BSD 4_3_Net_2 release

[unix-history] / usr / src / sys / kern / kern_acct.c

/*
* Copyright (c) 1982, 1986, 1989 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: @(#)kern_acct.c   7.18 (Berkeley) 5/11/91
*/

#include "param.h"
#include "systm.h"
#include "namei.h"
#include "resourcevar.h"
#include "proc.h"
#include "ioctl.h"
#include "termios.h"
#include "tty.h"
#include "vnode.h"
#include "mount.h"
#include "kernel.h"
#include "file.h"
#include "acct.h"
#include "syslog.h"

/*
* Values associated with enabling and disabling accounting
*/
int     acctsuspend = 2;        /* stop accounting when < 2% free space left */
int     acctresume = 4;         /* resume when free space risen to > 4% */
struct  timeval chk = { 15, 0 };/* frequency to check space for accounting */
struct  vnode *acctp;           /* file to which to do accounting */
struct  vnode *savacctp;        /* file to which to do accounting when space */

/*
* Enable or disable process accounting.
*
* If a non-null filename is given, that file is used to store accounting
* records on process exit. If a null filename is given process accounting
* is suspended. If accounting is enabled, the system checks the amount
* of freespace on the filesystem at timeval intervals. If the amount of
* freespace is below acctsuspend percent, accounting is suspended. If
* accounting has been suspended, and freespace rises above acctresume,
* accounting is resumed.
*/
/* ARGSUSED */
sysacct(p, uap, retval)
       struct proc *p;
       struct args {
               char    *fname;
       } *uap;
       int *retval;
{

       /*
        * Body deleted.
        */
       return (ENOSYS);
}

/*
* Periodically check the file system to see if accounting
* should be turned on or off.
*/
acctwatch(resettime)
       struct timeval *resettime;
{
       struct statfs sb;

       if (savacctp) {
               (void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
               if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
                       acctp = savacctp;
                       savacctp = NULL;
                       log(LOG_NOTICE, "Accounting resumed\n");
                       return;
               }
       }
       if (acctp == NULL)
               return;
       (void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
       if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
               savacctp = acctp;
               acctp = NULL;
               log(LOG_NOTICE, "Accounting suspended\n");
       }
       timeout(acctwatch, (caddr_t)resettime, hzto(resettime));
}

/*
* This routine calculates an accounting record for a process and,
* if accounting is enabled, writes it to the accounting file.
*/
acct(p)
       register struct proc *p;
{

       /*
        * Body deleted.
        */
       return;
}