de69ee2e66
This patch simplifies the system call bindings. The common syscall bindings in 'src/platform/' have been reduced to the syscalls needed by non-core programs. The additional syscalls that are needed solely by core have been moved to 'src/core/include/core_linux_syscalls.h'. Furthermore, the resource path is not used outside of core anymore. Hence, we could get rid of the rpath library. The resource-path code has been moved to 'src/core/include/resource_path.h'. The IPC-related parts of 'src/platform' have been moved to the IPC library. So there is now a clean separation between low-level syscall bindings (in 'src/platform') and higher-level code. The code for the socket-descriptor registry is now located in the 'src/base/ipc/socket_descriptor_registry.h' header. The interface is separated from 'ipc.cc' because core needs to access the registry from outside the ipc library.
68 lines
1.7 KiB
C++
68 lines
1.7 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) 2006-2012 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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/* 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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#include <resource_path.h>
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/* Linux syscall bindings */
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#include <core_linux_syscalls.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[Linux_dataspace::FNAME_LEN];
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/* create file using a unique file name in the resource path */
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snprintf(fname, sizeof(fname), "%s/ds-%d", resource_path(), ram_ds_cnt++);
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lx_unlink(fname);
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int const fd = lx_open(fname, O_CREAT|O_RDWR|O_TRUNC|LX_O_CLOEXEC, S_IRWXU);
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lx_ftruncate(fd, ds->size());
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/* remember file descriptor in dataspace component object */
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ds->fd(fd);
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/*
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* Wipe the file from the Linux file system. The kernel will still keep the
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* then unnamed file around until the last reference to the file will be
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* gone (i.e., an open file descriptor referring to the file). A process
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* w/o the right file descriptor won't be able to open and access the file.
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*/
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lx_unlink(fname);
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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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int const fd = ds->fd().dst().socket;
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if (fd != -1)
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lx_close(fd);
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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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