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SWAPON !!!SWAPON NAME SYNOPSIS DESCRIPTION PRIORITY RETURN VALUE ERRORS CONFORMING TO NOTES SEE ALSO ---- !!NAME swapon, swapoff - start/stop swapping to file/device !!SYNOPSIS __#include __ #include __ #include __ __int swapon(const char *__''path''__, int__ ''swapflags''__); int swapoff(const char *__''path''__);__ !!DESCRIPTION __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: ''(prio '' These functions may only be used by the super-user. !!PRIORITY 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-priority 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. !!RETURN VALUE On success, zero is returned. On error, -1 is returned, and ''errno'' is set appropriately. !!ERRORS 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. !!CONFORMING TO These functions are Linux specific and should not be used in programs intended to be portable. The second `swapflags' argument was introduced in Linux 1.3.2. !!NOTES The partition or path must be prepared with mkswap(8). !!SEE ALSO mkswap(8), swapon(8), swapoff(8) ----
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swapon(2)
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Man2s
swapon(8)
syscalls(2)
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