NetBSD/share/man/man5/acct.5

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.\" $NetBSD: acct.5,v 1.9 2006/12/22 08:00:20 ad Exp $
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.\" @(#)acct.5 8.1 (Berkeley) 6/5/93
.\"
.Dd December 22, 2006
.Dt ACCT 5
.Os
.Sh NAME
.Nm acct
.Nd execution accounting file
.Sh SYNOPSIS
.In sys/acct.h
.Sh DESCRIPTION
The kernel maintains the following
.Fa acct
information structure for all
processes. If a process terminates, and accounting is enabled,
the kernel calls the
.Xr acct 2
function call to prepare and append the record
to the accounting file.
.Bd -literal
/*
* Accounting structures; these use a comp_t type which is a 3 bits base 8
* exponent, 13 bit fraction ``floating point'' number. Units are 1/AHZ
* seconds.
*/
typedef u_short comp_t;
struct acct {
char ac_comm[10]; /* name of command */
comp_t ac_utime; /* user time */
comp_t ac_stime; /* system time */
comp_t ac_etime; /* elapsed time */
time_t ac_btime; /* starting time */
uid_t ac_uid; /* user id */
gid_t ac_gid; /* group id */
short ac_mem; /* memory usage average */
comp_t ac_io; /* count of IO blocks */
dev_t ac_tty; /* controlling tty */
#define AFORK 0x01 /* forked but not execed */
#define ASU 0x02 /* used super-user permissions */
#define ACOMPAT 0x04 /* used compatibility mode */
#define ACORE 0x08 /* dumped core */
#define AXSIG 0x10 /* killed by a signal */
char ac_flag; /* accounting flags */
};
/*
* 1/AHZ is the granularity of the data encoded in the comp_t fields.
* This is not necessarily equal to hz.
*/
#define AHZ 64
#ifdef KERNEL
struct vnode *acctp;
#endif
.Ed
.Pp
If a terminated process was created by an
.Xr execve 2 ,
the name of the executed file (at most ten characters of it)
is saved in the field
.Fa ac_comm
and its status is saved by setting one of more of the following flags in
.Fa ac_flag :
.Dv AFORK ,
.Dv ACORE
and
.Dv ASIG .
.Pp
The
.Dv ASU
and
.Dv ACOMPAT
flags are no longer recorded by the system, but are retained for source
compatibility.
.Sh SEE ALSO
.Xr lastcomm 1 ,
.Xr acct 2 ,
.Xr execve 2 ,
.Xr accton 8 ,
.Xr sa 8
.Sh HISTORY
A
.Nm
file format appeared in
.At v7 .