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Annotation of Net2/kern/kern_acct.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  *
                     33:  *     from: @(#)kern_acct.c   7.18 (Berkeley) 5/11/91
                     34:  */
                     35: 
                     36: #include "param.h"
                     37: #include "systm.h"
                     38: #include "namei.h"
                     39: #include "resourcevar.h"
                     40: #include "proc.h"
                     41: #include "ioctl.h"
                     42: #include "termios.h"
                     43: #include "tty.h"
                     44: #include "vnode.h"
                     45: #include "mount.h"
                     46: #include "kernel.h"
                     47: #include "file.h"
                     48: #include "acct.h"
                     49: #include "syslog.h"
                     50: 
                     51: /*
                     52:  * Values associated with enabling and disabling accounting
                     53:  */
                     54: int    acctsuspend = 2;        /* stop accounting when < 2% free space left */
                     55: int    acctresume = 4;         /* resume when free space risen to > 4% */
                     56: struct timeval chk = { 15, 0 };/* frequency to check space for accounting */
                     57: struct  vnode *acctp;          /* file to which to do accounting */
                     58: struct  vnode *savacctp;       /* file to which to do accounting when space */
                     59: 
                     60: /*
                     61:  * Enable or disable process accounting.
                     62:  *
                     63:  * If a non-null filename is given, that file is used to store accounting
                     64:  * records on process exit. If a null filename is given process accounting
                     65:  * is suspended. If accounting is enabled, the system checks the amount
                     66:  * of freespace on the filesystem at timeval intervals. If the amount of
                     67:  * freespace is below acctsuspend percent, accounting is suspended. If
                     68:  * accounting has been suspended, and freespace rises above acctresume,
                     69:  * accounting is resumed.
                     70:  */
                     71: /* ARGSUSED */
                     72: sysacct(p, uap, retval)
                     73:        struct proc *p;
                     74:        struct args {
                     75:                char    *fname;
                     76:        } *uap;
                     77:        int *retval;
                     78: {
                     79: 
                     80:        /*
                     81:         * Body deleted.
                     82:         */
                     83:        return (ENOSYS);
                     84: }
                     85: 
                     86: /*
                     87:  * Periodically check the file system to see if accounting
                     88:  * should be turned on or off.
                     89:  */
                     90: acctwatch(resettime)
                     91:        struct timeval *resettime;
                     92: {
                     93:        struct statfs sb;
                     94: 
                     95:        if (savacctp) {
                     96:                (void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
                     97:                if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
                     98:                        acctp = savacctp;
                     99:                        savacctp = NULL;
                    100:                        log(LOG_NOTICE, "Accounting resumed\n");
                    101:                        return;
                    102:                }
                    103:        }
                    104:        if (acctp == NULL)
                    105:                return;
                    106:        (void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
                    107:        if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
                    108:                savacctp = acctp;
                    109:                acctp = NULL;
                    110:                log(LOG_NOTICE, "Accounting suspended\n");
                    111:        }
                    112:        timeout(acctwatch, (caddr_t)resettime, hzto(resettime));
                    113: }
                    114: 
                    115: /*
                    116:  * This routine calculates an accounting record for a process and,
                    117:  * if accounting is enabled, writes it to the accounting file.
                    118:  */
                    119: acct(p)
                    120:        register struct proc *p;
                    121: {
                    122: 
                    123:        /*
                    124:         * Body deleted.
                    125:         */
                    126:        return;
                    127: }

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