1.\" $NetBSD: acct.5,v 1.12 2024/08/05 13:04:14 christos Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)acct.5 8.1 (Berkeley) 6/5/93 31.\" 32.Dd August 5, 2024 33.Dt ACCT 5 34.Os 35.Sh NAME 36.Nm acct 37.Nd execution accounting file 38.Sh SYNOPSIS 39.In sys/acct.h 40.Sh DESCRIPTION 41The kernel maintains the following 42.Fa acct 43information structure for all 44processes. If a process terminates, and accounting is enabled, 45the kernel calls the 46.Xr acct_process 9 47function call to prepare and append the record 48to the accounting file. 49.Bd -literal 50/* 51 * Accounting structures; these use a comp_t type which is a 3 bits base 8 52 * exponent, 13 bit fraction ``floating point'' number. Units are 1/AHZ 53 * seconds. 54 */ 55typedef uint16_t comp_t; 56 57struct acct { 58 char ac_comm[16]; /* name of command */ 59 comp_t ac_utime; /* user time */ 60 comp_t ac_stime; /* system time */ 61 comp_t ac_etime; /* elapsed time */ 62 time_t ac_btime; /* starting time */ 63 uid_t ac_uid; /* user id */ 64 gid_t ac_gid; /* group id */ 65 uint16_t ac_mem; /* memory usage average */ 66 comp_t ac_io; /* count of IO blocks */ 67 dev_t ac_tty; /* controlling tty */ 68#define AFORK 0x01 /* fork'd but not exec'd */ 69#define ASU 0x02 /* used super-user permissions */ 70#define ACOMPAT 0x04 /* used compatibility mode */ 71#define ACORE 0x08 /* dumped core */ 72#define AXSIG 0x10 /* killed by a signal */ 73 uint8_t ac_flag; /* accounting flags */ 74}; 75 76/* 77 * 1/AHZ is the granularity of the data encoded in the comp_t fields. 78 * This is not necessarily equal to hz. 79 */ 80#define AHZ 64 81 82#ifdef _KERNEL 83void acct_init(void); 84int acct_process(struct lwp *); 85endif 86.Ed 87.Pp 88If a terminated process was created by an 89.Xr execve 2 , 90the name of the executed file (at most ten characters of it) 91is saved in the field 92.Fa ac_comm 93and its status is saved by setting one of more of the following flags in 94.Fa ac_flag : 95.Dv AFORK , 96.Dv ACORE , 97and 98.Dv AXSIG . 99.Pp 100The 101.Dv ASU 102flag is not recorded anymore because with the switch to 103.Xr kauth 9 , 104the superuser model is optional and passing the affected process to every 105authorization call in order to record 106.Dv ASU 107in 108.Fa p_acflag , 109would require many source changes and would not reflect reality because 110the authorization decision might not have been done based on the 111.Xr secmodel_suser 9 112model. 113.Pp 114The 115.Dv ACOMPAT 116flag was never recorded in 117.Nx ; 118we could consider setting when the a process is running under emulation, 119but this is not currently done. 120.Pp 121Both the 122.Dv ASU 123and the 124.Dv ACOMPAT 125flags are retained for source compatibility. 126.Sh SEE ALSO 127.Xr lastcomm 1 , 128.Xr acct 2 , 129.Xr execve 2 , 130.Xr accton 8 , 131.Xr sa 8 , 132.Xr acct_process 9 133.Sh HISTORY 134A 135.Nm 136file format appeared in 137.At v7 . 138