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

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

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

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

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

30       No errors are defined.
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32       The following sections are informative.
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EXAMPLES

35       None.
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APPLICATION USAGE

38       None.
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RATIONALE

41       None.
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FUTURE DIRECTIONS

44       None.
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SEE ALSO

47       getsockopt(),   if_freenameindex(),  if_indextoname(),  if_nameindex(),
48       setsockopt()
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50       The Base Definitions volume of POSIX.1‐2008, <net_if.h>
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53       Portions of this text are reprinted and reproduced in  electronic  form
54       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
55       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
56       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
57       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
58       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
59       event of any discrepancy between this version and the original IEEE and
60       The  Open Group Standard, the original IEEE and The Open Group Standard
61       is the referee document. The original Standard can be  obtained  online
62       at http://www.unix.org/online.html .
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64       Any  typographical  or  formatting  errors that appear in this page are
65       most likely to have been introduced during the conversion of the source
66       files  to  man page format. To report such errors, see https://www.ker‐
67       nel.org/doc/man-pages/reporting_bugs.html .
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71IEEE/The Open Group                  2013                   IF_NAMETOINDEX(3P)
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