NAME

       if_nametoindex - map a network interface name to its corresponding index

SYNOPSIS

       #include <net/if.h>

       unsigned if_nametoindex(const char *ifname);

DESCRIPTION

       The  if_nametoindex()  function  shall  return  the  interface index corresponding to name
       ifname.

RETURN VALUE

       The corresponding index if ifname is the name of an interface; otherwise, zero.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       getsockopt() , if_freenameindex() , if_indextoname() , if_nameindex() , 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 .