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+.\" Copyright (c) 1983, 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. 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.
+.\"
+.sh "System operation support
+.PP
+Unless noted otherwise,
+the calls in this section are permitted only to a privileged user.
+.NH 3
+Bootstrap operations
+.PP
+The call
+.DS
+mount(blkdev, dir, ronly);
+char *blkdev, *dir; int ronly;
+.DE
+extends the UNIX name space.  The \fImount\fP call specifies
+a block device \fIblkdev\fP containing a UNIX file system
+to be made available starting at \fIdir\fP.  If \fIronly\fP is
+set then the file system is read-only; writes to the file system
+will not be permitted and access times will not be updated
+when files are referenced.
+\fIDir\fP is normally a name in the root directory.
+.PP
+The call
+.DS
+swapon(blkdev, size);
+char *blkdev; int size;
+.DE
+specifies a device to be made available for paging and swapping.
+.PP
+.NH 3
+Shutdown operations
+.PP
+The call
+.DS
+unmount(dir);
+char *dir;
+.DE
+unmounts the file system mounted on \fIdir\fP.
+This call will succeed only if the file system is
+not currently being used.
+.PP
+The call
+.DS
+sync();
+.DE
+schedules input/output to clean all system buffer caches.
+(This call does not require privileged status.)
+.PP
+The call
+.DS
+reboot(how)
+int how;
+.DE
+causes a machine halt or reboot.  The call may request a reboot
+by specifying \fIhow\fP as RB_AUTOBOOT, or that the machine be halted
+with RB_HALT.  These constants are defined in \fI<sys/reboot.h>\fP.
+.NH 3
+Accounting
+.PP
+The system optionally keeps an accounting record in a file
+for each process that exits on the system.
+The format of this record is beyond the scope of this document.
+The accounting may be enabled to a file \fIname\fP by doing
+.DS
+acct(path);
+char *path;
+.DE
+If \fIpath\fP is null, then accounting is disabled.  Otherwise,
+the named file becomes the accounting file.