if.h

<net/if.h>(P)							<net/if.h>(P)



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_freenamein-
       dex(), 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 Technol-
       ogy -- 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 .



POSIX				     2003			<net/if.h>(P)