1IF_NAMETOINDEX(3P)         POSIX Programmer's Manual        IF_NAMETOINDEX(3P)
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PROLOG

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

12       if_nametoindex — map a network  interface  name  to  its  corresponding
13       index
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SYNOPSIS

16       #include <net/if.h>
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18       unsigned if_nametoindex(const char *ifname);
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DESCRIPTION

21       The  if_nametoindex()  function shall return the interface index corre‐
22       sponding to name ifname.
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RETURN VALUE

25       The corresponding index if ifname is the name of an  interface;  other‐
26       wise, zero.
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ERRORS

29       No errors are defined.
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31       The following sections are informative.
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EXAMPLES

34       None.
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APPLICATION USAGE

37       None.
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RATIONALE

40       None.
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FUTURE DIRECTIONS

43       None.
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SEE ALSO

46       getsockopt(),   if_freenameindex(),  if_indextoname(),  if_nameindex(),
47       setsockopt()
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49       The Base Definitions volume of POSIX.1‐2017, <net_if.h>
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52       Portions of this text are reprinted and reproduced in  electronic  form
53       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
54       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
55       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
56       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
57       event of any discrepancy between this version and the original IEEE and
58       The Open Group Standard, the original IEEE and The Open Group  Standard
59       is  the  referee document. The original Standard can be obtained online
60       at http://www.opengroup.org/unix/online.html .
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62       Any typographical or formatting errors that appear  in  this  page  are
63       most likely to have been introduced during the conversion of the source
64       files to man page format. To report such errors,  see  https://www.ker‐
65       nel.org/doc/man-pages/reporting_bugs.html .
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69IEEE/The Open Group                  2017                   IF_NAMETOINDEX(3P)
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