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 .