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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>if_nametoindex</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="getservent"HREF="net-common-tcpip-manpages-getservent.html"><LINKREL="NEXT"TITLE="inet"HREF="net-common-tcpip-manpages-inet.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-getservent.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-inet.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="NET-COMMON-TCPIP-MANPAGES-IF-NAMETOINDEX">if_nametoindex</H1><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">IF_NAMETOINDEX(3)       System Library Functions Manual      IF_NAMETOINDEX(3)NAME     if_nametoindex, if_indextoname, if_nameindex, if_freenameindex - convert     interface index to name, and vice versaSYNOPSIS     #include &lt;net/if.h&#62;     unsigned int     if_nametoindex(const char *ifname);     char *     if_indextoname(unsigned int ifindex, char *ifname);     struct if_nameindex *     if_nameindex(void);     void     if_freenameindex(struct if_nameindex *ptr);DESCRIPTION     These functions map interface indexes to interface names (such as     ``lo0''), and vice versa.     The if_nametoindex() function converts an interface name specified by the     ifname argument to an interface index (positive integer value).  If the     specified interface does not exist, 0 will be returned.     if_indextoname() converts an interface index specified by the ifindex     argument to an interface name.  The ifname argument must point to a     buffer of at least IF_NAMESIZE bytes into which the interface name corre-     sponding to the specified index is returned.  (IF_NAMESIZE is also     defined in &lt;net/if.h&#62; and its value includes a terminating null byte at     the end of the interface name.)  This pointer is also the return value of     the function.  If there is no interface corresponding to the specified     index, NULL is returned.     if_nameindex() returns an array of if_nameindex structures.     if_nametoindex is also defined in &lt;net/if.h&#62;, and is as follows:     struct if_nameindex {         unsigned int   if_index;  /* 1, 2, ... */         char          *if_name;   /* null terminated name: "le0", ... */     };     The end of the array of structures is indicated by a structure with an     if_index of 0 and an if_name of NULL.  The function returns a null     pointer on error.  The memory used for this array of structures along     with the interface names pointed to by the if_name members is obtained     dynamically.  This memory is freed by the if_freenameindex() function.     if_freenameindex() takes a pointer that was returned by if_nameindex() as     argument (ptr), and it reclaims the region allocated.DIAGNOSTICS     if_nametoindex() returns 0 on error, positive integer on success.     if_indextoname() and if_nameindex() return NULL on errors.SEE ALSO     R. Gilligan, S.  Thomson, J. Bound, and W. Stevens, ``Basic Socket Inter-     face Extensions for IPv6,'' RFC2553, March 1999.STANDARDS     These functions are defined in ``Basic Socket Interface Extensions for     IPv6'' (RFC2533).BSD                              May 21, 1998                              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-getservent.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-inet.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">getservent</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="tcpip-library-reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">inet</TD></TR></TABLE></DIV></BODY></HTML>
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