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high-order bit set", as this error is obsolete. Eventually we may want to add code to some of the "optional" filesystems (msdosfs, etc.) that checks for illegal characters. At that time it would be appropriate to reintroduce this error with appropriate text. Perhaps "The pathname contains a character that is not valid for filesystem type".
116 lines
3.9 KiB
Groff
116 lines
3.9 KiB
Groff
.\" Copyright (c) 1980, 1991 The Regents of the University of California.
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.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" from: @(#)swapon.2 6.7 (Berkeley) 3/10/91
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.\" $Id: swapon.2,v 1.6 1994/04/22 00:13:50 jtc Exp $
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.\"
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.Dd March 10, 1991
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.Dt SWAPON 2
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.Os BSD 4
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.Sh NAME
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.Nm swapon
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.Nd add a swap device for interleaved paging/swapping
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft int
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.Fn swapon "const char *special"
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.Sh DESCRIPTION
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.Fn Swapon
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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. 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. 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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.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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.Fn Swapon
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succeeds unless:
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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
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.Dv {NAME_MAX}
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characters, or an entire path name exceeded
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.Dv {PATH_MAX}
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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 ENOTBLK
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.Fa Special
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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 EINVAL
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The device configured by
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.Fa special
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was not
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configured into the system as a swap device.
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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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.It Bq Er EFAULT
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.Fa Special
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points outside the process's allocated address space.
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.Sh SEE ALSO
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.Xr swapon 8 ,
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.Xr config 8
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.Sh BUGS
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There is no way to stop swapping on a disk so that the pack may be
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dismounted.
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.Pp
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This call will be upgraded in future versions of the system.
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.Sh HISTORY
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The
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.Fn swapon
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function call appeared in
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.Bx 4.0 .
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