uselocale man page on Gentoo

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

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

NAME
       uselocale — use locale in current thread

SYNOPSIS
       #include <locale.h>

       locale_t uselocale(locale_t newloc);

DESCRIPTION
       The uselocale() function shall set the current locale for  the  current
       thread to the locale represented by newloc.

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

	1. A value returned by the newlocale() or duplocale() functions

	2. The special locale object descriptor LC_GLOBAL_LOCALE

	3. (locale_t)0

       Once the uselocale() 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 newloc argument is (locale_t)0, the object returned is the  cur‐
       rent  locale  or LC_GLOBAL_LOCALE if there has been no previous call to
       uselocale() for the current thread.

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

RETURN VALUE
       Upon  successful	 completion, the uselocale() 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, uselo‐
       cale() shall return (locale_t)0 and set errno to indicate the error.

ERRORS
       The uselocale() function may fail if:

       EINVAL locale is not a valid locale object.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Unlike the setlocale() function,	 the  uselocale()  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 newlo‐
       cale()  to  change  a  locale  object  equivalent to the currently used
       locale and install it.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       duplocale(), freelocale(), newlocale(), setlocale()

       The Base Definitions volume of POSIX.1‐2008, <locale.h>

COPYRIGHT
       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 Electri‐
       cal 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.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			 USELOCALE(3P)
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