.\" Copyright (c) 1980 The Regents of the University of California. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms are permitted provided .\" that: (1) source distributions retain this entire copyright notice and .\" comment, and (2) distributions including binaries display the following .\" acknowledgement: ``This product includes software developed by the .\" University of California, Berkeley and its contributors'' in the .\" documentation or other materials provided with the distribution and in .\" all advertising materials mentioning features or use of this software. .\" 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. .\" .\" @(#)swapon.2 6.6 (Berkeley) 6/23/90 .\" .TH SWAPON 2 "June 23, 1990" .UC 4 .SH NAME swapon \- add a swap device for interleaved paging/swapping .SH SYNOPSIS .nf .B swapon(special) .B char *special; .fi .SH DESCRIPTION .I Swapon makes the block device .I 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 .I special is calculated at the time the device is first made available for swapping. .SH "RETURN VALUE If an error has occurred, a value of \-1 is returned and .I errno is set to indicate the error. .SH ERRORS .I Swapon succeeds unless: .TP 15 [ENOTDIR] A component of the path prefix is not a directory. .TP 15 [EINVAL] The pathname contains a character with the high-order bit set. .TP 15 [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. .TP 15 [ENOENT] The named device does not exist. .TP 15 [EACCES] Search permission is denied for a component of the path prefix. .TP 15 [ELOOP] Too many symbolic links were encountered in translating the pathname. .TP 15 [EPERM] The caller is not the super-user. .TP 15 [ENOTBLK] .I Special is not a block device. .TP 15 [EBUSY] The device specified by \fIspecial\fP has already been made available for swapping .TP 15 [EINVAL] The device configured by \fIspecial\fP was not configured into the system as a swap device. .TP 15 [ENXIO] The major device number of .I special is out of range (this indicates no device driver exists for the associated hardware). .TP 15 [EIO] An I/O error occurred while opening the swap device. .TP 15 [EFAULT] .I Special points outside the process's allocated address space. .SH "SEE ALSO" swapon(8), config(8) .SH BUGS There is no way to stop swapping on a disk so that the pack may be dismounted. .PP This call will be upgraded in future versions of the system.