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+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)acct.5	8.1 (Berkeley) 6/5/93
+.\"
+.Dd June 5, 1993
+.Dt ACCT 5
+.Os
+.Sh NAME
+.Nm acct
+.Nd execution accounting file
+.Sh SYNOPSIS
+.Fd #include <sys/acct.h>
+.Sh DESCRIPTION
+The kernel maintains the following
+.Fa acct
+information structure for all
+processes. If a process terminates, and accounting is enabled,
+the kernel calls the
+.Xr acct 2
+function call to prepare and append the record
+to the accounting file.
+.Bd -literal
+/*
+ * 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
+.Ed
+.Pp
+If a terminated process was created by an
+.Xr execve 2 ,
+the name of the executed file (at most ten characters of it)
+is saved in the field
+.Fa ac_comm
+and its status is saved by setting one of more of the following flags in
+.Fa ac_flag:
+.Dv AFORK ,
+.Dv ASU ,
+.Dv ACOMPAT ,
+.Dv ACORE
+and
+.Dv ASIG .
+.Sh SEE ALSO
+.Xr acct 2 ,
+.Xr execve 2 ,
+.Xr sa 8
+.Sh HISTORY
+A
+.Nm
+file format appeared in
+.At v7 .