Function sys_getpeername 

pub fn sys_getpeername(
    abi: &mut LinuxRiscv64Abi,
    trapframe: &mut Trapframe,
) -> usize

Linux sys_getpeername implementation

Gets the address of the peer connected to the socket.

Arguments:

• arg0: sockfd (socket file descriptor)
• arg1: addr (pointer to socket address structure)
• arg2: addrlen (pointer to size of address structure)

Returns:

• 0 on success
• usize::MAX (Linux -1) indicating failure