nl_types.h(0P)		   POSIX Programmer's Manual		nl_types.h(0P)

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
       nl_types.h — data types

SYNOPSIS
       #include <nl_types.h>

DESCRIPTION
       The <nl_types.h> header shall define at least the following types:

       nl_catd	     Used by the message catalog functions catopen(),
		     catgets(), and catclose() to identify a catalog
		     descriptor.

       nl_item	     Used by nl_langinfo() to identify items of langinfo data.
		     Values of objects of type nl_item are defined in
		     <langinfo.h>.

       The <nl_types.h> header shall define at least the following symbolic
       constants:

       NL_SETD	     Used by gencat when no $set directive is specified in a
		     message text source file. This constant can be passed as
		     the value of set_id on subsequent calls to catgets()
		     (that is, to retrieve messages from the default message
		     set). The value of NL_SETD is implementation-defined.

       NL_CAT_LOCALE Value that must be passed as the oflag argument to
		     catopen() to ensure that message catalog selection
		     depends on the LC_MESSAGES locale category, rather than
		     directly on the LANG environment variable.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.


	   int	     catclose(nl_catd);
	   char	    *catgets(nl_catd, int, int, const char *);
	   nl_catd   catopen(const char *, int);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <langinfo.h>

       The System Interfaces volume of POSIX.1‐2017, catclose(), catgets(),
       catopen(), nl_langinfo()

       The Shell and Utilities volume of POSIX.1‐2017, gencat

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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 .

IEEE/The Open Group		     2017			nl_types.h(0P)