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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 dif-
       fer (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 corresponding 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)