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vfs: LOG file system

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Norman Feske 2014-04-12 00:05:57 +02:00 committed by Christian Helmuth
parent c3c6a82d13
commit 83a03df6a4
1 changed files with 68 additions and 0 deletions
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os/include/vfs/log_file_system.h Normal file
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/*
* \brief LOG file system
* \author Norman Feske
* \date 2014-04-11
*/
/*
* Copyright (C) 2014 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.
*/
#ifndef _INCLUDE__VFS__LOG_FILE_SYSTEM_H_
#define _INCLUDE__VFS__LOG_FILE_SYSTEM_H_
#include <log_session/connection.h>
#include <vfs/single_file_system.h>
namespace Vfs { class Log_file_system; }
class Vfs::Log_file_system : public Single_file_system
{
private:
Genode::Log_connection _log;
public:
Log_file_system(Xml_node config)
:
Single_file_system(NODE_TYPE_CHAR_DEVICE, name(), config)
{ }
static const char *name() { return "log"; }
/********************************
** File I/O service interface **
********************************/
Write_result write(Vfs_handle *, char const *src, size_t count, size_t &out_count) override
{
out_count = count;
/* count does not include the trailing '\0' */
while (count > 0) {
char tmp[128];
int const curr_count = min(count, sizeof(tmp) - 1);
strncpy(tmp, src, curr_count);
tmp[curr_count > 0 ? curr_count : 0] = 0;
_log.write(tmp);
count -= curr_count;
src += curr_count;
}
return WRITE_OK;
}
Read_result read(Vfs_handle *, char *dst, size_t count, size_t &out_count) override
{
out_count = 0;
return READ_OK;
}
};
#endif /* _INCLUDE__VFS__LOG_FILE_SYSTEM_H_ */