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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() corresponds 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  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-11-27                SET_THREAD_AREA(2)