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       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.


       nl_types.h — data types


       #include <nl_types.h>


       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.









       The   System   Interfaces   volume  of  POSIX.1‐2008,  catclose(),  catgets(),  catopen(),

       The Shell and Utilities volume of POSIX.1‐2008, gencat


       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 .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
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