acct(4)
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acct File Format
per-process accounting file format
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SYNTAX
#include <sys/acct.h>
DESCRIPTION
Files produced as a result of calling acct(2) have records in the
form defined by <sys/acct.h>, whose contents are:
typedef ushort comp_t; /* "floating point" */
/* 13-bit fraction, 3-bit exponent */
struct acct
{
char ac_flag; /* Accounting flag */
char ac_stat; /* Exit status */
ushort ac_uid;
ushort ac_gid;
dev_t ac_tty;
time_t ac_btime; /* Beginning time */
comp_t ac_utime; /* acctng user time in clock ticks */
comp_t ac_stime; /* acctng system time in clock ticks */
comp_t ac_etime; /* acctng elapsed time in clock ticks */
comp_t ac_mem; /* memory usage in kbytes */
comp_t ac_io; /* chars trnsfrd by read/write */
comp_t ac_rw; /* number of block reads/writes */
char ac_comm[8]; /* command name */
};
Also defined are the following symbolic names:
AFORK
/* has executed fork, but no exec */
ASU /* used super-user privileges */
ACCTF
/* record type: 00 = acct */
In ac_flag, the AFORK flag is turned on by each fork(2) and
turned off by an exec(2). The ac_comm field is inherited from
the parent process and is reset by any exec. Each time the
system charges the process with a clock tick, it also adds to
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acct(4)
ac_mem the current process size, computed as follows:
(data size) + (text size) / (number of in-core processes
using text)
The value of ac_mem/(ac_stime+ac_utime) can be viewed as an
approximation to the mean process size, as modified by text-
sharing.
The structure tacct.h, which resides with the source files of the
accounting commands, represents the total accounting format used
by the various accounting commands:
/*
* total accounting (for acct period), also for day
*/
struct tacct {
uid_t ta_uid; /* userid */
char ta_name[8]; /* login name */
float ta_cpu[2]; /* cum. cpu time, p/np (mins) */
float ta_kcore[2]; /* cum kcore-minutes, p/np */
float ta_con[2]; /* cum. connect time, p/np, mins */
float ta_du; /* cum. disk usage */
long ta_pc; /* count of processes */
unsigned short ta_sc; /* count of login sessions */
unsigned short ta_dc; /* count of disk samples */
unsigned short ta_fee; /* fee for special services */
};
SEE ALSO
acct(2), exec(2), fork(2).
acct(1M) in the Administrator's Reference for the DG/UX System.
acctcom(1) in the User's Reference for the DG/UX System.
BUGS
The ac_mem value for a short-lived command gives little
information about the actual size of the command, because ac_mem
may be incremented while a different command (e.g., the shell) is
being executed by the process.
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