NAME
uselocale — use
locale in current thread
SYNOPSIS
locale_t uselocale(locale_t newloc);
DESCRIPTION
The uselocale () function shall set the
current locale for the current thread to the locale represented by
newloc.
The value for the newloc argument shall be one of the following:
- A value returned by the newlocale(3) or duplocale(3) functions
- The special locale object descriptor LC_GLOBAL_LOCALE
- ( locale_t) 0
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.
If the newloc argument is (
locale_t) 0, the object returned is the current locale or
LC_GLOBAL_LOCALE if there has been no previous call to
uselocale () for the current thread.
If the newloc argument is LC_GLOBAL_LOCALE, the thread shall use the global locale determined by the setlocale(3) function.
RETURN VALUE
Upon successful completion, the uselocale
() function shall return the locale handle from the previous call for the
current thread, or LC_GLOBAL_LOCALE if there was no such previous call.
Otherwise, uselocale () shall return (
locale_t) 0 and set
errno to
indicate the error.
ERRORS
The uselocale () function may fail if:
- [EINVAL]
- locale is not a valid locale object.
EXAMPLES
None.
APPLICATION USAGE
Unlike the setlocale(3) 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(3) to
change a locale object equivalent to the currently used locale and install
it.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
duplocale(3), freelocale(3), newlocale(3), setlocale(3)
XBD <locale.h>
CHANGE HISTORY
First released in Issue 7.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0700 [290] and XSH/TC1-2008/0701 [334] are applied.