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set_thread_area(2) [linux man page]

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 3.27 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 SET_THREAD_AREA(2)

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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 3.25 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 GET_THREAD_AREA(2)

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