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IF_INDEXTONAME(3P)         POSIX Programmer's Manual        IF_INDEXTONAME(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_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 cor-
       responding 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 .

IEEE/The Open Group                  2003                   IF_INDEXTONAME(3P)