166 lines
3.8 KiB
C++
166 lines
3.8 KiB
C++
/*
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* \brief LOG service that prints to a terminal
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* \author Stefan Kalkowski
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* \date 2012-05-21
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*/
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/*
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* Copyright (C) 2012-2013 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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#include <base/env.h>
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#include <base/rpc_server.h>
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#include <base/sleep.h>
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#include <root/component.h>
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#include <util/string.h>
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#include <terminal_session/connection.h>
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#include <cap_session/connection.h>
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#include <log_session/log_session.h>
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namespace Genode {
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class Termlog_component : public Rpc_object<Log_session>
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{
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public:
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enum { LABEL_LEN = 64 };
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private:
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char _label[LABEL_LEN];
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Terminal::Connection *_terminal;
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public:
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/**
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* Constructor
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*/
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Termlog_component(const char *label, Terminal::Connection *terminal)
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: _terminal(terminal) { snprintf(_label, LABEL_LEN, "[%s] ", label); }
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/*****************
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** Log session **
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*****************/
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/**
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* Write a log-message to the terminal.
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*
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* The following function's code is a modified variant of the one in:
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* 'base/src/core/include/log_session_component.h'
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*/
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size_t write(String const &string_buf)
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{
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if (!(string_buf.is_valid_string())) {
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PERR("corrupted string");
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return 0;
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}
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char const *string = string_buf.string();
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int len = strlen(string);
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/*
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* Heuristic: The Log console implementation flushes
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* the output preferably in front of escape
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* sequences. If the line contains only
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* the escape sequence, we skip the printing
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* of the label and cut the line break (last
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* character).
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*/
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enum { ESC = 27 };
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if ((string[0] == ESC) && (len == 5) && (string[4] == '\n')) {
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_terminal->write(string, len - 1);
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return len;
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}
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_terminal->write(_label, strlen(_label));
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_terminal->write(string, len);
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/* if last character of string was not a line break, add one */
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if ((len > 0) && (string[len - 1] != '\n'))
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_terminal->write("\n", 1);
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return len;
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}
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};
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class Termlog_root : public Root_component<Termlog_component>
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{
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private:
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Terminal::Connection *_terminal;
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protected:
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/**
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* Root component interface
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*/
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Termlog_component *_create_session(const char *args)
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{
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size_t ram_quota =
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Arg_string::find_arg(args, "ram_quota" ).ulong_value(0);
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/* delete ram quota by the memory needed for the session */
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size_t session_size = max((size_t)4096, sizeof(Termlog_component));
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if (ram_quota < session_size)
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throw Root::Quota_exceeded();
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char label_buf[Termlog_component::LABEL_LEN];
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Arg label_arg = Arg_string::find_arg(args, "label");
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label_arg.string(label_buf, sizeof(label_buf), "");
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return new (md_alloc()) Termlog_component(label_buf, _terminal);
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}
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public:
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/**
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* Constructor
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*
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* \param session_ep entry point for managing cpu session objects
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* \param md_alloc meta-data allocator to be used by root component
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*/
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Termlog_root(Rpc_entrypoint *session_ep, Allocator *md_alloc,
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Terminal::Connection *terminal)
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: Root_component<Termlog_component>(session_ep, md_alloc),
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_terminal(terminal) { }
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};
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}
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int main(int argc, char **argv)
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{
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using namespace Genode;
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/*
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* Open Terminal session
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*/
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static Terminal::Connection terminal;
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/*
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* Initialize server entry point
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*/
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enum { STACK_SIZE = 4096 };
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static Cap_connection cap;
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static Rpc_entrypoint ep(&cap, STACK_SIZE, "termlog_ep");
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static Termlog_root termlog_root(&ep, env()->heap(), &terminal);
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/*
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* Announce services
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*/
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env()->parent()->announce(ep.manage(&termlog_root));
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/**
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* Got to sleep forever
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*/
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sleep_forever();
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return 0;
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}
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