182 lines
3.8 KiB
HTML
182 lines
3.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of IF_NAMETOINDEX</TITLE>
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</HEAD><BODY>
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<H1>IF_NAMETOINDEX</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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if_nametoindex, if_indextoname - mappings between network interface
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names and indexes
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/net/if.h">net/if.h</A>></B>
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<B>unsigned int if_nametoindex(const char *</B><I>ifname</I><B>);</B>
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<B>char *if_indextoname(unsigned int ifindex, char *</B><I>ifname</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>if_nametoindex</B>()
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function returns the index of the network interface
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corresponding to the name
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<I>ifname</I>.
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<P>
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The
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<B>if_indextoname</B>()
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function returns the name of the network interface
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corresponding to the interface index
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<I>ifindex</I>.
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The name is placed in the buffer pointed to by
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<I>ifname</I>.
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The buffer must allow for the storage of at least
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<B>IF_NAMESIZE</B>
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bytes.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>if_nametoindex</B>()
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returns the index number of the network interface;
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on error, 0 is returned and
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<I>errno</I>
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is set appropriately.
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<P>
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On success,
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<B>if_indextoname</B>()
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returns
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<I>ifname</I>;
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on error, NULL is returned and
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<I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<B>if_nametoindex</B>()
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may fail and set
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<I>errno</I>
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if:
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<DL COMPACT>
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<DT id="1"><B>ENODEV</B>
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<DD>
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No interface found with given name.
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</DL>
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<P>
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<B>if_indextoname</B>()
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may fail and set
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<I>errno</I>
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if:
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<DL COMPACT>
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<DT id="2"><B>ENXIO</B>
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<DD>
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No interface found for the index.
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</DL>
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<P>
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<B>if_nametoindex</B>()
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and
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<B>if_indextoname</B>()
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may also fail for any of the errors specified for
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<B><A HREF="/cgi-bin/man/man2html?2+socket">socket</A></B>(2)
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or
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2).
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<A NAME="lbAG"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>if_nametoindex</B>(),
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<B>if_indextoname</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAH"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, RFC 3493.
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<P>
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This function first appeared in BSDi.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+getifaddrs">getifaddrs</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+if_nameindex">if_nameindex</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?8+ifconfig">ifconfig</A></B>(8)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="3"><A HREF="#lbAB">NAME</A><DD>
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<DT id="4"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="5"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="6"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="7"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="8"><A HREF="#lbAG">ATTRIBUTES</A><DD>
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<DT id="9"><A HREF="#lbAH">CONFORMING TO</A><DD>
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<DT id="10"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="11"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:46 GMT, March 31, 2021
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</BODY>
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</HTML>
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