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CentOS 7.0 - man page for gethugepagesizes (centos section 3)

GETHUGEPAGESIZES(3)		     Library Functions Manual		      GETHUGEPAGESIZES(3)

NAME
       gethugepagesizes - Get the system supported huge page sizes

SYNOPSIS
       #include <hugetlbfs.h>

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

DESCRIPTION
       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.

RETURN VALUE
       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.

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 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.

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

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

					 October 10, 2008		      GETHUGEPAGESIZES(3)


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