NAME

       getpagesizes - Get the system supported huge page sizes

SYNOPSIS

       #include <hugetlbfs.h>

       int getpagesizes(long pagesizes[], int n_elem);

DESCRIPTION

       The  getpagesizes()  function  returns either the number of system supported page sizes or
       the sizes  themselves. If pagesizes is NULL and n_elem is 0, then the number of pages  the
       system  supports  is  returned.  Otherwise,  pagesizes  is filled with at most n_elem page
       sizes.

RETURN VALUE

       On success, either the number of page sizes supported by the system or the number of  page
       sizes  stored  in  pagesizes  is  returned.  On  failure,  -1 is returned and errno is set
       appropriately.

ERRORS

       EINVAL n_elem is less than zero or n_elem is greater than zero and pagesizes is NULL.

       Also see opendir(3) for other possible values for errno. This error occurs when the  sysfs
       directory exists but cannot be opened.

NOTES

       This  call  will  return all page sizes as reported by the kernel.  Not all of these sizes
       may be usable by the programmer since mount points may not be available for the huge  page
       sizes.     To    test    whether    a    size    will    be    usable   by   libhugetlbfs,
       hugetlbfs_find_path_for_size() can be called on a specific size to see if a mount point is
       configured.

SEE ALSO

       oprofile(1), opendir(3), gethugepagesizes(3), libhugetlbfs(7)

AUTHORS

       libhugetlbfs was written by various people on the libhugetlbfs-devel mailing list.

                                         October 10, 2008                         GETPAGESIZES(3)