196 lines
3.9 KiB
C++
196 lines
3.9 KiB
C++
/*
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* \brief Terminal that directs output to the LOG interface
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* \author Norman Feske
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* \date 2013-11-08
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*/
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/*
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* Copyright (C) 2013 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 General Public License version 2.
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*/
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/* Genode includes */
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#include <root/component.h>
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#include <os/server.h>
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#include <os/attached_ram_dataspace.h>
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#include <terminal_session/terminal_session.h>
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#include <log_session/log_session.h>
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namespace Terminal {
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class Session_component;
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class Root_component;
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class Main;
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using namespace Genode;
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};
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/**
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* Utility for the buffered output of small successive write operations
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*/
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class Buffered_output
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{
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private:
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enum { SIZE = Genode::Log_session::String::MAX_SIZE };
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typedef Genode::size_t size_t;
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char _buf[SIZE + 1 /* room for null-termination */ ];
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/* index of next character within '_buf' to write */
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unsigned _index = 0;
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void _flush()
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{
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/* append null termination */
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_buf[_index] = 0;
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/* flush buffered characters to LOG */
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Genode::printf(_buf);
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/* reset */
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_index = 0;
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}
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size_t _remaining_capacity() const { return SIZE - _index; }
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public:
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size_t write(char const *src, size_t num_bytes)
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{
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size_t const consume_bytes = Genode::min(num_bytes,
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_remaining_capacity());
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for (unsigned i = 0; i < consume_bytes; i++) {
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char const c = src[i];
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_buf[_index++] = c;
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if (c == '\n')
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_flush();
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}
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if (_remaining_capacity() == 0)
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_flush();
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return consume_bytes;
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}
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};
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/**************
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** Terminal **
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**************/
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class Terminal::Session_component : public Rpc_object<Session, Session_component>
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{
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private:
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/**
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* Buffer shared with the terminal client
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*/
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Attached_ram_dataspace _io_buffer;
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Buffered_output _output;
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public:
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Session_component(size_t io_buffer_size)
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:
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_io_buffer(env()->ram_session(), io_buffer_size)
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{ }
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/********************************
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** Terminal session interface **
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********************************/
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Size size() { return Size(0, 0); }
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bool avail() { return false; }
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size_t _read(size_t dst_len) { return 0; }
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void _write(Genode::size_t num_bytes)
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{
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/* sanitize argument */
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num_bytes = Genode::min(num_bytes, _io_buffer.size());
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char const *src = _io_buffer.local_addr<char>();
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for (size_t written_bytes = 0; written_bytes < num_bytes; )
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written_bytes += _output.write(src + written_bytes,
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num_bytes - written_bytes);
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}
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Dataspace_capability _dataspace() { return _io_buffer.cap(); }
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void read_avail_sigh(Signal_context_capability) { }
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void connected_sigh(Signal_context_capability sigh)
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{
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/*
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* Immediately reflect connection-established signal to the
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* client because the session is ready to use immediately after
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* creation.
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*/
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Signal_transmitter(sigh).submit();
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}
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size_t read(void *buf, size_t) { return 0; }
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size_t write(void const *buf, size_t) { return 0; }
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};
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class Terminal::Root_component : public Genode::Root_component<Session_component>
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{
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protected:
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Session_component *_create_session(const char *args)
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{
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size_t const io_buffer_size = 4096;
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return new (md_alloc()) Session_component(io_buffer_size);
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}
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public:
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Root_component(Server::Entrypoint &ep, Genode::Allocator &md_alloc)
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:
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Genode::Root_component<Session_component>(&ep.rpc_ep(), &md_alloc)
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{ }
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};
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struct Terminal::Main
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{
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Server::Entrypoint &ep;
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Sliced_heap sliced_heap = { env()->ram_session(), env()->rm_session() };
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Root_component terminal_root = { ep, sliced_heap };
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Main(Server::Entrypoint &ep) : ep(ep)
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{
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env()->parent()->announce(ep.manage(terminal_root));
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}
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};
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/************
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** Server **
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************/
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namespace Server {
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char const *name() { return "log_terminal_ep"; }
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size_t stack_size() { return 4*1024*sizeof(long); }
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void construct(Entrypoint &ep)
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{
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static Terminal::Main terminal(ep);
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}
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}
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