| Member Name | Type | Description |
| ac_flag | char | Special flags showing process behaviors |
| ac_uid | u_int16_t | User ID of the process |
| ac_gid | u_int16_t | Group ID of the process |
| ac_tty | u_int16_t | Controlling terminal of the process |
| ac_btime | u_int_32_t | Process start time |
| ac_utime | comp_t | User time |
| ac_stime | comp_t | System time |
| ac_etime | comp_t | Elapsed time |
| ac_mem | comp_t | Average memory usage |
| ac_io | comp_t | Characters transferred |
| ac_rw | comp_t | Blocks read or written |
| ac_minflt | comp_t | Minor pagefaults |
| ac_majflt | comp_t | Major pagefaults |
| ac_swaps | comp_t | Number of swaps |
| ac_exitcode | u_int32_t | Process exitcode |
| ac_comm | char[] | First 16 characters of command name |
| ac_pad | char[] | Padding bytes |