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Linux 2.6 - man page for getpeername (linux section 3posix)

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GETPEERNAME(P)			    POSIX Programmer's Manual			   GETPEERNAME(P)

NAME
       getpeername - get the name of the peer socket

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 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   GETPEERNAME(P)
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