
|
|
else
|
|
for (n = 0; n < dwidth && p[n]; n++)
|
|
continue;
|
|
|
|
width -= n;
|
|
|
|
if (!ladjust && width > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
while (n--)
|
|
PCHAR(*p++);
|
|
if (ladjust && width > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
break;
|
|
case 't':
|
|
tflag = 1;
|
|
goto reswitch;
|
|
case 'u':
|
|
base = 10;
|
|
goto handle_nosign;
|
|
case 'x':
|
|
case 'X':
|
|
base = 16;
|
|
goto handle_nosign;
|
|
case 'y':
|
|
base = 16;
|
|
sign = 1;
|
|
goto handle_sign;
|
|
case 'z':
|
|
zflag = 1;
|
|
goto reswitch;
|
|
handle_nosign:
|
|
sign = 0;
|
|
if (jflag)
|
|
num = va_arg(ap, uintmax_t);
|
|
else if (qflag)
|
|
num = va_arg(ap, u_quad_t);
|
|
else if (tflag)
|
|
num = va_arg(ap, ptrdiff_t);
|
|
else if (lflag)
|
|
num = va_arg(ap, u_long);
|
|
else if (zflag)
|
|
num = va_arg(ap, size_t);
|
|
else if (hflag)
|
|
num = (u_short)va_arg(ap, int);
|
|
else if (cflag)
|
|
num = (u_char)va_arg(ap, int);
|
|
else
|
|
num = va_arg(ap, u_int);
|
|
goto number;
|
|
handle_sign:
|
|
if (jflag)
|
|
num = va_arg(ap, intmax_t);
|
|
else if (qflag)
|
|
num = va_arg(ap, quad_t);
|
|
else if (tflag)
|
|
num = va_arg(ap, ptrdiff_t);
|
|
else if (lflag)
|
|
num = va_arg(ap, long);
|
|
else if (zflag)
|
|
num = va_arg(ap, size_t);
|
|
else if (hflag)
|
|
num = (short)va_arg(ap, int);
|
|
else if (cflag)
|
|
num = (char)va_arg(ap, int);
|
|
else
|
|
num = va_arg(ap, int);
|
|
number:
|
|
if (sign && (intmax_t)num < 0) {
|
|
neg = 1;
|
|
num = -(intmax_t)num;
|
|
}
|
|
p = ksprintn(nbuf, num, base, &tmp);
|
|
if (sharpflag && num != 0) {
|
|
if (base == 8)
|
|
tmp++;
|
|
else if (base == 16)
|
|
tmp += 2;
|
|
}
|
|
if (neg)
|
|
tmp++;
|
|
|
|
if (!ladjust && width && (width -= tmp) > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
if (neg)
|
|
PCHAR('-');
|
|
if (sharpflag && num != 0) {
|
|
if (base == 8) {
|
|
PCHAR('0');
|
|
} else if (base == 16) {
|
|
PCHAR('0');
|
|
PCHAR('x');
|
|
}
|
|
}
|
|
|
|
while (*p)
|
|
PCHAR(*p--);
|
|
|
|
if (ladjust && width && (width -= tmp) > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
|
|
break;
|
|
default:
|
|
while (percent < fmt)
|
|
PCHAR(*percent++);
|
|
break;
|
|
}
|
|
}
|
|
#undef PCHAR
|
|
}
|
|
|
|
/*
|
|
* Put character in log buffer with a particular priority.
|
|
*/
|
|
static void
|
|
msglogchar(int c, int pri)
|
|
{
|
|
static int lastpri = -1;
|
|
static int dangling;
|
|
char nbuf[MAXNBUF];
|
|
char *p;
|
|
|
|
if (!msgbufmapped)
|
|
return;
|
|
if (c == '\0' || c == '\r')
|
|
return;
|
|
if (pri != -1 && pri != lastpri) {
|
|
if (dangling) {
|
|
msgbuf_addchar(msgbufp, '\n');
|
|
dangling = 0;
|
|
}
|
|
msgbuf_addchar(msgbufp, '<');
|
|
for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;)
|
|
msgbuf_addchar(msgbufp, *p--);
|
|
msgbuf_addchar(msgbufp, '>');
|
|
lastpri = pri;
|
|
}
|
|
msgbuf_addchar(msgbufp, c);
|
|
if (c == '\n') {
|
|
dangling = 0;
|
|
lastpri = -1;
|
|
} else {
|
|
dangling = 1;
|
|
}
|
|
}
|
|
|
|
void
|
|
msgbufinit(void *ptr, int size)
|
|
{
|
|
char *cp;
|
|
static struct msgbuf *oldp = NULL;
|
|
|
|
size -= sizeof(*msgbufp);
|
|
cp = (char *)ptr;
|
|
msgbufp = (struct msgbuf *)(cp + size);
|
|
msgbuf_reinit(msgbufp, cp, size);
|
|
if (msgbufmapped && oldp != msgbufp)
|
|
msgbuf_copy(oldp, msgbufp);
|
|
msgbufmapped = 1;
|
|
oldp = msgbufp;
|
|
}
|
|
|
|
SYSCTL_DECL(_security_bsd);
|
|
|
|
static int unprivileged_read_msgbuf = 1;
|
|
SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
|
|
CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
|
|
"Unprivileged processes may read the kernel message buffer");
|
|
|
|
/* Sysctls for accessing/clearing the msgbuf */
|
|
static int
|
|
sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[128];
|
|
u_int seq;
|
|
int error, len;
|
|
|
|
if (!unprivileged_read_msgbuf) {
|
|
error = suser(req->td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/* Read the whole buffer, one chunk at a time. */
|
|
msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
|
|
while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
|
|
error = sysctl_handle_opaque(oidp, buf, len, req);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
|
|
0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
|
|
|
|
static int msgbuf_clearflag;
|
|
|
|
static int
|
|
sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
|
|
if (!error && req->newptr) {
|
|
msgbuf_clear(msgbufp);
|
|
msgbuf_clearflag = 0;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
|
|
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
|
|
sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
|
|
|
|
#ifdef DDB
|
|
|
|
DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
|
|
{
|
|
int i, j;
|
|
|
|
if (!msgbufmapped) {
|
|
db_printf("msgbuf not mapped yet\n");
|
|
return;
|
|
}
|
|
db_printf("msgbufp = %p\n", msgbufp);
|
|
db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
|
|
msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
|
|
msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
|
|
for (i = 0; i < msgbufp->msg_size; i++) {
|
|
j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
|
|
db_printf("%c", msgbufp->msg_ptr[j]);
|
|
}
|
|
db_printf("\n");
|
|
}
|
|
|
|
#endif /* DDB */
|
|
|
|
void
|
|
hexdump(void *ptr, int length, const char *hdr, int flags)
|
|
{
|
|
int i, j, k;
|
|
int cols;
|
|
unsigned char *cp;
|
|
char delim;
|
|
|
|
if ((flags & HD_DELIM_MASK) != 0)
|
|
delim = (flags & HD_DELIM_MASK) >> 8;
|
|
else
|
|
delim = ' ';
|
|
|
|
if ((flags & HD_COLUMN_MASK) != 0)
|
|
cols = flags & HD_COLUMN_MASK;
|
|
else
|
|
cols = 16;
|
|
|
|
cp = ptr;
|
|
for (i = 0; i < length; i+= cols) {
|
|
if (hdr != NULL)
|
|
printf("%s", hdr);
|
|
|
|
if ((flags & HD_OMIT_COUNT) == 0)
|
|
printf("%04x ", i);
|
|
|
|
if ((flags & HD_OMIT_HEX) == 0) {
|
|
for (j = 0; j < cols; j++) {
|
|
k = i + j;
|
|
if (k < length)
|
|
printf("%c%02x", delim, cp[k]);
|
|
else
|
|
printf(" ");
|
|
}
|
|
}
|
|
|
|
if ((flags & HD_OMIT_CHARS) == 0) {
|
|
printf(" |");
|
|
for (j = 0; j < cols; j++) {
|
|
k = i + j;
|
|
if (k >= length)
|
|
printf(" ");
|
|
else if (cp[k] >= ' ' && cp[k] <= '~')
|
|
printf("%c", cp[k]);
|
|
else
|
|
printf(".");
|
|
}
|
|
printf("|\n");
|
|
}
|
|
}
|
|
}
|
|
|