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acct(5) [netbsd man page]

ACCT(5) 						      BSD File Formats Manual							   ACCT(5)

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 ker- nel 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, ACORE and ASIG. The ASU and ACOMPAT flags are no longer recorded by the system, but are retained for source compatibility. SEE ALSO
lastcomm(1), acct(2), execve(2), accton(8), sa(8) HISTORY
A acct file format appeared in Version 7 AT&T UNIX. BSD
December 22, 2006 BSD

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acct(4) 						     Kernel Interfaces Manual							   acct(4)

acct - per-process accounting file format SYNOPSIS
Files produced as a result of calling (see acct(2)) have records in the form defined by 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 */ uid_t ac_uid; /* Accounting user ID */ gid_t ac_gid; /* Accounting group ID */ dev_t ac_tty; /* control typewriter */ 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 clicks */ comp_t ac_io; /* chars trnsfrd by read/write */ comp_t ac_rw; /* number of block reads/writes */ char ac_comm[8]; /* command name */ }; #define AFORK 01 /* has executed fork, but no exec */ #define ASU 02 /* used super-user privileges */ #define ACCTF 0300 /* record type: 00 = acct */ In the flag is turned on by each and turned off by an (see fork(2) and exec(2)). The field is inherited from the parent process and is reset by any Each time the system charges the process with a clock tick, it also adds to the current process size, computed as follows: (data size) + (text size) + (number of in-core processes sharing text) + sum of ((shared memory segment size) / (number of in-core processes attached to segment)) For systems with virtual memory, the text, data, and shared memory sizes refer to the resident portion of the memory segments. The value of can be viewed as an approximation to the mean process size, as modified by text-sharing. The structure, which resides with the source files of the accounting commands, represents the total accounting format used by the various accounting commands: WARNINGS
The value for a short-lived command gives little information about the actual size of the command because can be incremented while a dif- ferent command (such as the shell) is being executed by the process. Kernel internal structures may change from release to release without warning. Applications directly relying on these structures are not supported. Accounting files are currently written in 32-bit format. Thus, 64-bit applications which read the files need to make special provisions. In particular, the header declares the field as rather than a in 64-bit compilations. The field should be cast to in the application before using it (e.g., in calls to date conversion functions). The accounting file format will be changed to a 64-bit layout at a future release. SEE ALSO
acct(2), acct(1M), acctcom(1M), exec(2), fork(2). STANDARDS CONFORMANCE
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