77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/*
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* \brief Linux-specific core implementation of the ROM session interface
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* \author Norman Feske
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* \date 2006-07-06
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*
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* The Linux version of ROM session component does not use the
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* Rom_fs as provided as constructor argument. Instead, we map
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* rom modules directly to files of the host file system.
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*/
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/*
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* Copyright (C) 2006-2012 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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/* Linux includes */
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#include <linux_syscalls.h>
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/* Genode includes */
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#include <linux_dataspace/linux_dataspace.h>
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#include <util/arg_string.h>
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#include <root/root.h>
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/* local includes */
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#include "rom_session_component.h"
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using namespace Genode;
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static Genode::size_t file_size(const char *path)
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{
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struct stat64 s;
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if (lx_stat(path, &s) < 0)
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return 0;
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else
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return s.st_size;
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}
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Rom_session_component::Rom_session_component(Rom_fs *rom_fs,
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Rpc_entrypoint *ds_ep,
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const char *args)
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: _ds_ep(ds_ep)
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{
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/* extract filename from session arguments */
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char fname_buf[Linux_dataspace::FNAME_LEN];
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Arg_string::find_arg(args, "filename").string(fname_buf, sizeof(fname_buf), "");
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/* only files inside the current working directory are allowed */
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for (const char *c = fname_buf; *c; c++)
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if (*c == '/')
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throw Root::Invalid_args();
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Genode::size_t fsize = file_size(fname_buf);
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/* use invalid capability as default value */
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_ds_cap = Rom_dataspace_capability();
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/* ROM module not found */
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if (fsize == 0)
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throw Root::Invalid_args();
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_ds = Dataspace_component(fsize, 0, false);
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_ds.fname(fname_buf);
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Dataspace_capability ds_cap = _ds_ep->manage(&_ds);
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_ds_cap = static_cap_cast<Rom_dataspace>(ds_cap);
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}
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Rom_session_component::~Rom_session_component()
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{
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_ds_ep->dissolve(&_ds);
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}
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