int getsockname(int socket, struct sockaddr *restrictaddress,
The getsockname() function shall retrieve the locally-bound
name of the specified socket, store this address in the
sockaddr structure pointed to by the address argument,
and store the length of this address in the object pointed to
by the address_len argument.
If the actual length of the address is greater than the length of
the supplied sockaddr structure, the stored address
shall be truncated.
If the socket has not been bound to a local name, the value stored
in the object pointed to by address is
Upon successful completion, 0 shall be returned, the address
argument shall point to the address of the socket, and the
address_len argument shall point to the length of the address.
Otherwise, -1 shall be returned and errno set to
indicate the error.
The getsockname() function shall fail if:
The socket argument is not a valid file descriptor.
The socket argument does not refer to a socket.
The operation is not supported for this socket's protocol.
The getsockname() function may fail if:
The socket has been shut down.
Insufficient resources were available in the system to complete the
The following sections are informative.
accept() , bind() , getpeername() , socket()
, the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/socket.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at