1IF_NAMETOINDEX(3P) POSIX Programmer's Manual IF_NAMETOINDEX(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_nametoindex — map a network interface name to its corresponding
13 index
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16 #include <net/if.h>
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18 unsigned if_nametoindex(const char *ifname);
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21 The if_nametoindex() function shall return the interface index corre‐
22 sponding to name ifname.
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25 The corresponding index if ifname is the name of an interface; other‐
26 wise, zero.
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29 No errors are defined.
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31 The following sections are informative.
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34 None.
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37 None.
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40 None.
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43 None.
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46 getsockopt(), if_freenameindex(), if_indextoname(), if_nameindex(),
47 setsockopt()
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49 The Base Definitions volume of POSIX.1‐2017, <net_if.h>
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52 Portions of this text are reprinted and reproduced in electronic form
53 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
54 table Operating System Interface (POSIX), The Open Group Base Specifi‐
55 cations Issue 7, 2018 Edition, Copyright (C) 2018 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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62 Any typographical or formatting errors that appear in this page are
63 most likely to have been introduced during the conversion of the source
64 files to man page format. To report such errors, see https://www.ker‐
65 nel.org/doc/man-pages/reporting_bugs.html .
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69IEEE/The Open Group 2017 IF_NAMETOINDEX(3P)