Manpages - uselocale.3

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 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)

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