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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>getsockname</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="getpeername"HREF="net-common-tcpip-manpages-getpeername.html"><LINKREL="NEXT"TITLE="getsockopt"HREF="net-common-tcpip-manpages-getsockopt.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-getpeername.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-getsockopt.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="NET-COMMON-TCPIP-MANPAGES-GETSOCKNAME">getsockname</H1><TABLEBORDER="5"BGCOLOR="#E0E0F0"WIDTH="70%"><TR><TD><PRECLASS="SCREEN">GETSOCKNAME(2)                System Calls Manual               GETSOCKNAME(2)NAME     getsockname - get socket nameSYNOPSIS     #include &lt;sys/types.h&#62;     #include &lt;sys/socket.h&#62;     int     getsockname(int s, struct sockaddr *name, socklen_t *namelen);DESCRIPTION     getsockname() returns the locally bound address information for a speci-     fied socket.     Common uses of this function are as follows:     o   When bind(2) is called with a port number of 0 (indicating the kernel         should pick an ephemeral port) getsockname() is used to retrieve the         kernel-assigned port number.     o   When a process calls bind(2) on a wildcard IP address, getsockname()         is used to retrieve the local IP address for the connection.     o   When a function wishes to know the address family of a socket,         getsockname() can be used.     getsockname() takes three parameters:     s, Contains the file desriptor for the socket to be looked up.     name points to a sockaddr structure which will hold the resulting address     information.  Normal use requires one to use a structure specific to the     protocol family in use, such as sockaddr_in (IPv4) or sockaddr_in6     (IPv6), cast to a (struct sockaddr *).     For greater portability (such as newer protocol families) the new struc-     ture sockaddr_storage exists.  sockaddr_storage is large enough to hold     any of the other sockaddr_* variants.  On return, it should be cast to     the correct sockaddr type, according to the current protocol family.     namelen Indicates the amount of space pointed to by name, in bytes.  Upon     return, namelen is set to the actual size of the returned address infor-     mation.     If the address of the destination socket for a given socket connection is     needed, the getpeername(2) function should be used instead.     If name does not point to enough space to hold the entire socket address,     the result will be truncated to namelen bytes.RETURN VALUES     On success, getsockname() returns a 0, and namelen is set to the actual     size of the socket address returned in name.  Otherwise, errno is set,     and a value of -1 is returned.ERRORS     If getsockname() fails, errno is set to one of the following:     [EBADF]            The argument s is not a valid descriptor.     [ENOTSOCK]         The argument s is a file, not a socket.     [ENOBUFS]          Insufficient resources were available in the system to                        perform the operation.     [EFAULT]           The name parameter points to memory not in a valid                        part of the process address space.SEE ALSO     accept(2), bind(2), getpeername(2), getpeereid(2), socket(2)BUGS     Names bound to sockets in the UNIX domain are inaccessible; getsockname     returns a zero length name.HISTORY     The getsockname() function call appeared in 4.2BSD.BSD                              July 17, 1999                             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-getpeername.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-getsockopt.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">getpeername</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="tcpip-library-reference.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">getsockopt</TD></TR></TABLE></DIV></BODY></HTML>
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