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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).