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swapon(2)							     swapon(2)

NAME
       swapon - Add a swap device for interleaved paging and swapping

SYNOPSIS
       int swapon(
	       char *pat,
	       int options,
	       int lowat,
	       int hiwat );

PARAMETERS
       Specifies  the block special device to be made available.  Specifies an
       option.	Only the MS_PREFER  option  is	currently  supported,  and  it
       causes  the  specified path to be the preferred paging device. (Ignored
       on Tru64 UNIX systems.)	Specifies the  low  water  mark.  (Ignored  on
       Tru64  UNIX systems.)  Specifies the high water mark. (Ignored on Tru64
       UNIX systems.)

DESCRIPTION
       The swapon() function makes a block special  device  available  to  the
       system for allocation of paging and swapping space. (The operating sys‐
       tem does not currently support paging and swapping to  a	 normal	 file.
       All swapping and paging areas must be block special devices.)

       The  calling process must have superuser privilege to call the swapon()
       function.

RETURN VALUES
       Upon successful completion, the swapon() function returns a value of  0
       (zero).	If  an	error has occurred, -1 is returned and errno is set to
       indicate the error.

ERRORS
       If the swapon() function fails, errno may be set to one of the  follow‐
       ing  values:  Search  permission	 is denied for a component of the path
       prefix.	The device specified by the path parameter  has	 already  been
       made  available	for  swapping.	 The path parameter points outside the
       process' allocated address space.  The pathname	contains  a  character
       with  the  high-order bit set, the device was not specified, the device
       configured by the path parameter was not configured into the system  as
       a  swap	device,	 or  the  device  does not allow paging.  An I/O error
       occurred while opening the swap device.	Too many symbolic  links  were
       encountered  in	translating  the  pathname.  A component of a pathname
       exceeded NAME_MAX characters, or an entire pathname  exceeded  PATH_MAX
       characters.   The named device does not exist.  A component of the path
       prefix is not a directory.  The major device number of the path parame‐
       ter  is	out of range. (This indicates that no device driver exists for
       the associated hardware.)  The caller does not have appropriate	privi‐
       lege.   An  attempt  was	 made to activate a paging file on a read-only
       file system.

SEE ALSO
       Commands: config(8), swapon(8)

								     swapon(2)

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