genode/repos/base/src/base/console/log_console.cc
Norman Feske ca971bbfd8 Move repositories to 'repos/' subdirectory
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.

Issue #1082
2014-05-14 16:08:00 +02:00

151 lines
3.0 KiB
C++

/*
* \brief Printf backend for the LOG interface
* \author Norman Feske
* \date 2006-09-15
*/
/*
* Copyright (C) 2006-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#include <log_session/connection.h>
#include <base/printf.h>
#include <base/console.h>
#include <base/lock.h>
#include <base/env.h>
using namespace Genode;
void *operator new (size_t, void *ptr) { return ptr; }
class Log_console : public Console
{
private:
enum { _BUF_SIZE = 216 };
Log_connection _log;
char _buf[_BUF_SIZE];
unsigned _num_chars;
Lock _lock;
void _flush()
{
/* null-terminate string */
_buf[_num_chars] = 0;
_log.write(_buf);
/* restart with empty buffer */
_num_chars = 0;
}
protected:
void _out_char(char c)
{
/* ensure enough buffer space for complete escape sequence */
if ((c == 27) && (_num_chars + 8 > _BUF_SIZE)) _flush();
_buf[_num_chars++] = c;
/* flush immediately on line break */
if (c == '\n' || _num_chars >= sizeof(_buf) - 1)
_flush();
}
public:
/**
* Constructor
*/
Log_console()
:
_num_chars(0)
{ }
/**
* Console interface
*/
void vprintf(const char *format, va_list list)
{
Lock::Guard lock_guard(_lock);
Console::vprintf(format, list);
}
/**
* Return LOG session interface
*/
Log_session *log_session() { return &_log; }
/**
* Re-establish LOG session
*/
void reconnect()
{
/*
* Note that the destructor of old 'Log_connection' is not called.
* This is not needed because the only designated use of this
* function is the startup procedure of noux processes created
* via fork. At the point of calling this function, the new child
* has no valid capability to the original LOG session anyway.
*/
new (&_log) Log_connection;
}
};
/*
* In the presence of a libC, we use the libC's full printf implementation and
* use the 'Log_console' as backend.
*/
Log_console *stdout_log_console()
{
/*
* Construct the log console object on the first call of this function.
* In constrast to having a static variable in the global scope, the
* constructor gets only called when needed and no static constructor
* gets invoked by the initialization code.
*/
static Log_console static_log_console;
return &static_log_console;
}
/**
* Hook for supporting libc back ends for stdio
*/
extern "C" int stdout_write(const char *s)
{
return stdout_log_console()->log_session()->write(s);
}
/**
* Hook for support the 'fork' implementation of the noux libc backend
*/
extern "C" void stdout_reconnect() { stdout_log_console()->reconnect(); }
void Genode::printf(const char *format, ...)
{
va_list list;
va_start(list, format);
vprintf(format, list);
va_end(list);
}
void Genode::vprintf(const char *format, va_list list)
{
stdout_log_console()->vprintf(format, list);
}