swapon - Adds a swap device for interleaved paging and swapping
int hiwat );
path Specifies the block special device to be made available.
Specifies a flag. Only the MS_PREFER flag is currently supported, and
it causes the specified path to be the preferred paging device.
(Ignored on Tru64 UNIX.)
Specifies the low water mark. (Ignored on Tru64 UNIX.)
Specifies the high water mark. (Ignored on Tru64 UNIX.)
The swapon() function makes a block special device available to the system
for allocation of paging and swapping space. (The operating system does
not currently support paging and swapping to a normal file. All swapping
and pages areas must be block special devices.)
The calling process must have superuser privilege to call the swapon()
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 indi-
cate the error.
If the swapon() function fails, errno may be set to one of the following
[ENOTDIR] A component of the path prefix is not a directory.
[EINVAL] 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.
A component of a pathname exceeded NAME_MAX characters, or an
entire pathname 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 path-
[EPERM] The caller does not have appropriate privilege.
[EBUSY] The device specified by the path parameter has already been made
available for swapping.
[ENXIO] The major device number of the path parameter is out of range
(this indicates no device driver exists for the associated
[EIO] An I/O error occurred while opening the swap device.
[EFAULT] The path parameter points outside the process' allocated address
[EROFS] An attempt was made to activate a paging file on a read-only file
Commands: swapon(8), config(8)