The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### 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>

> XSH catclose, catgets, catopen, nl_langinfo

> XCU gencat

#### CHANGE HISTORY

> First released in Issue 2.

#### Issue 7

> The <nl_types.h> header is moved from the XSI option to the Base.

> This reference page is clarified with respect to macros and symbolic constants.

End of informative text.

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