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SET_THREAD_AREA

Section: Linux Programmer's Manual (2)
Updated: 2008-11-27
Index Return to Main Contents

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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);  

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; call it using syscall(2).  

SEE ALSO

get_thread_area(2)  

COLOPHON

This page is part of release 3.35 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.

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Index

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

ERRORS

VERSIONS

CONFORMING TO

NOTES

SEE ALSO

COLOPHON

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