Gets the system page size.

    Format

      #include  <unistd.h>

      int getpagesize  (void);

1 - Description

    The getpagesize function returns the number of bytes in a page.
    The system page size is useful for specifying arguments to memory
    management system calls.

    The page size is a system page size and is not necessarily the
    same as the underlying hardware page size.

2 - Return Value

    x                  Always indicates success. Returns the number
                       of bytes in a page.