bsd man page for getpeername

GETPEERNAME(2)							System Calls Manual						    GETPEERNAME(2)

NAME
       getpeername - get name of connected peer

SYNOPSIS
       getpeername(s, name, namelen)
       int s;
       struct sockaddr *name;
       int *namelen;

DESCRIPTION
       Getpeername  returns  the  name	of  the peer connected to socket s.  The namelen parameter should be initialized to indicate the amount of
       space pointed to by name.  On return it contains the actual size of the name returned (in bytes).  The name is truncated if the buffer pro-
       vided is too small.

DIAGNOSTICS
       A 0 is returned if the call succeeds, -1 if it fails.

ERRORS
       The call succeeds unless:

       [EBADF]	      The argument s is not a valid descriptor.

       [ENOTSOCK]     The argument s is a file, not a socket.

       [ENOTCONN]     The socket is not connected.

       [ENOBUFS]      Insufficient resources were available in the system to perform the operation.

       [EFAULT]       The name parameter points to memory not in a valid part of the process address space.

SEE ALSO
       accept(2), bind(2), socket(2), getsockname(2)

4.2 Berkeley Distribution					   May 13, 1986 						    GETPEERNAME(2)