gethugepagesizes - Get the system supported huge page sizes

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

                                                October 10, 2008                             GETHUGEPAGESIZES(3)

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

EINVALn_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.

       gethugepagesizes - Get the system supported huge page sizes

       This call will return all huge 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 all 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.

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

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

#include<hugetlbfs.h>

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