<net/if.h>(0P)                                      POSIX Programmer's Manual                                     <net/if.h>(0P)



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_nametoin-
       dex()

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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                <net/if.h>(0P)