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<!-- Copyright (C) 2003 Red Hat, Inc. --><!-- This material may be distributed only subject to the terms --><!-- and conditions set forth in the Open Publication License, v1.0 --><!-- or later (the latest version is presently available at --><!-- http://www.opencontent.org/openpub/). --><!-- Distribution of the work or derivative of the work in any --><!-- standard (paper) book form is prohibited unless prior --><!-- permission is obtained from the copyright holder. --><HTML><HEAD><TITLE>link_addr</TITLE><meta name="MSSmartTagsPreventParsing" content="TRUE"><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="eCos Reference Manual"HREF="ecos-ref.html"><LINKREL="UP"TITLE="TCP/IP Library Reference"HREF="tcpip-library-reference.html"><LINKREL="PREVIOUS"TITLE="iso_addr"HREF="net-common-tcpip-manpages-iso-addr.html"><LINKREL="NEXT"TITLE="net_addrcmp"HREF="net-common-tcpip-manpages-net-addrcmp.html"></HEAD><BODYCLASS="SECT1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">eCos Reference Manual</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-iso-addr.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 38. TCP/IP Library Reference</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="net-common-tcpip-manpages-net-addrcmp.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="NET-COMMON-TCPIP-MANPAGES-LINK-ADDR">link_addr</H1><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">LINK_ADDR(3) System Library Functions Manual LINK_ADDR(3)NAME link_addr, link_ntoa - elementary address specification routines for link level accessSYNOPSIS #include <sys/types.h> #include <sys/socket.h> #include <net/if_dl.h> void link_addr(const char *addr, struct sockaddr_dl *sdl); char * link_ntoa(const struct sockaddr_dl *sdl);DESCRIPTION The link_addr() function interprets character strings representing link- level addresses, returning binary information suitable for use in system calls. link_ntoa() takes a link-level address and returns an ASCII string representing some of the information present, including the link level address itself, and the interface name or number, if present. This facility is experimental and is still subject to change. For link_addr(), the string addr may contain an optional network inter- face identifier of the form ``name unit-number'', suitable for the first argument to ifconfig(8), followed in all cases by a colon and an inter- face address in the form of groups of hexadecimal digits separated by periods. Each group represents a byte of address; address bytes are filled left to right from low order bytes through high order bytes. Thus le0:8.0.9.13.d.30 represents an Ethernet address to be transmitted on the first Lance Ethernet interface.RETURN VALUES link_ntoa() always returns a null-terminated string. link_addr() has no return value. (See BUGS.)SEE ALSO iso(4), ifconfig(8)HISTORY The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.BUGS The returned values for link_ntoa reside in a static memory area. The function link_addr() should diagnose improperly formed input, and there should be an unambiguous way to recognize this. If the sdl_len field of the link socket address sdl is 0, link_ntoa() will not insert a colon before the interface address bytes. If this translated address is given to link_addr() without inserting an initial colon, the latter will not interpret it correctly.BSD July 28, 1993 BSD </PRE></TD></TR></TABLE></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="net-common-tcpip-manpages-iso-addr.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="ecos-ref.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="net-common-tcpip-manpages-net-addrcmp.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">iso_addr</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="tcpip-library-reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">net_addrcmp</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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