ACCT(5) MachTen Programmer’s Manual ACCT(5)

NAME
acct - execution accounting file

SYNOPSIS
#include <sys/acct.h>

DESCRIPTION
The kernel maintains the following acct information structure for all
processes. If a process terminates, and accounting is enabled, the kernel
calls the acct(2) function call to prepare and append the record to the
accounting file.

/*
* 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

If a terminated process was created by an execve(2), the name of the ex-
ecuted file (at most ten characters of it) is saved in the field ac_comm
and its status is saved by setting one of more of the following flags in
ac_flag: AFORK, ASU, ACOMPAT, ACORE and ASIG.