trusty (3) if_indextoname.3posix.gz

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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>


       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 .