1IF_NAMETOINDEX(P)          POSIX Programmer's Manual         IF_NAMETOINDEX(P)
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NAME

6       if_nametoindex  -  map  a  network  interface name to its corresponding
7       index
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SYNOPSIS

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

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

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

24       No errors are defined.
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26       The following sections are informative.
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EXAMPLES

29       None.
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APPLICATION USAGE

32       None.
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RATIONALE

35       None.
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FUTURE DIRECTIONS

38       None.
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SEE ALSO

41       getsockopt() , if_freenameindex() , if_indextoname() , if_nameindex() ,
42       setsockopt()  ,  the  Base  Definitions volume of IEEE Std 1003.1-2001,
43       <net/if.h>
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46       Portions of this text are reprinted and reproduced in  electronic  form
47       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
48       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
49       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
50       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
51       event of any discrepancy between this version and the original IEEE and
52       The Open Group Standard, the original IEEE and The Open Group  Standard
53       is  the  referee document. The original Standard can be obtained online
54       at http://www.opengroup.org/unix/online.html .
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58IEEE/The Open Group                  2003                    IF_NAMETOINDEX(P)
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