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

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(), the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
49       <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, 2003 Edition, Standard for Information Technology
54       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
55       Specifications Issue 6, Copyright (C) 2001-2003  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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64IEEE/The Open Group                  2003                   IF_NAMETOINDEX(3P)
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