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.\" Copyright (C) 2008, Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.TH ACCT 5 2017-09-15 "Linux" "Linux Programmer's Manual"
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.SH NAME
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acct \- process accounting file
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.SH SYNOPSIS
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.B #include <sys/acct.h>
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.SH DESCRIPTION
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If the kernel is built with the process accounting option enabled
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.RB ( CONFIG_BSD_PROCESS_ACCT ),
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then calling
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.BR acct (2)
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starts process accounting, for example:
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.PP
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.in +4n
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acct("/var/log/pacct");
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.in
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.PP
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When process accounting is enabled, the kernel writes a record
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to the accounting file as each process on the system terminates.
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This record contains information about the terminated process,
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and is defined in
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.I <sys/acct.h>
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as follows:
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.PP
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.in +4n
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.EX
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#define ACCT_COMM 16
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typedef u_int16_t comp_t;
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struct acct {
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char ac_flag; /* Accounting flags */
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u_int16_t ac_uid; /* Accounting user ID */
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u_int16_t ac_gid; /* Accounting group ID */
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u_int16_t ac_tty; /* Controlling terminal */
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u_int32_t ac_btime; /* Process creation time
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(seconds since the Epoch) */
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comp_t ac_utime; /* User CPU time */
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comp_t ac_stime; /* System CPU time */
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comp_t ac_etime; /* Elapsed time */
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comp_t ac_mem; /* Average memory usage (kB) */
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comp_t ac_io; /* Characters transferred (unused) */
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comp_t ac_rw; /* Blocks read or written (unused) */
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comp_t ac_minflt; /* Minor page faults */
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comp_t ac_majflt; /* Major page faults */
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comp_t ac_swaps; /* Number of swaps (unused) */
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u_int32_t ac_exitcode; /* Process termination status
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(see wait(2)) */
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char ac_comm[ACCT_COMM+1];
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/* Command name (basename of last
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executed command; null-terminated) */
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char ac_pad[\fIX\fP]; /* padding bytes */
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};
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enum { /* Bits that may be set in ac_flag field */
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AFORK = 0x01, /* Has executed fork, but no exec */
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ASU = 0x02, /* Used superuser privileges */
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ACORE = 0x08, /* Dumped core */
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AXSIG = 0x10 /* Killed by a signal */
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};
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.EE
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.in
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.PP
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The
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.I comp_t
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data type is a floating-point value consisting of a 3-bit, base-8 exponent,
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and a 13-bit mantissa.
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A value,
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.IR c ,
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of this type can be converted to a (long) integer as follows:
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.PP
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.nf
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v = (c & 0x1fff) << (((c >> 13) & 0x7) * 3);
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.fi
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.PP
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The
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.IR ac_utime ,
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.IR ac_stime ,
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and
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.I ac_etime
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fields measure time in "clock ticks"; divide these values by
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.I sysconf(_SC_CLK_TCK)
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to convert them to seconds.
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.SS Version 3 accounting file format
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Since kernel 2.6.8,
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an optional alternative version of the accounting file can be produced
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if the
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.B CONFIG_BSD_PROCESS_ACCT_V3
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option is set when building the kernel.
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With this option is set,
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the records written to the accounting file contain additional fields,
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and the width of
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.I c_uid
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and
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.I ac_gid
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fields is widened from 16 to 32 bits
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(in line with the increased size of UID and GIDs in Linux 2.4 and later).
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The records are defined as follows:
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.PP
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.in +4n
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.EX
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struct acct_v3 {
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char ac_flag; /* Flags */
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char ac_version; /* Always set to ACCT_VERSION (3) */
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u_int16_t ac_tty; /* Controlling terminal */
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u_int32_t ac_exitcode; /* Process termination status */
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u_int32_t ac_uid; /* Real user ID */
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u_int32_t ac_gid; /* Real group ID */
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u_int32_t ac_pid; /* Process ID */
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u_int32_t ac_ppid; /* Parent process ID */
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u_int32_t ac_btime; /* Process creation time */
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float ac_etime; /* Elapsed time */
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comp_t ac_utime; /* User CPU time */
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comp_t ac_stime; /* System time */
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comp_t ac_mem; /* Average memory usage (kB) */
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comp_t ac_io; /* Characters transferred (unused) */
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comp_t ac_rw; /* Blocks read or written
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(unused) */
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comp_t ac_minflt; /* Minor page faults */
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comp_t ac_majflt; /* Major page faults */
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comp_t ac_swaps; /* Number of swaps (unused) */
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char ac_comm[ACCT_COMM]; /* Command name */
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};
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.EE
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.in
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.SH VERSIONS
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The
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.I acct_v3
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structure is defined in glibc since version 2.6.
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.SH CONFORMING TO
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Process accounting originated on BSD.
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Although it is present on most systems, it is not standardized,
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and the details vary somewhat between systems.
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.SH NOTES
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Records in the accounting file are ordered by termination time of
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the process.
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.PP
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In kernels up to and including 2.6.9,
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a separate accounting record is written for each thread created using
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the NPTL threading library;
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since Linux 2.6.10,
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a single accounting record is written for the entire process
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on termination of the last thread in the process.
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.PP
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The
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.I /proc/sys/kernel/acct
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file, described in
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.BR proc (5),
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defines settings that control the behavior of process accounting
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when disk space runs low.
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.SH SEE ALSO
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.BR lastcomm (1),
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.BR acct (2),
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.BR accton (8),
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.BR sa (8)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
|
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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