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

12       if_nameindex — return all network interface names and indexes
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SYNOPSIS

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

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

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

34       The if_nameindex() function may fail if:
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36       ENOBUFS
37              Insufficient resources are available to complete the function.
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39       The following sections are informative.
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EXAMPLES

42       None.
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APPLICATION USAGE

45       None.
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RATIONALE

48       None.
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FUTURE DIRECTIONS

51       None.
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SEE ALSO

54       getsockopt(), if_freenameindex(),  if_indextoname(),  if_nametoindex(),
55       setsockopt()
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57       The Base Definitions volume of POSIX.1‐2017, <net_if.h>
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60       Portions  of  this text are reprinted and reproduced in electronic form
61       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
62       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
63       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
64       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
65       event of any discrepancy between this version and the original IEEE and
66       The  Open Group Standard, the original IEEE and The Open Group Standard
67       is the referee document. The original Standard can be  obtained  online
68       at http://www.opengroup.org/unix/online.html .
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70       Any  typographical  or  formatting  errors that appear in this page are
71       most likely to have been introduced during the conversion of the source
72       files  to  man page format. To report such errors, see https://www.ker‐
73       nel.org/doc/man-pages/reporting_bugs.html .
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77IEEE/The Open Group                  2017                     IF_NAMEINDEX(3P)
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