net_if.h(0P)               POSIX Programmer's Manual              net_if.h(0P)

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
       net/if.h -- sockets local interfaces

SYNOPSIS
       #include <net/if.h>

DESCRIPTION
       The <net/if.h> header shall define the if_nameindex structure, which
       shall include at least the following members:


           unsigned  if_index  Numeric index of the interface.
           char     *if_name   Null-terminated name of the interface.

       The <net/if.h> header shall define the following symbolic constant for
       the length of a buffer containing an interface name (including the
       terminating NULL character):

       IF_NAMESIZE Interface name length.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.


           void                  if_freenameindex(struct if_nameindex *);
           char                 *if_indextoname(unsigned, char *);
           struct if_nameindex  *if_nameindex(void);
           unsigned              if_nametoindex(const char *);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of POSIX.1-2017, if_freenameindex(),
       if_indextoname(), if_nameindex(), if_nametoindex()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                         net_if.h(0P)