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SWAPON(2)			    Linux Programmer's Manual				SWAPON(2)

       swapon, swapoff - start/stop swapping to file/device

       #include <unistd.h>
       #include <asm/page.h> /* to find PAGE_SIZE */
       #include <sys/swap.h>

       int swapon(const char *path, int swapflags);
       int swapoff(const char *path);

       swapon  sets  the  swap area to the file or block device specified by path.  swapoff stops
       swapping to the file or block device specified by path.

       swapon takes a swapflags argument.  If swapflags has the SWAP_FLAG_PREFER bit  turned  on,
       the new swap area will have a higher priority than default.  The priority is encoded as:


       These functions may only be used by the super-user.

       Each  swap  area has a priority, either high or low.  The default priority is low.  Within
       the low-priority areas, newer areas are even lower priority than older areas.

       All priorities set with swapflags are high-priority, higher than default.  They	may  have
       any non-negative value chosen by the caller.  Higher numbers mean higher priority.

       Swap  pages are allocated from areas in priority order, highest priority first.	For areas
       with different priorities, a higher-priority area is exhausted before using a lower-prior-
       ity  area.   If	two  or more areas have the same priority, and it is the highest priority
       available, pages are allocated on a round-robin basis between them.

       As of Linux 1.3.6, the kernel usually follows these rules, but there are exceptions.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

       Many other errors can occur if path is not valid.

       EPERM  The user is not the super-user, or more than MAX_SWAPFILES  (defined  to	be  8  in
	      Linux 1.3.6) are in use.

       EINVAL is returned if path exists, but is neither a regular path nor a block device.

       ENOENT is returned if path does not exist.

       ENOMEM is returned if there is insufficient memory to start swapping.

       These  functions are Linux specific and should not be used in programs intended to be por-
       table.  The second `swapflags' argument was introduced in Linux 1.3.2.

       The partition or path must be prepared with mkswap(8).

       mkswap(8), swapon(8), swapoff(8)

Linux 1.3.6				    1995-07-22					SWAPON(2)
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