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USELOCALE(3)               Linux Programmer's Manual              USELOCALE(3)
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  duplo-
       cale(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
       This  page  is  part of release 4.15 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
       https://www.kernel.org/doc/man-pages/.
Linux                             2017-09-15                      USELOCALE(3)