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How to get system page size
The getpagesize function returns the number of bytes in a page. Page granularity is the granularity of many of the memory management calls. The page size is a system page size and may not be the same as the underlying hardware page size.
int retVal = 0;
retVal = getpagesize();
if( retVal >= 0)
printf("\n retVal = %d " retVal);