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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);
Note: There is no glibc wrapper for this system call; see NOTES.
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, since it is generally intended only
for use by threading libraries. In the unlikely event that you want to call it directly,
This page is part of release 3.53 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
Linux 2012-07-13 SET_THREAD_AREA(2)
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