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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 POSIX.1-2008, <net_if.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                   IF_INDEXTONAME(3P)