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NAME

       net/if.h - sockets local interfaces

SYNOPSIS

       #include <net/if.h>

DESCRIPTION

       The  <net/if.h>  header  shall  define  the if_nameindex structure that
       includes 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 macro 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.

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

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       The     System     Interfaces     volume    of    IEEE Std 1003.1-2001,
       if_freenameindex(), if_indextoname(), if_nameindex(), if_nametoindex()

COPYRIGHT

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 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 .