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_HANDLE 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.

EXAMPLE

       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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       found at https://www.kernel.org/doc/man-pages/.