This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       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(7POSIX)

       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);

       Thefollowingsectionsareinformative.

       None.

       nl_types.h — data types

       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.

       None.

<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

       #include <nl_types.h>