SET_THREAD_AREA(2) Linux Programmer's Manual SET_THREAD_AREA(2)
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 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.
set_thread_area() returns 0 on success, and -1 on failure, with errno set appropriately.
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.
A version of set_thread_area() first appeared in Linux 2.5.29.
set_thread_area() is Linux-specific and should not be used in programs that are intended to be portable.
Glibc does not provide a wrapper for this system call; call it using syscall(2).
This page is part of release 3.27 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)