NetBSD/sys/kern/kern_acct.c

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/* $NetBSD: kern_acct.c,v 1.39 1995/03/21 13:33:46 mycroft Exp $ */
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/*-
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* Copyright (c) 1994 Christopher G. Demetriou
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* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
*
* @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
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*/
#include <sys/param.h>
#include <sys/systm.h>
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#include <sys/proc.h>
#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
#include <sys/syslog.h>
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#include <sys/kernel.h>
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#include <sys/namei.h>
#include <sys/errno.h>
#include <sys/acct.h>
#include <sys/resourcevar.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
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#include <sys/syscallargs.h>
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/*
* The routines implemented in this file are described in:
* Leffler, et al.: The Design and Implementation of the 4.3BSD
* UNIX Operating System (Addison Welley, 1989)
* on pages 62-63.
*
* Arguably, to simplify accounting operations, this mechanism should
* be replaced by one in which an accounting log file (similar to /dev/klog)
* is read by a user process, etc. However, that has its own problems.
*/
/*
* Internal accounting functions.
* The former's operation is described in Leffler, et al., and the latter
* was provided by UCB with the 4.4BSD-Lite release
*/
comp_t encode_comp_t __P((u_long, u_long));
void acctwatch __P((void *));
/*
* Accounting vnode pointer, and saved vnode pointer.
*/
struct vnode *acctp;
struct vnode *savacctp;
/*
* 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% */
int acctchkfreq = 15; /* frequency (in seconds) to check space */
/*
* Accounting system call. Written based on the specification and
* previous implementation done by Mark Tinguely.
*/
int
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acct(p, uap, retval)
struct proc *p;
struct acct_args /* {
syscallarg(char *) path;
} */ *uap;
register_t *retval;
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{
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struct nameidata nd;
int error;
/* Make sure that the caller is root. */
if (error = suser(p->p_ucred, &p->p_acflag))
return (error);
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/*
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* If accounting is to be started to a file, open that file for
* writing and make sure it's a 'normal'.
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*/
if (SCARG(uap, path) != NULL) {
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path),
p);
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if (error = vn_open(&nd, FWRITE, 0))
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return (error);
VOP_UNLOCK(nd.ni_vp);
if (nd.ni_vp->v_type != VREG) {
vn_close(nd.ni_vp, FWRITE, p->p_ucred, p);
return (EACCES);
}
}
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/*
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* If accounting was previously enabled, kill the old space-watcher,
* close the file, and (if no new file was specified, leave).
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*/
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if (acctp != NULLVP || savacctp != NULLVP) {
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untimeout(acctwatch, NULL);
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error = vn_close((acctp != NULLVP ? acctp : savacctp), FWRITE,
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p->p_ucred, p);
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acctp = savacctp = NULLVP;
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}
if (SCARG(uap, path) == NULL)
return (error);
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/*
* Save the new accounting file vnode, and schedule the new
* free space watcher.
*/
acctp = nd.ni_vp;
acctwatch(NULL);
return (error);
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}
/*
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* Write out process accounting information, on process exit.
* Data to be written out is specified in Leffler, et al.
* and are enumerated below. (They're also noted in the system
* "acct.h" header file.)
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*/
int
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acct_process(p)
struct proc *p;
{
struct acct acct;
struct rusage *r;
struct timeval ut, st, tmp;
int s, t;
struct vnode *vp;
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/* If accounting isn't enabled, don't bother */
vp = acctp;
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if (vp == NULLVP)
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return (0);
/*
* Get process accounting information.
*/
/* (1) The name of the command that ran */
bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
/* (2) The amount of user and system time that was used */
calcru(p, &ut, &st, NULL);
acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
/* (3) The elapsed time the commmand ran (and its starting time) */
acct.ac_btime = p->p_stats->p_start.tv_sec;
s = splclock();
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timersub(&time, &p->p_stats->p_start, &tmp);
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splx(s);
acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
/* (4) The average amount of memory used */
r = &p->p_stats->p_ru;
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timeradd(&ut, &st, &tmp);
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t = tmp.tv_sec * hz + tmp.tv_usec / tick;
if (t)
acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
else
acct.ac_mem = 0;
/* (5) The number of disk I/O operations done */
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acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
/* (6) The UID and GID of the process */
acct.ac_uid = p->p_cred->p_ruid;
acct.ac_gid = p->p_cred->p_rgid;
/* (7) The terminal from which the process was started */
if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
acct.ac_tty = p->p_pgrp->pg_session->s_ttyp->t_dev;
else
acct.ac_tty = NODEV;
/* (8) The boolean flags that tell how the process terminated, etc. */
acct.ac_flag = p->p_acflag;
/*
* Now, just write the accounting information to the file.
*/
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VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
return (vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
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(off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, p->p_ucred,
(int *)0, p));
}
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/*
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* Encode_comp_t converts from ticks in seconds and microseconds
* to ticks in 1/AHZ seconds. The encoding is described in
* Leffler, et al., on page 63.
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*/
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#define MANTSIZE 13 /* 13 bit mantissa. */
#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
comp_t
encode_comp_t(s, us)
u_long s, us;
{
int exp, rnd;
exp = 0;
rnd = 0;
s *= AHZ;
s += us / (1000000 / AHZ); /* Maximize precision. */
while (s > MAXFRACT) {
rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
exp++;
}
/* If we need to round up, do it (and handle overflow correctly). */
if (rnd && (++s > MAXFRACT)) {
s >>= EXPSIZE;
exp++;
}
/* Clean it up and polish it off. */
exp <<= MANTSIZE; /* Shift the exponent into place */
exp += s; /* and add on the mantissa. */
return (exp);
}
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/*
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* Periodically check the file system to see if accounting
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* should be turned on or off. Beware the case where the vnode
* has been vgone()'d out from underneath us, e.g. when the file
* system containing the accounting file has been forcibly unmounted.
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*/
/* ARGSUSED */
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void
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acctwatch(a)
void *a;
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{
struct statfs sb;
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if (savacctp != NULLVP) {
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if (savacctp->v_type == VBAD) {
(void) vn_close(savacctp, FWRITE, NOCRED, NULL);
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savacctp = NULLVP;
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return;
}
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(void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
acctp = savacctp;
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savacctp = NULLVP;
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log(LOG_NOTICE, "Accounting resumed\n");
}
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} else if (acctp != NULLVP) {
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if (acctp->v_type == VBAD) {
(void) vn_close(acctp, FWRITE, NOCRED, NULL);
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acctp = NULLVP;
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return;
}
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(void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
savacctp = acctp;
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acctp = NULLVP;
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log(LOG_NOTICE, "Accounting suspended\n");
}
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} else
return;
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timeout(acctwatch, NULL, acctchkfreq * hz);
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}