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

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_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. 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_OSREFERENCE_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	/*
5d5c5d0d A	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 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 License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
	29	/*
	30	* Copyright (c) 1982, 1986, 1993
	31	* The Regents of the University of California. All rights reserved.
	32	*
	33	* Redistribution and use in source and binary forms, with or without
	34	* modification, are permitted provided that the following conditions
	35	* are met:
	36	* 1. Redistributions of source code must retain the above copyright
	37	* notice, this list of conditions and the following disclaimer.
	38	* 2. Redistributions in binary form must reproduce the above copyright
	39	* notice, this list of conditions and the following disclaimer in the
	40	* documentation and/or other materials provided with the distribution.
	41	* 3. All advertising materials mentioning features or use of this software
	42	* must display the following acknowledgement:
	43	* This product includes software developed by the University of
	44	* California, Berkeley and its contributors.
	45	* 4. Neither the name of the University nor the names of its contributors
	46	* may be used to endorse or promote products derived from this software
	47	* without specific prior written permission.
	48	*
	49	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	50	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	51	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	52	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	53	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	54	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	55	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	56	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	57	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	58	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	59	* SUCH DAMAGE.
	60	*
	61	* @(#)subr_log.c 8.3 (Berkeley) 2/14/95
	62	*/
	63
	64	/*
	65	* Error log buffer for kernel printf's.
	66	*/
	67
	68	#include <sys/param.h>
	69	#include <sys/systm.h>
91447636	70	#include <sys/proc_internal.h>
1c79356b A	71	#include <sys/vnode.h>
	72	#include <sys/ioctl.h>
	73	#include <sys/msgbuf.h>
91447636	74	#include <sys/file_internal.h>
1c79356b A	75	#include <sys/errno.h>
1c79356b A	76	#include <sys/select.h>
91447636	77	#include <sys/kernel.h>
1c79356b	78	#include <kern/thread.h>
91447636	79	#include <sys/lock.h>
1c79356b A	80
	81	#define LOG_RDPRI (PZERO + 1)
	82
	83	#define LOG_NBIO 0x02
	84	#define LOG_ASYNC 0x04
	85	#define LOG_RDWAIT 0x08
	86
	87	struct logsoftc {
	88	int sc_state; /* see above for possibilities */
	89	struct selinfo sc_selp; /* thread waiting for select */
	90	int sc_pgid; /* process/group for async I/O */
	91	} logsoftc;
	92
	93	int log_open; /* also used in log() */
	94	struct msgbuf temp_msgbuf;
	95	struct msgbuf *msgbufp;
	96	static int _logentrypend = 0;
91447636 A	97	static int log_inited = 0;
	98	void bsd_log_lock(void);
	99	/* the following two are implemented in osfmk/kern/printf.c */
	100	extern void bsd_log_unlock(void);
	101	extern void bsd_log_init(void);
1c79356b A	102
	103	/*
	104	* Serialize log access. Note that the log can be written at interrupt level,
	105	* so any log manipulations that can be done from, or affect, another processor
	106	* at interrupt level must be guarded with a spin lock.
	107	*/
91447636 A	108
	109	#define LOG_LOCK() bsd_log_lock()
	110	#define LOG_UNLOCK() bsd_log_unlock()
	111
1c79356b A	112
	113	/ARGSUSED/
	114	logopen(dev, flags, mode, p)
	115	dev_t dev;
	116	int flags, mode;
	117	struct proc *p;
	118	{
1c79356b A	119	LOG_LOCK();
	120	if (log_open) {
	121	LOG_UNLOCK();
1c79356b A	122	return (EBUSY);
	123	}
	124	log_open = 1;
	125	logsoftc.sc_pgid = p->p_pid; /* signal process only */
	126	/*
	127	* Potential race here with putchar() but since putchar should be
	128	* called by autoconf, msg_magic should be initialized by the time
	129	* we get here.
	130	*/
	131	if (msgbufp->msg_magic != MSG_MAGIC) {
	132	register int i;
	133
	134	msgbufp->msg_magic = MSG_MAGIC;
	135	msgbufp->msg_bufx = msgbufp->msg_bufr = 0;
	136	for (i=0; i < MSG_BSIZE; i++)
	137	msgbufp->msg_bufc[i] = 0;
	138	}
	139	LOG_UNLOCK();
9bccf70c	140
1c79356b A	141	return (0);
	142	}
	143
	144	/ARGSUSED/
	145	int
	146	logclose(dev, flag)
	147	dev_t dev;
	148	{
	149	int oldpri;
	150	LOG_LOCK();
	151	log_open = 0;
	152	selwakeup(&logsoftc.sc_selp);
1c79356b	153	selthreadclear(&logsoftc.sc_selp);
1c79356b A	154	LOG_UNLOCK();
	155	return (0);
	156	}
	157
	158	/ARGSUSED/
	159	int
	160	logread(dev, uio, flag)
	161	dev_t dev;
	162	struct uio *uio;
	163	int flag;
	164	{
	165	register long l;
	166	register int s;
	167	int error = 0;
91447636 A	168	char localbuff[MSG_BSIZE];
91447636 A	169	int copybytes;
1c79356b	170
91447636	171	LOG_LOCK();
1c79356b A	172	while (msgbufp->msg_bufr == msgbufp->msg_bufx) {
1c79356b A	173	if (flag & IO_NDELAY) {
91447636 A	174	error = EWOULDBLOCK;
91447636 A	175	goto out;
1c79356b A	176	}
1c79356b A	177	if (logsoftc.sc_state & LOG_NBIO) {
91447636 A	178	error = EWOULDBLOCK;
91447636 A	179	goto out;
1c79356b A	180	}
1c79356b A	181	logsoftc.sc_state \|= LOG_RDWAIT;
91447636 A	182	LOG_UNLOCK();
	183	/*
	184	* If the wakeup is missed the ligtening bolt will wake this up
	185	* if there are any new characters. If that doesn't do it
	186	* then wait for 5 sec and reevaluate
	187	*/
1c79356b	188	if (error = tsleep((caddr_t)msgbufp, LOG_RDPRI \| PCATCH,
91447636 A	189	"klog", 5 * hz)) {
	190	/* if it times out; ignore */
	191	if (error != EWOULDBLOCK)
	192	return (error);
1c79356b	193	}
91447636	194	LOG_LOCK();
1c79356b	195	}
1c79356b A	196	logsoftc.sc_state &= ~LOG_RDWAIT;
1c79356b A	197
91447636 A	198
91447636 A	199	while (uio_resid(uio) > 0) {
1c79356b A	200	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
	201	if (l < 0)
	202	l = MSG_BSIZE - msgbufp->msg_bufr;
91447636	203	l = min(l, uio_resid(uio));
1c79356b A	204	if (l == 0)
1c79356b A	205	break;
91447636 A	206	bcopy(&msgbufp->msg_bufc[msgbufp->msg_bufr], &localbuff[0], l);
	207	LOG_UNLOCK();
	208	error = uiomove((caddr_t)&localbuff[0],
1c79356b	209	(int)l, uio);
91447636	210	LOG_LOCK();
1c79356b A	211	if (error)
	212	break;
	213	msgbufp->msg_bufr += l;
	214	if (msgbufp->msg_bufr < 0 \|\| msgbufp->msg_bufr >= MSG_BSIZE)
	215	msgbufp->msg_bufr = 0;
	216	}
91447636 A	217	out:
91447636 A	218	LOG_UNLOCK();
1c79356b A	219	return (error);
	220	}
	221
	222	/ARGSUSED/
	223	int
0b4e3aa0	224	logselect(dev, rw, wql, p)
1c79356b A	225	dev_t dev;
1c79356b A	226	int rw;
0b4e3aa0	227	void * wql;
1c79356b A	228	struct proc *p;
1c79356b A	229	{
1c79356b A	230
	231	switch (rw) {
	232
	233	case FREAD:
91447636	234	LOG_LOCK();
1c79356b	235	if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
91447636	236	LOG_UNLOCK();
1c79356b A	237	return (1);
1c79356b A	238	}
0b4e3aa0	239	selrecord(p, &logsoftc.sc_selp, wql);
91447636	240	LOG_UNLOCK();
1c79356b A	241	break;
1c79356b A	242	}
1c79356b A	243	return (0);
	244	}
	245
	246	void
	247	logwakeup()
	248	{
	249	struct proc *p;
	250	int pgid;
	251	boolean_t funnel_state;
	252
91447636 A	253	LOG_LOCK();
	254	if (!log_open) {
	255	LOG_UNLOCK();
1c79356b	256	return;
91447636	257	}
1c79356b A	258	selwakeup(&logsoftc.sc_selp);
1c79356b A	259	if (logsoftc.sc_state & LOG_ASYNC) {
1c79356b A	260	pgid = logsoftc.sc_pgid;
	261	LOG_UNLOCK();
	262	if (pgid < 0)
	263	gsignal(-pgid, SIGIO);
	264	else if (p = pfind(pgid))
	265	psignal(p, SIGIO);
91447636	266	LOG_LOCK();
1c79356b A	267	}
	268	if (logsoftc.sc_state & LOG_RDWAIT) {
	269	wakeup((caddr_t)msgbufp);
	270	logsoftc.sc_state &= ~LOG_RDWAIT;
	271	}
91447636	272	LOG_UNLOCK();
1c79356b A	273	}
	274
	275	void
	276	klogwakeup()
	277	{
	278
	279	if (_logentrypend) {
	280	_logentrypend = 0;
	281	logwakeup();
	282	}
	283	}
	284
	285	/ARGSUSED/
	286	int
55e303ae	287	logioctl(dev, com, data, flag)
1c79356b A	288	caddr_t data;
	289	{
	290	long l;
	291	int s;
	292
91447636	293	LOG_LOCK();
1c79356b A	294	switch (com) {
	295
	296	/* return number of characters immediately available */
	297	case FIONREAD:
1c79356b	298	l = msgbufp->msg_bufx - msgbufp->msg_bufr;
1c79356b A	299	if (l < 0)
	300	l += MSG_BSIZE;
	301	(off_t )data = l;
	302	break;
	303
	304	case FIONBIO:
	305	if ((int )data)
	306	logsoftc.sc_state \|= LOG_NBIO;
	307	else
	308	logsoftc.sc_state &= ~LOG_NBIO;
	309	break;
	310
	311	case FIOASYNC:
	312	if ((int )data)
	313	logsoftc.sc_state \|= LOG_ASYNC;
	314	else
	315	logsoftc.sc_state &= ~LOG_ASYNC;
	316	break;
	317
	318	case TIOCSPGRP:
1c79356b	319	logsoftc.sc_pgid = (int )data;
1c79356b A	320	break;
	321
	322	case TIOCGPGRP:
1c79356b	323	(int )data = logsoftc.sc_pgid;
1c79356b A	324	break;
	325
	326	default:
91447636	327	LOG_UNLOCK();
1c79356b A	328	return (-1);
1c79356b A	329	}
91447636	330	LOG_UNLOCK();
1c79356b A	331	return (0);
	332	}
	333
	334	void
91447636	335	bsd_log_init()
1c79356b	336	{
91447636 A	337	if (!log_inited) {
	338	msgbufp = &temp_msgbuf;
	339	log_inited = 1;
	340	}
1c79356b A	341	}
	342
	343	void
	344	log_putc(char c)
	345	{
	346	register struct msgbuf *mbp;
	347
91447636 A	348	if (!log_inited) {
	349	panic("bsd log is not inited");
	350	}
	351	LOG_LOCK();
1c79356b A	352
	353	mbp = msgbufp;
	354	if (mbp-> msg_magic != MSG_MAGIC) {
	355	register int i;
	356
	357	mbp->msg_magic = MSG_MAGIC;
	358	mbp->msg_bufx = mbp->msg_bufr = 0;
	359	for (i=0; i < MSG_BSIZE; i++)
	360	mbp->msg_bufc[i] = 0;
	361	}
	362	mbp->msg_bufc[mbp->msg_bufx++] = c;
	363	_logentrypend = 1;
	364	if (mbp->msg_bufx < 0 \|\| mbp->msg_bufx >= MSG_BSIZE)
	365	mbp->msg_bufx = 0;
91447636	366	LOG_UNLOCK();
1c79356b	367	}
91447636	368