использовать локаль в текущем потоке (use locale in current thread)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
uselocale — use locale in current thread
Синопсис (Synopsis)
#include <locale.h>
locale_t uselocale(locale_t newloc);
Описание (Description)
The uselocale() function shall set or query the current locale
for the calling thread.
The value for the newloc argument shall be one of the following:
1. A value returned by the newlocale() or duplocale() functions
2. The special locale object descriptor LC_GLOBAL_LOCALE
3. (locale_t)0
If the newloc argument is (locale_t)0, the current locale shall
not be changed; this value can be used to query the current
locale setting. If the newloc argument is LC_GLOBAL_LOCALE, any
thread-local locale for the calling thread shall be uninstalled;
the thread shall again use the global locale as the current
locale, and changes to the global locale shall affect the thread.
Otherwise, the locale represented by newloc shall be installed as
a thread-local locale to be used as the current locale for the
calling thread.
Once the uselocale() function has been called to install a
thread-local locale, the behavior of every interface using data
from the current locale shall be affected for the calling thread.
The current locale for other threads shall remain unchanged.
Возвращаемое значение (Return value)
Upon successful completion, the uselocale() function shall return
a handle for the thread-local locale that was in use as the
current locale for the calling thread on entry to the function,
or LC_GLOBAL_LOCALE if no thread-local locale was in use.
Otherwise, uselocale() shall return (locale_t)0 and set errno to
indicate the error.
Ошибки (Error)
The uselocale() function may fail if:
EINVAL newloc is not a valid locale object and is not
(locale_t)0.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
Unlike the setlocale() function, the uselocale() function does
not allow replacing some locale categories only. Applications
that need to install a locale which differs only in a few
categories must use newlocale() to change a locale object
equivalent to the currently used locale and install it.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
duplocale(3p), freelocale(3p), newlocale(3p), setlocale(3p)
The Base Definitions volume of POSIX.1‐2017, locale.h(0p)
