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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);

Note: There is no glibc wrapper for this system call; see NOTES.

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 system call, since it is generally intended only for use by threading libraries. In the unlikely event that you want to call it directly, use syscall(2) .

See Also

get_thread_area(2)

Colophon

This page is part of release 3.78 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.

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