acct(5) - NetBSD Manual Pages

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ACCT(5)                   NetBSD 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 exe- cuted 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 ASIG. The ASU and ACOMPAT flags are no longer recorded by the system, but are retained for source compatibility.
lastcomm(1), acct(2), execve(2), accton(8), sa(8)
A acct file format appeared in Version 7 AT&T UNIX. NetBSD 9.3 December 22, 2006 NetBSD 9.3
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