SYNOPSIS
       #include <sys/socket.h>

       int getpeername(int socket, struct sockaddr *restrict address,
              socklen_t *restrict address_len);


DESCRIPTION
       The getpeername() function shall retrieve the peer address of the spec-
       ified 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.
       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 .