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121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
/*
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* \brief Terminal session interface
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* \author Norman Feske
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* \date 2011-08-11
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__TERMINAL_SESSION__TERMINAL_SESSION_H_
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#define _INCLUDE__TERMINAL_SESSION__TERMINAL_SESSION_H_
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/* Genode includes */
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#include <session/session.h>
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#include <base/rpc.h>
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#include <dataspace/capability.h>
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namespace Terminal { struct Session; }
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struct Terminal::Session : Genode::Session
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{
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/**
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* \noapi
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*/
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static const char *service_name() { return "Terminal"; }
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/*
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* A terminal session consumes a dataspace capability for the server's
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* session-object allocation, its session capability, and a dataspace
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* capability for the communication buffer.
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*/
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static constexpr unsigned CAP_QUOTA = 3;
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class Size
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{
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private:
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unsigned _columns, _lines;
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public:
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Size() : _columns(0), _lines(0) { }
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Size(unsigned columns, unsigned lines)
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: _columns(columns), _lines(lines) { }
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unsigned columns() const { return _columns; }
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unsigned lines() const { return _lines; }
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};
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/**
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* Return terminal size
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*/
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virtual Size size() = 0;
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/**
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* Return true of one or more characters are available for reading
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*/
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virtual bool avail() = 0;
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/**
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* Read characters from terminal
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*/
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virtual Genode::size_t read(void *buf, Genode::size_t buf_size) = 0;
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/**
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* Write characters to terminal
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*/
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virtual Genode::size_t write(void const *buf, Genode::size_t num_bytes) = 0;
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/**
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* Register signal handler to be informed about the established connection
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*
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* This method is used for a simple startup protocol of terminal
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* sessions. At session-creation time, the terminal session may not
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* be ready to use. For example, a TCP terminal session needs an
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* established TCP connection first. However, we do not want to let the
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* session-creation block on the server side because this would render
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* the servers entrypoint unavailable for all other clients until the
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* TCP connection is ready. Instead, we deliver a 'connected' signal
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* to the client emitted when the session becomes ready to use. The
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* Terminal::Connection waits for this signal at construction time.
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*/
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virtual void connected_sigh(Genode::Signal_context_capability cap) = 0;
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/**
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* Register signal handler to be informed about ready-to-read characters
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*/
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virtual void read_avail_sigh(Genode::Signal_context_capability cap) = 0;
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/**
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* Register signal handler to be notified on terminal-size changes
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*/
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virtual void size_changed_sigh(Genode::Signal_context_capability cap) = 0;
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/*******************
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** RPC interface **
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*******************/
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GENODE_RPC(Rpc_size, Size, size);
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GENODE_RPC(Rpc_avail, bool, avail);
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GENODE_RPC(Rpc_read, Genode::size_t, _read, Genode::size_t);
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GENODE_RPC(Rpc_write, Genode::size_t, _write, Genode::size_t);
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GENODE_RPC(Rpc_connected_sigh, void, connected_sigh, Genode::Signal_context_capability);
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GENODE_RPC(Rpc_read_avail_sigh, void, read_avail_sigh, Genode::Signal_context_capability);
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GENODE_RPC(Rpc_size_changed_sigh, void, size_changed_sigh, Genode::Signal_context_capability);
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GENODE_RPC(Rpc_dataspace, Genode::Dataspace_capability, _dataspace);
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GENODE_RPC_INTERFACE(Rpc_size, Rpc_avail, Rpc_read, Rpc_write,
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Rpc_connected_sigh, Rpc_read_avail_sigh,
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Rpc_size_changed_sigh, Rpc_dataspace);
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};
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#endif /* _INCLUDE__TERMINAL_SESSION__TERMINAL_SESSION_H_ */
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