minix/lib/libc/sys/swapon.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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.\" $NetBSD: swapon.3,v 1.16 2010/05/31 12:16:20 njoly Exp $
.\"
.\" Copyright (c) 1980, 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. 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.
.\"
.\" @(#)swapon.2 8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt SWAPON 3
.Os
.Sh NAME
.Nm swapon
.Nd add a swap device for interleaved paging/swapping
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn swapon "const char *special"
.Sh DESCRIPTION
.Bf -symbolic
.\" This interface is available from the compatibility library, libcompat and
This interface is provided for compatibility only and
has been obsoleted by
.Xr swapctl 2 .
.Ef
.Pp
.Fn swapon
makes the block device
.Fa special
available to the system for
allocation for paging and swapping.
The names of potentially available devices are known to the system
and defined at system configuration time.
The size of the swap area on
.Fa special
is calculated at the time the device is first made available
for swapping.
.Sh RETURN VALUES
If an error has occurred, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn swapon
succeeds unless:
.Bl -tag -width ENAMETOOLONG
.It Bq Er ENOTDIR
A component of the path prefix is not a directory.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded
.Brq Dv NAME_MAX
characters, or an entire path name exceeded
.Brq Dv PATH_MAX
characters.
.It Bq Er ENOENT
The named device does not exist.
.It Bq Er EACCES
Search permission is denied for a component of the path prefix.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating the pathname.
.It Bq Er EPERM
The caller is not the super-user.
.It Bq Er ENOTBLK
.Fa special
is not a block device.
.It Bq Er EBUSY
The device specified by
.Fa special
has already
been made available for swapping
.It Bq Er EINVAL
The device configured by
.Fa special
was not
configured into the system as a swap device.
.It Bq Er ENXIO
The major device number of
.Fa special
is out of range (this indicates no device driver exists
for the associated hardware).
.It Bq Er EIO
An I/O error occurred while opening the swap device.
.It Bq Er EFAULT
.Fa special
points outside the process's allocated address space.
.El
.Sh SEE ALSO
.Xr swapctl 2 ,
.Xr swapctl 8 ,
.Xr swapon 8
.Sh HISTORY
The
.Fn swapon
function call appeared in
.Bx 4.0
and was removed
.Nx 1.3
.Sh BUGS
This call will be upgraded in future versions of the system.