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 .