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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.php .



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