acct man page on OpenBSD

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ACCT(5)			  OpenBSD Programmer's Manual		       ACCT(5)

     acct - execution accounting file

     #include <sys/acct.h>

     The kernel maintains the following acct information structure for all
     processes.	 If a process terminates, and accounting is enabled, the
     kernel 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
     executed 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.

OpenBSD 4.9		       November 1, 2010			   OpenBSD 4.9

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