NetBSD/sys/kern/subr_log.c

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/*
* Copyright (c) 1982, 1986 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.
*
* from: @(#)subr_log.c 7.11 (Berkeley) 3/17/91
* $Id: subr_log.c,v 1.3 1993/06/27 06:01:52 andrew Exp $
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*/
/*
* Error log buffer for kernel printf's.
*/
#include "param.h"
#include "systm.h"
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#include "proc.h"
#include "vnode.h"
#include "ioctl.h"
#include "msgbuf.h"
#include "file.h"
#include "select.h"
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#define LOG_RDPRI (PZERO + 1)
#define LOG_ASYNC 0x04
#define LOG_RDWAIT 0x08
struct logsoftc {
int sc_state; /* see above for possibilities */
struct selinfo sc_selp; /* process waiting on select call */
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int sc_pgid; /* process/group for async I/O */
} logsoftc;
int log_open; /* also used in log() */
/*ARGSUSED*/
int
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logopen(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
register struct msgbuf *mbp = msgbufp;
if (log_open)
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 (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;
}
return (0);
}
/*ARGSUSED*/
int
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logclose(dev, flag)
dev_t dev;
int flag;
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{
log_open = 0;
logsoftc.sc_state = 0;
bzero(&logsoftc.sc_selp, sizeof(logsoftc.sc_selp));
return 0;
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}
/*ARGSUSED*/
int
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logread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct msgbuf *mbp = msgbufp;
register long l;
register int s;
int error = 0;
s = splhigh();
while (mbp->msg_bufr == mbp->msg_bufx) {
if (flag & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
}
logsoftc.sc_state |= LOG_RDWAIT;
if (error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
"klog", 0)) {
splx(s);
return (error);
}
}
splx(s);
logsoftc.sc_state &= ~LOG_RDWAIT;
while (uio->uio_resid > 0) {
l = mbp->msg_bufx - mbp->msg_bufr;
if (l < 0)
l = MSG_BSIZE - mbp->msg_bufr;
l = MIN(l, uio->uio_resid);
if (l == 0)
break;
error = uiomove((caddr_t)&mbp->msg_bufc[mbp->msg_bufr],
(int)l, uio);
if (error)
break;
mbp->msg_bufr += l;
if (mbp->msg_bufr < 0 || mbp->msg_bufr >= MSG_BSIZE)
mbp->msg_bufr = 0;
}
return (error);
}
/*ARGSUSED*/
int
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logselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
{
int s = splhigh();
switch (rw) {
case FREAD:
if (msgbufp->msg_bufr != msgbufp->msg_bufx) {
splx(s);
return (1);
}
selrecord(p, &logsoftc.sc_selp);
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break;
}
splx(s);
return (0);
}
void
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logwakeup()
{
struct proc *p;
if (!log_open)
return;
selwakeup(&logsoftc.sc_selp);
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if (logsoftc.sc_state & LOG_ASYNC) {
if (logsoftc.sc_pgid < 0)
gsignal(-logsoftc.sc_pgid, SIGIO);
else if (p = pfind(logsoftc.sc_pgid))
psignal(p, SIGIO);
}
if (logsoftc.sc_state & LOG_RDWAIT) {
wakeup((caddr_t)msgbufp);
logsoftc.sc_state &= ~LOG_RDWAIT;
}
}
/*ARGSUSED*/
int
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logioctl(dev, com, data, flag)
dev_t dev;
int com;
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caddr_t data;
int flag;
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{
long l;
int s;
switch (com) {
/* return number of characters immediately available */
case FIONREAD:
s = splhigh();
l = msgbufp->msg_bufx - msgbufp->msg_bufr;
splx(s);
if (l < 0)
l += MSG_BSIZE;
*(off_t *)data = l;
break;
case FIONBIO:
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:
return (-1);
}
return (0);
}