7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
144 lines
4.0 KiB
Groff
144 lines
4.0 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)swapon.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd October 4, 2013
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.Dt SWAPON 2
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.Os
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.Sh NAME
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.Nm swapon , swapoff
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.Nd control devices for interleaved paging/swapping
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn swapon "const char *special"
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.Ft int
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.Fn swapoff "const char *special"
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.Sh DESCRIPTION
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The
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.Fn swapon
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system call
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makes the block device
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.Fa special
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available to the system for
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allocation for paging and swapping.
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The names of potentially
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available devices are known to the system and defined at system
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configuration time.
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The size of the swap area on
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.Fa special
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is calculated at the time the device is first made available
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for swapping.
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.Pp
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The
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.Fn swapoff
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system call disables paging and swapping on the given device.
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All associated swap metadata are deallocated, and the device
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is made available for other purposes.
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.Sh RETURN VALUES
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If an error has occurred, a value of -1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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Both
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.Fn swapon
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and
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.Fn swapoff
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can fail if:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1023 characters.
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.It Bq Er ENOENT
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The named device does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
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The caller is not the super-user.
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.It Bq Er EFAULT
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The
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.Fa special
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argument
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points outside the process's allocated address space.
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.El
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.Pp
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Additionally,
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.Fn swapon
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can fail for the following reasons:
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.Bl -tag -width Er
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.It Bq Er ENOTBLK
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The
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.Fa special
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argument
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is not a block device.
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.It Bq Er EBUSY
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The device specified by
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.Fa special
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has already
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been made available for swapping
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.It Bq Er ENXIO
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The major device number of
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.Fa special
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is out of range (this indicates no device driver exists
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for the associated hardware).
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.It Bq Er EIO
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An I/O error occurred while opening the swap device.
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.El
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.Pp
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Lastly,
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.Fn swapoff
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can fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The system is not currently swapping to
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.Fa special .
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.It Bq Er ENOMEM
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Not enough virtual memory is available to safely disable
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paging and swapping to the given device.
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.El
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.Sh SEE ALSO
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.Xr config 8 ,
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.Xr swapon 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Fn swapon
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system call appeared in
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.Bx 4.0 .
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The
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.Fn swapoff
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system call appeared in
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.Fx 5.0 .
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