IF_NAMEINDEX(3)            POSIX Programmer's Manual           IF_NAMEINDEX(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
       if_nameindex -- return all network interface names and indexes

SSYYNNOOPPSSIISS
       #include <net/if.h>

       struct if_nameindex *_i_f___n_a_m_e_i_n_d_e_x(void);

DDEESSCCRRIIPPTTIIOONN
       The _i_f___n_a_m_e_i_n_d_e_x() function shall return an array of _i_f___n_a_m_e_i_n_d_e_x
       structures, one structure per interface. The end of the array is
       indicated by a structure with an _i_f___i_n_d_e_x field of zero and an _i_f___n_a_m_e
       field of NULL.

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

RREETTUURRNN VVAALLUUEE
       An array of structures identifying local interfaces. A null pointer is
       returned upon an error, with _e_r_r_n_o set to indicate the error.

EERRRROORRSS
       The _i_f___n_a_m_e_i_n_d_e_x() function may fail if:

       EENNOOBBUUFFSS
              Insufficient resources are available to complete the function.

       _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_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _g_e_t_s_o_c_k_o_p_t(), _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_t_o_i_n_d_e_x(),
       _s_e_t_s_o_c_k_o_p_t()

       The Base Definitions volume of POSIX.1-2017, <<nneett__iiff..hh>>

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                      IF_NAMEINDEX(3)
