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<net/if.h>(P)			    POSIX Programmer's Manual			    <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 contain-
       ing 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_indexton-
       ame(), 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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