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IF_NAMEINDEX(3P)           POSIX Programmer's Manual          IF_NAMEINDEX(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_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 indi-
       cated 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 .

IEEE/The Open Group                  2003                     IF_NAMEINDEX(3P)
 

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