SWAPON(2)	    UNIX Programmer's Manual		SWAPON(2)


NAME
     swapon - add a swap device for interleaved paging/swapping

SYNOPSIS
     swapon(special)
     char *special;

DESCRIPTION
     Swapon makes the block device special available to the sys-
     tem 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 special is calculated at the time the device is
     first made available for swapping.

RETURN VALUE
     If an error has occurred, a value of -1 is returned and
     errno is set to indicate the error.

ERRORS
     Swapon succeeds unless:

     [ENOTDIR]	    A component of the path prefix is not a
		    directory.

     [EINVAL]	    The pathname contains a character with the
		    high-order bit set.

     [ENAMETOOLONG] A component of a pathname exceeded 255 char-
		    acters, or an entire path name exceeded 1023
		    characters.

     [ENOENT]	    The named device does not exist.

     [EACCES]	    Search permission is denied for a component
		    of the path prefix.

     [ELOOP]	    Too many symbolic links were encountered in
		    translating the pathname.

     [EPERM]	    The caller is not the super-user.

     [ENOTBLK]	    Special is not a block device.

     [EBUSY]	    The device specified by special has already
		    been made available for swapping

     [EINVAL]	    The device configured by special was not con-
		    figured into the system as a swap device.

     [ENXIO]	    The major device number of special is out of
		    range (this indicates no device driver exists


Printed 11/26/99	  March 9, 1986                         1


SWAPON(2)	    UNIX Programmer's Manual		SWAPON(2)


		    for the associated hardware).

     [EIO]	    An I/O error occurred while opening the swap
		    device.

     [EFAULT]	    Special points outside the process's allo-
		    cated address space.

SEE ALSO
     swapon(8), config(8)

BUGS
     There is no way to stop swapping on a disk so that the pack
     may be dismounted.

     This call will be upgraded in future versions of the system.


Printed 11/26/99	  March 9, 1986                         2


 
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