2011-11-20 14:45:42 +00:00
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.\" Copyright (c) 2011 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This documentation was written by David Chisnall under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 17 2011
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.Dt DUPLOCALE 3
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.Os
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.Sh NAME
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.Nm duplocale
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.Nd duplicate an locale
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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2011-12-02 11:55:09 +00:00
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.In xlocale.h
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.Ft locale_t
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.Fn duplocale "locale_t locale"
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.Sh DESCRIPTION
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Duplicates an existing
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.Fa locale_t
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returning a new
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.Fa locale_t
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that refers to the same locale values but has independent internal state.
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Various functions, such as
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.Xr mblen 3
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2011-12-02 11:55:09 +00:00
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require presistent state.
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These functions formerly used static variables and calls to them from multiple
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threads had undefined behavior.
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They now use fields in the
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.Fa locale_t
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associated with the current thread by
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.Xr uselocale 3 .
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These calls are therefore only thread safe on threads with a unique per-thread
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locale.
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.Pt
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The locale returned by this call must be freed with
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.Xr freelocale 3 .
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.Sh BUGS
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Ideally,
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.Xr uselocale 3
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should make a copy of the
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.Fa locale_t
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2011-12-02 11:55:09 +00:00
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implicitly to ensure thread safety,
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and a copy of the global locale should be installed lazily on each thread.
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The FreeBSD implementation does not do this,
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2011-11-20 14:45:42 +00:00
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for compatibility with Darwin.
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.Sh SEE ALSO
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.Xr freelocale 3 ,
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.Xr localeconv 3 ,
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.Xr newlocale 3 ,
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.Xr querylocale 3 ,
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.Xr uselocale 3 ,
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.Xr xlocale 3
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.Sh STANDARDS
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This function, conforms to
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.St -p1003.1-2008
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