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+'\" et
+.TH USELOCALE "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH 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.
+
+.SH NAME
+uselocale
+\(em use locale in current thread
+.SH SYNOPSIS
+.LP
+.nf
+#include <locale.h>
+.P
+locale_t uselocale(locale_t \fInewloc\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIuselocale\fR()
+function shall set the current locale for the current thread to the
+locale represented by
+.IR newloc .
+.P
+The value for the
+.IR newloc
+argument shall be one of the following:
+.IP " 1." 4
+A value returned by the
+\fInewlocale\fR()
+or
+\fIduplocale\fR()
+functions
+.IP " 2." 4
+The special locale object descriptor LC_GLOBAL_LOCALE
+.IP " 3." 4
+(\c
+.BR locale_t )0
+.P
+Once the
+\fIuselocale\fR()
+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.
+.P
+If the
+.IR newloc
+argument is (\c
+.BR locale_t )0,
+the object returned is the current locale or LC_GLOBAL_LOCALE if there
+has been no previous call to
+\fIuselocale\fR()
+for the current thread.
+.P
+If the
+.IR newloc
+argument is LC_GLOBAL_LOCALE, the thread shall use the global locale
+determined by the
+\fIsetlocale\fR()
+function.
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fIuselocale\fR()
+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,
+\fIuselocale\fR()
+shall return (\c
+.BR locale_t )0
+and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIuselocale\fR()
+function may fail if:
+.TP
+.BR EINVAL
+.IR locale
+is not a valid locale object.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+Unlike the
+\fIsetlocale\fR()
+function, the
+\fIuselocale\fR()
+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
+\fInewlocale\fR()
+to change a locale object equivalent to the currently used locale and
+install it.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIduplocale\fR\^(\|)",
+.IR "\fIfreelocale\fR\^(\|)",
+.IR "\fInewlocale\fR\^(\|)",
+.IR "\fIsetlocale\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "\fB<locale.h>\fP"
+.SH COPYRIGHT
+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 .