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The new 'Terminal_session::size_changed_sigh' RPC function registers a signal handler that is triggered each time when the terminal size changes. It enables the client to adjust itself to the new size by subsequently calling the 'size' RPC function. Of all terminal servers, only the graphical terminal triggers this signal.
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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enum { 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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