ACCT(5) BSD Programmer's Manual ACCT(5) NNAAMMEE aacccctt - execution accounting file SSYYNNOOPPSSIISS ##iinncclluuddee <<ssyyss//aacccctt..hh>> DDEESSCCRRIIPPTTIIOONN The kernel maintains the following _a_c_c_t 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_short comp_t; struct acct { char ac_comm[10]; /* name of command */ 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; /* memory usage average */ comp_t ac_io; /* count of IO blocks */ dev_t ac_tty; /* controlling tty */ #define AFORK 0x01 /* forked but not execed */ #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 #ifdef KERNEL struct vnode *acctp; #endif If a terminated process was created by an execve(2), the name of the ex- ecuted file (at most ten characters of it) is saved in the field _a_c___c_o_m_m and its status is saved by setting one of more of the following flags in _a_c___f_l_a_g_: AFORK, ASU, ACOMPAT, ACORE and ASIG. SSEEEE AALLSSOO acct(2), execve(2), sa(8) HHIISSTTOORRYY A aacccctt file format appeared in Version 7 AT&T UNIX. 4.4BSD June 5, 1993 1