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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