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

NAME
     getpeername -- get address of connected peer

SYNOPSIS
     #include <sys/socket.h>

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

DESCRIPTION
     The getpeername() function returns the address of the peer connected to the specified socket.

     The address_len parameter should be initialized to indicate the amount of space pointed to by address.
     On return it contains the actual size of the address returned (in bytes).

     The address is truncated if the buffer provided is too small.

RETURN VALUES
     The getpeername() function returns the value 0 if successful; otherwise the value -1 is returned and
     the global variable errno is set to indicate the error.

ERRORS
     The call succeeds unless:

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

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

     [EINVAL]           socket has been shut down.

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

     [ENOTCONN]         Either the socket is not connected or it has not had the peer pre-specified.

     [ENOTSOCK]         The argument socket refers to something other than a socket (e.g., a file).

     [EOPNOTSUPP]       getpeername() is not supported for the protocol in use by socket.

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

HISTORY
     The getpeername() function call appeared in 4.2BSD.

4.2 Berkeley Distribution        June 4, 1993        4.2 Berkeley Distribution