[apple/xnu.git] / bsd / kern / subr_log.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)subr_log.c	8.3 (Berkeley) 2/14/95
 */

/*
 * Error log buffer for kernel printf's.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/vnode.h>
#include <sys/ioctl.h>
#include <sys/msgbuf.h>
#include <sys/file_internal.h>
#include <sys/errno.h>
#include <sys/select.h>
#include <sys/kernel.h>
#include <kern/thread.h>
#include <sys/lock.h>

#define LOG_RDPRI	(PZERO + 1)

#define LOG_NBIO	0x02
#define LOG_ASYNC	0x04
#define LOG_RDWAIT	0x08

struct logsoftc {
	int	sc_state;		/* see above for possibilities */
	struct	selinfo sc_selp;	/* thread waiting for select */
	int	sc_pgid;		/* process/group for async I/O */
} logsoftc;

int	log_open;			/* also used in log() */
struct msgbuf temp_msgbuf;
struct msgbuf *msgbufp;
static int _logentrypend = 0;
static int log_inited = 0;
void bsd_log_lock(void);
/* the following two are implemented in osfmk/kern/printf.c  */
extern void bsd_log_unlock(void);
extern void bsd_log_init(void);

/*
 * Serialize log access.  Note that the log can be written at interrupt level,
 * so any log manipulations that can be done from, or affect, another processor
 * at interrupt level must be guarded with a spin lock.
 */

#define	LOG_LOCK() bsd_log_lock()
#define	LOG_UNLOCK() bsd_log_unlock()


/*ARGSUSED*/
logopen(dev, flags, mode, p)
	dev_t dev;
	int flags, mode;
	struct proc *p;
{
	LOG_LOCK();
	if (log_open) {
		LOG_UNLOCK();
		return (EBUSY);
	}
	log_open = 1;
	logsoftc.sc_pgid = p->p_pid;		/* signal process only */
	/*
	 * Potential race here with putchar() but since putchar should be
	 * called by autoconf, msg_magic should be initialized by the time
	 * we get here.
	 */
	if (msgbufp->msg_magic != MSG_MAGIC) {
		register int i;

		msgbufp->msg_magic = MSG_MAGIC;
		msgbufp->msg_bufx = msgbufp->msg_bufr = 0;
		for (i=0; i < MSG_BSIZE; i++)
			msgbufp->msg_bufc[i] = 0;
	}
	LOG_UNLOCK();

	return (0);
}

/*ARGSUSED*/
int
logclose(dev, flag)
	dev_t dev;
{
	int oldpri;
	LOG_LOCK();
	log_open = 0;
	selwakeup(&logsoftc.sc_selp);
	selthreadclear(&logsoftc.sc_selp);
	LOG_UNLOCK();
	return (0);
}

/*ARGSUSED*/
int
logread(dev, uio, flag)
	dev_t dev;
	struct uio *uio;
	int flag;
{
	register long l;
	register int s;
	int error = 0;
	char localbuff[MSG_BSIZE];
	int copybytes;

	LOG_LOCK();
	while (msgbufp->msg_bufr == msgbufp->msg_bufx) {
		if (flag & IO_NDELAY) {
			error = EWOULDBLOCK;
			goto out;
		}
		if (logsoftc.sc_state & LOG_NBIO) {
			error = EWOULDBLOCK;
			goto out;
		}
		logsoftc.sc_state |= LOG_RDWAIT;
		LOG_UNLOCK();
		/*
		 * If the wakeup is missed the ligtening bolt will wake this up 
		 * if there are any new characters. If that doesn't do it
		 * then wait for 5 sec and reevaluate 
		 */
		if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI | PCATCH,
				"klog", 5 * hz)) {
			/* if it times out; ignore */
			if (error != EWOULDBLOCK)
				return (error);
		}
		LOG_LOCK();
	}
	logsoftc.sc_state &= ~LOG_RDWAIT;


	while (uio_resid(uio) > 0) {
		l = msgbufp->msg_bufx - msgbufp->msg_bufr;
		if (l < 0)
			l = MSG_BSIZE - msgbufp->msg_bufr;
		l = min(l, uio_resid(uio));
		if (l == 0)
			break;
		bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l);
		LOG_UNLOCK();
		error = uiomove((caddr_t)&localbuff[0],
			(int)l, uio);
		LOG_LOCK();
		if (error)
			break;
		msgbufp->msg_bufr += l;
		if (msgbufp->msg_bufr < 0 || msgbufp->msg_bufr >= MSG_BSIZE)
			msgbufp->msg_bufr = 0;
	}
out:
	LOG_UNLOCK();
	return (error);
}

/*ARGSUSED*/
int
logselect(dev, rw, wql, p)
	dev_t dev;
	int rw;
	void * wql;
	struct proc *p;
{

	switch (rw) {

	case FREAD:
		LOG_LOCK();	
		if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
			LOG_UNLOCK();
			return (1);
		}
		selrecord(p, &logsoftc.sc_selp, wql);
		LOG_UNLOCK();
		break;
	}
	return (0);
}

void
logwakeup()
{
	struct proc *p;
	int pgid;
	boolean_t funnel_state;

	LOG_LOCK();	
	if (!log_open) {
		LOG_UNLOCK();
		return;
	}
	selwakeup(&logsoftc.sc_selp);
	if (logsoftc.sc_state & LOG_ASYNC) {
		pgid = logsoftc.sc_pgid;
		LOG_UNLOCK();
		if (pgid < 0)
			gsignal(-pgid, SIGIO); 
		else if (p = pfind(pgid))
			psignal(p, SIGIO);
		LOG_LOCK();
	}
	if (logsoftc.sc_state & LOG_RDWAIT) {
		wakeup((caddr_t)msgbufp);
		logsoftc.sc_state &= ~LOG_RDWAIT;
	}
	LOG_UNLOCK();
}

void
klogwakeup()
{

	if (_logentrypend) {
		_logentrypend = 0;
		logwakeup();
	}
}

/*ARGSUSED*/
int
logioctl(dev, com, data, flag)
	caddr_t data;
{
	long l;
	int s;

	LOG_LOCK();	
	switch (com) {

	/* return number of characters immediately available */
	case FIONREAD:
		l = msgbufp->msg_bufx - msgbufp->msg_bufr;
		if (l < 0)
			l += MSG_BSIZE;
		*(off_t *)data = l;
		break;

	case FIONBIO:
		if (*(int *)data)
			logsoftc.sc_state |= LOG_NBIO;
		else
			logsoftc.sc_state &= ~LOG_NBIO;
		break;

	case FIOASYNC:
		if (*(int *)data)
			logsoftc.sc_state |= LOG_ASYNC;
		else
			logsoftc.sc_state &= ~LOG_ASYNC;
		break;

	case TIOCSPGRP:
		logsoftc.sc_pgid = *(int *)data;
		break;

	case TIOCGPGRP:
		*(int *)data = logsoftc.sc_pgid;
		break;

	default:
		LOG_UNLOCK();
		return (-1);
	}
	LOG_UNLOCK();
	return (0);
}

void
bsd_log_init()
{
	if (!log_inited) { 
		msgbufp = &temp_msgbuf;
		log_inited = 1;
	}
}

void
log_putc(char c)
{
	register struct msgbuf *mbp;

	if (!log_inited) {
		panic("bsd log is not inited");
	}
	LOG_LOCK();

	mbp = msgbufp; 
	if (mbp-> msg_magic != MSG_MAGIC) { 
		register int i;

		mbp->msg_magic = MSG_MAGIC;
		mbp->msg_bufx = mbp->msg_bufr = 0;
		for (i=0; i < MSG_BSIZE; i++)
			mbp->msg_bufc[i] = 0;
	}
	mbp->msg_bufc[mbp->msg_bufx++] = c;
	_logentrypend = 1;
	if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE)
		mbp->msg_bufx = 0;
	LOG_UNLOCK();
}
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
ff6e181a A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
1c79356b	12	*
ff6e181a A	13	* The Original Code and all software distributed under the License are
ff6e181a A	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
ff6e181a A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
1c79356b A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	24	/*
	25	* Copyright (c) 1982, 1986, 1993
	26	* The Regents of the University of California. All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*
	56	* @(#)subr_log.c 8.3 (Berkeley) 2/14/95
	57	*/
	58
	59	/*
	60	* Error log buffer for kernel printf's.
	61	*/
	62
	63	#include <sys/param.h>
	64	#include <sys/systm.h>
91447636	65	#include <sys/proc_internal.h>
1c79356b A	66	#include <sys/vnode.h>
	67	#include <sys/ioctl.h>
	68	#include <sys/msgbuf.h>
91447636	69	#include <sys/file_internal.h>
1c79356b A	70	#include <sys/errno.h>
1c79356b A	71	#include <sys/select.h>
91447636	72	#include <sys/kernel.h>
1c79356b	73	#include <kern/thread.h>
91447636	74	#include <sys/lock.h>
1c79356b A	75
	76	#define LOG_RDPRI (PZERO + 1)
	77
	78	#define LOG_NBIO 0x02
	79	#define LOG_ASYNC 0x04
	80	#define LOG_RDWAIT 0x08
	81
	82	struct logsoftc {
	83	int sc_state; /* see above for possibilities */
	84	struct selinfo sc_selp; /* thread waiting for select */
	85	int sc_pgid; /* process/group for async I/O */
	86	} logsoftc;
	87
	88	int log_open; /* also used in log() */
	89	struct msgbuf temp_msgbuf;
	90	struct msgbuf *msgbufp;
	91	static int _logentrypend = 0;
91447636 A	92	static int log_inited = 0;
	93	void bsd_log_lock(void);
	94	/* the following two are implemented in osfmk/kern/printf.c */
	95	extern void bsd_log_unlock(void);
	96	extern void bsd_log_init(void);
1c79356b A	97
	98	/*
	99	* Serialize log access. Note that the log can be written at interrupt level,
	100	* so any log manipulations that can be done from, or affect, another processor
	101	* at interrupt level must be guarded with a spin lock.
	102	*/
91447636 A	103
	104	#define LOG_LOCK() bsd_log_lock()
	105	#define LOG_UNLOCK() bsd_log_unlock()
	106
1c79356b A	107
	108	/ARGSUSED/
	109	logopen(dev, flags, mode, p)
	110	dev_t dev;
	111	int flags, mode;
	112	struct proc *p;
	113	{
1c79356b A	114	LOG_LOCK();
	115	if (log_open) {
	116	LOG_UNLOCK();
1c79356b A	117	return (EBUSY);
	118	}
	119	log_open = 1;
	120	logsoftc.sc_pgid = p->p_pid; /* signal process only */
	121	/*
	122	* Potential race here with putchar() but since putchar should be
	123	* called by autoconf, msg_magic should be initialized by the time
	124	* we get here.
	125	*/
	126	if (msgbufp->msg_magic != MSG_MAGIC) {
	127	register int i;
	128
	129	msgbufp->msg_magic = MSG_MAGIC;
	130	msgbufp->msg_bufx = msgbufp->msg_bufr = 0;
	131	for (i=0; i < MSG_BSIZE; i++)
	132	msgbufp->msg_bufc[i] = 0;
	133	}
	134	LOG_UNLOCK();
9bccf70c	135
1c79356b A	136	return (0);
	137	}
	138
	139	/ARGSUSED/
	140	int
	141	logclose(dev, flag)
	142	dev_t dev;
	143	{
	144	int oldpri;
	145	LOG_LOCK();
	146	log_open = 0;
	147	selwakeup(&logsoftc.sc_selp);
1c79356b	148	selthreadclear(&logsoftc.sc_selp);
1c79356b A	149	LOG_UNLOCK();
	150	return (0);
	151	}
	152
	153	/ARGSUSED/
	154	int
	155	logread(dev, uio, flag)
	156	dev_t dev;
	157	struct uio *uio;
	158	int flag;
	159	{
	160	register long l;
	161	register int s;
	162	int error = 0;
91447636 A	163	char localbuff[MSG_BSIZE];
91447636 A	164	int copybytes;
1c79356b	165
91447636	166	LOG_LOCK();
1c79356b A	167	while (msgbufp->msg_bufr == msgbufp->msg_bufx) {
1c79356b A	168	if (flag & IO_NDELAY) {
91447636 A	169	error = EWOULDBLOCK;
91447636 A	170	goto out;
1c79356b A	171	}
1c79356b A	172	if (logsoftc.sc_state & LOG_NBIO) {
91447636 A	173	error = EWOULDBLOCK;
91447636 A	174	goto out;
1c79356b A	175	}
1c79356b A	176	logsoftc.sc_state \|= LOG_RDWAIT;
91447636 A	177	LOG_UNLOCK();
	178	/*
	179	* If the wakeup is missed the ligtening bolt will wake this up
	180	* if there are any new characters. If that doesn't do it
	181	* then wait for 5 sec and reevaluate
	182	*/
1c79356b	183	if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI \| PCATCH,
91447636 A	184	"klog", 5 * hz)) {
	185	/* if it times out; ignore */
	186	if (error != EWOULDBLOCK)
	187	return (error);
1c79356b	188	}
91447636	189	LOG_LOCK();
1c79356b	190	}
1c79356b A	191	logsoftc.sc_state &= ~LOG_RDWAIT;
1c79356b A	192
91447636 A	193
91447636 A	194	while (uio_resid(uio) > 0) {
1c79356b A	195	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
	196	if (l < 0)
	197	l = MSG_BSIZE - msgbufp->msg_bufr;
91447636	198	l = min(l, uio_resid(uio));
1c79356b A	199	if (l == 0)
1c79356b A	200	break;
91447636 A	201	bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l);
	202	LOG_UNLOCK();
	203	error = uiomove((caddr_t)&localbuff[0],
1c79356b	204	(int)l, uio);
91447636	205	LOG_LOCK();
1c79356b A	206	if (error)
	207	break;
	208	msgbufp->msg_bufr += l;
	209	if (msgbufp->msg_bufr < 0 \|\| msgbufp->msg_bufr >= MSG_BSIZE)
	210	msgbufp->msg_bufr = 0;
	211	}
91447636 A	212	out:
91447636 A	213	LOG_UNLOCK();
1c79356b A	214	return (error);
	215	}
	216
	217	/ARGSUSED/
	218	int
0b4e3aa0	219	logselect(dev, rw, wql, p)
1c79356b A	220	dev_t dev;
1c79356b A	221	int rw;
0b4e3aa0	222	void * wql;
1c79356b A	223	struct proc *p;
1c79356b A	224	{
1c79356b A	225
	226	switch (rw) {
	227
	228	case FREAD:
91447636	229	LOG_LOCK();
1c79356b	230	if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
91447636	231	LOG_UNLOCK();
1c79356b A	232	return (1);
1c79356b A	233	}
0b4e3aa0	234	selrecord(p, &logsoftc.sc_selp, wql);
91447636	235	LOG_UNLOCK();
1c79356b A	236	break;
1c79356b A	237	}
1c79356b A	238	return (0);
	239	}
	240
	241	void
	242	logwakeup()
	243	{
	244	struct proc *p;
	245	int pgid;
	246	boolean_t funnel_state;
	247
91447636 A	248	LOG_LOCK();
	249	if (!log_open) {
	250	LOG_UNLOCK();
1c79356b	251	return;
91447636	252	}
1c79356b A	253	selwakeup(&logsoftc.sc_selp);
1c79356b A	254	if (logsoftc.sc_state & LOG_ASYNC) {
1c79356b A	255	pgid = logsoftc.sc_pgid;
	256	LOG_UNLOCK();
	257	if (pgid < 0)
	258	gsignal(-pgid, SIGIO);
	259	else if (p = pfind(pgid))
	260	psignal(p, SIGIO);
91447636	261	LOG_LOCK();
1c79356b A	262	}
	263	if (logsoftc.sc_state & LOG_RDWAIT) {
	264	wakeup((caddr_t)msgbufp);
	265	logsoftc.sc_state &= ~LOG_RDWAIT;
	266	}
91447636	267	LOG_UNLOCK();
1c79356b A	268	}
	269
	270	void
	271	klogwakeup()
	272	{
	273
	274	if (_logentrypend) {
	275	_logentrypend = 0;
	276	logwakeup();
	277	}
	278	}
	279
	280	/ARGSUSED/
	281	int
55e303ae	282	logioctl(dev, com, data, flag)
1c79356b A	283	caddr_t data;
	284	{
	285	long l;
	286	int s;
	287
91447636	288	LOG_LOCK();
1c79356b A	289	switch (com) {
	290
	291	/* return number of characters immediately available */
	292	case FIONREAD:
1c79356b	293	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
1c79356b A	294	if (l < 0)
	295	l += MSG_BSIZE;
	296	(off_t )data = l;
	297	break;
	298
	299	case FIONBIO:
	300	if ((int )data)
	301	logsoftc.sc_state \|= LOG_NBIO;
	302	else
	303	logsoftc.sc_state &= ~LOG_NBIO;
	304	break;
	305
	306	case FIOASYNC:
	307	if ((int )data)
	308	logsoftc.sc_state \|= LOG_ASYNC;
	309	else
	310	logsoftc.sc_state &= ~LOG_ASYNC;
	311	break;
	312
	313	case TIOCSPGRP:
1c79356b	314	logsoftc.sc_pgid = (int )data;
1c79356b A	315	break;
	316
	317	case TIOCGPGRP:
1c79356b	318	(int )data = logsoftc.sc_pgid;
1c79356b A	319	break;
	320
	321	default:
91447636	322	LOG_UNLOCK();
1c79356b A	323	return (-1);
1c79356b A	324	}
91447636	325	LOG_UNLOCK();
1c79356b A	326	return (0);
	327	}
	328
	329	void
91447636	330	bsd_log_init()
1c79356b	331	{
91447636 A	332	if (!log_inited) {
	333	msgbufp = &temp_msgbuf;
	334	log_inited = 1;
	335	}
1c79356b A	336	}
	337
	338	void
	339	log_putc(char c)
	340	{
	341	register struct msgbuf *mbp;
	342
91447636 A	343	if (!log_inited) {
	344	panic("bsd log is not inited");
	345	}
	346	LOG_LOCK();
1c79356b A	347
	348	mbp = msgbufp;
	349	if (mbp-> msg_magic != MSG_MAGIC) {
	350	register int i;
	351
	352	mbp->msg_magic = MSG_MAGIC;
	353	mbp->msg_bufx = mbp->msg_bufr = 0;
	354	for (i=0; i < MSG_BSIZE; i++)
	355	mbp->msg_bufc[i] = 0;
	356	}
	357	mbp->msg_bufc[mbp->msg_bufx++] = c;
	358	_logentrypend = 1;
	359	if (mbp->msg_bufx < 0 \|\| mbp->msg_bufx >= MSG_BSIZE)
	360	mbp->msg_bufx = 0;
91447636	361	LOG_UNLOCK();
1c79356b	362	}
91447636	363