1net_if.h(0P)               POSIX Programmer's Manual              net_if.h(0P)
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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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11

NAME

13       net/if.h — sockets local interfaces
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SYNOPSIS

16       #include <net/if.h>
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DESCRIPTION

19       The <net/if.h> header shall define the  if_nameindex  structure,  which
20       shall include at least the following members:
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22           unsigned  if_index  Numeric index of the interface.
23           char     *if_name   Null-terminated name of the interface.
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25       The  <net/if.h> header shall define the following symbolic constant for
26       the length of a buffer containing an interface name (including the ter‐
27       minating NULL character):
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29       IF_NAMESIZE Interface name length.
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31       The following shall be declared as functions and may also be defined as
32       macros. Function prototypes shall be provided.
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34           void                  if_freenameindex(struct if_nameindex *);
35           char                 *if_indextoname(unsigned, char *);
36           struct if_nameindex  *if_nameindex(void);
37           unsigned              if_nametoindex(const char *);
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39       The following sections are informative.
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APPLICATION USAGE

42       None.
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RATIONALE

45       None.
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FUTURE DIRECTIONS

48       None.
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SEE ALSO

51       The  System  Interfaces  volume  of  POSIX.1‐2008,  if_freenameindex(),
52       if_indextoname(), if_nameindex(), if_nametoindex()
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55       Portions  of  this text are reprinted and reproduced in electronic form
56       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
57       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
58       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
59       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
60       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
61       event of any discrepancy between this version and the original IEEE and
62       The Open Group Standard, the original IEEE and The Open Group  Standard
63       is  the  referee document. The original Standard can be obtained online
64       at http://www.unix.org/online.html .
65
66       Any typographical or formatting errors that appear  in  this  page  are
67       most likely to have been introduced during the conversion of the source
68       files to man page format. To report such errors,  see  https://www.ker‐
69       nel.org/doc/man-pages/reporting_bugs.html .
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73IEEE/The Open Group                  2013                         net_if.h(0P)
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