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SWAPON(2)		  FreeBSD System Calls Manual		     SWAPON(2)

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

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     swapon(const char *special);

DESCRIPTION
     Swapon() makes the	block device special available to the system for allo-
     cation 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 VALUES
     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.

     [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 translat-
			ing 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	asso-
			ciated hardware).

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

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

SEE ALSO
     config(8),	swapon(8)

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

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

HISTORY
     The swapon() function call	appeared in 4.0BSD.

FreeBSD	10.1			 June 4, 1993			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | BUGS | HISTORY

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