bionic (3) uselocale.3posix.gz

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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.


NAME
       uselocale — use locale in current thread


SYNOPSIS
       #include <locale.h>

       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:

        1. A value returned by the newlocale() or duplocale() functions

        2. The special locale object descriptor LC_GLOBAL_LOCALE

        3. (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() 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.

       The following sections are informative.


EXAMPLES
       None.


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.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       duplocale(), freelocale(), newlocale(), setlocale()

       The Base Definitions volume of POSIX.1‐2008, <locale.h>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event
       of any discrepancy between this version and the original IEEE and The Open Group Standard,  the  original
       IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at
       http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .