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set_thread_area() - Unix, Linux System Call
set_thread_area - Set a Thread Local Storage (TLS) area
int set_thread_area (struct user_desc *u_info);
set_thread_area() sets an entry in the current threads 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 threads TLS array.
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.
set_thread_area() returns 0 on success, and -1 on failure, with
errno set appropriately.
u_info->entry_number is out of bounds.
u_info is an invalid pointer.
A free TLS entry could not be located.
set_thread_area() is Linux specific and should not be used in programs that are intended
to be portable.
A version of
set_thread_area() first appeared in Linux 2.5.29.