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swapon(2)							     swapon(2)

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

Syntax
       swapon(special)
       char *special;

Description
       The  system call 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 config‐
       uration time.  The size of the swap area on special  is	calculated  at
       the time the device is first made available for swapping.

Restrictions
       There is no way to stop swapping on a disk so that the pack may be dis‐
       mounted.

Diagnostics
       The system call succeeds unless:

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

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an
		      entire pathname 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]      The 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 that no device  driver  exists  for  the
		      associated hardware.)

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

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

See Also
       config(8), swapon(8)

								     swapon(2)

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