URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [net-common-tcpip-manpages-if-nametoindex.html] - Rev 593
Go to most recent revision | Compare with Previous | Blame | View Log
<!-- 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"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="TCP/IP Library Reference" HREF="tcpip-library-reference.html"><LINK REL="PREVIOUS" TITLE="getservent" HREF="net-common-tcpip-manpages-getservent.html"><LINK REL="NEXT" TITLE="inet" HREF="net-common-tcpip-manpages-inet.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="net-common-tcpip-manpages-getservent.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 38. TCP/IP Library Reference</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="net-common-tcpip-manpages-inet.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="NET-COMMON-TCPIP-MANPAGES-IF-NAMETOINDEX">if_nametoindex</H1 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="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 versa SYNOPSIS #include <net/if.h> 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 <net/if.h> 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 <net/if.h>, 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 ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="net-common-tcpip-manpages-getservent.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="net-common-tcpip-manpages-inet.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >getservent</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="tcpip-library-reference.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >inet</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
Go to most recent revision | Compare with Previous | Blame | View Log