centos man page for get_thread_area

GET_THREAD_AREA(2)					     Linux Programmer's Manual						GET_THREAD_AREA(2)

NAME
       get_thread_area - get a thread-local storage (TLS) area

SYNOPSIS
       #include <linux/unistd.h>
       #include <asm/ldt.h>

       int get_thread_area(struct user_desc *u_info);

       Note: There is no glibc wrapper for this system call; see NOTES.

DESCRIPTION
       get_thread_area()  returns  an  entry  in the current thread's thread-local storage (TLS) array.  The index of the entry corresponds to the
       value of u_info->entry_number, passed in by the user.  If the value is in bounds, get_thread_area() copies the corresponding TLS entry into
       the area pointed to by u_info.

RETURN VALUE
       get_thread_area() returns 0 on success.	Otherwise, it returns -1 and sets errno appropriately.

ERRORS
       EFAULT u_info is an invalid pointer.

       EINVAL u_info->entry_number is out of bounds.

VERSIONS
       A version of get_thread_area() first appeared in Linux 2.5.32.

CONFORMING TO
       get_thread_area() is Linux-specific and should not be used in programs that are intended to be portable.

NOTES
       Glibc does not provide a wrapper for this system call, since it is generally intended for use only by threading libraries.  In the unlikely
       event that you want to call it directly, use syscall(2).

SEE ALSO
       modify_ldt(2), set_thread_area(2)

COLOPHON
       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2012-07-13							GET_THREAD_AREA(2)