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

#### NAME

> net/if.h - sockets local interfaces

#### SYNOPSIS

> `#include <net/if.h>`

#### DESCRIPTION

> The <net/if.h> header shall define the if_nameindex structure, which shall include at least the following members:

>     unsigned  if_index  Numeric index of the interface.
>     char     *if_name   Null-terminated name of the interface.

> The <net/if.h> header shall define the following symbolic constant for the length of a buffer containing an interface name (including the terminating NULL character):

> IF_NAMESIZE
>   Interface name length.

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

>     void                  if_freenameindex(struct if_nameindex *);
>     char                 *if_indextoname(unsigned, char *);
>     struct if_nameindex  *if_nameindex(void);
>     unsigned              if_nametoindex(const char *);

The following sections are informative.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> XSH if_freenameindex, if_indextoname, if_nameindex, if_nametoindex

#### CHANGE HISTORY

> First released in Issue 6. Derived from the XNS, Issue 5.2 specification.

#### Issue 7

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

End of informative text.

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