1<net/if.h>(0P)             POSIX Programmer's Manual            <net/if.h>(0P)
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NAME

6       net/if.h - sockets local interfaces
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SYNOPSIS

9       #include <net/if.h>
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DESCRIPTION

12       The  <net/if.h>  header  shall  define  the if_nameindex structure that
13       includes at least the following members:
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16              unsigned  if_index  Numeric index of the interface.
17              char     *if_name   Null-terminated name of the interface.
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19       The <net/if.h> header shall define the following macro for  the  length
20       of  a  buffer  containing  an interface name (including the terminating
21       NULL character):
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23       IF_NAMESIZE
24              Interface name length.
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27       The following shall be declared as functions and may also be defined as
28       macros. Function prototypes shall be provided.
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31              unsigned              if_nametoindex(const char *);
32              char                 *if_indextoname(unsigned, char *);
33              struct if_nameindex  *if_nameindex(void);
34              void                  if_freenameindex(struct if_nameindex *);
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36       The following sections are informative.
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APPLICATION USAGE

39       None.
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RATIONALE

42       None.
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FUTURE DIRECTIONS

45       None.
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SEE ALSO

48       The  System  Interfaces  volume of IEEE Std 1003.1-2001, if_freenamein‐
49       dex(), if_indextoname(), if_nameindex(), if_nametoindex()
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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                       <net/if.h>(0P)
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