NAME    [Toc]    [Back]

     swapon - add a swap device for interleaved paging/swapping

SYNOPSIS    [Toc]    [Back]

     #include <unistd.h>

     int
     swapon(const char *special);

DESCRIPTION    [Toc]    [Back]

     This interface is provided for compatibility only and has been obsoleted
     by swapctl(2).

     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 VALUES    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

     swapon() succeeds unless:

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

     [ENAMETOOLONG]
                   A component of a pathname exceeded {NAME_MAX} characters,
                   or an entire path name exceeded {PATH_MAX} 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.

SEE ALSO    [Toc]    [Back]

     swapctl(2), swapctl(8), swapon(8)

HISTORY    [Toc]    [Back]

     The swapon() function call appeared in 4.0BSD and was removed NetBSD 1.3

BUGS    [Toc]    [Back]

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

BSD                              June 4, 1993                              BSD