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Linux 2.6 - man page for get_thread_area (linux section 2)

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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 appropri-
       ately.

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 3.55 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)
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