#include <sys/mach_swapon.h> mach_swapon(file, flags, lowat, hiwat) char *file; unsigned int flags; int lowat; int hiwat;
Lowat specifies the low water mark for the file's size. If it is non-zero, pager will attempt to shrink the size of the file down to the low water mark as it frees paging resources. If it is zero, the file will never shrink. Hiwat specifies the high water mark for the file's size. If it is non-zero, the pager will not allow the paging file to grow above the high water mark. If it is zero, the file will grow as large as need be.
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