getsockname - Gets the socket name
struct sockaddr *address,
socklen_t *address_len );
[XNS4.0] The definition of the getsockname() function in XNS4.0 uses a
size_t data type instead of a socklen_t data type as specified in XNS5.0
(the previous definition).
[Tru64 UNIX] The following definition of the getsockname() function does
not conform to current standards and is supported only for backward compa-
tibility (see standards(5)):
struct sockaddr *address,
int *address_len );
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about indus-
try standards and associated tags.
socket Specifies the socket file descriptor for which the local address
address Points to a sockaddr structure, the format of which is determined
by the domain and by the behavior requested for the socket. The
sockaddr structure is an overlay for a sockaddr_in, sockaddr_un,
sockaddr_in6, or sockaddr_storage structure, depending on which
of the supported address families is active.
[Tru64 UNIX] If the compile-time option _SOCKADDR_LEN is
defined before the sys/socket.h header file is included, the
sockaddr structure takes 4.4BSD behavior, with a field for speci-
fying the length of the socket address. Otherwise, the default
4.3BSD sockaddr structure is used, with the length of the socket
address assumed to be 14 bytes or less.
If _SOCKADDR_LEN is defined, the 4.3BSD sockaddr structure is
defined with the name osockaddr.
Specifies the length of the sockaddr structure pointed to by the
The getsockname() function retrieves the locally bound address of the
If the actual length of the address is greater than the length of the
sockaddr structure, the address is truncated.
If the socket is not bound to a local name, the value pointed to by address
A process created by another process can inherit open sockets. To use the
inherited sockets, the created process may need to identify its address.
The getsockname() function allows a process to retrieve the local address
bound to the specified socket.
A process can use the getpeername() function to determine the address of a
destination socket in a socket connection.
[Tru64 UNIX] When compiled in the X/Open UNIX environment or the POSIX.1g
socket environment, calls to the getsockname() function are internally
renamed by prepending _E to the function name. When you are debugging a
module that includes the getsockname() function and for which
_XOPEN_SOURCE_EXTENDED or _POSIX_PII_SOCKET has been defined, use _Eget-
sockname to refer to the getsockname() call. See standards(5) for further
Upon successful completion, a value of 0 (zero) is returned, and the
address_len parameter points to the size of the socket address. Otherwise,
a value of -1 is returned and errno is set to indicate the error.
If the getsockname() function fails, errno may be set to one of the follow-
[EBADF] The socket parameter is not valid.
[EFAULT] The address or address_len parameter is not in a readable or
writable part of the user address space.
[EINVAL] The socket is shut down.
[ENOBUFS] Insufficient resources are available in the system to complete
[ENOSR] The available STREAMS resources were insufficient for the opera-
tion to complete.
The socket parameter refers to a file, not a socket.
The operation is not supported for this socket's protocol.
Functions: accept(2), bind(2), getpeername(2), socket(2).