apue_acct.h

typedef u_short comp_t; /* 3-bit base 8 exponent; 13-bit fraction */

struct acct
{
    char ac_flag; /* flag (see Figure 8.26) */
    char ac_stat; /* termination status (signal & core flag only) */
    /* (Solaris only) */
    uid_t ac_uid; /* real user ID */
    gid_t ac_gid; /* real group ID */
    dev_t ac_tty; /* controlling terminal */
    time_t ac_btime; /* starting calendar time */
    comp_t ac_utime; /* user CPU time */
    comp_t ac_stime; /* system CPU time */
    comp_t ac_etime; /* elapsed time */
    comp_t ac_mem; /* average memory usage */
    comp_t ac_io; /* bytes transferred (by read and write) */
    /* "blocks" on BSD systems */
    comp_t ac_rw; /* blocks read or written */
    /* (not present on BSD systems) */
    char ac_comm[8]; /* command name: [8] for Solaris, */
    /* [10] for Mac OS X, [16] for FreeBSD, and */
    /* [17] for Linux */
};