getpeername man page on 4.4BSD

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GETPEERNAME(2)		    BSD System Calls Manual		GETPEERNAME(2)

     getpeername — get name of connected peer

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

     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 provided is too

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

     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 per‐
		 form the operation.

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

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

     The getpeername function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution

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