get_thread_area(2) [linux man page]

GET_THREAD_AREA(2)					     Linux Programmer's Manual						GET_THREAD_AREA(2)

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);

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; call it using syscall(2).

SEE ALSO

       modify_ldt(2), set_thread_area(2)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-11-27							GET_THREAD_AREA(2)

SET_THREAD_AREA(2)					     Linux Programmer's Manual						SET_THREAD_AREA(2)

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 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-11-27							SET_THREAD_AREA(2)