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     acct -- execution accounting file


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


     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;

     #define AC_COMM_LEN 16
     struct acct {
	     char    ac_comm[AC_COMM_LEN];  /* command name */
	     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;	     /* average memory usage */
	     comp_t  ac_io;	     /* count of IO blocks */
	     dev_t   ac_tty;	     /* controlling tty */
     #define AFORK   0x01	     /* forked but not exec'ed */
     #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

     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.


     acct(2), execve(2), sa(8)


     A acct file format appeared in Version 7 AT&T UNIX.


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