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IF_INDEXTONAME(P)          POSIX Programmer's Manual         IF_INDEXTONAME(P)

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(P)

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