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 .

IEEE/The Open Group                                   2003                                     IF_NAMETOINDEX(P)