posix man page for uselocale

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 correspond-
       ing 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 current 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, uselocale() 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 newlocale() 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 Technol-
       ogy -- 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 Stan-
       dard 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(3P)