60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
/*
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* \brief Make dataspace accessible to other Linux processes
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* \author Norman Feske
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* \date 2006-07-03
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*/
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/*
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* Copyright (C) 2006-2011 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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/* glibc includes */
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#include <fcntl.h>
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/* Genode includes */
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#include <base/snprintf.h>
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/* local includes */
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#include "ram_session_component.h"
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/* Linux syscall bindings */
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#include <linux_syscalls.h>
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#include <linux_rpath.h>
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using namespace Genode;
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static int ram_ds_cnt = 0; /* counter for creating unique dataspace IDs */
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void Ram_session_component::_export_ram_ds(Dataspace_component *ds)
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{
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char fname_buf[Linux_dataspace::FNAME_LEN];
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/* assign filename to dataspace */
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snprintf(fname_buf, sizeof(fname_buf), "%s/ds-%d", lx_rpath(), ram_ds_cnt++);
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ds->fname(fname_buf);
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/* create new file representing the dataspace */
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lx_unlink(fname_buf);
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int fd = lx_open(fname_buf, O_CREAT | O_RDWR | O_TRUNC | LX_O_CLOEXEC, S_IRWXU);
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lx_ftruncate(fd, ds->size());
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lx_close(fd);
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}
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void Ram_session_component::_revoke_ram_ds(Dataspace_component *ds)
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{
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lx_unlink(ds->fname().buf);
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}
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void Ram_session_component::_clear_ds(Dataspace_component *ds)
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{
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memset((void *)ds->phys_addr(), 0, ds->size());
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}
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