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+NAME="NET-COMMON-TCPIP-MANPAGES-GETSOCKNAME">getsockname</H1
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+>GETSOCKNAME(2) System Calls Manual GETSOCKNAME(2)
+
+NAME
+ getsockname - get socket name
+
+SYNOPSIS
+ #include <sys/types.h>
+ #include <sys/socket.h>
+
+ 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
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