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Annotation of Net2/kern/kern_acct.c, revision 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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