363 lines
9.9 KiB
C
363 lines
9.9 KiB
C
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/* $OpenBSD: kern_acct.c,v 1.47 2022/08/14 01:58:27 jsg Exp $ */
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/* $NetBSD: kern_acct.c,v 1.42 1996/02/04 02:15:12 christos 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
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/syslog.h>
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#include <sys/kernel.h>
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#include <sys/namei.h>
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#include <sys/errno.h>
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#include <sys/acct.h>
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#include <sys/resourcevar.h>
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#include <sys/tty.h>
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#include <sys/kthread.h>
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#include <sys/rwlock.h>
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#include <sys/syscallargs.h>
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/*
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* The routines implemented in this file are described in:
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* Leffler, et al.: The Design and Implementation of the 4.3BSD
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* UNIX Operating System (Addison Welley, 1989)
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* on pages 62-63.
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*
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* Arguably, to simplify accounting operations, this mechanism should
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* be replaced by one in which an accounting log file (similar to /dev/klog)
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* is read by a user process, etc. However, that has its own problems.
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*/
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/*
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* Internal accounting functions.
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*/
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comp_t encode_comp_t(u_long, u_long);
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int acct_start(void);
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void acct_thread(void *);
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void acct_shutdown(void);
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/*
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* Accounting vnode pointer, and saved vnode pointer.
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*/
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struct vnode *acctp;
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struct vnode *savacctp;
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/*
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* Lock protecting acctp and savacctp.
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*/
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struct rwlock acct_lock = RWLOCK_INITIALIZER("acctlk");
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/*
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* Values associated with enabling and disabling accounting
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*/
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int acctsuspend = 2; /* stop accounting when < 2% free space left */
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int acctresume = 4; /* resume when free space risen to > 4% */
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int acctrate = 15; /* delay (in seconds) between space checks */
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struct proc *acct_proc;
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/*
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* Accounting system call. Written based on the specification and
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* previous implementation done by Mark Tinguely.
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*/
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int
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sys_acct(struct proc *p, void *v, register_t *retval)
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{
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struct sys_acct_args /* {
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syscallarg(const char *) path;
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} */ *uap = v;
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struct nameidata nd;
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int error;
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/* Make sure that the caller is root. */
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if ((error = suser(p)) != 0)
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return (error);
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/*
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* If accounting is to be started to a file, open that file for
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* writing and make sure it's 'normal'.
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*/
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if (SCARG(uap, path) != NULL) {
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NDINIT(&nd, 0, 0, UIO_USERSPACE, SCARG(uap, path), p);
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if ((error = vn_open(&nd, FWRITE|O_APPEND, 0)) != 0)
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return (error);
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VOP_UNLOCK(nd.ni_vp);
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if (nd.ni_vp->v_type != VREG) {
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vn_close(nd.ni_vp, FWRITE, p->p_ucred, p);
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return (EACCES);
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}
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}
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rw_enter_write(&acct_lock);
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/*
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* If accounting was previously enabled, kill the old space-watcher,
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* close the file, and (if no new file was specified, leave).
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*/
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if (acctp != NULL || savacctp != NULL) {
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wakeup(&acct_proc);
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(void)vn_close((acctp != NULL ? acctp : savacctp), FWRITE,
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p->p_ucred, p);
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acctp = savacctp = NULL;
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}
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if (SCARG(uap, path) == NULL)
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goto out;
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/*
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* Save the new accounting file vnode, and schedule the new
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* free space watcher.
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*/
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acctp = nd.ni_vp;
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if ((error = acct_start()) != 0) {
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acctp = NULL;
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(void)vn_close(nd.ni_vp, FWRITE, p->p_ucred, p);
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}
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out:
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rw_exit_write(&acct_lock);
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return (error);
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}
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/*
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* Write out process accounting information, on process exit.
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* Data to be written out is specified in Leffler, et al.
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* and are enumerated below. (They're also noted in the system
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* "acct.h" header file.)
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*/
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int
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acct_process(struct proc *p)
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{
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struct acct acct;
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struct process *pr = p->p_p;
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struct rusage *r;
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struct timespec booted, elapsed, realstart, st, tmp, uptime, ut;
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int t;
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struct vnode *vp;
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int error = 0;
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/* If accounting isn't enabled, don't bother */
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if (acctp == NULL)
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return (0);
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rw_enter_read(&acct_lock);
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/*
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* Check the vnode again in case accounting got disabled while waiting
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* for the lock.
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*/
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vp = acctp;
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if (vp == NULL)
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goto out;
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/*
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* Get process accounting information.
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*/
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/* (1) The name of the command that ran */
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memcpy(acct.ac_comm, pr->ps_comm, sizeof acct.ac_comm);
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/* (2) The amount of user and system time that was used */
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calctsru(&pr->ps_tu, &ut, &st, NULL);
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acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_nsec);
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acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_nsec);
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/* (3) The elapsed time the command ran (and its starting time) */
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nanouptime(&uptime);
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nanoboottime(&booted);
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timespecadd(&booted, &pr->ps_start, &realstart);
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acct.ac_btime = realstart.tv_sec;
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timespecsub(&uptime, &pr->ps_start, &elapsed);
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acct.ac_etime = encode_comp_t(elapsed.tv_sec, elapsed.tv_nsec);
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/* (4) The average amount of memory used */
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r = &p->p_ru;
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timespecadd(&ut, &st, &tmp);
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t = tmp.tv_sec * hz + tmp.tv_nsec / (1000 * tick);
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if (t)
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acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
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else
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acct.ac_mem = 0;
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/* (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);
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/* (6) The UID and GID of the process */
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acct.ac_uid = pr->ps_ucred->cr_ruid;
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acct.ac_gid = pr->ps_ucred->cr_rgid;
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/* (7) The terminal from which the process was started */
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if ((pr->ps_flags & PS_CONTROLT) &&
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pr->ps_pgrp->pg_session->s_ttyp)
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acct.ac_tty = pr->ps_pgrp->pg_session->s_ttyp->t_dev;
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else
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acct.ac_tty = -1;
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/* (8) The boolean flags that tell how process terminated or misbehaved. */
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acct.ac_flag = pr->ps_acflag;
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/* Extensions */
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acct.ac_pid = pr->ps_pid;
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/*
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* Now, just write the accounting information to the file.
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*/
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error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
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(off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT|IO_NOLIMIT,
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p->p_ucred, NULL, p);
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out:
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rw_exit_read(&acct_lock);
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return (error);
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}
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/*
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* Encode_comp_t converts from ticks in seconds and microseconds
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* to ticks in 1/AHZ seconds. The encoding is described in
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* Leffler, et al., on page 63.
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*/
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#define MANTSIZE 13 /* 13 bit mantissa. */
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#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
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#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
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comp_t
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encode_comp_t(u_long s, u_long ns)
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{
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int exp, rnd;
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exp = 0;
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rnd = 0;
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s *= AHZ;
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s += ns / (1000000000 / AHZ); /* Maximize precision. */
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while (s > MAXFRACT) {
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rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
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s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
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exp++;
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}
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/* If we need to round up, do it (and handle overflow correctly). */
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if (rnd && (++s > MAXFRACT)) {
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s >>= EXPSIZE;
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exp++;
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}
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/* Clean it up and polish it off. */
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exp <<= MANTSIZE; /* Shift the exponent into place */
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exp += s; /* and add on the mantissa. */
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return (exp);
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}
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int
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acct_start(void)
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{
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/* Already running. */
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if (acct_proc != NULL)
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return (0);
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return (kthread_create(acct_thread, NULL, &acct_proc, "acct"));
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}
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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
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* has been vgone()'d out from underneath us, e.g. when the file
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* system containing the accounting file has been forcibly unmounted.
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*/
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void
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acct_thread(void *arg)
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{
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struct statfs sb;
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struct proc *p = curproc;
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rw_enter_write(&acct_lock);
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for (;;) {
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if (savacctp != NULL) {
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if (savacctp->v_type == VBAD) {
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(void) vn_close(savacctp, FWRITE, NOCRED, p);
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savacctp = NULL;
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break;
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}
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(void)VFS_STATFS(savacctp->v_mount, &sb, NULL);
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if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
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acctp = savacctp;
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savacctp = NULL;
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log(LOG_NOTICE, "Accounting resumed\n");
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}
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} else if (acctp != NULL) {
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if (acctp->v_type == VBAD) {
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(void) vn_close(acctp, FWRITE, NOCRED, p);
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acctp = NULL;
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break;
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}
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(void)VFS_STATFS(acctp->v_mount, &sb, NULL);
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if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
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savacctp = acctp;
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acctp = NULL;
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log(LOG_NOTICE, "Accounting suspended\n");
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}
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} else {
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break;
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}
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rwsleep_nsec(&acct_proc, &acct_lock, PPAUSE, "acct",
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SEC_TO_NSEC(acctrate));
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}
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acct_proc = NULL;
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rw_exit_write(&acct_lock);
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kthread_exit(0);
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}
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void
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acct_shutdown(void)
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{
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struct proc *p = curproc;
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rw_enter_write(&acct_lock);
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if (acctp != NULL || savacctp != NULL) {
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vn_close((acctp != NULL ? acctp : savacctp), FWRITE,
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NOCRED, p);
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acctp = savacctp = NULL;
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}
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rw_exit_write(&acct_lock);
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}
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