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IF_NAMETOINDEX(3P)         POSIX Programmer's Manual        IF_NAMETOINDEX(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
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 corre-
       sponding to name ifname.
RETURN VALUE
       The corresponding index if ifname is the name of an  interface;  other-
       wise, 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(3P)