net_if.h(3)                POSIX Programmer's Manual               net_if.h(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       net/if.h -- sockets local interfaces

SSYYNNOOPPSSIISS
       #include <net/if.h>

DDEESSCCRRIIPPTTIIOONN
       The _<_n_e_t_/_i_f_._h_> header shall define the iiff__nnaammeeiinnddeexx 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 _<_n_e_t_/_i_f_._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 *);

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       The System Interfaces volume of POSIX.1-2017, _i_f___f_r_e_e_n_a_m_e_i_n_d_e_x(),
       _i_f___i_n_d_e_x_t_o_n_a_m_e(), _i_f___n_a_m_e_i_n_d_e_x(), _i_f___n_a_m_e_t_o_i_n_d_e_x()

CCOOPPYYRRIIGGHHTT
       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(3)
