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IF_INDEXTONAME(P)		    POSIX Programmer's Manual			IF_INDEXTONAME(P)

NAME
       if_indextoname - map a network interface index to its corresponding name

SYNOPSIS
       #include <net/if.h>

       char *if_indextoname(unsigned ifindex, char *ifname);

DESCRIPTION
       The if_indextoname() function shall map an interface index to its corresponding name.

       When  this  function  is  called, ifname shall point to a buffer of at least {IF_NAMESIZE}
       bytes. The function shall place in this buffer  the  name  of  the  interface  with  index
       ifindex.

RETURN VALUE
       If  ifindex  is	an  interface index, then the function shall return the value supplied in
       ifname, which points to a buffer now containing the interface name. Otherwise,  the  func-
       tion shall return a NULL pointer and set errno to indicate the error.

ERRORS
       The if_indextoname() function shall fail if:

       ENXIO  The interface does not exist.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getsockopt() , if_freenameindex() , if_nameindex() , if_nametoindex() , setsockopt() , the
       Base Definitions volume of IEEE Std 1003.1-2001, <net/if.h>

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				IF_INDEXTONAME(P)
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