acct.h(3HEAD)							      Headers							     acct.h(3HEAD)

NAME

       acct.h, acct - per-process accounting file format

SYNOPSIS

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

DESCRIPTION

       Files produced as a result of calling acct(2) have records in the form defined by <sys/acct.h>, whose contents are:

	 typedef ushort_t  comp_t;   /* pseudo "floating point"
					representation */
				     /* 3 bit base-8 exponent in the high */
				     /* order bits, and a 13-bit fraction */
				     /* in the low order bits. */

	 struct    acct
	 {
	     char   ac_flag;	/* Accounting flag */
	     char   ac_stat;	/* Exit status */
	     uid_t  ac_uid;	/* Accounting user ID */
	     gid_t  ac_gid;	/* Accounting group ID */
	     dev_t  ac_tty;	/* control tty */
	     time_t ac_btime;	/* Beginning time */
	     comp_t ac_utime;	/* accounting user time in clock ticks */
	     comp_t ac_stime;	/* accounting system time in clock ticks */
	     comp_t ac_etime;	/* accounting total elapsed time in clock
				   ticks */
	     comp_t ac_mem;	/* memory usage in clicks (pages) */
	     comp_t ac_io;	/* chars transferred by read/write */
	     comp_t ac_rw;	/* number of block reads/writes */
	     char   ac_comm[8]; /* command name */
	 };

	 /*
	  * Accounting Flags
	  */

	 #define AFORK	 01    /* has executed fork, but no exec */
	 #define ASU	 02    /* used super-user privileges */
	 #define ACCTF	 0300  /* record type */
	 #define AEXPND  040   /* Expanded Record Type - default */

       In  ac_flag, the AFORK flag is turned on by each fork and turned off by an exec. The ac_comm field is inherited from the parent process and
       is reset by any exec. Each time the system charges the process with a clock tick, it also adds to ac_mem the current process size, computed
       as follows:

       (data size) + (text size) / (number of in-core processes using text)

       The value of ac_mem/(ac_stime+ac_utime) can be viewed as an approximation to the mean process size, as modified by text sharing.

       The  structure  tacct,  (which resides with the source files of the accounting commands), represents a summary of accounting statistics for
       the user id ta_uid. This structure is used by the accounting commands to report	statistics based on user id.

	 /*
	  *  total accounting (for acct period), also for day
	  */
	 struct tacct {
	    uid_t	    ta_uid;	  /* user id */
	    char	    ta_name[8];   /* login name */
	    float	    ta_cpu[2];	  /* cum. cpu time in minutes, */
					  /* p/np (prime/non-prime time) */
	    float	    ta_kcore[2];  /* cum. kcore-minutes, p/np */
	    float	    ta_con[2];	  /* cum. connect time in minutes,
					      p/np */
	    float	    ta_du;	  /* cum. disk usage (blocks)*/
	    long	    ta_pc;	  /* count of processes */
	    unsigned short  ta_sc;	  /* count of login sessions */
	    unsigned short  ta_dc;	  /* count of disk samples */
	    unsigned short  ta_fee;	  /* fee for special services */
	 };

       The ta_cpu, ta_kcore, and ta_con members contain usage information pertaining to prime time and non-prime time hours.  The first element in
       each  array  represents the time the  resource was used during prime time hours.  The second element in	each array represents the time the
       resource was used during non-prime time hours.  Prime time and non-prime time hours may be set in the  holidays file (see holidays(4)).

       The ta_kcore member is a cumulative measure of the amount of memory used  over the accounting period by processes owned by  the	user  with
       uid ta_uid. The amount shown represents kilobyte segments of memory used, per minute.

       The ta_con member represents the amount of time the user was logged in to the system.

FILES

       /etc/acct/holidays    prime/non-prime time table

SEE ALSO

       acctcom(1), acct(1M), acctcon(1M), acctmerg(1M), acctprc(1M), acctsh(1M), prtacct(1M), runacct(1M), shutacct(1M), acct(2), exec(2), fork(2)

NOTES

       The ac_mem value for a short-lived command gives little information about the actual size of the command, because ac_mem may be incremented
       while a different command (for example, the shell) is being executed by the process.

SunOS 5.11							    19 May 1994 						     acct.h(3HEAD)