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

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * 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_OSREFERENCE_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	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8ad349bb	4	* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
1c79356b	5	*
8ad349bb 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. The rights granted to you under the
	10	* License may not be used to create, or enable the creation or
	11	* redistribution of, unlawful or unlicensed copies of an Apple operating
	12	* system, or to circumvent, violate, or enable the circumvention or
	13	* violation of, any terms of an Apple operating system software license
	14	* agreement.
	15	*
	16	* Please obtain a copy of the License at
	17	* http://www.opensource.apple.com/apsl/ and read it before using this
	18	* file.
	19	*
	20	* The Original Code and all software distributed under the License are
	21	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	22	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	23	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	25	* Please see the License for the specific language governing rights and
	26	* limitations under the License.
	27	*
	28	* @APPLE_LICENSE_OSREFERENCE_HEADER_END@
1c79356b A	29	*/
	30	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	31	/*
	32	* Copyright (c) 1982, 1986, 1993
	33	* The Regents of the University of California. All rights reserved.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. All advertising materials mentioning features or use of this software
	44	* must display the following acknowledgement:
	45	* This product includes software developed by the University of
	46	* California, Berkeley and its contributors.
	47	* 4. Neither the name of the University nor the names of its contributors
	48	* may be used to endorse or promote products derived from this software
	49	* without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	52	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	53	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	54	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	55	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	56	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	57	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	58	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	59	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	60	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	61	* SUCH DAMAGE.
	62	*
	63	* @(#)subr_log.c 8.3 (Berkeley) 2/14/95
	64	*/
	65
	66	/*
	67	* Error log buffer for kernel printf's.
	68	*/
	69
	70	#include <sys/param.h>
	71	#include <sys/systm.h>
91447636	72	#include <sys/proc_internal.h>
1c79356b A	73	#include <sys/vnode.h>
	74	#include <sys/ioctl.h>
	75	#include <sys/msgbuf.h>
91447636	76	#include <sys/file_internal.h>
1c79356b A	77	#include <sys/errno.h>
1c79356b A	78	#include <sys/select.h>
91447636	79	#include <sys/kernel.h>
1c79356b	80	#include <kern/thread.h>
91447636	81	#include <sys/lock.h>
1c79356b A	82
	83	#define LOG_RDPRI (PZERO + 1)
	84
	85	#define LOG_NBIO 0x02
	86	#define LOG_ASYNC 0x04
	87	#define LOG_RDWAIT 0x08
	88
	89	struct logsoftc {
	90	int sc_state; /* see above for possibilities */
	91	struct selinfo sc_selp; /* thread waiting for select */
	92	int sc_pgid; /* process/group for async I/O */
	93	} logsoftc;
	94
	95	int log_open; /* also used in log() */
	96	struct msgbuf temp_msgbuf;
	97	struct msgbuf *msgbufp;
	98	static int _logentrypend = 0;
91447636 A	99	static int log_inited = 0;
	100	void bsd_log_lock(void);
	101	/* the following two are implemented in osfmk/kern/printf.c */
	102	extern void bsd_log_unlock(void);
	103	extern void bsd_log_init(void);
1c79356b A	104
	105	/*
	106	* Serialize log access. Note that the log can be written at interrupt level,
	107	* so any log manipulations that can be done from, or affect, another processor
	108	* at interrupt level must be guarded with a spin lock.
	109	*/
91447636 A	110
	111	#define LOG_LOCK() bsd_log_lock()
	112	#define LOG_UNLOCK() bsd_log_unlock()
	113
1c79356b A	114
	115	/ARGSUSED/
	116	logopen(dev, flags, mode, p)
	117	dev_t dev;
	118	int flags, mode;
	119	struct proc *p;
	120	{
1c79356b A	121	LOG_LOCK();
	122	if (log_open) {
	123	LOG_UNLOCK();
1c79356b A	124	return (EBUSY);
	125	}
	126	log_open = 1;
	127	logsoftc.sc_pgid = p->p_pid; /* signal process only */
	128	/*
	129	* Potential race here with putchar() but since putchar should be
	130	* called by autoconf, msg_magic should be initialized by the time
	131	* we get here.
	132	*/
	133	if (msgbufp->msg_magic != MSG_MAGIC) {
	134	register int i;
	135
	136	msgbufp->msg_magic = MSG_MAGIC;
	137	msgbufp->msg_bufx = msgbufp->msg_bufr = 0;
	138	for (i=0; i < MSG_BSIZE; i++)
	139	msgbufp->msg_bufc[i] = 0;
	140	}
	141	LOG_UNLOCK();
9bccf70c	142
1c79356b A	143	return (0);
	144	}
	145
	146	/ARGSUSED/
	147	int
	148	logclose(dev, flag)
	149	dev_t dev;
	150	{
	151	int oldpri;
	152	LOG_LOCK();
	153	log_open = 0;
	154	selwakeup(&logsoftc.sc_selp);
1c79356b	155	selthreadclear(&logsoftc.sc_selp);
1c79356b A	156	LOG_UNLOCK();
	157	return (0);
	158	}
	159
	160	/ARGSUSED/
	161	int
	162	logread(dev, uio, flag)
	163	dev_t dev;
	164	struct uio *uio;
	165	int flag;
	166	{
	167	register long l;
	168	register int s;
	169	int error = 0;
91447636 A	170	char localbuff[MSG_BSIZE];
91447636 A	171	int copybytes;
1c79356b	172
91447636	173	LOG_LOCK();
1c79356b A	174	while (msgbufp->msg_bufr == msgbufp->msg_bufx) {
1c79356b A	175	if (flag & IO_NDELAY) {
91447636 A	176	error = EWOULDBLOCK;
91447636 A	177	goto out;
1c79356b A	178	}
1c79356b A	179	if (logsoftc.sc_state & LOG_NBIO) {
91447636 A	180	error = EWOULDBLOCK;
91447636 A	181	goto out;
1c79356b A	182	}
1c79356b A	183	logsoftc.sc_state \|= LOG_RDWAIT;
91447636 A	184	LOG_UNLOCK();
	185	/*
	186	* If the wakeup is missed the ligtening bolt will wake this up
	187	* if there are any new characters. If that doesn't do it
	188	* then wait for 5 sec and reevaluate
	189	*/
1c79356b	190	if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI \| PCATCH,
91447636 A	191	"klog", 5 * hz)) {
	192	/* if it times out; ignore */
	193	if (error != EWOULDBLOCK)
	194	return (error);
1c79356b	195	}
91447636	196	LOG_LOCK();
1c79356b	197	}
1c79356b A	198	logsoftc.sc_state &= ~LOG_RDWAIT;
1c79356b A	199
91447636 A	200
91447636 A	201	while (uio_resid(uio) > 0) {
1c79356b A	202	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
	203	if (l < 0)
	204	l = MSG_BSIZE - msgbufp->msg_bufr;
91447636	205	l = min(l, uio_resid(uio));
1c79356b A	206	if (l == 0)
1c79356b A	207	break;
91447636 A	208	bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l);
	209	LOG_UNLOCK();
	210	error = uiomove((caddr_t)&localbuff[0],
1c79356b	211	(int)l, uio);
91447636	212	LOG_LOCK();
1c79356b A	213	if (error)
	214	break;
	215	msgbufp->msg_bufr += l;
	216	if (msgbufp->msg_bufr < 0 \|\| msgbufp->msg_bufr >= MSG_BSIZE)
	217	msgbufp->msg_bufr = 0;
	218	}
91447636 A	219	out:
91447636 A	220	LOG_UNLOCK();
1c79356b A	221	return (error);
	222	}
	223
	224	/ARGSUSED/
	225	int
0b4e3aa0	226	logselect(dev, rw, wql, p)
1c79356b A	227	dev_t dev;
1c79356b A	228	int rw;
0b4e3aa0	229	void * wql;
1c79356b A	230	struct proc *p;
1c79356b A	231	{
1c79356b A	232
	233	switch (rw) {
	234
	235	case FREAD:
91447636	236	LOG_LOCK();
1c79356b	237	if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
91447636	238	LOG_UNLOCK();
1c79356b A	239	return (1);
1c79356b A	240	}
0b4e3aa0	241	selrecord(p, &logsoftc.sc_selp, wql);
91447636	242	LOG_UNLOCK();
1c79356b A	243	break;
1c79356b A	244	}
1c79356b A	245	return (0);
	246	}
	247
	248	void
	249	logwakeup()
	250	{
	251	struct proc *p;
	252	int pgid;
	253	boolean_t funnel_state;
	254
91447636 A	255	LOG_LOCK();
	256	if (!log_open) {
	257	LOG_UNLOCK();
1c79356b	258	return;
91447636	259	}
1c79356b A	260	selwakeup(&logsoftc.sc_selp);
1c79356b A	261	if (logsoftc.sc_state & LOG_ASYNC) {
1c79356b A	262	pgid = logsoftc.sc_pgid;
	263	LOG_UNLOCK();
	264	if (pgid < 0)
	265	gsignal(-pgid, SIGIO);
	266	else if (p = pfind(pgid))
	267	psignal(p, SIGIO);
91447636	268	LOG_LOCK();
1c79356b A	269	}
	270	if (logsoftc.sc_state & LOG_RDWAIT) {
	271	wakeup((caddr_t)msgbufp);
	272	logsoftc.sc_state &= ~LOG_RDWAIT;
	273	}
91447636	274	LOG_UNLOCK();
1c79356b A	275	}
	276
	277	void
	278	klogwakeup()
	279	{
	280
	281	if (_logentrypend) {
	282	_logentrypend = 0;
	283	logwakeup();
	284	}
	285	}
	286
	287	/ARGSUSED/
	288	int
55e303ae	289	logioctl(dev, com, data, flag)
1c79356b A	290	caddr_t data;
	291	{
	292	long l;
	293	int s;
	294
91447636	295	LOG_LOCK();
1c79356b A	296	switch (com) {
	297
	298	/* return number of characters immediately available */
	299	case FIONREAD:
1c79356b	300	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
1c79356b A	301	if (l < 0)
	302	l += MSG_BSIZE;
	303	(off_t )data = l;
	304	break;
	305
	306	case FIONBIO:
	307	if ((int )data)
	308	logsoftc.sc_state \|= LOG_NBIO;
	309	else
	310	logsoftc.sc_state &= ~LOG_NBIO;
	311	break;
	312
	313	case FIOASYNC:
	314	if ((int )data)
	315	logsoftc.sc_state \|= LOG_ASYNC;
	316	else
	317	logsoftc.sc_state &= ~LOG_ASYNC;
	318	break;
	319
	320	case TIOCSPGRP:
1c79356b	321	logsoftc.sc_pgid = (int )data;
1c79356b A	322	break;
	323
	324	case TIOCGPGRP:
1c79356b	325	(int )data = logsoftc.sc_pgid;
1c79356b A	326	break;
	327
	328	default:
91447636	329	LOG_UNLOCK();
1c79356b A	330	return (-1);
1c79356b A	331	}
91447636	332	LOG_UNLOCK();
1c79356b A	333	return (0);
	334	}
	335
	336	void
91447636	337	bsd_log_init()
1c79356b	338	{
91447636 A	339	if (!log_inited) {
	340	msgbufp = &temp_msgbuf;
	341	log_inited = 1;
	342	}
1c79356b A	343	}
	344
	345	void
	346	log_putc(char c)
	347	{
	348	register struct msgbuf *mbp;
	349
91447636 A	350	if (!log_inited) {
	351	panic("bsd log is not inited");
	352	}
	353	LOG_LOCK();
1c79356b A	354
	355	mbp = msgbufp;
	356	if (mbp-> msg_magic != MSG_MAGIC) {
	357	register int i;
	358
	359	mbp->msg_magic = MSG_MAGIC;
	360	mbp->msg_bufx = mbp->msg_bufr = 0;
	361	for (i=0; i < MSG_BSIZE; i++)
	362	mbp->msg_bufc[i] = 0;
	363	}
	364	mbp->msg_bufc[mbp->msg_bufx++] = c;
	365	_logentrypend = 1;
	366	if (mbp->msg_bufx < 0 \|\| mbp->msg_bufx >= MSG_BSIZE)
	367	mbp->msg_bufx = 0;
91447636	368	LOG_UNLOCK();
1c79356b	369	}
91447636	370