NAME

       uselocale - set/get the locale for the calling thread

SYNOPSIS

       #include <locale.h>

       locale_t uselocale(locale_t newloc);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       uselocale():
           Since glibc 2.10:
                  _XOPEN_SOURCE >= 700
           Before glibc 2.10:
                  _GNU_SOURCE

DESCRIPTION

       The  uselocale()  function  sets  the  current  locale  for  the calling thread, and returns the thread's
       previously current locale.  After a successful call to uselocale(), any calls by this thread to functions
       that depend on the locale will operate as though the locale has been set to newloc.

       The newloc argument can have one of the following values:

       A handle returned by a call to newlocale(3) or duplocale(3)
              The calling thread's current locale is set to the specified locale.

       The special locale object handle LC_GLOBAL_LOCALE
              The calling thread's current locale is set to the global locale determined by setlocale(3).

       (locale_t) 0
              The calling thread's current locale is left unchanged (and the current locale is returned  as  the
              function result).

RETURN VALUE

       On  success,  uselocale()  returns  the locale handle that was set by the previous call to uselocale() in
       this thread, or LC_GLOBAL_LOCALE if there was no such previous call.  On error, it returns  (locale_t) 0,
       and sets errno to indicate the cause of the error.

ERRORS

       EINVAL newloc does not refer to a valid locale object.

VERSIONS

       The uselocale() function first appeared in version 2.3 of the GNU C library.

CONFORMING TO

       POSIX.1-2008.

NOTES

       Unlike  setlocale(3),  uselocale()  does not allow selective replacement of individual locale categories.
       To employ a locale that differs in  only  a  few  categories  from  the  current  locale,  use  calls  to
       duplocale(3)  and  newlocale(3) to obtain a locale object equivalent to the current locale and modify the
       desired categories in that object.

EXAMPLES

       See newlocale(3) and duplocale(3).

SEE ALSO

       locale(1), duplocale(3), freelocale(3), newlocale(3), setlocale(3), locale(5), locale(7)

COLOPHON

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Linux                                              2020-06-09                                       USELOCALE(3)