set_thread_area man page on Scientific

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

NAME
       set_thread_area - Set a Thread Local Storage (TLS) area

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

       int set_thread_area(struct user_desc *u_info);

DESCRIPTION
       set_thread_area()  sets	an  entry in the current thread's Thread Local
       Storage (TLS) array.  The TLS array entry set by set_thread_area() cor‐
       responds	 to  the  value of u_info->entry_number passed in by the user.
       If this value is in bounds, set_thread_area() copies the TLS descriptor
       pointed to by u_info into the thread's TLS array.

       When  set_thread_area() is passed an entry_number of -1, it uses a free
       TLS entry.  If set_thread_area() finds a free TLS entry, the  value  of
       u_info->entry_number  is	 set  upon  return  to	show  which  entry was
       changed.

RETURN VALUE
       set_thread_area() returns 0 on success, and -1 on failure,  with	 errno
       set appropriately.

ERRORS
       EINVAL u_info->entry_number is out of bounds.

       EFAULT u_info is an invalid pointer.

       ESRCH  A free TLS entry could not be located.

VERSIONS
       A version of set_thread_area() first appeared in Linux 2.5.29.

CONFORMING TO
       set_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  function;  call  it	 using
       syscall(2).

SEE ALSO
       get_thread_area(2)

COLOPHON
       This  page  is  part of release 3.22 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				  2008-11-27		    SET_THREAD_AREA(2)
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