1IF_NAMEINDEX(3P)           POSIX Programmer's Manual          IF_NAMEINDEX(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_nameindex — return all network interface names and indexes
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SYNOPSIS

16       #include <net/if.h>
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18       struct if_nameindex *if_nameindex(void);
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DESCRIPTION

21       The if_nameindex() function  shall  return  an  array  of  if_nameindex
22       structures,  one structure per interface. The end of the array is indi‐
23       cated by a structure with an if_index field  of  zero  and  an  if_name
24       field of NULL.
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26       Applications  should call if_freenameindex() to release the memory that
27       may be dynamically allocated by this function, after they have finished
28       using it.
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RETURN VALUE

31       An  array of structures identifying local interfaces. A null pointer is
32       returned upon an error, with errno set to indicate the error.
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ERRORS

35       The if_nameindex() function may fail if:
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37       ENOBUFS
38              Insufficient resources are available to complete the function.
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40       The following sections are informative.
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EXAMPLES

43       None.
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APPLICATION USAGE

46       None.
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RATIONALE

49       None.
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FUTURE DIRECTIONS

52       None.
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SEE ALSO

55       getsockopt(), if_freenameindex(),  if_indextoname(),  if_nametoindex(),
56       setsockopt()
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58       The Base Definitions volume of POSIX.1‐2008, <net_if.h>
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61       Portions  of  this text are reprinted and reproduced in electronic form
62       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
63       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
64       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
65       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
66       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
67       event of any discrepancy between this version and the original IEEE and
68       The Open Group Standard, the original IEEE and The Open Group  Standard
69       is  the  referee document. The original Standard can be obtained online
70       at http://www.unix.org/online.html .
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72       Any typographical or formatting errors that appear  in  this  page  are
73       most likely to have been introduced during the conversion of the source
74       files to man page format. To report such errors,  see  https://www.ker‐
75       nel.org/doc/man-pages/reporting_bugs.html .
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79IEEE/The Open Group                  2013                     IF_NAMEINDEX(3P)
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