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CentOS 7.0 - man page for get_thread_area (centos section 2)

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)