get_thread_area(2) - Linux man page

Name

get_thread_area - get a thread-local storage (TLS) area

Synopsis

#include <linux/unistd.h>
#include <asm/ldt.h>

int get_thread_area(struct user_desc *u_info);

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

Description

get_thread_area() returns an entry in the current thread's thread-local storage (TLS) array. The index of the entry corresponds to the value of u_info->entry_number, passed in by the user. If the value is in bounds, get_thread_area() copies the corresponding TLS entry into the area pointed to by u_info.

Return Value

get_thread_area() returns 0 on success. Otherwise, it returns -1 and sets errno appropriately.

Errors

EFAULT: u_info is an invalid pointer.
EINVAL: u_info->entry_number is out of bounds.

Versions

A version of get_thread_area() first appeared in Linux 2.5.32.

Conforming to

get_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).