NetBSD/sys/kern/subr_acct.c

269 lines
6.2 KiB
C
Raw Normal View History

/*
* Copyright (c) 1993 Christopher G. Demetriou
* 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_acct.c,v 1.2 1993/05/18 18:19:18 cgd Exp $
*/
/*
* acct buffer for accounting information
*/
#include "param.h"
#include "proc.h"
#include "vnode.h"
#include "ioctl.h"
#include "file.h"
#include "malloc.h"
#include "acct.h"
#include "acctbuf.h"
#include "select.h"
#define ACCT_RDPRI (PZERO + 1)
#define ACCT_ASYNC 0x04
#define ACCT_RDWAIT 0x08
struct acctsoftc {
int sc_state; /* see above for possibilities */
struct selinfo sc_selp; /* process waiting on select call */
int sc_pgid; /* process/group for async I/O */
} acctsoftc;
int acct_open; /* also used in acct() */
struct acctbuf *acctbufp; /* the accounting buffer pointer */
/*ARGSUSED*/
acctopen(dev, flags, mode, p)
dev_t dev;
int flags, mode;
struct proc *p;
{
if (acct_open)
return (EBUSY);
acct_open = 1;
acctsoftc.sc_pgid = p->p_pid; /* signal process only */
if (acctbufp == NULL)
acctbuf_init();
#ifdef ACCT_DEBUG
acctbuf_checkbuf("acctopen");
#endif
return (0);
}
/*ARGSUSED*/
acctclose(dev, flag)
dev_t dev;
{
acct_open = 0;
acctsoftc.sc_state = 0;
bzero(&acctsoftc.sc_selp,sizeof(acctsoftc.sc_selp));
}
/*ARGSUSED*/
acctread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
register struct acctbuf *abp = acctbufp;
register long l;
register int s;
int error = 0;
#ifdef ACCT_DEBUG
acctbuf_checkbuf("acctread 1");
#endif
while (abp->ab_rind == abp->ab_wind) {
if (flag & IO_NDELAY) {
return (EWOULDBLOCK);
}
acctsoftc.sc_state |= ACCT_RDWAIT;
if (error = tsleep((caddr_t)abp, ACCT_RDPRI | PCATCH,
"acct", 0)) {
return (error);
}
}
acctsoftc.sc_state &= ~ACCT_RDWAIT;
while (uio->uio_resid > 0) {
l = abp->ab_wind - abp->ab_rind;
if (l < 0)
l = ACCT_NBRECS - abp->ab_rind;
l = MIN(l, uio->uio_resid / sizeof(struct acct));
if (l == 0)
break;
error = uiomove((caddr_t)&abp->recs[abp->ab_rind],
(int)(l * sizeof(struct acct)), uio);
if (error)
break;
abp->ab_rind += l;
if (abp->ab_rind < 0 || abp->ab_rind >= ACCT_NBRECS)
abp->ab_rind = 0;
}
#ifdef ACCT_DEBUG
acctbuf_checkbuf("acctread 2");
#endif
return (error);
}
/*ARGSUSED*/
acctselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
{
switch (rw) {
case FREAD:
#ifdef ACCT_DEBUG
acctbuf_checkbuf("acctselect");
#endif
if (acctbufp->ab_rind != acctbufp->ab_wind) {
return (1);
}
selrecord(p, &acctsoftc.sc_selp);
break;
}
return (0);
}
acctwakeup()
{
struct proc *p;
if (!acct_open)
return;
selwakeup(&acctsoftc.sc_selp);
if (acctsoftc.sc_state & ACCT_ASYNC) {
if (acctsoftc.sc_pgid < 0)
gsignal(-acctsoftc.sc_pgid, SIGIO);
else if (p = pfind(acctsoftc.sc_pgid))
psignal(p, SIGIO);
}
if (acctsoftc.sc_state & ACCT_RDWAIT) {
wakeup((caddr_t)acctbufp);
acctsoftc.sc_state &= ~ACCT_RDWAIT;
}
}
/*ARGSUSED*/
acctioctl(dev, com, data, flag)
caddr_t data;
{
long l;
int s;
switch (com) {
/* return number of characters immediately available */
case FIONREAD:
#ifdef ACCT_DEBUG
acctbuf_checkbuf("acctioctl");
#endif
l = acctbufp->ab_wind - acctbufp->ab_rind;
if (l < 0)
l += ACCT_NBRECS;
*(off_t *)data = l * sizeof(struct acct);
break;
case FIONBIO:
break;
case FIOASYNC:
if (*(int *)data)
acctsoftc.sc_state |= ACCT_ASYNC;
else
acctsoftc.sc_state &= ~ACCT_ASYNC;
break;
case TIOCSPGRP:
acctsoftc.sc_pgid = *(int *)data;
break;
case TIOCGPGRP:
*(int *)data = acctsoftc.sc_pgid;
break;
default:
return (-1);
}
return (0);
}
void
acctbuf_init()
{
if (acctbufp != NULL)
panic("acctbuf reinit\n");
acctbufp = malloc(ACCT_BSIZE, M_DEVBUF, M_WAITOK);
if (acctbufp == NULL)
panic("acctbuf_init: couldn't allocate accounting buffer\n");
bzero(acctbufp, ACCT_BSIZE);
acctbufp->ab_magic = ACCT_MAGIC;
}
#ifdef ACCT_DEBUG
void
acctbuf_checkbuf(char *from)
{
char *str;
int dopanic = 0;
if (acctbufp == NULL) {
str = "accounting buffer pointer null";
dopanic = 1;
}
if (acctbufp->ab_magic != ACCT_MAGIC) {
str = "accounting buffer magic bad";
dopanic = 1;
}
if (acctbufp->ab_rind < 0 || acctbufp->ab_rind >= ACCT_NBRECS) {
str = "accounting buffer read index out of range";
dopanic = 1;
}
if (acctbufp->ab_wind < 0 || acctbufp->ab_wind >= ACCT_NBRECS) {
str = "accounting buffer write index out of range";
dopanic = 1;
}
if (dopanic) {
printf("acctbuf_checkbuf: from %s\n", from);
panic(str);
}
}
#endif