uselocale - set/get the locale for the calling thread


   #include <locale.h>

   locale_t uselocale(locale_t newloc);

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

       Since glibc 2.10:
              _XOPEN_SOURCE >= 700
       Before glibc 2.10:


   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

   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).


   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.


   EINVAL newloc does not refer to a valid locale object.


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




   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.


   See newlocale(3) and duplocale(3).


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


   This  page  is  part of release 4.09 of the Linux man-pages project.  A
   description of the project, information about reporting bugs,  and  the
   latest     version     of     this    page,    can    be    found    at


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