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>Chapter 38. TCP/IP Library Reference</TD
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>GETSOCKNAME(2)                System Calls Manual               GETSOCKNAME(2)
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NAME
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     getsockname - get socket name
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SYNOPSIS
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     #include &lt;sys/types.h&#62;
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     #include &lt;sys/socket.h&#62;
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     int
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     getsockname(int s, struct sockaddr *name, socklen_t *namelen);
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DESCRIPTION
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     getsockname() returns the locally bound address information for a speci-
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     fied socket.
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     Common uses of this function are as follows:
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     o   When bind(2) is called with a port number of 0 (indicating the kernel
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         should pick an ephemeral port) getsockname() is used to retrieve the
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         kernel-assigned port number.
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     o   When a process calls bind(2) on a wildcard IP address, getsockname()
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         is used to retrieve the local IP address for the connection.
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     o   When a function wishes to know the address family of a socket,
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         getsockname() can be used.
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     getsockname() takes three parameters:
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     s, Contains the file desriptor for the socket to be looked up.
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     name points to a sockaddr structure which will hold the resulting address
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     information.  Normal use requires one to use a structure specific to the
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     protocol family in use, such as sockaddr_in (IPv4) or sockaddr_in6
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     (IPv6), cast to a (struct sockaddr *).
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     For greater portability (such as newer protocol families) the new struc-
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     ture sockaddr_storage exists.  sockaddr_storage is large enough to hold
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     any of the other sockaddr_* variants.  On return, it should be cast to
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     the correct sockaddr type, according to the current protocol family.
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     namelen Indicates the amount of space pointed to by name, in bytes.  Upon
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     return, namelen is set to the actual size of the returned address infor-
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     mation.
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     If the address of the destination socket for a given socket connection is
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     needed, the getpeername(2) function should be used instead.
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     If name does not point to enough space to hold the entire socket address,
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     the result will be truncated to namelen bytes.
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RETURN VALUES
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     On success, getsockname() returns a 0, and namelen is set to the actual
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     size of the socket address returned in name.  Otherwise, errno is set,
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     and a value of -1 is returned.
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ERRORS
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     If getsockname() fails, errno is set to one of the following:
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     [EBADF]            The argument s is not a valid descriptor.
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     [ENOTSOCK]         The argument s is a file, not a socket.
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     [ENOBUFS]          Insufficient resources were available in the system to
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                        perform the operation.
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     [EFAULT]           The name parameter points to memory not in a valid
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                        part of the process address space.
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SEE ALSO
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     accept(2), bind(2), getpeername(2), getpeereid(2), socket(2)
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BUGS
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     Names bound to sockets in the UNIX domain are inaccessible; getsockname
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     returns a zero length name.
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HISTORY
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     The getsockname() function call appeared in 4.2BSD.
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BSD                              July 17, 1999                             BSD
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