1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)acct.5 8.1 (Berkeley) 6/5/93 33.\" $FreeBSD$ 34.\" 35.Dd May 15, 2007 36.Dt ACCT 5 37.Os 38.Sh NAME 39.Nm acct 40.Nd execution accounting file 41.Sh SYNOPSIS 42.In sys/types.h 43.In sys/acct.h 44.Sh DESCRIPTION 45The kernel maintains the following 46.Fa acct 47information structure for all 48processes. 49If a process terminates, and accounting is enabled, 50the kernel calls the 51.Xr acct 2 52function call to prepare and append the record 53to the accounting file. 54.Bd -literal 55#define AC_COMM_LEN 16 56 57/* 58 * Accounting structure version 2 (current). 59 * The first byte is always zero. 60 * Time units are microseconds. 61 */ 62 63struct acctv2 { 64 uint8_t ac_zero; /* zero identifies new version */ 65 uint8_t ac_version; /* record version number */ 66 uint16_t ac_len; /* record length */ 67 68 char ac_comm[AC_COMM_LEN]; /* command name */ 69 float ac_utime; /* user time */ 70 float ac_stime; /* system time */ 71 float ac_etime; /* elapsed time */ 72 time_t ac_btime; /* starting time */ 73 uid_t ac_uid; /* user id */ 74 gid_t ac_gid; /* group id */ 75 float ac_mem; /* average memory usage */ 76 float ac_io; /* count of IO blocks */ 77 __dev_t ac_tty; /* controlling tty */ 78 79 uint16_t ac_len2; /* record length */ 80 union { 81 __dev_t ac_align; /* force v1 compatible alignment */ 82 83#define AFORK 0x01 /* forked but not exec'ed */ 84/* ASU is no longer supported */ 85#define ASU 0x02 /* used super-user permissions */ 86#define ACOMPAT 0x04 /* used compatibility mode */ 87#define ACORE 0x08 /* dumped core */ 88#define AXSIG 0x10 /* killed by a signal */ 89#define ANVER 0x20 /* new record version */ 90 91 uint8_t ac_flag; /* accounting flags */ 92 } ac_trailer; 93 94#define ac_flagx ac_trailer.ac_flag 95}; 96.Ed 97.Pp 98If a terminated process was created by an 99.Xr execve 2 , 100the name of the executed file (at most ten characters of it) 101is saved in the field 102.Fa ac_comm 103and its status is saved by setting one of more of the following flags in 104.Fa ac_flag : 105.Dv AFORK , 106.Dv ACOMPAT , 107.Dv ACORE 108and 109.Dv ASIG . 110.Dv ASU 111is no longer supported. 112.Dv ANVER 113is always set in the above structure. 114.Sh SEE ALSO 115.Xr lastcomm 1 , 116.Xr acct 2 , 117.Xr execve 2 , 118.Xr sa 8 119.Sh HISTORY 120A 121.Nm 122file format appeared in 123.At v7 . 124The current record format was introduced on May 2007. 125It is backwards compatible with the previous format, 126which is still documented in 127.In sys/acct.h 128and supported by 129.Xr lastcomm 1 130and 131.Xr sa 8 . 132