IF_INDEXTONAME(3)          POSIX Programmer's Manual         IF_INDEXTONAME(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_indextoname -- map a network interface index to its corresponding
       name

SSYYNNOOPPSSIISS
       #include <net/if.h>

       char *if_indextoname(unsigned _i_f_i_n_d_e_x, char *_i_f_n_a_m_e);

DDEESSCCRRIIPPTTIIOONN
       The _i_f___i_n_d_e_x_t_o_n_a_m_e() function shall map an interface index to its
       corresponding name.

       When this function is called, _i_f_n_a_m_e shall point to a buffer of at
       least {IF_NAMESIZE} bytes. The function shall place in this buffer the
       name of the interface with index _i_f_i_n_d_e_x.

RREETTUURRNN VVAALLUUEE
       If _i_f_i_n_d_e_x is an interface index, then the function shall return the
       value supplied in _i_f_n_a_m_e, which points to a buffer now containing the
       interface name. Otherwise, the function shall return a null pointer and
       set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       The _i_f___i_n_d_e_x_t_o_n_a_m_e() function shall fail if:

       EENNXXIIOO  The interface does not exist.

       _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___n_a_m_e_i_n_d_e_x(), _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_INDEXTONAME(3)
