uselocale - set/get the locale for the calling thread
locale_t uselocale(locale_t newloc);
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
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 error.
- A handle returned by a call to newlocale(3) or
- 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
- (locale_t) 0
- The calling thread's current locale is left unchanged (and the current
locale is returned as the function result).
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
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- newloc does not refer to a valid locale object.