acct man page on FreeBSD

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

NAME
     acct — execution accounting file

SYNOPSIS
     #include <sys/types.h>
     #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.

     #define AC_COMM_LEN 16

     /*
      * Accounting structure version 2 (current).
      * The first byte is always zero.
      * Time units are microseconds.
      */

     struct acctv2 {
	     uint8_t  ac_zero;		     /* zero identifies new version */
	     uint8_t  ac_version;	     /* record version number */
	     uint16_t ac_len;		     /* record length */

	     char      ac_comm[AC_COMM_LEN]; /* command name */
	     float     ac_utime;	     /* user time */
	     float     ac_stime;	     /* system time */
	     float     ac_etime;	     /* elapsed time */
	     time_t    ac_btime;	     /* starting time */
	     uid_t     ac_uid;		     /* user id */
	     gid_t     ac_gid;		     /* group id */
	     float     ac_mem;		     /* average memory usage */
	     float     ac_io;		     /* count of IO blocks */
	     __dev_t   ac_tty;		     /* controlling tty */

	     uint16_t ac_len2;		     /* record length */
	     union {
		     __dev_t   ac_align;     /* force v1 compatible alignment */

     #define AFORK   0x01		     /* forked but not exec'ed */
     /* ASU is no longer supported */
     #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 */
     #define ANVER   0x20		     /* new record version */

		     uint8_t  ac_flag;	     /* accounting flags */
	     } ac_trailer;

     #define ac_flagx ac_trailer.ac_flag
     };

     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, ACOMPAT, ACORE and ASIG.  ASU is no longer supported.
     ANVER is always set in the above structure.

SEE ALSO
     lastcomm(1), acct(2), execve(2), sa(8)

HISTORY
     A acct file format appeared in Version 7 AT&T UNIX.  The current record
     format was introduced on May 2007.	 It is backwards compatible with the
     previous format, which is still documented in <sys/acct.h> and supported
     by lastcomm(1) and sa(8).

BSD				 May 15, 2007				   BSD
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