SET_THREAD_AREA(2) Linux Programmer's Manual SET_THREAD_AREA(2)NAMEset_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);
DESCRIPTIONset_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 VALUEset_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.
CONFORMING TOset_thread_area() is Linux specific and should not be used in programs
that are intended to be portable.
VERSIONS
A version of set_thread_area() first appeared in Linux 2.5.29.
SEE ALSOget_thread_area(2).
Linux 2.5.29 2003-02-21 SET_THREAD_AREA(2)