int getpeername(int socket, struct sockaddr *restrictaddress,
socklen_t *restrictaddress_len);
DESCRIPTION
The getpeername() function shall retrieve the peer address 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 protocol permits connections by unbound clients, and the peer
is not bound, then the value stored in the object pointed
to by address is unspecified.
RETURN VALUE
Upon successful completion, 0 shall be returned. Otherwise, -1 shall
be returned and errno set to indicate the error.
ERRORS
The getpeername() function shall fail if:
EBADF
The socket argument is not a valid file descriptor.
EINVAL
The socket has been shut down.
ENOTCONN
The socket is not connected or otherwise has not had the peer pre-specified.
ENOTSOCK
The socket argument does not refer to a socket.
EOPNOTSUPP
The operation is not supported for the socket protocol.
The getpeername() function may fail if:
ENOBUFS
Insufficient resources were available in the system to complete the
call.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
accept() , bind() , getsockname() , socket()
, the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/socket.h>
COPYRIGHT
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
http://www.opengroup.org/unix/online.html .
