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
       function 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
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .