1IF_NAMEINDEX(3P) POSIX Programmer's Manual IF_NAMEINDEX(3P)
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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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12 if_nameindex — return all network interface names and indexes
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15 #include <net/if.h>
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17 struct if_nameindex *if_nameindex(void);
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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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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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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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42 None.
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45 None.
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48 None.
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51 None.
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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)