ACCT(5) | File Formats Manual | ACCT(5) |
acct
— execution
accounting file
#include
<sys/acct.h>
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 executed
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
.
A acct
file format appeared in
Version 7 AT&T UNIX.
June 5, 1993 | macOS 14.6 |