USELOCALE(3)               POSIX Programmer's Manual              USELOCALE(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.


NNAAMMEE
       uselocale -- use locale in current thread

SSYYNNOOPPSSIISS
       #include <locale.h>

       locale_t uselocale(locale_t _n_e_w_l_o_c);

DDEESSCCRRIIPPTTIIOONN
       The _u_s_e_l_o_c_a_l_e() function shall set the current locale for the current
       thread to the locale represented by _n_e_w_l_o_c.

       The value for the _n_e_w_l_o_c argument shall be one of the following:

        1. A value returned by the _n_e_w_l_o_c_a_l_e() or _d_u_p_l_o_c_a_l_e() functions

        2. The special locale object descriptor LC_GLOBAL_LOCALE

        3. (llooccaallee__tt)0

       Once the _u_s_e_l_o_c_a_l_e() function has been called to install a thread-local
       locale, the behavior of every interface using data from the current
       locale shall be affected for the calling thread. The current locale for
       other threads shall remain unchanged.

       If the _n_e_w_l_o_c argument is (llooccaallee__tt)0, the object returned is the
       current locale or LC_GLOBAL_LOCALE if there has been no previous call
       to _u_s_e_l_o_c_a_l_e() for the current thread.

       If the _n_e_w_l_o_c argument is LC_GLOBAL_LOCALE, the thread shall use the
       global locale determined by the _s_e_t_l_o_c_a_l_e() function.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, the _u_s_e_l_o_c_a_l_e() function shall return the
       locale handle from the previous call for the current thread, or
       LC_GLOBAL_LOCALE if there was no such previous call.  Otherwise,
       _u_s_e_l_o_c_a_l_e() shall return (llooccaallee__tt)0 and set _e_r_r_n_o to indicate the
       error.

EERRRROORRSS
       The _u_s_e_l_o_c_a_l_e() function may fail if:

       EEIINNVVAALL _l_o_c_a_l_e is not a valid locale object.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       Unlike the _s_e_t_l_o_c_a_l_e() function, the _u_s_e_l_o_c_a_l_e() function does not
       allow replacing some locale categories only. Applications that need to
       install a locale which differs only in a few categories must use
       _n_e_w_l_o_c_a_l_e() to change a locale object equivalent to the currently used
       locale and install it.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _d_u_p_l_o_c_a_l_e(), _f_r_e_e_l_o_c_a_l_e(), _n_e_w_l_o_c_a_l_e(), _s_e_t_l_o_c_a_l_e()

       The Base Definitions volume of POSIX.1-2008, <<llooccaallee..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2013                         USELOCALE(3)
