4e2f199e0c
Reformat and initialize correctly all "struct cdevsw".
Initialize the d_maj and d_bmaj fields.
The d_reset field was not removed, although it is never used.
I used a program to do most of this, so all the files now use the
same consistent format. Please keep it that way.
Vinum and i4b not modified, patches emailed to respective authors.
292 lines
6.6 KiB
C
292 lines
6.6 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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_log.c 8.1 (Berkeley) 6/10/93
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* $Id: subr_log.c,v 1.34 1999/05/06 18:12:46 peter Exp $
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*/
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/*
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* Error log buffer for kernel printf's.
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*/
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#include "opt_devfs.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/filio.h>
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#include <sys/ttycom.h>
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#include <sys/msgbuf.h>
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#include <sys/signalvar.h>
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#include <sys/kernel.h>
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#include <sys/poll.h>
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#include <sys/filedesc.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#define LOG_RDPRI (PZERO + 1)
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#define LOG_ASYNC 0x04
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#define LOG_RDWAIT 0x08
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static d_open_t logopen;
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static d_close_t logclose;
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static d_read_t logread;
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static d_ioctl_t logioctl;
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static d_poll_t logpoll;
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#define CDEV_MAJOR 7
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static struct cdevsw log_cdevsw = {
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/* open */ logopen,
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/* close */ logclose,
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/* read */ logread,
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/* write */ nowrite,
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/* ioctl */ logioctl,
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/* stop */ nostop,
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/* reset */ noreset,
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/* devtotty */ nodevtotty,
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/* poll */ logpoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "log",
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/* parms */ noparms,
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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/* maxio */ 0,
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/* bmaj */ -1
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};
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static struct logsoftc {
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int sc_state; /* see above for possibilities */
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struct selinfo sc_selp; /* process waiting on select call */
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struct sigio *sc_sigio; /* information for async I/O */
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} logsoftc;
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int log_open; /* also used in log() */
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/*ARGSUSED*/
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static int
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logopen(dev, flags, mode, p)
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dev_t dev;
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int flags, mode;
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struct proc *p;
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{
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if (log_open)
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return (EBUSY);
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log_open = 1;
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fsetown(p->p_pid, &logsoftc.sc_sigio); /* signal process only */
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return (0);
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}
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/*ARGSUSED*/
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static int
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logclose(dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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log_open = 0;
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logsoftc.sc_state = 0;
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funsetown(logsoftc.sc_sigio);
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return (0);
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}
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/*ARGSUSED*/
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static int
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logread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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register struct msgbuf *mbp = msgbufp;
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register long l;
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register int s;
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int error = 0;
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s = splhigh();
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while (mbp->msg_bufr == mbp->msg_bufx) {
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if (flag & IO_NDELAY) {
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splx(s);
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return (EWOULDBLOCK);
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}
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logsoftc.sc_state |= LOG_RDWAIT;
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if ((error = tsleep((caddr_t)mbp, LOG_RDPRI | PCATCH,
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"klog", 0))) {
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splx(s);
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return (error);
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}
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}
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splx(s);
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logsoftc.sc_state &= ~LOG_RDWAIT;
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while (uio->uio_resid > 0) {
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l = mbp->msg_bufx - mbp->msg_bufr;
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if (l < 0)
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l = mbp->msg_size - mbp->msg_bufr;
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l = min(l, uio->uio_resid);
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if (l == 0)
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break;
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error = uiomove((caddr_t)msgbufp->msg_ptr + mbp->msg_bufr,
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(int)l, uio);
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if (error)
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break;
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mbp->msg_bufr += l;
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if (mbp->msg_bufr >= mbp->msg_size)
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mbp->msg_bufr = 0;
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}
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return (error);
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}
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/*ARGSUSED*/
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static int
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logpoll(dev, events, p)
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dev_t dev;
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int events;
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struct proc *p;
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{
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int s;
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int revents = 0;
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s = splhigh();
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if (events & (POLLIN | POLLRDNORM)) {
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if (msgbufp->msg_bufr != msgbufp->msg_bufx)
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revents |= events & (POLLIN | POLLRDNORM);
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else
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selrecord(p, &logsoftc.sc_selp);
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}
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splx(s);
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return (revents);
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}
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void
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logwakeup()
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{
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if (!log_open)
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return;
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selwakeup(&logsoftc.sc_selp);
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if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
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pgsigio(logsoftc.sc_sigio, SIGIO, 0);
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if (logsoftc.sc_state & LOG_RDWAIT) {
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wakeup((caddr_t)msgbufp);
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logsoftc.sc_state &= ~LOG_RDWAIT;
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}
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}
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/*ARGSUSED*/
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static int
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logioctl(dev, com, data, flag, p)
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dev_t dev;
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u_long com;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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long l;
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int s;
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switch (com) {
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/* return number of characters immediately available */
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case FIONREAD:
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s = splhigh();
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l = msgbufp->msg_bufx - msgbufp->msg_bufr;
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splx(s);
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if (l < 0)
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l += msgbufp->msg_size;
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*(int *)data = l;
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break;
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case FIONBIO:
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break;
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case FIOASYNC:
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if (*(int *)data)
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logsoftc.sc_state |= LOG_ASYNC;
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else
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logsoftc.sc_state &= ~LOG_ASYNC;
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break;
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case FIOSETOWN:
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return (fsetown(*(int *)data, &logsoftc.sc_sigio));
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case FIOGETOWN:
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*(int *)data = fgetown(logsoftc.sc_sigio);
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break;
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/* This is deprecated, FIOSETOWN should be used instead. */
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case TIOCSPGRP:
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return (fsetown(-(*(int *)data), &logsoftc.sc_sigio));
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/* This is deprecated, FIOGETOWN should be used instead */
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case TIOCGPGRP:
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*(int *)data = -fgetown(logsoftc.sc_sigio);
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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static int log_devsw_installed;
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#ifdef DEVFS
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static void *log_devfs_token;
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#endif
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static void log_drvinit __P((void *unused));
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static void
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log_drvinit(unused)
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void *unused;
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{
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dev_t dev;
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if( ! log_devsw_installed ) {
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dev = makedev(CDEV_MAJOR,0);
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cdevsw_add(&dev,&log_cdevsw,NULL);
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log_devsw_installed = 1;
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#ifdef DEVFS
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log_devfs_token = devfs_add_devswf(&log_cdevsw, 0, DV_CHR,
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UID_ROOT, GID_WHEEL, 0600,
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"klog");
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#endif
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}
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}
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SYSINIT(logdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,log_drvinit,NULL)
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