200 lines
4.2 KiB
C++
200 lines
4.2 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) 2013-2017 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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/* Genode includes */
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#include <base/component.h>
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#include <base/heap.h>
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#include <root/component.h>
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#include <base/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::log(Genode::Cstring(_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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if (c == '\n')
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_flush();
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else
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_buf[_index++] = c;
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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(Ram_allocator &ram,
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Region_map &rm,
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size_t io_buffer_size)
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:
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_io_buffer(ram, rm, 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() override { return Size(0, 0); }
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bool avail() override { return false; }
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size_t _read(size_t) { return 0; }
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size_t _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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size_t written_bytes;
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for (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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return 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) override { }
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void size_changed_sigh(Signal_context_capability) override { }
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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 *, size_t) override { return 0; }
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size_t write(void const *, size_t) override { 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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private:
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Ram_allocator &_ram;
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Region_map &_rm;
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protected:
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Session_component *_create_session(const char *)
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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(_ram, _rm, io_buffer_size);
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}
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public:
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Root_component(Entrypoint &ep,
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Allocator &md_alloc,
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Ram_allocator &ram,
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Region_map &rm)
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:
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Genode::Root_component<Session_component>(&ep.rpc_ep(), &md_alloc),
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_ram(ram), _rm(rm)
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{ }
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};
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struct Terminal::Main
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{
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Env &_env;
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Sliced_heap sliced_heap { _env.ram(), _env.rm() };
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Root_component terminal_root { _env.ep(), sliced_heap,
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_env.ram(), _env.rm() };
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Main(Env &env) : _env(env)
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{
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env.parent().announce(env.ep().manage(terminal_root));
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}
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};
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void Component::construct(Genode::Env &env) { static Terminal::Main main(env); }
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