218 lines
4.9 KiB
HTML
218 lines
4.9 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 ETHER_ATON</TITLE>
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</HEAD><BODY>
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<H1>ETHER_ATON</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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ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line,
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ether_ntoa_r, ether_aton_r - Ethernet address manipulation routines
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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/netinet/ether.h">netinet/ether.h</A>></B>
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<B>char *ether_ntoa(const struct ether_addr *</B><I>addr</I><B>);</B>
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<B>struct ether_addr *ether_aton(const char *</B><I>asc</I><B>);</B>
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<B>int ether_ntohost(char *</B><I>hostname</I><B>, const struct ether_addr *</B><I>addr</I><B>);</B>
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<B>int ether_hostton(const char *</B><I>hostname</I><B>, struct ether_addr *</B><I>addr</I><B>);</B>
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<B>int ether_line(const char *</B><I>line</I><B>, struct ether_addr *</B><I>addr</I><B>,</B>
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<B> char *</B><I>hostname</I><B>);</B>
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/* GNU extensions */
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<BR>
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<B>char *ether_ntoa_r(const struct ether_addr *</B><I>addr</I><B>, char *</B><I>buf</I><B>);</B>
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<B>struct ether_addr *ether_aton_r(const char *</B><I>asc</I><B>,</B>
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<B> struct ether_addr *</B><I>addr</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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<B>ether_aton</B>()
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converts the 48-bit Ethernet host address
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<I>asc</I>
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from the standard hex-digits-and-colons notation into binary data in
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network byte order and returns a pointer to it in a statically
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allocated buffer, which subsequent calls will
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overwrite.
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<B>ether_aton</B>()
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returns NULL if the address is invalid.
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<P>
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The
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<B>ether_ntoa</B>()
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function converts the Ethernet host address
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<I>addr</I>
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given in network byte order to a string in standard
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hex-digits-and-colons notation, omitting leading zeros.
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The string is returned in a statically allocated buffer,
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which subsequent calls will overwrite.
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<P>
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The
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<B>ether_ntohost</B>()
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function maps an Ethernet address to the
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corresponding hostname in
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<I>/etc/ethers</I>
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and returns nonzero if it cannot be found.
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<P>
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The
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<B>ether_hostton</B>()
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function maps a hostname to the
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corresponding Ethernet address in
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<I>/etc/ethers</I>
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and returns nonzero if it cannot be found.
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<P>
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The
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<B>ether_line</B>()
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function parses a line in
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<I>/etc/ethers</I>
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format (ethernet address followed by whitespace followed by
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hostname; '#' introduces a comment) and returns an address
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and hostname pair, or nonzero if it cannot be parsed.
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The buffer pointed to by
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<I>hostname</I>
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must be sufficiently long, for example, have the same length as
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<I>line</I>.
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<P>
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The functions
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<B>ether_ntoa_r</B>()
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and
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<B>ether_aton_r</B>()
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are reentrant
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thread-safe versions of
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<B>ether_ntoa</B>()
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and
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<B>ether_aton</B>()
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respectively, and do not use static buffers.
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<P>
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The structure
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<I>ether_addr</I>
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is defined in
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<I><<A HREF="file:///usr/include/net/ethernet.h">net/ethernet.h</A>></I>
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as:
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<P>
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struct ether_addr {
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<BR> uint8_t ether_addr_octet[6];
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}
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<A NAME="lbAE"> </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>ether_aton</B>(),
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<B>ether_ntoa</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>ether_ntohost</B>(),
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<B>ether_hostton</B>(),
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<B>ether_line</B>(),
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<B>ether_ntoa_r</B>(),
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<B>ether_aton_r</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="lbAF"> </A>
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<H2>CONFORMING TO</H2>
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4.3BSD, SunOS.
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<A NAME="lbAG"> </A>
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<H2>BUGS</H2>
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In glibc 2.2.5 and earlier, the implementation of
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<B>ether_line</B>()
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is broken.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?5+ethers">ethers</A></B>(5)
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<A NAME="lbAI"> </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="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">ATTRIBUTES</A><DD>
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<DT id="5"><A HREF="#lbAF">CONFORMING TO</A><DD>
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<DT id="6"><A HREF="#lbAG">BUGS</A><DD>
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<DT id="7"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="8"><A HREF="#lbAI">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: 00:05:39 GMT, March 31, 2021
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</BODY>
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</HTML>
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