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SWAPON(2)							     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 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 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 characters, 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 configured into
		      the system as a swap device.

       [ENXIO]	      The major device number of special is out of range (this
		      indicates	 no  device  driver  exists for the associated
		      hardware).

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

       [EFAULT]	      Special points outside the process's  allocated  address
		      space.

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.

4th Berkeley Distribution	 March 9, 1986			     SWAPON(2)

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