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)):
uselocale():
- Since glibc 2.10:
- _XOPEN_SOURCE >= 700
- Before glibc 2.10:
- _GNU_SOURCE
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).
On success,
uselocale() returns the locale handle that was set by the
previous call to
uselocale() in this thread, or
LC_GLOBAL_LOCALE
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
library.
POSIX.1-2008.
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)