ACCT(5) | File Formats Manual | ACCT(5) |
acct
—
#include <sys/acct.h>
/* * 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 uint16_t comp_t; struct acct { char ac_comm[16]; /* 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 */ uint16_t ac_mem; /* memory usage average */ comp_t ac_io; /* count of IO blocks */ dev_t ac_tty; /* controlling tty */ #define AFORK 0x01 /* fork'd but not exec'd */ #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 */ uint8_t 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 void acct_init(void); int acct_process(struct lwp *); 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
, ACORE
, and
AXSIG
.
The ASU
flag is not recorded anymore
because with the switch to
kauth(9), the superuser model
is optional and passing the affected process to every authorization call in
order to record ASU
in
p_acflag, would require many source changes and would
not reflect reality because the authorization decision might not have been
done based on the
secmodel_suser(9)
model.
The ACOMPAT
flag was never recorded in
NetBSD; we could consider setting when the a process
is running under emulation, but this is not currently done.
Both the ASU
and the
ACOMPAT
flags are retained for source
compatibility.
acct
file format appeared in
Version 7 AT&T UNIX.
August 5, 2024 | NetBSD 9.4 |