genode/repos/os/include/vfs/terminal_file_system.h

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/*
* \brief Terminal file system
* \author Christian Prochaska
* \author Norman Feske
* \date 2012-05-23
*/
/*
* Copyright (C) 2012-2014 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__TERMINAL_FILE_SYSTEM_H_
#define _INCLUDE__VFS__TERMINAL_FILE_SYSTEM_H_
#include <terminal_session/connection.h>
#include <vfs/single_file_system.h>
namespace Vfs { class Terminal_file_system; }
class Vfs::Terminal_file_system : public Single_file_system
{
private:
struct Label
{
enum { LABEL_MAX_LEN = 64 };
char string[LABEL_MAX_LEN];
Label(Xml_node config)
{
string[0] = 0;
try { config.attribute("label").value(string, sizeof(string)); }
catch (...) { }
}
} _label;
Terminal::Connection _terminal;
public:
Terminal_file_system(Xml_node config)
:
Single_file_system(NODE_TYPE_CHAR_DEVICE, name(), config),
_label(config),
_terminal(_label.string)
{
/*
* Wait for connection-established signal
*/
/* create signal receiver, just for the single signal */
Genode::Signal_context sig_ctx;
Genode::Signal_receiver sig_rec;
Signal_context_capability sig_cap = sig_rec.manage(&sig_ctx);
/* register signal handler */
_terminal.connected_sigh(sig_cap);
/* wati for signal */
sig_rec.wait_for_signal();
sig_rec.dissolve(&sig_ctx);
}
static const char *name() { return "terminal"; }
/********************************
** File I/O service interface **
********************************/
Write_result write(Vfs_handle *, char const *buf, file_size buf_size,
file_size &out_count) override
{
out_count = _terminal.write(buf, buf_size);
return WRITE_OK;
}
Read_result read(Vfs_handle *, char *dst, file_size count,
file_size &out_count) override
{
out_count = _terminal.read(dst, count);
return READ_OK;
}
Ftruncate_result ftruncate(Vfs_handle *vfs_handle, file_size) override
{
return FTRUNCATE_OK;
}
bool check_unblock(Vfs_handle *vfs_handle, bool rd, bool wr, bool ex) override
{
if (rd && (_terminal.avail() > 0))
return true;
if (wr)
return true;
return false;
}
void register_read_ready_sigh(Vfs_handle *vfs_handle,
Signal_context_capability sigh) override
{
_terminal.read_avail_sigh(sigh);
}
};
#endif /* _INCLUDE__VFS__TERMINAL_FILE_SYSTEM_H_ */