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

     acct -- execution accounting file

     #include <&lt;sys/acct.h>&gt;

     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_int16_t comp_t;

     struct acct {
             char      ac_comm[10];  /* 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 */
             u_int16_t ac_mem;       /* average memory usage */
             comp_t    ac_io;        /* count of IO blocks */
             dev_t     ac_tty;       /* controlling tty */

     #define AFORK   0x01            /* fork'd but not exec'd */
     #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 */
             u_int8_t  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
     int     acct_process(struct proc *p);

     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 or more of the following flags in
     ac_flag: AFORK, ASU, ACOMPAT, ACORE, and AXSIG.

     lastcomm(1), acct(2), execve(2), accton(8), sa(8)

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

BSD                            November 15, 2014                           BSD