4d442bca30
This patch reduces the number of exception types by facilitating globally defined exceptions for common usage patterns shared by most services. In particular, RPC functions that demand a session-resource upgrade not longer reflect this condition via a session-specific exception but via the 'Out_of_ram' or 'Out_of_caps' types. Furthermore, the 'Parent::Service_denied', 'Parent::Unavailable', 'Root::Invalid_args', 'Root::Unavailable', 'Service::Invalid_args', 'Service::Unavailable', and 'Local_service::Factory::Denied' types have been replaced by the single 'Service_denied' exception type defined in 'session/session.h'. This consolidation eases the error handling (there are fewer exceptions to handle), alleviates the need to convert exceptions along the session-creation call chain, and avoids possible aliasing problems (catching the wrong type with the same name but living in a different scope).
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
/*
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* \brief Linux-specific core implementation of the dataspace component
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* \author Stefan Kalkowski
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* \date 2015-09-25
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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) 2015-2017 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 Affero General Public License version 3.
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*/
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/* Linux includes */
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#include <core_linux_syscalls.h>
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#include <sys/fcntl.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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#include <base/session_label.h>
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/* local includes */
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#include "dataspace_component.h"
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using namespace Genode;
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Linux_dataspace::Filename Dataspace_component::_file_name(const char *args)
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{
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Session_label const label = label_from_args(args);
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Linux_dataspace::Filename fname;
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strncpy(fname.buf, label.last_element().string(), 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 == '/') throw Service_denied();
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return fname;
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}
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Genode::size_t Dataspace_component::_file_size()
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{
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struct stat64 s;
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if (lx_stat(_fname.buf, &s) < 0) throw Service_denied();
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return s.st_size;
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}
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Dataspace_component::Dataspace_component(const char *args)
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: _fname(_file_name(args)),
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_size(_file_size()),
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_addr(0),
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_fd(lx_open(_fname.buf, O_RDONLY | LX_O_CLOEXEC, S_IRUSR | S_IXUSR)),
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_writable(false),
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_owner(0) { }
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