NAME

       if_nameindex - return all network interface names and indexes

SYNOPSIS

       #include <net/if.h>

       struct if_nameindex *if_nameindex(void);

DESCRIPTION

       The  if_nameindex()  function  shall  return  an  array  of  if_nameindex  structures, one
       structure per interface. The end of the array is indicated by a structure with an if_index
       field of zero and an if_name field of NULL.

       Applications  should call if_freenameindex() to release the memory that may be dynamically
       allocated by this function, after they have finished using it.

RETURN VALUE

       An array of structures identifying local interfaces. A NULL pointer is  returned  upon  an
       error, with errno set to indicate the error.

ERRORS

       The if_nameindex() function may fail if:

       ENOBUFS
              Insufficient resources are available to complete the function.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       getsockopt()  ,  if_freenameindex() , if_indextoname() , 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 .